Header And Logo
|
#include "postgres.h"#include <limits.h>#include "libpq-fe.h"#include "access/htup_details.h"#include "access/reloptions.h"#include "catalog/indexing.h"#include "catalog/namespace.h"#include "catalog/pg_foreign_server.h"#include "catalog/pg_type.h"#include "catalog/pg_user_mapping.h"#include "executor/spi.h"#include "foreign/foreign.h"#include "funcapi.h"#include "lib/stringinfo.h"#include "mb/pg_wchar.h"#include "miscadmin.h"#include "parser/scansup.h"#include "utils/acl.h"#include "utils/builtins.h"#include "utils/fmgroids.h"#include "utils/guc.h"#include "utils/lsyscache.h"#include "utils/memutils.h"#include "utils/rel.h"#include "utils/tqual.h"#include "dblink.h"
Go to the source code of this file.
Data Structures | |
| struct | remoteConn |
| struct | storeInfo |
| struct | remoteConnHashEnt |
Defines | |
| #define | NUMCONN 16 |
| #define | xpfree(var_) |
| #define | xpstrdup(var_c, var_) |
| #define | DBLINK_RES_INTERNALERROR(p2) |
| #define | DBLINK_CONN_NOT_AVAIL |
| #define | DBLINK_GET_CONN |
| #define | DBLINK_GET_NAMED_CONN |
| #define | DBLINK_INIT |
| #define | DBLINK_NOTIFY_COLS 3 |
Typedefs | |
| typedef struct remoteConn | remoteConn |
| typedef struct storeInfo | storeInfo |
| typedef struct remoteConnHashEnt | remoteConnHashEnt |
Functions | |
| static Datum | dblink_record_internal (FunctionCallInfo fcinfo, bool is_async) |
| static void | prepTuplestoreResult (FunctionCallInfo fcinfo) |
| static void | materializeResult (FunctionCallInfo fcinfo, PGconn *conn, PGresult *res) |
| static void | materializeQueryResult (FunctionCallInfo fcinfo, PGconn *conn, const char *conname, const char *sql, bool fail) |
| static PGresult * | storeQueryResult (storeInfo *sinfo, PGconn *conn, const char *sql) |
| static void | storeRow (storeInfo *sinfo, PGresult *res, bool first) |
| static remoteConn * | getConnectionByName (const char *name) |
| static HTAB * | createConnHash (void) |
| static void | createNewConnection (const char *name, remoteConn *rconn) |
| static void | deleteConnection (const char *name) |
| static char ** | get_pkey_attnames (Relation rel, int16 *numatts) |
| static char ** | get_text_array_contents (ArrayType *array, int *numitems) |
| static char * | get_sql_insert (Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals) |
| static char * | get_sql_delete (Relation rel, int *pkattnums, int pknumatts, char **tgt_pkattvals) |
| static char * | get_sql_update (Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals, char **tgt_pkattvals) |
| static char * | quote_ident_cstr (char *rawstr) |
| static int | get_attnum_pk_pos (int *pkattnums, int pknumatts, int key) |
| static HeapTuple | get_tuple_of_interest (Relation rel, int *pkattnums, int pknumatts, char **src_pkattvals) |
| static Relation | get_rel_from_relname (text *relname_text, LOCKMODE lockmode, AclMode aclmode) |
| static char * | generate_relation_name (Relation rel) |
| static void | dblink_connstr_check (const char *connstr) |
| static void | dblink_security_check (PGconn *conn, remoteConn *rconn) |
| static void | dblink_res_error (const char *conname, PGresult *res, const char *dblink_context_msg, bool fail) |
| static char * | get_connect_string (const char *servername) |
| static char * | escape_param_str (const char *from) |
| static void | validate_pkattnums (Relation rel, int2vector *pkattnums_arg, int32 pknumatts_arg, int **pkattnums, int *pknumatts) |
| static bool | is_valid_dblink_option (const PQconninfoOption *options, const char *option, Oid context) |
| static int | applyRemoteGucs (PGconn *conn) |
| static void | restoreLocalGucs (int nestlevel) |
| PG_FUNCTION_INFO_V1 (dblink_connect) | |
| Datum | dblink_connect (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_disconnect) | |
| Datum | dblink_disconnect (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_open) | |
| Datum | dblink_open (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_close) | |
| Datum | dblink_close (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_fetch) | |
| Datum | dblink_fetch (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_record) | |
| Datum | dblink_record (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_send_query) | |
| Datum | dblink_send_query (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_get_result) | |
| Datum | dblink_get_result (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_get_connections) | |
| Datum | dblink_get_connections (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_is_busy) | |
| Datum | dblink_is_busy (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_cancel_query) | |
| Datum | dblink_cancel_query (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_error_message) | |
| Datum | dblink_error_message (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_exec) | |
| Datum | dblink_exec (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_get_pkey) | |
| Datum | dblink_get_pkey (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_build_sql_insert) | |
| Datum | dblink_build_sql_insert (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_build_sql_delete) | |
| Datum | dblink_build_sql_delete (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_build_sql_update) | |
| Datum | dblink_build_sql_update (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_current_query) | |
| Datum | dblink_current_query (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_get_notify) | |
| Datum | dblink_get_notify (PG_FUNCTION_ARGS) |
| PG_FUNCTION_INFO_V1 (dblink_fdw_validator) | |
| Datum | dblink_fdw_validator (PG_FUNCTION_ARGS) |
Variables | |
| PG_MODULE_MAGIC | |
| static remoteConn * | pconn = NULL |
| static HTAB * | remoteConnHash = NULL |
| #define DBLINK_CONN_NOT_AVAIL |
| #define DBLINK_GET_NAMED_CONN |
do { \ conname = text_to_cstring(PG_GETARG_TEXT_PP(0)); \ rconn = getConnectionByName(conname); \ if (rconn) \ conn = rconn->conn; \ else \ DBLINK_CONN_NOT_AVAIL; \ } while (0)
Definition at line 217 of file dblink.c.
Referenced by dblink_get_notify().
| #define DBLINK_INIT |
do { \ if (!pconn) \ { \ pconn = (remoteConn *) MemoryContextAlloc(TopMemoryContext, sizeof(remoteConn)); \ pconn->conn = NULL; \ pconn->openCursorCount = 0; \ pconn->newXactForCursor = FALSE; \ } \ } while (0)
| #define DBLINK_NOTIFY_COLS 3 |
Definition at line 1870 of file dblink.c.
Referenced by dblink_get_notify().
| #define DBLINK_RES_INTERNALERROR | ( | p2 | ) |
do { \ msg = pstrdup(PQerrorMessage(conn)); \ if (res) \ PQclear(res); \ elog(ERROR, "%s: %s", p2, msg); \ } while (0)
Definition at line 164 of file dblink.c.
Referenced by dblink_close(), and dblink_open().
| #define NUMCONN 16 |
Definition at line 144 of file dblink.c.
Referenced by createConnHash().
| #define xpfree | ( | var_ | ) |
| #define xpstrdup | ( | var_c, | ||
| var_ | ||||
| ) |
Definition at line 156 of file dblink.c.
Referenced by dblink_res_error().
| typedef struct remoteConn remoteConn |
| typedef struct remoteConnHashEnt remoteConnHashEnt |
| static int applyRemoteGucs | ( | PGconn * | conn | ) | [static] |
Definition at line 2938 of file dblink.c.
References Assert, GetConfigOption(), GUC_ACTION_SAVE, i, lengthof, NewGUCNestLevel(), NULL, PGC_S_SESSION, PGC_USERSET, PQparameterStatus(), and set_config_option().
Referenced by materializeResult(), and storeQueryResult().
{
static const char *const GUCsAffectingIO[] = {
"DateStyle",
"IntervalStyle"
};
int nestlevel = -1;
int i;
for (i = 0; i < lengthof(GUCsAffectingIO); i++)
{
const char *gucName = GUCsAffectingIO[i];
const char *remoteVal = PQparameterStatus(conn, gucName);
const char *localVal;
/*
* If the remote server is pre-8.4, it won't have IntervalStyle, but
* that's okay because its output format won't be ambiguous. So just
* skip the GUC if we don't get a value for it. (We might eventually
* need more complicated logic with remote-version checks here.)
*/
if (remoteVal == NULL)
continue;
/*
* Avoid GUC-setting overhead if the remote and local GUCs already
* have the same value.
*/
localVal = GetConfigOption(gucName, false, false);
Assert(localVal != NULL);
if (strcmp(remoteVal, localVal) == 0)
continue;
/* Create new GUC nest level if we didn't already */
if (nestlevel < 0)
nestlevel = NewGUCNestLevel();
/* Apply the option (this will throw error on failure) */
(void) set_config_option(gucName, remoteVal,
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0);
}
return nestlevel;
}
| static HTAB * createConnHash | ( | void | ) | [static] |
Definition at line 2542 of file dblink.c.
References HASHCTL::entrysize, hash_create(), HASH_ELEM, HASHCTL::keysize, and NUMCONN.
Referenced by createNewConnection(), deleteConnection(), and getConnectionByName().
{
HASHCTL ctl;
ctl.keysize = NAMEDATALEN;
ctl.entrysize = sizeof(remoteConnHashEnt);
return hash_create("Remote Con hash", NUMCONN, &ctl, HASH_ELEM);
}
| static void createNewConnection | ( | const char * | name, | |
| remoteConn * | rconn | |||
| ) | [static] |
Definition at line 2553 of file dblink.c.
References remoteConn::conn, createConnHash(), ereport, errcode(), errmsg(), ERROR, HASH_ENTER, hash_search(), remoteConnHashEnt::name, pfree(), PQfinish(), pstrdup(), remoteConnHashEnt::rconn, strlcpy(), and truncate_identifier().
Referenced by dblink_connect().
{
remoteConnHashEnt *hentry;
bool found;
char *key;
if (!remoteConnHash)
remoteConnHash = createConnHash();
key = pstrdup(name);
truncate_identifier(key, strlen(key), true);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash, key,
HASH_ENTER, &found);
if (found)
{
PQfinish(rconn->conn);
pfree(rconn);
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_OBJECT),
errmsg("duplicate connection name")));
}
hentry->rconn = rconn;
strlcpy(hentry->name, name, sizeof(hentry->name));
}
| Datum dblink_build_sql_delete | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1698 of file dblink.c.
References AccessShareLock, ACL_SELECT, cstring_to_text(), ereport, errcode(), errmsg(), ERROR, get_rel_from_relname(), get_sql_delete(), get_text_array_contents(), PG_GETARG_ARRAYTYPE_P, PG_GETARG_INT32, PG_GETARG_POINTER, PG_GETARG_TEXT_P, PG_RETURN_TEXT_P, relation_close(), and validate_pkattnums().
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_arg = PG_GETARG_INT32(2);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
Relation rel;
int *pkattnums;
int pknumatts;
char **tgt_pkattvals;
int tgt_nitems;
char *sql;
/*
* Open target relation.
*/
rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
/*
* Process pkattnums argument.
*/
validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
&pkattnums, &pknumatts);
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_delete(rel, pkattnums, pknumatts, tgt_pkattvals);
/*
* Now we can close the relation.
*/
relation_close(rel, AccessShareLock);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
| Datum dblink_build_sql_insert | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1607 of file dblink.c.
References AccessShareLock, ACL_SELECT, cstring_to_text(), ereport, errcode(), errmsg(), ERROR, get_rel_from_relname(), get_sql_insert(), get_text_array_contents(), PG_GETARG_ARRAYTYPE_P, PG_GETARG_INT32, PG_GETARG_POINTER, PG_GETARG_TEXT_P, PG_RETURN_TEXT_P, relation_close(), and validate_pkattnums().
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_arg = PG_GETARG_INT32(2);
ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
Relation rel;
int *pkattnums;
int pknumatts;
char **src_pkattvals;
char **tgt_pkattvals;
int src_nitems;
int tgt_nitems;
char *sql;
/*
* Open target relation.
*/
rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
/*
* Process pkattnums argument.
*/
validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
&pkattnums, &pknumatts);
/*
* Source array is made up of key values that will be used to locate the
* tuple of interest from the local system.
*/
src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("source key array length must match number of key " \
"attributes")));
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_insert(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* Now we can close the relation.
*/
relation_close(rel, AccessShareLock);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
| Datum dblink_build_sql_update | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1775 of file dblink.c.
References AccessShareLock, ACL_SELECT, cstring_to_text(), ereport, errcode(), errmsg(), ERROR, get_rel_from_relname(), get_sql_update(), get_text_array_contents(), PG_GETARG_ARRAYTYPE_P, PG_GETARG_INT32, PG_GETARG_POINTER, PG_GETARG_TEXT_P, PG_RETURN_TEXT_P, relation_close(), and validate_pkattnums().
{
text *relname_text = PG_GETARG_TEXT_P(0);
int2vector *pkattnums_arg = (int2vector *) PG_GETARG_POINTER(1);
int32 pknumatts_arg = PG_GETARG_INT32(2);
ArrayType *src_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(3);
ArrayType *tgt_pkattvals_arry = PG_GETARG_ARRAYTYPE_P(4);
Relation rel;
int *pkattnums;
int pknumatts;
char **src_pkattvals;
char **tgt_pkattvals;
int src_nitems;
int tgt_nitems;
char *sql;
/*
* Open target relation.
*/
rel = get_rel_from_relname(relname_text, AccessShareLock, ACL_SELECT);
/*
* Process pkattnums argument.
*/
validate_pkattnums(rel, pkattnums_arg, pknumatts_arg,
&pkattnums, &pknumatts);
/*
* Source array is made up of key values that will be used to locate the
* tuple of interest from the local system.
*/
src_pkattvals = get_text_array_contents(src_pkattvals_arry, &src_nitems);
/*
* There should be one source array key value for each key attnum
*/
if (src_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("source key array length must match number of key " \
"attributes")));
/*
* Target array is made up of key values that will be used to build the
* SQL string for use on the remote system.
*/
tgt_pkattvals = get_text_array_contents(tgt_pkattvals_arry, &tgt_nitems);
/*
* There should be one target array key value for each key attnum
*/
if (tgt_nitems != pknumatts)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("target key array length must match number of key " \
"attributes")));
/*
* Prep work is finally done. Go get the SQL string.
*/
sql = get_sql_update(rel, pkattnums, pknumatts, src_pkattvals, tgt_pkattvals);
/*
* Now we can close the relation.
*/
relation_close(rel, AccessShareLock);
/*
* And send it
*/
PG_RETURN_TEXT_P(cstring_to_text(sql));
}
| Datum dblink_cancel_query | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1315 of file dblink.c.
References conn, cstring_to_text(), PG_RETURN_TEXT_P, PQcancel(), PQfreeCancel(), and PQgetCancel().
{
int res = 0;
char *conname = NULL;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
PGcancel *cancel;
char errbuf[256];
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
cancel = PQgetCancel(conn);
res = PQcancel(cancel, errbuf, 256);
PQfreeCancel(cancel);
if (res == 1)
PG_RETURN_TEXT_P(cstring_to_text("OK"));
else
PG_RETURN_TEXT_P(cstring_to_text(errbuf));
}
| Datum dblink_close | ( | PG_FUNCTION_ARGS | ) |
Definition at line 441 of file dblink.c.
References appendStringInfo(), BOOLOID, buf, remoteConn::conn, conn, cstring_to_text(), StringInfoData::data, dblink_res_error(), DBLINK_RES_INTERNALERROR, get_fn_expr_argtype(), getConnectionByName(), initStringInfo(), remoteConn::newXactForCursor, remoteConn::openCursorCount, PG_GETARG_BOOL, PG_GETARG_TEXT_PP, PG_NARGS, PG_RETURN_TEXT_P, PGRES_COMMAND_OK, PQclear(), PQexec(), PQresultStatus(), and text_to_cstring().
{
PGconn *conn = NULL;
PGresult *res = NULL;
char *curname = NULL;
char *conname = NULL;
StringInfoData buf;
char *msg;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible behavior */
DBLINK_INIT;
initStringInfo(&buf);
if (PG_NARGS() == 1)
{
/* text */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
rconn = pconn;
}
else if (PG_NARGS() == 2)
{
/* might be text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
rconn = pconn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
rconn = getConnectionByName(conname);
}
}
if (PG_NARGS() == 3)
{
/* text,text,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
rconn = getConnectionByName(conname);
}
if (!rconn || !rconn->conn)
DBLINK_CONN_NOT_AVAIL;
else
conn = rconn->conn;
appendStringInfo(&buf, "CLOSE %s", curname);
/* close the cursor */
res = PQexec(conn, buf.data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
dblink_res_error(conname, res, "could not close cursor", fail);
PG_RETURN_TEXT_P(cstring_to_text("ERROR"));
}
PQclear(res);
/* if we started a transaction, decrement cursor count */
if (rconn->newXactForCursor)
{
(rconn->openCursorCount)--;
/* if count is zero, commit the transaction */
if (rconn->openCursorCount == 0)
{
rconn->newXactForCursor = FALSE;
res = PQexec(conn, "COMMIT");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
DBLINK_RES_INTERNALERROR("commit error");
PQclear(res);
}
}
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
| Datum dblink_connect | ( | PG_FUNCTION_ARGS | ) |
Definition at line 243 of file dblink.c.
References remoteConn::conn, conn, CONNECTION_BAD, connstr, createNewConnection(), cstring_to_text(), dblink_connstr_check(), dblink_security_check(), ereport, errcode(), errdetail_internal(), errmsg(), ERROR, get_connect_string(), GetDatabaseEncodingName(), MemoryContextAlloc(), NULL, pfree(), PG_GETARG_TEXT_PP, PG_NARGS, PG_RETURN_TEXT_P, PQconnectdb(), PQerrorMessage(), PQfinish(), PQsetClientEncoding(), PQstatus(), pstrdup(), text_to_cstring(), and TopMemoryContext.
{
char *conname_or_str = NULL;
char *connstr = NULL;
char *connname = NULL;
char *msg;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
if (PG_NARGS() == 2)
{
conname_or_str = text_to_cstring(PG_GETARG_TEXT_PP(1));
connname = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else if (PG_NARGS() == 1)
conname_or_str = text_to_cstring(PG_GETARG_TEXT_PP(0));
if (connname)
rconn = (remoteConn *) MemoryContextAlloc(TopMemoryContext,
sizeof(remoteConn));
/* first check for valid foreign data server */
connstr = get_connect_string(conname_or_str);
if (connstr == NULL)
connstr = conname_or_str;
/* check password in connection string if not superuser */
dblink_connstr_check(connstr);
conn = PQconnectdb(connstr);
if (PQstatus(conn) == CONNECTION_BAD)
{
msg = pstrdup(PQerrorMessage(conn));
PQfinish(conn);
if (rconn)
pfree(rconn);
ereport(ERROR,
(errcode(ERRCODE_SQLCLIENT_UNABLE_TO_ESTABLISH_SQLCONNECTION),
errmsg("could not establish connection"),
errdetail_internal("%s", msg)));
}
/* check password actually used if not superuser */
dblink_security_check(conn, rconn);
/* attempt to set client encoding to match server encoding */
PQsetClientEncoding(conn, GetDatabaseEncodingName());
if (connname)
{
rconn->conn = conn;
createNewConnection(connname, rconn);
}
else
pconn->conn = conn;
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
| static void dblink_connstr_check | ( | const char * | connstr | ) | [static] |
Definition at line 2630 of file dblink.c.
References ereport, errcode(), errdetail(), errmsg(), ERROR, _PQconninfoOption::keyword, NULL, PQconninfoFree(), PQconninfoParse(), superuser(), and _PQconninfoOption::val.
Referenced by dblink_connect().
{
if (!superuser())
{
PQconninfoOption *options;
PQconninfoOption *option;
bool connstr_gives_password = false;
options = PQconninfoParse(connstr, NULL);
if (options)
{
for (option = options; option->keyword != NULL; option++)
{
if (strcmp(option->keyword, "password") == 0)
{
if (option->val != NULL && option->val[0] != '\0')
{
connstr_gives_password = true;
break;
}
}
}
PQconninfoFree(options);
}
if (!connstr_gives_password)
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("password is required"),
errdetail("Non-superusers must provide a password in the connection string.")));
}
}
| Datum dblink_current_query | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1856 of file dblink.c.
References current_query(), and PG_RETURN_DATUM.
{
/* This is now just an alias for the built-in function current_query() */
PG_RETURN_DATUM(current_query(fcinfo));
}
| Datum dblink_disconnect | ( | PG_FUNCTION_ARGS | ) |
Definition at line 310 of file dblink.c.
References remoteConn::conn, conn, cstring_to_text(), deleteConnection(), getConnectionByName(), pfree(), PG_GETARG_TEXT_PP, PG_NARGS, PG_RETURN_TEXT_P, PQfinish(), and text_to_cstring().
{
char *conname = NULL;
remoteConn *rconn = NULL;
PGconn *conn = NULL;
DBLINK_INIT;
if (PG_NARGS() == 1)
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
else
conn = pconn->conn;
if (!conn)
DBLINK_CONN_NOT_AVAIL;
PQfinish(conn);
if (rconn)
{
deleteConnection(conname);
pfree(rconn);
}
else
pconn->conn = NULL;
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
| Datum dblink_error_message | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1350 of file dblink.c.
References conn, cstring_to_text(), NULL, PG_RETURN_TEXT_P, and PQerrorMessage().
{
char *msg;
char *conname = NULL;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
msg = PQerrorMessage(conn);
if (msg == NULL || msg[0] == '\0')
PG_RETURN_TEXT_P(cstring_to_text("OK"));
else
PG_RETURN_TEXT_P(cstring_to_text(msg));
}
| Datum dblink_exec | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1372 of file dblink.c.
References BOOLOID, remoteConn::conn, conn, connstr, cstring_to_text(), dblink_res_error(), elog, ereport, errcode(), errmsg(), ERROR, get_fn_expr_argtype(), PG_CATCH, PG_END_TRY, PG_GETARG_BOOL, PG_GETARG_TEXT_PP, PG_NARGS, PG_RE_THROW, PG_RETURN_TEXT_P, PG_TRY, PGRES_COMMAND_OK, PGRES_TUPLES_OK, PQclear(), PQcmdStatus(), PQexec(), PQfinish(), PQresultStatus(), and text_to_cstring().
{
text *volatile sql_cmd_status = NULL;
PGconn *volatile conn = NULL;
volatile bool freeconn = false;
DBLINK_INIT;
PG_TRY();
{
char *msg;
PGresult *res = NULL;
char *connstr = NULL;
char *sql = NULL;
char *conname = NULL;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible behavior */
if (PG_NARGS() == 3)
{
/* must be text,text,bool */
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
}
else if (PG_NARGS() == 2)
{
/* might be text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
}
else
{
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
}
else if (PG_NARGS() == 1)
{
/* must be single text argument */
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
if (!conn)
DBLINK_CONN_NOT_AVAIL;
res = PQexec(conn, sql);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
dblink_res_error(conname, res, "could not execute command", fail);
/*
* and save a copy of the command status string to return as our
* result tuple
*/
sql_cmd_status = cstring_to_text("ERROR");
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/*
* and save a copy of the command status string to return as our
* result tuple
*/
sql_cmd_status = cstring_to_text(PQcmdStatus(res));
PQclear(res);
}
else
{
PQclear(res);
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("statement returning results not allowed")));
}
}
PG_CATCH();
{
/* if needed, close the connection to the database */
if (freeconn)
PQfinish(conn);
PG_RE_THROW();
}
PG_END_TRY();
/* if needed, close the connection to the database */
if (freeconn)
PQfinish(conn);
PG_RETURN_TEXT_P(sql_cmd_status);
}
| Datum dblink_fdw_validator | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1954 of file dblink.c.
References appendStringInfo(), buf, StringInfoData::data, DefElem::defname, ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, initStringInfo(), is_valid_dblink_option(), _PQconninfoOption::keyword, StringInfoData::len, lfirst, PG_GETARG_DATUM, PG_GETARG_OID, PG_RETURN_VOID, PQconndefaults(), and untransformRelOptions().
{
List *options_list = untransformRelOptions(PG_GETARG_DATUM(0));
Oid context = PG_GETARG_OID(1);
ListCell *cell;
static const PQconninfoOption *options = NULL;
/*
* Get list of valid libpq options.
*
* To avoid unnecessary work, we get the list once and use it throughout
* the lifetime of this backend process. We don't need to care about
* memory context issues, because PQconndefaults allocates with malloc.
*/
if (!options)
{
options = PQconndefaults();
if (!options) /* assume reason for failure is OOM */
ereport(ERROR,
(errcode(ERRCODE_FDW_OUT_OF_MEMORY),
errmsg("out of memory"),
errdetail("could not get libpq's default connection options")));
}
/* Validate each supplied option. */
foreach(cell, options_list)
{
DefElem *def = (DefElem *) lfirst(cell);
if (!is_valid_dblink_option(options, def->defname, context))
{
/*
* Unknown option, or invalid option for the context specified,
* so complain about it. Provide a hint with list of valid
* options for the context.
*/
StringInfoData buf;
const PQconninfoOption *opt;
initStringInfo(&buf);
for (opt = options; opt->keyword; opt++)
{
if (is_valid_dblink_option(options, opt->keyword, context))
appendStringInfo(&buf, "%s%s",
(buf.len > 0) ? ", " : "",
opt->keyword);
}
ereport(ERROR,
(errcode(ERRCODE_FDW_OPTION_NAME_NOT_FOUND),
errmsg("invalid option \"%s\"", def->defname),
errhint("Valid options in this context are: %s",
buf.data)));
}
}
PG_RETURN_VOID();
}
| Datum dblink_fetch | ( | PG_FUNCTION_ARGS | ) |
Definition at line 528 of file dblink.c.
References appendStringInfo(), BOOLOID, buf, remoteConn::conn, conn, StringInfoData::data, dblink_res_error(), ereport, errcode(), errmsg(), ERROR, get_fn_expr_argtype(), getConnectionByName(), initStringInfo(), materializeResult(), PG_GETARG_BOOL, PG_GETARG_INT32, PG_GETARG_TEXT_PP, PG_NARGS, PGRES_COMMAND_OK, PGRES_TUPLES_OK, PQclear(), PQexec(), PQresultStatus(), prepTuplestoreResult(), and text_to_cstring().
{
PGresult *res = NULL;
char *conname = NULL;
remoteConn *rconn = NULL;
PGconn *conn = NULL;
StringInfoData buf;
char *curname = NULL;
int howmany = 0;
bool fail = true; /* default to backward compatible */
prepTuplestoreResult(fcinfo);
DBLINK_INIT;
if (PG_NARGS() == 4)
{
/* text,text,int,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
howmany = PG_GETARG_INT32(2);
fail = PG_GETARG_BOOL(3);
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
else if (PG_NARGS() == 3)
{
/* text,text,int or text,int,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
howmany = PG_GETARG_INT32(1);
fail = PG_GETARG_BOOL(2);
conn = pconn->conn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
howmany = PG_GETARG_INT32(2);
rconn = getConnectionByName(conname);
if (rconn)
conn = rconn->conn;
}
}
else if (PG_NARGS() == 2)
{
/* text,int */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
howmany = PG_GETARG_INT32(1);
conn = pconn->conn;
}
if (!conn)
DBLINK_CONN_NOT_AVAIL;
initStringInfo(&buf);
appendStringInfo(&buf, "FETCH %d FROM %s", howmany, curname);
/*
* Try to execute the query. Note that since libpq uses malloc, the
* PGresult will be long-lived even though we are still in a short-lived
* memory context.
*/
res = PQexec(conn, buf.data);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
dblink_res_error(conname, res, "could not fetch from cursor", fail);
return (Datum) 0;
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/* cursor does not exist - closed already or bad name */
PQclear(res);
ereport(ERROR,
(errcode(ERRCODE_INVALID_CURSOR_NAME),
errmsg("cursor \"%s\" does not exist", curname)));
}
materializeResult(fcinfo, conn, res);
return (Datum) 0;
}
| Datum dblink_get_connections | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1254 of file dblink.c.
References accumArrayResult(), CStringGetTextDatum, CurrentMemoryContext, hash_seq_init(), hash_seq_search(), makeArrayResult(), remoteConnHashEnt::name, NULL, PG_RETURN_ARRAYTYPE_P, PG_RETURN_NULL, and TEXTOID.
{
HASH_SEQ_STATUS status;
remoteConnHashEnt *hentry;
ArrayBuildState *astate = NULL;
if (remoteConnHash)
{
hash_seq_init(&status, remoteConnHash);
while ((hentry = (remoteConnHashEnt *) hash_seq_search(&status)) != NULL)
{
/* stash away current value */
astate = accumArrayResult(astate,
CStringGetTextDatum(hentry->name),
false, TEXTOID, CurrentMemoryContext);
}
}
if (astate)
PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate,
CurrentMemoryContext));
else
PG_RETURN_NULL();
}
| Datum dblink_get_notify | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1874 of file dblink.c.
References pgNotify::be_pid, remoteConn::conn, conn, CreateTemplateTupleDesc(), CStringGetTextDatum, DBLINK_GET_NAMED_CONN, DBLINK_NOTIFY_COLS, ReturnSetInfo::econtext, ExprContext::ecxt_per_query_memory, pgNotify::extra, Int32GetDatum, INT4OID, MemoryContextSwitchTo(), NULL, PG_NARGS, PQconsumeInput(), PQfreemem(), PQnotifies(), prepTuplestoreResult(), pgNotify::relname, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, TEXTOID, TupleDescInitEntry(), tuplestore_begin_heap(), tuplestore_donestoring, tuplestore_putvalues(), values, and work_mem.
{
char *conname = NULL;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
PGnotify *notify;
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
TupleDesc tupdesc;
Tuplestorestate *tupstore;
MemoryContext per_query_ctx;
MemoryContext oldcontext;
prepTuplestoreResult(fcinfo);
DBLINK_INIT;
if (PG_NARGS() == 1)
DBLINK_GET_NAMED_CONN;
else
conn = pconn->conn;
/* create the tuplestore in per-query memory */
per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
oldcontext = MemoryContextSwitchTo(per_query_ctx);
tupdesc = CreateTemplateTupleDesc(DBLINK_NOTIFY_COLS, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "notify_name",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "be_pid",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "extra",
TEXTOID, -1, 0);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
PQconsumeInput(conn);
while ((notify = PQnotifies(conn)) != NULL)
{
Datum values[DBLINK_NOTIFY_COLS];
bool nulls[DBLINK_NOTIFY_COLS];
memset(values, 0, sizeof(values));
memset(nulls, 0, sizeof(nulls));
if (notify->relname != NULL)
values[0] = CStringGetTextDatum(notify->relname);
else
nulls[0] = true;
values[1] = Int32GetDatum(notify->be_pid);
if (notify->extra != NULL)
values[2] = CStringGetTextDatum(notify->extra);
else
nulls[2] = true;
tuplestore_putvalues(tupstore, tupdesc, values, nulls);
PQfreemem(notify);
PQconsumeInput(conn);
}
/* clean up and return the tuplestore */
tuplestore_donestoring(tupstore);
return (Datum) 0;
}
| Datum dblink_get_pkey | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1480 of file dblink.c.
References AccessShareLock, ACL_SELECT, FuncCallContext::attinmeta, BuildTupleFromCStrings(), FuncCallContext::call_cntr, CreateTemplateTupleDesc(), get_pkey_attnames(), get_rel_from_relname(), HeapTupleGetDatum, INT4OID, FuncCallContext::max_calls, MemoryContextSwitchTo(), FuncCallContext::multi_call_memory_ctx, NULL, palloc(), PG_GETARG_TEXT_P, relation_close(), SRF_FIRSTCALL_INIT, SRF_IS_FIRSTCALL, SRF_PERCALL_SETUP, SRF_RETURN_DONE, SRF_RETURN_NEXT, TEXTOID, TupleDescGetAttInMetadata(), TupleDescInitEntry(), FuncCallContext::user_fctx, and values.
{
int16 numatts;
char **results;
FuncCallContext *funcctx;
int32 call_cntr;
int32 max_calls;
AttInMetadata *attinmeta;
MemoryContext oldcontext;
/* stuff done only on the first call of the function */
if (SRF_IS_FIRSTCALL())
{
Relation rel;
TupleDesc tupdesc;
/* create a function context for cross-call persistence */
funcctx = SRF_FIRSTCALL_INIT();
/*
* switch to memory context appropriate for multiple function calls
*/
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
/* open target relation */
rel = get_rel_from_relname(PG_GETARG_TEXT_P(0), AccessShareLock, ACL_SELECT);
/* get the array of attnums */
results = get_pkey_attnames(rel, &numatts);
relation_close(rel, AccessShareLock);
/*
* need a tuple descriptor representing one INT and one TEXT column
*/
tupdesc = CreateTemplateTupleDesc(2, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "position",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "colname",
TEXTOID, -1, 0);
/*
* Generate attribute metadata needed later to produce tuples from raw
* C strings
*/
attinmeta = TupleDescGetAttInMetadata(tupdesc);
funcctx->attinmeta = attinmeta;
if ((results != NULL) && (numatts > 0))
{
funcctx->max_calls = numatts;
/* got results, keep track of them */
funcctx->user_fctx = results;
}
else
{
/* fast track when no results */
MemoryContextSwitchTo(oldcontext);
SRF_RETURN_DONE(funcctx);
}
MemoryContextSwitchTo(oldcontext);
}
/* stuff done on every call of the function */
funcctx = SRF_PERCALL_SETUP();
/*
* initialize per-call variables
*/
call_cntr = funcctx->call_cntr;
max_calls = funcctx->max_calls;
results = (char **) funcctx->user_fctx;
attinmeta = funcctx->attinmeta;
if (call_cntr < max_calls) /* do when there is more left to send */
{
char **values;
HeapTuple tuple;
Datum result;
values = (char **) palloc(2 * sizeof(char *));
values[0] = (char *) palloc(12); /* sign, 10 digits, '\0' */
sprintf(values[0], "%d", call_cntr + 1);
values[1] = results[call_cntr];
/* build the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
/* make the tuple into a datum */
result = HeapTupleGetDatum(tuple);
SRF_RETURN_NEXT(funcctx, result);
}
else
{
/* do when there is no more left */
SRF_RETURN_DONE(funcctx);
}
}
| Datum dblink_get_result | ( | PG_FUNCTION_ARGS | ) |
Definition at line 655 of file dblink.c.
References dblink_record_internal().
{
return dblink_record_internal(fcinfo, true);
}
| Datum dblink_is_busy | ( | PG_FUNCTION_ARGS | ) |
Definition at line 1289 of file dblink.c.
References conn, PG_RETURN_INT32, PQconsumeInput(), and PQisBusy().
{
char *conname = NULL;
PGconn *conn = NULL;
remoteConn *rconn = NULL;
DBLINK_INIT;
DBLINK_GET_NAMED_CONN;
PQconsumeInput(conn);
PG_RETURN_INT32(PQisBusy(conn));
}
| Datum dblink_open | ( | PG_FUNCTION_ARGS | ) |
Definition at line 348 of file dblink.c.
References appendStringInfo(), BOOLOID, buf, remoteConn::conn, conn, cstring_to_text(), StringInfoData::data, dblink_res_error(), DBLINK_RES_INTERNALERROR, get_fn_expr_argtype(), getConnectionByName(), initStringInfo(), remoteConn::newXactForCursor, remoteConn::openCursorCount, PG_GETARG_BOOL, PG_GETARG_TEXT_PP, PG_NARGS, PG_RETURN_TEXT_P, PGRES_COMMAND_OK, PQclear(), PQexec(), PQresultStatus(), PQTRANS_IDLE, PQtransactionStatus(), and text_to_cstring().
{
char *msg;
PGresult *res = NULL;
PGconn *conn = NULL;
char *curname = NULL;
char *sql = NULL;
char *conname = NULL;
StringInfoData buf;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible behavior */
DBLINK_INIT;
initStringInfo(&buf);
if (PG_NARGS() == 2)
{
/* text,text */
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
rconn = pconn;
}
else if (PG_NARGS() == 3)
{
/* might be text,text,text or text,text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 2) == BOOLOID)
{
curname = text_to_cstring(PG_GETARG_TEXT_PP(0));
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
rconn = pconn;
}
else
{
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
sql = text_to_cstring(PG_GETARG_TEXT_PP(2));
rconn = getConnectionByName(conname);
}
}
else if (PG_NARGS() == 4)
{
/* text,text,text,bool */
conname = text_to_cstring(PG_GETARG_TEXT_PP(0));
curname = text_to_cstring(PG_GETARG_TEXT_PP(1));
sql = text_to_cstring(PG_GETARG_TEXT_PP(2));
fail = PG_GETARG_BOOL(3);
rconn = getConnectionByName(conname);
}
if (!rconn || !rconn->conn)
DBLINK_CONN_NOT_AVAIL;
else
conn = rconn->conn;
/* If we are not in a transaction, start one */
if (PQtransactionStatus(conn) == PQTRANS_IDLE)
{
res = PQexec(conn, "BEGIN");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
DBLINK_RES_INTERNALERROR("begin error");
PQclear(res);
rconn->newXactForCursor = TRUE;
/*
* Since transaction state was IDLE, we force cursor count to
* initially be 0. This is needed as a previous ABORT might have wiped
* out our transaction without maintaining the cursor count for us.
*/
rconn->openCursorCount = 0;
}
/* if we started a transaction, increment cursor count */
if (rconn->newXactForCursor)
(rconn->openCursorCount)++;
appendStringInfo(&buf, "DECLARE %s CURSOR FOR %s", curname, sql);
res = PQexec(conn, buf.data);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
dblink_res_error(conname, res, "could not open cursor", fail);
PG_RETURN_TEXT_P(cstring_to_text("ERROR"));
}
PQclear(res);
PG_RETURN_TEXT_P(cstring_to_text("OK"));
}
| Datum dblink_record | ( | PG_FUNCTION_ARGS | ) |
Definition at line 621 of file dblink.c.
References dblink_record_internal().
{
return dblink_record_internal(fcinfo, false);
}
| static Datum dblink_record_internal | ( | FunctionCallInfo | fcinfo, | |
| bool | is_async | |||
| ) | [static] |
Definition at line 661 of file dblink.c.
References BOOLOID, remoteConn::conn, conn, connstr, dblink_res_error(), elog, ERROR, FunctionCallInfoData::flinfo, get_fn_expr_argtype(), materializeQueryResult(), materializeResult(), PG_CATCH, PG_END_TRY, PG_GETARG_BOOL, PG_GETARG_TEXT_PP, PG_NARGS, PG_RE_THROW, PG_TRY, PGRES_COMMAND_OK, PGRES_TUPLES_OK, PQfinish(), PQgetResult(), PQresultStatus(), prepTuplestoreResult(), and text_to_cstring().
Referenced by dblink_get_result(), and dblink_record().
{
PGconn *volatile conn = NULL;
volatile bool freeconn = false;
prepTuplestoreResult(fcinfo);
DBLINK_INIT;
PG_TRY();
{
char *msg;
char *connstr = NULL;
char *sql = NULL;
char *conname = NULL;
remoteConn *rconn = NULL;
bool fail = true; /* default to backward compatible */
if (!is_async)
{
if (PG_NARGS() == 3)
{
/* text,text,bool */
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
fail = PG_GETARG_BOOL(2);
}
else if (PG_NARGS() == 2)
{
/* text,text or text,bool */
if (get_fn_expr_argtype(fcinfo->flinfo, 1) == BOOLOID)
{
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
fail = PG_GETARG_BOOL(1);
}
else
{
DBLINK_GET_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
}
else if (PG_NARGS() == 1)
{
/* text */
conn = pconn->conn;
sql = text_to_cstring(PG_GETARG_TEXT_PP(0));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
}
else /* is_async */
{
/* get async result */
if (PG_NARGS() == 2)
{
/* text,bool */
DBLINK_GET_NAMED_CONN;
fail = PG_GETARG_BOOL(1);
}
else if (PG_NARGS() == 1)
{
/* text */
DBLINK_GET_NAMED_CONN;
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
}
if (!conn)
DBLINK_CONN_NOT_AVAIL;
if (!is_async)
{
/* synchronous query, use efficient tuple collection method */
materializeQueryResult(fcinfo, conn, conname, sql, fail);
}
else
{
/* async result retrieval, do it the old way */
PGresult *res = PQgetResult(conn);
/* NULL means we're all done with the async results */
if (res)
{
if (PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK)
{
dblink_res_error(conname, res, "could not execute query",
fail);
/* if fail isn't set, we'll return an empty query result */
}
else
{
materializeResult(fcinfo, conn, res);
}
}
}
}
PG_CATCH();
{
/* if needed, close the connection to the database */
if (freeconn)
PQfinish(conn);
PG_RE_THROW();
}
PG_END_TRY();
/* if needed, close the connection to the database */
if (freeconn)
PQfinish(conn);
return (Datum) 0;
}
| static void dblink_res_error | ( | const char * | conname, | |
| PGresult * | res, | |||
| const char * | dblink_context_msg, | |||
| bool | fail | |||
| ) | [static] |
Definition at line 2664 of file dblink.c.
References ereport, errcode(), errcontext, errdetail_internal(), errhint(), errmsg(), errmsg_internal(), MAKE_SQLSTATE, PG_DIAG_CONTEXT, PG_DIAG_MESSAGE_DETAIL, PG_DIAG_MESSAGE_HINT, PG_DIAG_MESSAGE_PRIMARY, PG_DIAG_SQLSTATE, PQclear(), PQresultErrorField(), and xpstrdup.
Referenced by dblink_close(), dblink_exec(), dblink_fetch(), dblink_open(), dblink_record_internal(), and materializeQueryResult().
{
int level;
char *pg_diag_sqlstate = PQresultErrorField(res, PG_DIAG_SQLSTATE);
char *pg_diag_message_primary = PQresultErrorField(res, PG_DIAG_MESSAGE_PRIMARY);
char *pg_diag_message_detail = PQresultErrorField(res, PG_DIAG_MESSAGE_DETAIL);
char *pg_diag_message_hint = PQresultErrorField(res, PG_DIAG_MESSAGE_HINT);
char *pg_diag_context = PQresultErrorField(res, PG_DIAG_CONTEXT);
int sqlstate;
char *message_primary;
char *message_detail;
char *message_hint;
char *message_context;
const char *dblink_context_conname = "unnamed";
if (fail)
level = ERROR;
else
level = NOTICE;
if (pg_diag_sqlstate)
sqlstate = MAKE_SQLSTATE(pg_diag_sqlstate[0],
pg_diag_sqlstate[1],
pg_diag_sqlstate[2],
pg_diag_sqlstate[3],
pg_diag_sqlstate[4]);
else
sqlstate = ERRCODE_CONNECTION_FAILURE;
xpstrdup(message_primary, pg_diag_message_primary);
xpstrdup(message_detail, pg_diag_message_detail);
xpstrdup(message_hint, pg_diag_message_hint);
xpstrdup(message_context, pg_diag_context);
if (res)
PQclear(res);
if (conname)
dblink_context_conname = conname;
ereport(level,
(errcode(sqlstate),
message_primary ? errmsg_internal("%s", message_primary) :
errmsg("unknown error"),
message_detail ? errdetail_internal("%s", message_detail) : 0,
message_hint ? errhint("%s", message_hint) : 0,
message_context ? errcontext("%s", message_context) : 0,
errcontext("Error occurred on dblink connection named \"%s\": %s.",
dblink_context_conname, dblink_context_msg)));
}
| static void dblink_security_check | ( | PGconn * | conn, | |
| remoteConn * | rconn | |||
| ) | [static] |
Definition at line 2604 of file dblink.c.
References ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, pfree(), PQconnectionUsedPassword(), PQfinish(), and superuser().
Referenced by dblink_connect().
{
if (!superuser())
{
if (!PQconnectionUsedPassword(conn))
{
PQfinish(conn);
if (rconn)
pfree(rconn);
ereport(ERROR,
(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
errmsg("password is required"),
errdetail("Non-superuser cannot connect if the server does not request a password."),
errhint("Target server's authentication method must be changed.")));
}
}
}
| Datum dblink_send_query | ( | PG_FUNCTION_ARGS | ) |
Definition at line 628 of file dblink.c.
References conn, elog, ERROR, NOTICE, PG_GETARG_TEXT_PP, PG_NARGS, PG_RETURN_INT32, PQerrorMessage(), PQsendQuery(), and text_to_cstring().
{
char *conname = NULL;
PGconn *conn = NULL;
char *sql = NULL;
remoteConn *rconn = NULL;
int retval;
if (PG_NARGS() == 2)
{
DBLINK_GET_NAMED_CONN;
sql = text_to_cstring(PG_GETARG_TEXT_PP(1));
}
else
/* shouldn't happen */
elog(ERROR, "wrong number of arguments");
/* async query send */
retval = PQsendQuery(conn, sql);
if (retval != 1)
elog(NOTICE, "could not send query: %s", PQerrorMessage(conn));
PG_RETURN_INT32(retval);
}
| static void deleteConnection | ( | const char * | name | ) | [static] |
Definition at line 2582 of file dblink.c.
References createConnHash(), ereport, errcode(), errmsg(), ERROR, HASH_REMOVE, hash_search(), pstrdup(), and truncate_identifier().
Referenced by dblink_disconnect().
{
remoteConnHashEnt *hentry;
bool found;
char *key;
if (!remoteConnHash)
remoteConnHash = createConnHash();
key = pstrdup(name);
truncate_identifier(key, strlen(key), false);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
key, HASH_REMOVE, &found);
if (!hentry)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("undefined connection name")));
}
| static char * escape_param_str | ( | const char * | from | ) | [static] |
Definition at line 2785 of file dblink.c.
References appendStringInfoChar(), buf, StringInfoData::data, and makeStringInfo().
Referenced by get_connect_string().
{
const char *cp;
StringInfo buf = makeStringInfo();
for (cp = str; *cp; cp++)
{
if (*cp == '\\' || *cp == '\'')
appendStringInfoChar(buf, '\\');
appendStringInfoChar(buf, *cp);
}
return buf->data;
}
| static char * generate_relation_name | ( | Relation | rel | ) | [static] |
Definition at line 2504 of file dblink.c.
References get_namespace_name(), quote_qualified_identifier(), RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, and RelationIsVisible().
Referenced by get_sql_delete(), get_sql_insert(), get_sql_update(), and get_tuple_of_interest().
{
char *nspname;
char *result;
/* Qualify the name if not visible in search path */
if (RelationIsVisible(RelationGetRelid(rel)))
nspname = NULL;
else
nspname = get_namespace_name(rel->rd_rel->relnamespace);
result = quote_qualified_identifier(nspname, RelationGetRelationName(rel));
return result;
}
| static int get_attnum_pk_pos | ( | int * | pkattnums, | |
| int | pknumatts, | |||
| int | key | |||
| ) | [static] |
Definition at line 2354 of file dblink.c.
References i.
Referenced by get_sql_insert(), and get_sql_update().
{
int i;
/*
* Not likely a long list anyway, so just scan for the value
*/
for (i = 0; i < pknumatts; i++)
if (key == pkattnums[i])
return i;
return -1;
}
| static char * get_connect_string | ( | const char * | servername | ) | [static] |
Definition at line 2719 of file dblink.c.
References ACL_KIND_FOREIGN_SERVER, ACL_USAGE, aclcheck_error(), ACLCHECK_OK, appendStringInfo(), DefElem::arg, buf, StringInfoData::data, DefElem::defname, escape_param_str(), ForeignServer::fdwid, GetForeignDataWrapper(), GetForeignServerByName(), GetUserId(), GetUserMapping(), lfirst, makeStringInfo(), UserMapping::options, ForeignServer::options, ForeignDataWrapper::options, pg_foreign_server_aclcheck(), pstrdup(), ForeignServer::serverid, ForeignServer::servername, strVal, and truncate_identifier().
Referenced by dblink_connect().
{
ForeignServer *foreign_server = NULL;
UserMapping *user_mapping;
ListCell *cell;
StringInfo buf = makeStringInfo();
ForeignDataWrapper *fdw;
AclResult aclresult;
char *srvname;
/* first gather the server connstr options */
srvname = pstrdup(servername);
truncate_identifier(srvname, strlen(srvname), false);
foreign_server = GetForeignServerByName(srvname, true);
if (foreign_server)
{
Oid serverid = foreign_server->serverid;
Oid fdwid = foreign_server->fdwid;
Oid userid = GetUserId();
user_mapping = GetUserMapping(userid, serverid);
fdw = GetForeignDataWrapper(fdwid);
/* Check permissions, user must have usage on the server. */
aclresult = pg_foreign_server_aclcheck(serverid, userid, ACL_USAGE);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_FOREIGN_SERVER, foreign_server->servername);
foreach(cell, fdw->options)
{
DefElem *def = lfirst(cell);
appendStringInfo(buf, "%s='%s' ", def->defname,
escape_param_str(strVal(def->arg)));
}
foreach(cell, foreign_server->options)
{
DefElem *def = lfirst(cell);
appendStringInfo(buf, "%s='%s' ", def->defname,
escape_param_str(strVal(def->arg)));
}
foreach(cell, user_mapping->options)
{
DefElem *def = lfirst(cell);
appendStringInfo(buf, "%s='%s' ", def->defname,
escape_param_str(strVal(def->arg)));
}
return buf->data;
}
else
return NULL;
}
Definition at line 2026 of file dblink.c.
References AccessShareLock, Anum_pg_index_indrelid, BTEqualStrategyNumber, GETSTRUCT, heap_close, heap_open(), HeapTupleIsValid, i, IndexIndrelidIndexId, IndexRelationId, ObjectIdGetDatum, palloc(), RelationData::rd_att, RelationGetRelid, ScanKeyInit(), SnapshotNow, SPI_fname(), systable_beginscan(), systable_endscan(), and systable_getnext().
Referenced by dblink_get_pkey().
{
Relation indexRelation;
ScanKeyData skey;
SysScanDesc scan;
HeapTuple indexTuple;
int i;
char **result = NULL;
TupleDesc tupdesc;
/* initialize numatts to 0 in case no primary key exists */
*numatts = 0;
tupdesc = rel->rd_att;
/* Prepare to scan pg_index for entries having indrelid = this rel. */
indexRelation = heap_open(IndexRelationId, AccessShareLock);
ScanKeyInit(&skey,
Anum_pg_index_indrelid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(RelationGetRelid(rel)));
scan = systable_beginscan(indexRelation, IndexIndrelidIndexId, true,
SnapshotNow, 1, &skey);
while (HeapTupleIsValid(indexTuple = systable_getnext(scan)))
{
Form_pg_index index = (Form_pg_index) GETSTRUCT(indexTuple);
/* we're only interested if it is the primary key */
if (index->indisprimary)
{
*numatts = index->indnatts;
if (*numatts > 0)
{
result = (char **) palloc(*numatts * sizeof(char *));
for (i = 0; i < *numatts; i++)
result[i] = SPI_fname(tupdesc, index->indkey.values[i]);
}
break;
}
}
systable_endscan(scan);
heap_close(indexRelation, AccessShareLock);
return result;
}
| static Relation get_rel_from_relname | ( | text * | relname_text, | |
| LOCKMODE | lockmode, | |||
| AclMode | aclmode | |||
| ) | [static] |
Definition at line 2479 of file dblink.c.
References ACL_KIND_CLASS, aclcheck_error(), ACLCHECK_OK, GetUserId(), heap_openrv(), makeRangeVarFromNameList(), pg_class_aclcheck(), RelationGetRelationName, RelationGetRelid, and textToQualifiedNameList().
Referenced by dblink_build_sql_delete(), dblink_build_sql_insert(), dblink_build_sql_update(), and dblink_get_pkey().
{
RangeVar *relvar;
Relation rel;
AclResult aclresult;
relvar = makeRangeVarFromNameList(textToQualifiedNameList(relname_text));
rel = heap_openrv(relvar, lockmode);
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
aclmode);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
return rel;
}
| static char * get_sql_delete | ( | Relation | rel, | |
| int * | pkattnums, | |||
| int | pknumatts, | |||
| char ** | tgt_pkattvals | |||
| ) | [static] |
Definition at line 2215 of file dblink.c.
References appendStringInfo(), appendStringInfoString(), tupleDesc::attrs, buf, StringInfoData::data, generate_relation_name(), i, initStringInfo(), NameStr, NULL, quote_ident_cstr(), quote_literal_cstr(), and RelationData::rd_att.
Referenced by dblink_build_sql_delete().
{
char *relname;
TupleDesc tupdesc;
StringInfoData buf;
int i;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(rel);
tupdesc = rel->rd_att;
appendStringInfo(&buf, "DELETE FROM %s WHERE ", relname);
for (i = 0; i < pknumatts; i++)
{
int pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
if (tgt_pkattvals[i] != NULL)
appendStringInfo(&buf, " = %s",
quote_literal_cstr(tgt_pkattvals[i]));
else
appendStringInfo(&buf, " IS NULL");
}
return (buf.data);
}
| static char * get_sql_insert | ( | Relation | rel, | |
| int * | pkattnums, | |||
| int | pknumatts, | |||
| char ** | src_pkattvals, | |||
| char ** | tgt_pkattvals | |||
| ) | [static] |
Definition at line 2137 of file dblink.c.
References appendStringInfo(), appendStringInfoString(), tupleDesc::attrs, buf, StringInfoData::data, ereport, errcode(), errmsg(), ERROR, generate_relation_name(), get_attnum_pk_pos(), get_tuple_of_interest(), i, initStringInfo(), NameStr, tupleDesc::natts, NULL, pfree(), pstrdup(), quote_ident_cstr(), quote_literal_cstr(), RelationData::rd_att, SPI_getvalue(), and val.
Referenced by dblink_build_sql_insert().
{
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
char *val;
int key;
int i;
bool needComma;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source row not found")));
appendStringInfo(&buf, "INSERT INTO %s(", relname);
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ",");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
needComma = true;
}
appendStringInfo(&buf, ") VALUES(");
/*
* Note: i is physical column number (counting from 0).
*/
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ",");
key = get_attnum_pk_pos(pkattnums, pknumatts, i);
if (key >= 0)
val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfoString(&buf, quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfo(&buf, "NULL");
needComma = true;
}
appendStringInfo(&buf, ")");
return (buf.data);
}
| static char * get_sql_update | ( | Relation | rel, | |
| int * | pkattnums, | |||
| int | pknumatts, | |||
| char ** | src_pkattvals, | |||
| char ** | tgt_pkattvals | |||
| ) | [static] |
Definition at line 2251 of file dblink.c.
References appendStringInfo(), appendStringInfoString(), tupleDesc::attrs, buf, StringInfoData::data, ereport, errcode(), errmsg(), ERROR, generate_relation_name(), get_attnum_pk_pos(), get_tuple_of_interest(), i, initStringInfo(), NameStr, tupleDesc::natts, NULL, pfree(), pstrdup(), quote_ident_cstr(), quote_literal_cstr(), RelationData::rd_att, SPI_getvalue(), and val.
Referenced by dblink_build_sql_update().
{
char *relname;
HeapTuple tuple;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
char *val;
int key;
int i;
bool needComma;
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
tuple = get_tuple_of_interest(rel, pkattnums, pknumatts, src_pkattvals);
if (!tuple)
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source row not found")));
appendStringInfo(&buf, "UPDATE %s SET ", relname);
/*
* Note: i is physical column number (counting from 0).
*/
needComma = false;
for (i = 0; i < natts; i++)
{
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfo(&buf, ", ");
appendStringInfo(&buf, "%s = ",
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
key = get_attnum_pk_pos(pkattnums, pknumatts, i);
if (key >= 0)
val = tgt_pkattvals[key] ? pstrdup(tgt_pkattvals[key]) : NULL;
else
val = SPI_getvalue(tuple, tupdesc, i + 1);
if (val != NULL)
{
appendStringInfoString(&buf, quote_literal_cstr(val));
pfree(val);
}
else
appendStringInfoString(&buf, "NULL");
needComma = true;
}
appendStringInfo(&buf, " WHERE ");
for (i = 0; i < pknumatts; i++)
{
int pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfo(&buf, "%s",
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
val = tgt_pkattvals[i];
if (val != NULL)
appendStringInfo(&buf, " = %s", quote_literal_cstr(val));
else
appendStringInfo(&buf, " IS NULL");
}
return (buf.data);
}
| static char ** get_text_array_contents | ( | ArrayType * | array, | |
| int * | numitems | |||
| ) | [static] |
Definition at line 2081 of file dblink.c.
References ARR_DATA_PTR, ARR_DIMS, ARR_ELEMTYPE, ARR_NDIM, ARR_NULLBITMAP, ArrayGetNItems(), Assert, att_addlength_pointer, att_align_nominal, get_typlenbyvalalign(), i, palloc(), PointerGetDatum, TextDatumGetCString, TEXTOID, and values.
Referenced by dblink_build_sql_delete(), dblink_build_sql_insert(), and dblink_build_sql_update().
{
int ndim = ARR_NDIM(array);
int *dims = ARR_DIMS(array);
int nitems;
int16 typlen;
bool typbyval;
char typalign;
char **values;
char *ptr;
bits8 *bitmap;
int bitmask;
int i;
Assert(ARR_ELEMTYPE(array) == TEXTOID);
*numitems = nitems = ArrayGetNItems(ndim, dims);
get_typlenbyvalalign(ARR_ELEMTYPE(array),
&typlen, &typbyval, &typalign);
values = (char **) palloc(nitems * sizeof(char *));
ptr = ARR_DATA_PTR(array);
bitmap = ARR_NULLBITMAP(array);
bitmask = 1;
for (i = 0; i < nitems; i++)
{
if (bitmap && (*bitmap & bitmask) == 0)
{
values[i] = NULL;
}
else
{
values[i] = TextDatumGetCString(PointerGetDatum(ptr));
ptr = att_addlength_pointer(ptr, typlen, ptr);
ptr = (char *) att_align_nominal(ptr, typalign);
}
/* advance bitmap pointer if any */
if (bitmap)
{
bitmask <<= 1;
if (bitmask == 0x100)
{
bitmap++;
bitmask = 1;
}
}
}
return values;
}
| static HeapTuple get_tuple_of_interest | ( | Relation | rel, | |
| int * | pkattnums, | |||
| int | pknumatts, | |||
| char ** | src_pkattvals | |||
| ) | [static] |
Definition at line 2369 of file dblink.c.
References appendStringInfo(), appendStringInfoString(), tupleDesc::attrs, buf, StringInfoData::data, elog, ereport, errcode(), errmsg(), ERROR, generate_relation_name(), i, initStringInfo(), NameStr, tupleDesc::natts, NULL, pfree(), quote_ident_cstr(), quote_literal_cstr(), RelationData::rd_att, SPI_connect(), SPI_copytuple(), SPI_exec(), SPI_finish(), SPI_OK_SELECT, SPI_processed, SPI_tuptable, and SPITupleTable::vals.
Referenced by get_sql_insert(), and get_sql_update().
{
char *relname;
TupleDesc tupdesc;
int natts;
StringInfoData buf;
int ret;
HeapTuple tuple;
int i;
/*
* Connect to SPI manager
*/
if ((ret = SPI_connect()) < 0)
/* internal error */
elog(ERROR, "SPI connect failure - returned %d", ret);
initStringInfo(&buf);
/* get relation name including any needed schema prefix and quoting */
relname = generate_relation_name(rel);
tupdesc = rel->rd_att;
natts = tupdesc->natts;
/*
* Build sql statement to look up tuple of interest, ie, the one matching
* src_pkattvals. We used to use "SELECT *" here, but it's simpler to
* generate a result tuple that matches the table's physical structure,
* with NULLs for any dropped columns. Otherwise we have to deal with two
* different tupdescs and everything's very confusing.
*/
appendStringInfoString(&buf, "SELECT ");
for (i = 0; i < natts; i++)
{
if (i > 0)
appendStringInfoString(&buf, ", ");
if (tupdesc->attrs[i]->attisdropped)
appendStringInfoString(&buf, "NULL");
else
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[i]->attname)));
}
appendStringInfo(&buf, " FROM %s WHERE ", relname);
for (i = 0; i < pknumatts; i++)
{
int pkattnum = pkattnums[i];
if (i > 0)
appendStringInfo(&buf, " AND ");
appendStringInfoString(&buf,
quote_ident_cstr(NameStr(tupdesc->attrs[pkattnum]->attname)));
if (src_pkattvals[i] != NULL)
appendStringInfo(&buf, " = %s",
quote_literal_cstr(src_pkattvals[i]));
else
appendStringInfo(&buf, " IS NULL");
}
/*
* Retrieve the desired tuple
*/
ret = SPI_exec(buf.data, 0);
pfree(buf.data);
/*
* Only allow one qualifying tuple
*/
if ((ret == SPI_OK_SELECT) && (SPI_processed > 1))
ereport(ERROR,
(errcode(ERRCODE_CARDINALITY_VIOLATION),
errmsg("source criteria matched more than one record")));
else if (ret == SPI_OK_SELECT && SPI_processed == 1)
{
SPITupleTable *tuptable = SPI_tuptable;
tuple = SPI_copytuple(tuptable->vals[0]);
SPI_finish();
return tuple;
}
else
{
/*
* no qualifying tuples
*/
SPI_finish();
return NULL;
}
/*
* never reached, but keep compiler quiet
*/
return NULL;
}
| static remoteConn * getConnectionByName | ( | const char * | name | ) | [static] |
Definition at line 2522 of file dblink.c.
References createConnHash(), HASH_FIND, hash_search(), NULL, pstrdup(), remoteConnHashEnt::rconn, and truncate_identifier().
Referenced by dblink_close(), dblink_disconnect(), dblink_fetch(), and dblink_open().
{
remoteConnHashEnt *hentry;
char *key;
if (!remoteConnHash)
remoteConnHash = createConnHash();
key = pstrdup(name);
truncate_identifier(key, strlen(key), false);
hentry = (remoteConnHashEnt *) hash_search(remoteConnHash,
key, HASH_FIND, NULL);
if (hentry)
return (hentry->rconn);
return (NULL);
}
| static bool is_valid_dblink_option | ( | const PQconninfoOption * | options, | |
| const char * | option, | |||
| Oid | context | |||
| ) | [static] |
Definition at line 2887 of file dblink.c.
References _PQconninfoOption::dispchar, ForeignServerRelationId, _PQconninfoOption::keyword, NULL, and UserMappingRelationId.
Referenced by dblink_fdw_validator().
{
const PQconninfoOption *opt;
/* Look up the option in libpq result */
for (opt = options; opt->keyword; opt++)
{
if (strcmp(opt->keyword, option) == 0)
break;
}
if (opt->keyword == NULL)
return false;
/* Disallow debug options (particularly "replication") */
if (strchr(opt->dispchar, 'D'))
return false;
/* Disallow "client_encoding" */
if (strcmp(opt->keyword, "client_encoding") == 0)
return false;
/*
* If the option is "user" or marked secure, it should be specified only
* in USER MAPPING. Others should be specified only in SERVER.
*/
if (strcmp(opt->keyword, "user") == 0 || strchr(opt->dispchar, '*'))
{
if (context != UserMappingRelationId)
return false;
}
else
{
if (context != ForeignServerRelationId)
return false;
}
return true;
}
| static void materializeQueryResult | ( | FunctionCallInfo | fcinfo, | |
| PGconn * | conn, | |||
| const char * | conname, | |||
| const char * | sql, | |||
| bool | fail | |||
| ) | [static] |
Definition at line 959 of file dblink.c.
References Assert, BuildTupleFromCStrings(), CreateTemplateTupleDesc(), dblink_res_error(), ReturnSetInfo::econtext, ExprContext::ecxt_per_query_memory, MemoryContextSwitchTo(), NULL, PG_CATCH, PG_END_TRY, PG_RE_THROW, PG_TRY, PGRES_COMMAND_OK, PGRES_TUPLES_OK, PQclear(), PQcmdStatus(), PQgetResult(), PQresultStatus(), FunctionCallInfoData::resultinfo, ReturnSetInfo::returnMode, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, SFRM_Materialize, storeQueryResult(), TEXTOID, TupleDescGetAttInMetadata(), TupleDescInitEntry(), tuplestore_begin_heap(), tuplestore_puttuple(), values, and work_mem.
Referenced by dblink_record_internal().
{
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
PGresult *volatile res = NULL;
storeInfo sinfo;
/* prepTuplestoreResult must have been called previously */
Assert(rsinfo->returnMode == SFRM_Materialize);
/* initialize storeInfo to empty */
memset(&sinfo, 0, sizeof(sinfo));
sinfo.fcinfo = fcinfo;
PG_TRY();
{
/* execute query, collecting any tuples into the tuplestore */
res = storeQueryResult(&sinfo, conn, sql);
if (!res ||
(PQresultStatus(res) != PGRES_COMMAND_OK &&
PQresultStatus(res) != PGRES_TUPLES_OK))
{
/*
* dblink_res_error will clear the passed PGresult, so we need
* this ugly dance to avoid doing so twice during error exit
*/
PGresult *res1 = res;
res = NULL;
dblink_res_error(conname, res1, "could not execute query", fail);
/* if fail isn't set, we'll return an empty query result */
}
else if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
/*
* storeRow didn't get called, so we need to convert the command
* status string to a tuple manually
*/
TupleDesc tupdesc;
AttInMetadata *attinmeta;
Tuplestorestate *tupstore;
HeapTuple tuple;
char *values[1];
MemoryContext oldcontext;
/*
* need a tuple descriptor representing one TEXT column to return
* the command status string as our result tuple
*/
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0);
attinmeta = TupleDescGetAttInMetadata(tupdesc);
oldcontext = MemoryContextSwitchTo(
rsinfo->econtext->ecxt_per_query_memory);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
values[0] = PQcmdStatus(res);
/* build the tuple and put it into the tuplestore. */
tuple = BuildTupleFromCStrings(attinmeta, values);
tuplestore_puttuple(tupstore, tuple);
PQclear(res);
res = NULL;
}
else
{
Assert(PQresultStatus(res) == PGRES_TUPLES_OK);
/* storeRow should have created a tuplestore */
Assert(rsinfo->setResult != NULL);
PQclear(res);
res = NULL;
}
PQclear(sinfo.last_res);
sinfo.last_res = NULL;
PQclear(sinfo.cur_res);
sinfo.cur_res = NULL;
}
PG_CATCH();
{
/* be sure to release any libpq result we collected */
PQclear(res);
PQclear(sinfo.last_res);
PQclear(sinfo.cur_res);
/* and clear out any pending data in libpq */
while ((res = PQgetResult(conn)) != NULL)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
}
| static void materializeResult | ( | FunctionCallInfo | fcinfo, | |
| PGconn * | conn, | |||
| PGresult * | res | |||
| ) | [static] |
Definition at line 813 of file dblink.c.
References applyRemoteGucs(), Assert, BuildTupleFromCStrings(), CreateTemplateTupleDesc(), CreateTupleDescCopy(), ReturnSetInfo::econtext, ExprContext::ecxt_per_query_memory, elog, ereport, errcode(), errmsg(), ERROR, get_call_result_type(), i, MemoryContextSwitchTo(), tupleDesc::natts, NULL, palloc(), PG_CATCH, PG_END_TRY, PG_RE_THROW, PG_TRY, PGRES_COMMAND_OK, PGRES_TUPLES_OK, PQclear(), PQcmdStatus(), PQgetisnull(), PQgetvalue(), PQnfields(), PQntuples(), PQresultStatus(), restoreLocalGucs(), FunctionCallInfoData::resultinfo, ReturnSetInfo::returnMode, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, SFRM_Materialize, TEXTOID, TupleDescGetAttInMetadata(), TupleDescInitEntry(), tuplestore_begin_heap(), tuplestore_donestoring, tuplestore_puttuple(), TYPEFUNC_COMPOSITE, TYPEFUNC_RECORD, values, and work_mem.
Referenced by dblink_fetch(), and dblink_record_internal().
{
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
/* prepTuplestoreResult must have been called previously */
Assert(rsinfo->returnMode == SFRM_Materialize);
PG_TRY();
{
TupleDesc tupdesc;
bool is_sql_cmd;
int ntuples;
int nfields;
if (PQresultStatus(res) == PGRES_COMMAND_OK)
{
is_sql_cmd = true;
/*
* need a tuple descriptor representing one TEXT column to return
* the command status string as our result tuple
*/
tupdesc = CreateTemplateTupleDesc(1, false);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "status",
TEXTOID, -1, 0);
ntuples = 1;
nfields = 1;
}
else
{
Assert(PQresultStatus(res) == PGRES_TUPLES_OK);
is_sql_cmd = false;
/* get a tuple descriptor for our result type */
switch (get_call_result_type(fcinfo, NULL, &tupdesc))
{
case TYPEFUNC_COMPOSITE:
/* success */
break;
case TYPEFUNC_RECORD:
/* failed to determine actual type of RECORD */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
break;
default:
/* result type isn't composite */
elog(ERROR, "return type must be a row type");
break;
}
/* make sure we have a persistent copy of the tupdesc */
tupdesc = CreateTupleDescCopy(tupdesc);
ntuples = PQntuples(res);
nfields = PQnfields(res);
}
/*
* check result and tuple descriptor have the same number of columns
*/
if (nfields != tupdesc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("remote query result rowtype does not match "
"the specified FROM clause rowtype")));
if (ntuples > 0)
{
AttInMetadata *attinmeta;
int nestlevel = -1;
Tuplestorestate *tupstore;
MemoryContext oldcontext;
int row;
char **values;
attinmeta = TupleDescGetAttInMetadata(tupdesc);
/* Set GUCs to ensure we read GUC-sensitive data types correctly */
if (!is_sql_cmd)
nestlevel = applyRemoteGucs(conn);
oldcontext = MemoryContextSwitchTo(
rsinfo->econtext->ecxt_per_query_memory);
tupstore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->setResult = tupstore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
values = (char **) palloc(nfields * sizeof(char *));
/* put all tuples into the tuplestore */
for (row = 0; row < ntuples; row++)
{
HeapTuple tuple;
if (!is_sql_cmd)
{
int i;
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, row, i))
values[i] = NULL;
else
values[i] = PQgetvalue(res, row, i);
}
}
else
{
values[0] = PQcmdStatus(res);
}
/* build the tuple and put it into the tuplestore. */
tuple = BuildTupleFromCStrings(attinmeta, values);
tuplestore_puttuple(tupstore, tuple);
}
/* clean up GUC settings, if we changed any */
restoreLocalGucs(nestlevel);
/* clean up and return the tuplestore */
tuplestore_donestoring(tupstore);
}
PQclear(res);
}
PG_CATCH();
{
/* be sure to release the libpq result */
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
}
| PG_FUNCTION_INFO_V1 | ( | dblink_get_notify | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_get_pkey | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_build_sql_delete | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_exec | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_get_connections | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_fdw_validator | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_current_query | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_build_sql_insert | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_close | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_fetch | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_get_result | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_record | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_disconnect | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_cancel_query | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_build_sql_update | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_send_query | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_error_message | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_connect | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_is_busy | ) |
| PG_FUNCTION_INFO_V1 | ( | dblink_open | ) |
| static void prepTuplestoreResult | ( | FunctionCallInfo | fcinfo | ) | [static] |
Definition at line 785 of file dblink.c.
References ReturnSetInfo::allowedModes, ereport, errcode(), errmsg(), ERROR, IsA, NULL, FunctionCallInfoData::resultinfo, ReturnSetInfo::returnMode, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, and SFRM_Materialize.
Referenced by dblink_fetch(), dblink_get_notify(), and dblink_record_internal().
{
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
/* check to see if query supports us returning a tuplestore */
if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("set-valued function called in context that cannot accept a set")));
if (!(rsinfo->allowedModes & SFRM_Materialize))
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("materialize mode required, but it is not allowed in this context")));
/* let the executor know we're sending back a tuplestore */
rsinfo->returnMode = SFRM_Materialize;
/* caller must fill these to return a non-empty result */
rsinfo->setResult = NULL;
rsinfo->setDesc = NULL;
}
| static char * quote_ident_cstr | ( | char * | rawstr | ) | [static] |
Definition at line 2339 of file dblink.c.
References cstring_to_text(), DatumGetTextP, DirectFunctionCall1, PointerGetDatum, quote_ident(), and text_to_cstring().
Referenced by get_sql_delete(), get_sql_insert(), get_sql_update(), and get_tuple_of_interest().
{
text *rawstr_text;
text *result_text;
char *result;
rawstr_text = cstring_to_text(rawstr);
result_text = DatumGetTextP(DirectFunctionCall1(quote_ident,
PointerGetDatum(rawstr_text)));
result = text_to_cstring(result_text);
return result;
}
| static void restoreLocalGucs | ( | int | nestlevel | ) | [static] |
Definition at line 2990 of file dblink.c.
References AtEOXact_GUC().
Referenced by materializeResult(), and storeQueryResult().
{
/* Do nothing if no new nestlevel was created */
if (nestlevel > 0)
AtEOXact_GUC(true, nestlevel);
}
Definition at line 1065 of file dblink.c.
References applyRemoteGucs(), CHECK_FOR_INTERRUPTS, storeInfo::cur_res, elog, ERROR, storeInfo::last_res, PGRES_SINGLE_TUPLE, PGRES_TUPLES_OK, PQclear(), PQerrorMessage(), PQgetResult(), PQresultStatus(), PQsendQuery(), PQsetSingleRowMode(), restoreLocalGucs(), and storeRow().
Referenced by materializeQueryResult().
{
bool first = true;
int nestlevel = -1;
PGresult *res;
if (!PQsendQuery(conn, sql))
elog(ERROR, "could not send query: %s", PQerrorMessage(conn));
if (!PQsetSingleRowMode(conn)) /* shouldn't fail */
elog(ERROR, "failed to set single-row mode for dblink query");
for (;;)
{
CHECK_FOR_INTERRUPTS();
sinfo->cur_res = PQgetResult(conn);
if (!sinfo->cur_res)
break;
if (PQresultStatus(sinfo->cur_res) == PGRES_SINGLE_TUPLE)
{
/* got one row from possibly-bigger resultset */
/*
* Set GUCs to ensure we read GUC-sensitive data types correctly.
* We shouldn't do this until we have a row in hand, to ensure
* libpq has seen any earlier ParameterStatus protocol messages.
*/
if (first && nestlevel < 0)
nestlevel = applyRemoteGucs(conn);
storeRow(sinfo, sinfo->cur_res, first);
PQclear(sinfo->cur_res);
sinfo->cur_res = NULL;
first = false;
}
else
{
/* if empty resultset, fill tuplestore header */
if (first && PQresultStatus(sinfo->cur_res) == PGRES_TUPLES_OK)
storeRow(sinfo, sinfo->cur_res, first);
/* store completed result at last_res */
PQclear(sinfo->last_res);
sinfo->last_res = sinfo->cur_res;
sinfo->cur_res = NULL;
first = true;
}
}
/* clean up GUC settings, if we changed any */
restoreLocalGucs(nestlevel);
/* return last_res */
res = sinfo->last_res;
sinfo->last_res = NULL;
return res;
}
Definition at line 1133 of file dblink.c.
References ALLOCSET_DEFAULT_INITSIZE, ALLOCSET_DEFAULT_MAXSIZE, ALLOCSET_DEFAULT_MINSIZE, AllocSetContextCreate(), Assert, storeInfo::attinmeta, BuildTupleFromCStrings(), CreateTupleDescCopy(), storeInfo::cstrs, CurrentMemoryContext, ReturnSetInfo::econtext, ExprContext::ecxt_per_query_memory, elog, ereport, errcode(), errmsg(), ERROR, storeInfo::fcinfo, get_call_result_type(), i, MemoryContextReset(), MemoryContextSwitchTo(), NULL, palloc(), pfree(), PQgetisnull(), PQgetvalue(), PQnfields(), PQntuples(), FunctionCallInfoData::resultinfo, ReturnSetInfo::setDesc, ReturnSetInfo::setResult, storeInfo::tmpcontext, TupleDescGetAttInMetadata(), storeInfo::tuplestore, tuplestore_begin_heap(), tuplestore_end(), tuplestore_puttuple(), TYPEFUNC_COMPOSITE, TYPEFUNC_RECORD, and work_mem.
Referenced by storeQueryResult().
{
int nfields = PQnfields(res);
HeapTuple tuple;
int i;
MemoryContext oldcontext;
if (first)
{
/* Prepare for new result set */
ReturnSetInfo *rsinfo = (ReturnSetInfo *) sinfo->fcinfo->resultinfo;
TupleDesc tupdesc;
/*
* It's possible to get more than one result set if the query string
* contained multiple SQL commands. In that case, we follow PQexec's
* traditional behavior of throwing away all but the last result.
*/
if (sinfo->tuplestore)
tuplestore_end(sinfo->tuplestore);
sinfo->tuplestore = NULL;
/* get a tuple descriptor for our result type */
switch (get_call_result_type(sinfo->fcinfo, NULL, &tupdesc))
{
case TYPEFUNC_COMPOSITE:
/* success */
break;
case TYPEFUNC_RECORD:
/* failed to determine actual type of RECORD */
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("function returning record called in context "
"that cannot accept type record")));
break;
default:
/* result type isn't composite */
elog(ERROR, "return type must be a row type");
break;
}
/* make sure we have a persistent copy of the tupdesc */
tupdesc = CreateTupleDescCopy(tupdesc);
/* check result and tuple descriptor have the same number of columns */
if (nfields != tupdesc->natts)
ereport(ERROR,
(errcode(ERRCODE_DATATYPE_MISMATCH),
errmsg("remote query result rowtype does not match "
"the specified FROM clause rowtype")));
/* Prepare attinmeta for later data conversions */
sinfo->attinmeta = TupleDescGetAttInMetadata(tupdesc);
/* Create a new, empty tuplestore */
oldcontext = MemoryContextSwitchTo(rsinfo->econtext->ecxt_per_query_memory);
sinfo->tuplestore = tuplestore_begin_heap(true, false, work_mem);
rsinfo->setResult = sinfo->tuplestore;
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
/* Done if empty resultset */
if (PQntuples(res) == 0)
return;
/*
* Set up sufficiently-wide string pointers array; this won't change
* in size so it's easy to preallocate.
*/
if (sinfo->cstrs)
pfree(sinfo->cstrs);
sinfo->cstrs = (char **) palloc(nfields * sizeof(char *));
/* Create short-lived memory context for data conversions */
if (!sinfo->tmpcontext)
sinfo->tmpcontext =
AllocSetContextCreate(CurrentMemoryContext,
"dblink temporary context",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
}
/* Should have a single-row result if we get here */
Assert(PQntuples(res) == 1);
/*
* Do the following work in a temp context that we reset after each tuple.
* This cleans up not only the data we have direct access to, but any
* cruft the I/O functions might leak.
*/
oldcontext = MemoryContextSwitchTo(sinfo->tmpcontext);
/*
* Fill cstrs with null-terminated strings of column values.
*/
for (i = 0; i < nfields; i++)
{
if (PQgetisnull(res, 0, i))
sinfo->cstrs[i] = NULL;
else
sinfo->cstrs[i] = PQgetvalue(res, 0, i);
}
/* Convert row to a tuple, and add it to the tuplestore */
tuple = BuildTupleFromCStrings(sinfo->attinmeta, sinfo->cstrs);
tuplestore_puttuple(sinfo->tuplestore, tuple);
/* Clean up */
MemoryContextSwitchTo(oldcontext);
MemoryContextReset(sinfo->tmpcontext);
}
| static void validate_pkattnums | ( | Relation | rel, | |
| int2vector * | pkattnums_arg, | |||
| int32 | pknumatts_arg, | |||
| int ** | pkattnums, | |||
| int * | pknumatts | |||
| ) | [static] |
Definition at line 2816 of file dblink.c.
References tupleDesc::attrs, int2vector::dim1, ereport, errcode(), errmsg(), ERROR, i, Min, tupleDesc::natts, palloc(), RelationData::rd_att, and int2vector::values.
Referenced by dblink_build_sql_delete(), dblink_build_sql_insert(), and dblink_build_sql_update().
{
TupleDesc tupdesc = rel->rd_att;
int natts = tupdesc->natts;
int i;
/* Don't take more array elements than there are */
pknumatts_arg = Min(pknumatts_arg, pkattnums_arg->dim1);
/* Must have at least one pk attnum selected */
if (pknumatts_arg <= 0)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("number of key attributes must be > 0")));
/* Allocate output array */
*pkattnums = (int *) palloc(pknumatts_arg * sizeof(int));
*pknumatts = pknumatts_arg;
/* Validate attnums and convert to internal form */
for (i = 0; i < pknumatts_arg; i++)
{
int pkattnum = pkattnums_arg->values[i];
int lnum;
int j;
/* Can throw error immediately if out of range */
if (pkattnum <= 0 || pkattnum > natts)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid attribute number %d", pkattnum)));
/* Identify which physical column has this logical number */
lnum = 0;
for (j = 0; j < natts; j++)
{
/* dropped columns don't count */
if (tupdesc->attrs[j]->attisdropped)
continue;
if (++lnum == pkattnum)
break;
}
if (j < natts)
(*pkattnums)[i] = j;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid attribute number %d", pkattnum)));
}
}
remoteConn* pconn = NULL [static] |
HTAB* remoteConnHash = NULL [static] |
1.7.1