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/*------------------------------------------------------------------------- * * prepare.h * PREPARE, EXECUTE and DEALLOCATE commands, and prepared-stmt storage * * * Copyright (c) 2002-2016, 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); 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); /* 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 */