db_join.h

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1998-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: db_join.h,v 12.2 2005/06/16 20:21:47 bostic Exp $
 */

#ifndef _DB_JOIN_H_
#define _DB_JOIN_H_
/*
 * Joins use a join cursor that is similar to a regular DB cursor except
 * that it only supports c_get and c_close functionality.  Also, it does
 * not support the full range of flags for get.
 */
typedef struct __join_cursor {
        u_int8_t *j_exhausted;  /* Array of flags; is cursor i exhausted? */
        DBC     **j_curslist;   /* Array of cursors in the join: constant. */
        DBC     **j_fdupcurs;   /* Cursors w/ first instances of current dup. */
        DBC     **j_workcurs;   /* Scratch cursor copies to muck with. */
        DB       *j_primary;    /* Primary dbp. */
        DBT       j_key;        /* Used to do lookups. */
        DBT       j_rdata;      /* Memory used for data return. */
        u_int32_t j_ncurs;      /* How many cursors do we have? */
#define JOIN_RETRY      0x01    /* Error on primary get; re-return same key. */
        u_int32_t flags;
} JOIN_CURSOR;

#endif /* !_DB_JOIN_H_ */

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