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libpq: Add support for Close on portals and statements

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The following routines are added to libpq:
PGresult *PQclosePrepared(PGconn *conn, const char *stmt);
PGresult *PQclosePortal(PGconn *conn, const char *portal);
int PQsendClosePrepared(PGconn *conn, const char *stmt);
int PQsendClosePortal(PGconn *conn, const char *portal);

The "send" routines are non-blocking versions of the two others.

Close messages are part of the protocol but they did not have a libpq
implementation.  And, having these routines is for instance useful with
connection poolers as these can detect more easily Close messages
than DEALLOCATE queries.

The implementation takes advantage of what the Describe routines rely on
for portals and statements.  Some regression tests are added in
libpq_pipeline, for the four new routines, by closing portals and
statements created already by the tests.

Author: Jelte Fennema
Reviewed-by: Jian He, Michael Paquier
Discussion: https://postgr.es/m/CAGECzQTb4xFAopAVokudB+L62Kt44mNAL4Z9zZ7UTrs1TRFvWA@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-07-04 14:48:10 +09:00
parent 03f80daac8
commit 28b5726561
8 changed files with 337 additions and 32 deletions
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2
src/interfaces/libpq/libpq-int.h
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@@ -324,7 +324,7 @@ typedef enum
PGQUERY_PREPARE, /* Parse only (PQprepare) */
PGQUERY_DESCRIBE, /* Describe Statement or Portal */
PGQUERY_SYNC, /* Sync (at end of a pipeline) */
PGQUERY_CLOSE
PGQUERY_CLOSE /* Close Statement or Portal */
} PGQueryClass;
/*