greenplumn prepare 源码
greenplumn prepare 代码
文件路径：/src/include/commands/prepare.h
/*-------------------------------------------------------------------------
*
* prepare.h
* PREPARE, EXECUTE and DEALLOCATE commands, and prepared-stmt storage
*
*
* Copyright (c) 2002-2019, PostgreSQL Global Development Group
*
* src/include/commands/prepare.h
*
*-------------------------------------------------------------------------
*/
#ifndef PREPARE_H
#define PREPARE_H
#include "commands/explain.h"
#include "datatype/timestamp.h"
#include "utils/plancache.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,
int stmt_location, int stmt_len);
extern void ExecuteQuery(ExecuteStmt *stmt, IntoClause *intoClause,
const char *queryString, ParamListInfo params,
DestReceiver *dest, char *completionTag);
extern void DeallocateQuery(DeallocateStmt *stmt);
extern void ExplainExecuteQuery(ExecuteStmt *execstmt, IntoClause *into,
ExplainState *es, const char *queryString,
ParamListInfo params, QueryEnvironment *queryEnv);
/* Low-level access to stored prepared statements */
extern void StorePreparedStatement(const char *stmt_name,
CachedPlanSource *plansource,
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);
extern void DropAllPreparedStatements(void);
#endif /* PREPARE_H */
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