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/*-------------------------------------------------------------------------
*
* prepare.h
* PREPARE, EXECUTE and DEALLOCATE commands, and prepared-stmt storage
*
*
* Copyright (c) 2002-2006, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.22 2006/10/04 00:30:08 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef PREPARE_H
#define PREPARE_H
#include "executor/executor.h"
#include "utils/timestamp.h"
/*
* The data structure representing a prepared statement
*
* Note: all subsidiary storage lives in the context denoted by the context
* field. However, the string referenced by commandTag is not subsidiary
* storage; it is assumed to be a compile-time-constant string. As with
* portals, commandTag shall be NULL if and only if the original query string
* (before rewriting) was an empty string.
*/
typedef struct
{
/* dynahash.c requires key to be first field */
char stmt_name[NAMEDATALEN];
char *query_string; /* text of query, or NULL */
const char *commandTag; /* command tag (a constant!), or NULL */
List *query_list; /* list of queries, rewritten */
List *plan_list; /* list of plans */
List *argtype_list; /* list of parameter type OIDs */
TimestampTz prepare_time; /* the time when the stmt was prepared */
bool from_sql; /* stmt prepared via SQL, not FE/BE protocol? */
MemoryContext context; /* context containing this query */
} PreparedStatement;
/* Utility statements PREPARE, EXECUTE, DEALLOCATE, EXPLAIN EXECUTE */
extern void PrepareQuery(PrepareStmt *stmt);
extern void ExecuteQuery(ExecuteStmt *stmt, ParamListInfo params,
DestReceiver *dest, char *completionTag);
extern void DeallocateQuery(DeallocateStmt *stmt);
extern void ExplainExecuteQuery(ExplainStmt *stmt, ParamListInfo params,
TupOutputState *tstate);
/* Low-level access to stored prepared statements */
extern void StorePreparedStatement(const char *stmt_name,
const char *query_string,
const char *commandTag,
List *query_list,
List *plan_list,
List *argtype_list,
bool from_sql);
extern PreparedStatement *FetchPreparedStatement(const char *stmt_name,
bool throwError);
extern void DropPreparedStatement(const char *stmt_name, bool showError);
extern List *FetchPreparedStatementParams(const char *stmt_name);
extern TupleDesc FetchPreparedStatementResultDesc(PreparedStatement *stmt);
extern bool PreparedStatementReturnsTuples(PreparedStatement *stmt);
extern List *FetchPreparedStatementTargetList(PreparedStatement *stmt);
#endif /* PREPARE_H */
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