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63 lines
2.2 KiB
C
63 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) 2002-2003, PostgreSQL Global Development Group
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*
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* $Id: prepare.h,v 1.7 2003/08/04 00:43:30 momjian 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 "nodes/parsenodes.h"
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#include "tcop/dest.h"
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/*
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* The data structure representing a prepared statement
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*
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* Note: all subsidiary storage lives in the context denoted by the context
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* field. However, the string referenced by commandTag is not subsidiary
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* storage; it is assumed to be a compile-time-constant string. As with
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* portals, commandTag shall be NULL if and only if the original query string
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* (before rewriting) was an empty string.
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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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char *query_string; /* text of query, or NULL */
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const char *commandTag; /* command tag (a constant!), or NULL */
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List *query_list; /* list of queries */
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List *plan_list; /* list of plans */
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List *argtype_list; /* list of parameter type OIDs */
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MemoryContext context; /* context containing this query */
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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);
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extern void ExecuteQuery(ExecuteStmt *stmt, DestReceiver *dest);
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extern void DeallocateQuery(DeallocateStmt *stmt);
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extern void ExplainExecuteQuery(ExplainStmt *stmt, 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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const char *query_string,
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const char *commandTag,
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List *query_list,
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List *plan_list,
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List *argtype_list);
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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 List *FetchPreparedStatementParams(const char *stmt_name);
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extern TupleDesc FetchPreparedStatementResultDesc(PreparedStatement * stmt);
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#endif /* PREPARE_H */
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