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Add a new system view, pg_prepared_statements, that can be used to

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access information about the prepared statements that are available
in the current session. Original patch from Joachim Wieland, various
improvements by Neil Conway.

The "statement" column of the view contains the literal query string
sent by the client, without any rewriting or pretty printing. This
means that prepared statements created via SQL will be prefixed with
"PREPARE ... AS ", whereas those prepared via the FE/BE protocol will
not. That is unfortunate, but discussion on -patches did not yield an
efficient way to improve this, and there is some merit in returning
exactly what the client sent to the backend.

Catalog version bumped, regression tests updated.
This commit is contained in:
Neil Conway
2006-01-08 07:00:27 +00:00
parent afa8f1971a
commit 44b928e876
13 changed files with 362 additions and 32 deletions
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22
src/include/commands/prepare.h
View File

@@ -6,7 +6,7 @@
*
* Copyright (c) 2002-2005, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.16 2005/12/14 17:06:28 tgl Exp $
* $PostgreSQL: pgsql/src/include/commands/prepare.h,v 1.17 2006/01/08 07:00:26 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@@ -30,13 +30,16 @@
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 */
List *plan_list; /* list of plans */
List *argtype_list; /* list of parameter type OIDs */
MemoryContext context; /* context containing this query */
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;
@@ -54,7 +57,8 @@ extern void StorePreparedStatement(const char *stmt_name,
const char *commandTag,
List *query_list,
List *plan_list,
List *argtype_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);