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d13e903bea
reviewed by Neil Conway. This patch adds the following DDL command variants: RESET SESSION, RESET TEMP, RESET PLANS, CLOSE ALL, and DEALLOCATE ALL. RESET SESSION is intended for use by connection pool software and the like, in order to reset a client session to something close to its initial state. Note that while most of these command variants can be executed inside a transaction block (but are not transaction-aware!), RESET SESSION cannot. While this is inconsistent, it is intended to catch programmer mistakes: RESET SESSION in an open transaction block is probably unintended.
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* prepare.h
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* PREPARE, EXECUTE and DEALLOCATE commands, and prepared-stmt storage
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*
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*
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* Copyright (c) 2002-2007, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.26 2007/04/12 06:53:48 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PREPARE_H
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#define PREPARE_H
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#include "executor/executor.h"
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#include "utils/plancache.h"
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#include "utils/timestamp.h"
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/*
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* The data structure representing a prepared statement. This is now just
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* a thin veneer over a plancache entry --- the main addition is that of
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* a name.
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*
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* Note: all subsidiary storage lives in the referenced plancache entry.
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*/
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typedef struct
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{
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/* dynahash.c requires key to be first field */
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char stmt_name[NAMEDATALEN];
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CachedPlanSource *plansource; /* the actual cached plan */
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bool from_sql; /* prepared via SQL, not FE/BE protocol? */
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TimestampTz prepare_time; /* the time when the stmt was prepared */
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} PreparedStatement;
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/* Utility statements PREPARE, EXECUTE, DEALLOCATE, EXPLAIN EXECUTE */
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extern void PrepareQuery(PrepareStmt *stmt, const char *queryString);
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extern void ExecuteQuery(ExecuteStmt *stmt, const char *queryString,
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ParamListInfo params,
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DestReceiver *dest, char *completionTag);
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extern void DeallocateQuery(DeallocateStmt *stmt);
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extern void ExplainExecuteQuery(ExecuteStmt *execstmt, ExplainStmt *stmt,
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const char *queryString,
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ParamListInfo params, TupOutputState *tstate);
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/* Low-level access to stored prepared statements */
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extern void StorePreparedStatement(const char *stmt_name,
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Node *raw_parse_tree,
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const char *query_string,
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const char *commandTag,
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Oid *param_types,
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int num_params,
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List *stmt_list,
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bool from_sql);
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extern PreparedStatement *FetchPreparedStatement(const char *stmt_name,
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bool throwError);
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extern void DropPreparedStatement(const char *stmt_name, bool showError);
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extern TupleDesc FetchPreparedStatementResultDesc(PreparedStatement *stmt);
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extern List *FetchPreparedStatementTargetList(PreparedStatement *stmt);
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void DropAllPreparedStatements(void);
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#endif /* PREPARE_H */
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