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/*-------------------------------------------------------------------------
*
* prepare.h
* PREPARE, EXECUTE and DEALLOCATE commands, and prepared-stmt storage
*
*
* Copyright (c) 2002-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.28 2007/11/15 21:14:43 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PREPARE_H
#define PREPARE_H
#include "executor/executor.h"
#include "utils/plancache.h"
#include "utils/timestamp.h"
/*
* The data structure representing a prepared statement. This is now just
* a thin veneer over a plancache entry --- the main addition is that of
* a name.
*
* Note: all subsidiary storage lives in the referenced plancache entry.
*/
typedef struct
{
/* dynahash.c requires key to be first field */
char stmt_name[NAMEDATALEN];
CachedPlanSource *plansource; /* the actual cached plan */
bool from_sql; /* prepared via SQL, not FE/BE protocol? */
TimestampTz prepare_time; /* the time when the stmt was prepared */
} PreparedStatement;
/* Utility statements PREPARE, EXECUTE, DEALLOCATE, EXPLAIN EXECUTE */
extern void PrepareQuery(PrepareStmt *stmt, const char *queryString);
extern void ExecuteQuery(ExecuteStmt *stmt, const char *queryString,
ParamListInfo params,
DestReceiver *dest, char *completionTag);
extern void DeallocateQuery(DeallocateStmt *stmt);
extern void ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
const char *queryString,
ParamListInfo params, TupOutputState *tstate);
/* Low-level access to stored prepared statements */
extern void StorePreparedStatement(const char *stmt_name,
Node *raw_parse_tree,
const char *query_string,
const char *commandTag,
Oid *param_types,
int num_params,
int cursor_options,
List *stmt_list,
bool from_sql);
extern PreparedStatement *FetchPreparedStatement(const char *stmt_name,
bool throwError);
extern void DropPreparedStatement(const char *stmt_name, bool showError);
extern TupleDesc FetchPreparedStatementResultDesc(PreparedStatement *stmt);
extern List *FetchPreparedStatementTargetList(PreparedStatement *stmt);
void DropAllPreparedStatements(void);
#endif /* PREPARE_H */
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