params.c File Reference

#include "postgres.h"
#include "nodes/params.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"

Include dependency graph for params.c:

Go to the source code of this file.

Functions
ParamListInfo	copyParamList (ParamListInfo from)

---

Function Documentation

ParamListInfo copyParamList

(

ParamListInfo

from

)

Definition at line 34 of file params.c.

References datumCopy(), get_typlenbyval(), i, ParamExternData::isnull, NULL, ParamListInfoData::numParams, OidIsValid, palloc(), ParamListInfoData::paramFetch, ParamListInfoData::paramFetchArg, ParamListInfoData::params, ParamListInfoData::parserSetup, ParamListInfoData::parserSetupArg, ParamExternData::ptype, and ParamExternData::value.

Referenced by PerformCursorOpen(), and SPI_cursor_open_internal().

{
    ParamListInfo retval;
    Size        size;
    int         i;

    if (from == NULL || from->numParams <= 0)
        return NULL;

    /* sizeof(ParamListInfoData) includes the first array element */
    size = sizeof(ParamListInfoData) +
        (from->numParams - 1) * sizeof(ParamExternData);

    retval = (ParamListInfo) palloc(size);
    retval->paramFetch = NULL;
    retval->paramFetchArg = NULL;
    retval->parserSetup = NULL;
    retval->parserSetupArg = NULL;
    retval->numParams = from->numParams;

    for (i = 0; i < from->numParams; i++)
    {
        ParamExternData *oprm = &from->params[i];
        ParamExternData *nprm = &retval->params[i];
        int16       typLen;
        bool        typByVal;

        /* give hook a chance in case parameter is dynamic */
        if (!OidIsValid(oprm->ptype) && from->paramFetch != NULL)
            (*from->paramFetch) (from, i + 1);

        /* flat-copy the parameter info */
        *nprm = *oprm;

        /* need datumCopy in case it's a pass-by-reference datatype */
        if (nprm->isnull || !OidIsValid(nprm->ptype))
            continue;
        get_typlenbyval(nprm->ptype, &typLen, &typByVal);
        nprm->value = datumCopy(nprm->value, typByVal, typLen);
    }

    return retval;
}