Please apply attached patch to contrib/dblink. It adds named persistent
connections to dblink. Shridhar Daithanka
This commit is contained in:
Bruce Momjian
parent
92798de02e
commit
8f337e86cd
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@ -4,8 +4,11 @@
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* Functions returning results from a remote database
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*
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* Joe Conway <mail@joeconway.com>
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* And contributors:
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* Darko Prenosil <Darko.Prenosil@finteh.hr>
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* Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
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*
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* Copyright (c) 2001, 2002 by PostgreSQL Global Development Group
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* Copyright (c) 2001, 2002, 2003 by PostgreSQL Global Development Group
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* ALL RIGHTS RESERVED;
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*
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* Permission to use, copy, modify, and distribute this software and its
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@ -27,14 +30,16 @@
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*
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*/
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Version 0.5 (25 August, 2002):
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Major overhaul to work with new backend "table function" capability. Removed
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dblink_strtok() and dblink_replace() functions because they are now
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available as backend functions (split() and replace() respectively).
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Tested under Linux (Red Hat 7.3) and PostgreSQL 7.3devel. This version
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is no longer backwards portable to PostgreSQL 7.2.
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Version 0.6 (14 June, 2003):
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Completely removed previously deprecated functions. Added ability
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to create "named" persistent connections in addition to the single global
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"unnamed" persistent connection.
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Tested under Linux (Red Hat 9) and PostgreSQL 7.4devel.
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Release Notes:
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Version 0.6
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- functions deprecated in 0.5 have been removed
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- added ability to create "named" persistent connections
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Version 0.5
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- dblink now supports use directly as a table function; this is the new
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preferred usage going forward
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@ -87,35 +92,51 @@ Installation:
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connection
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------------
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dblink_connect(text) RETURNS text
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- opens a connection that will persist for duration of current
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- opens an unnamed connection that will persist for duration of
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current backend or until it is disconnected
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dblink_connect(text,text) RETURNS text
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- opens a named connection that will persist for duration of current
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backend or until it is disconnected
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dblink_disconnect() RETURNS text
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- disconnects a persistent connection
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- disconnects the unnamed persistent connection
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dblink_disconnect(text) RETURNS text
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- disconnects a named persistent connection
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cursor
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------------
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dblink_open(text,text) RETURNS text
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- opens a cursor using connection already opened with dblink_connect()
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that will persist for duration of current backend or until it is
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closed
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- opens a cursor using unnamed connection already opened with
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dblink_connect() that will persist for duration of current backend
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or until it is closed
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dblink_open(text,text,text) RETURNS text
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- opens a cursor using a named connection already opened with
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dblink_connect() that will persist for duration of current backend
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or until it is closed
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dblink_fetch(text, int) RETURNS setof record
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- fetches data from an already opened cursor
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- fetches data from an already opened cursor on the unnamed connection
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dblink_fetch(text, text, int) RETURNS setof record
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- fetches data from an already opened cursor on a named connection
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dblink_close(text) RETURNS text
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- closes a cursor
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- closes a cursor on the unnamed connection
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dblink_close(text,text) RETURNS text
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- closes a cursor on a named connection
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query
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------------
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dblink(text,text) RETURNS setof record
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- returns a set of results from remote SELECT query
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(Note: comment out in dblink.sql to use deprecated version)
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- returns a set of results from remote SELECT query; the first argument
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is either a connection string, or the name of an already opened
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persistant connection
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dblink(text) RETURNS setof record
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- returns a set of results from remote SELECT query, using connection
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already opened with dblink_connect()
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- returns a set of results from remote SELECT query, using the unnamed
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connection already opened with dblink_connect()
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execute
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------------
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dblink_exec(text, text) RETURNS text
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- executes an INSERT/UPDATE/DELETE query remotely
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- executes an INSERT/UPDATE/DELETE query remotely; the first argument
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is either a connection string, or the name of an already opened
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persistant connection
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dblink_exec(text) RETURNS text
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- executes an INSERT/UPDATE/DELETE query remotely, using connection
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already opened with dblink_connect()
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@ -136,19 +157,6 @@ Installation:
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- builds an update statement using a local tuple, replacing the
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selection key field values with alternate supplied values
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Not installed by default
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deprecated
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------------
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dblink(text,text) RETURNS setof int
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- *DEPRECATED* returns a resource id for results from remote query
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(Note: must uncomment in dblink.sql to use)
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dblink_tok(int,int) RETURNS text
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- *DEPRECATED* extracts and returns individual field results; used
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only in conjunction with the *DEPRECATED* form of dblink
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(Note: must uncomment in dblink.sql to use)
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dblink_last_oid(int) RETURNS oid
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- *DEPRECATED* returns the last inserted oid
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Documentation:
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Note: Parameters representing relation names must include double
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File diff suppressed because it is too large
Load Diff
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@ -4,8 +4,11 @@
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* Functions returning results from a remote database
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*
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* Joe Conway <mail@joeconway.com>
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* And contributors:
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* Darko Prenosil <Darko.Prenosil@finteh.hr>
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* Shridhar Daithankar <shridhar_daithankar@persistent.co.in>
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*
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* Copyright (c) 2001, 2002 by PostgreSQL Global Development Group
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* Copyright (c) 2001, 2002, 2003 by PostgreSQL Global Development Group
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* ALL RIGHTS RESERVED;
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*
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* Permission to use, copy, modify, and distribute this software and its
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@ -30,36 +33,9 @@
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#ifndef DBLINK_H
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#define DBLINK_H
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/*
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* This struct holds the results of the remote query.
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* Use fn_extra to hold a pointer to it across calls
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*/
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typedef struct
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{
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/*
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* last tuple number accessed
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*/
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int tup_num;
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/*
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* resource index number for this context
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*/
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int res_id_index;
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/*
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* the actual query results
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*/
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PGresult *res;
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} dblink_results;
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/*
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* External declarations
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*/
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/* deprecated */
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extern Datum dblink(PG_FUNCTION_ARGS);
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extern Datum dblink_tok(PG_FUNCTION_ARGS);
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/* supported */
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extern Datum dblink_connect(PG_FUNCTION_ARGS);
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extern Datum dblink_disconnect(PG_FUNCTION_ARGS);
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extern Datum dblink_open(PG_FUNCTION_ARGS);
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@ -68,7 +44,6 @@ extern Datum dblink_fetch(PG_FUNCTION_ARGS);
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extern Datum dblink_record(PG_FUNCTION_ARGS);
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extern Datum dblink_exec(PG_FUNCTION_ARGS);
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extern Datum dblink_get_pkey(PG_FUNCTION_ARGS);
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extern Datum dblink_last_oid(PG_FUNCTION_ARGS);
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extern Datum dblink_build_sql_insert(PG_FUNCTION_ARGS);
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extern Datum dblink_build_sql_delete(PG_FUNCTION_ARGS);
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extern Datum dblink_build_sql_update(PG_FUNCTION_ARGS);
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@ -1,50 +1,53 @@
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--
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-- Uncomment the following commented lines to use original DEPRECATED functions
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--
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--CREATE OR REPLACE FUNCTION dblink (text,text)
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--RETURNS setof int
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--AS 'MODULE_PATHNAME','dblink'
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--LANGUAGE 'C' WITH (isstrict);
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--CREATE OR REPLACE FUNCTION dblink_tok (int,int)
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--RETURNS text
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--AS 'MODULE_PATHNAME','dblink_tok'
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--LANGUAGE 'C' WITH (isstrict);
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--CREATE OR REPLACE FUNCTION dblink_last_oid (int)
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--RETURNS oid
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--AS 'MODULE_PATHNAME','dblink_last_oid'
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--LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_connect (text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_connect'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_connect (text, text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_connect'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_disconnect ()
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_disconnect'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_disconnect (text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_disconnect'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_open (text,text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_open'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_open (text,text,text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_open'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_fetch (text,int)
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RETURNS setof record
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AS 'MODULE_PATHNAME','dblink_fetch'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_fetch (text,text,int)
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RETURNS setof record
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AS 'MODULE_PATHNAME','dblink_fetch'
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LANGUAGE 'C' WITH (isstrict);
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CREATE OR REPLACE FUNCTION dblink_close (text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_close'
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LANGUAGE 'C' WITH (isstrict);
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-- Note: if this is not a first time install of dblink, uncomment the
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-- following DROP which prepares the database for the new, non-deprecated
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-- version.
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--DROP FUNCTION dblink (text,text);
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CREATE OR REPLACE FUNCTION dblink_close (text,text)
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RETURNS text
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AS 'MODULE_PATHNAME','dblink_close'
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LANGUAGE 'C' WITH (isstrict);
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-- Comment out the following 3 lines if the DEPRECATED functions are used.
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CREATE OR REPLACE FUNCTION dblink (text,text)
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RETURNS setof record
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AS 'MODULE_PATHNAME','dblink_record'
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@ -6,21 +6,35 @@ dblink_connect -- Opens a persistent connection to a remote database
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Synopsis
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dblink_connect(text connstr)
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dblink_connect(text connname, text connstr)
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Inputs
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connname
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if 2 arguments are given, the first is used as a name for a persistent
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connection
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connstr
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standard libpq format connection string,
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e.g. "hostaddr=127.0.0.1 port=5432 dbname=mydb user=postgres password=mypasswd"
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if only one argument is given, the connection is unnamed; only one unnamed
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connection can exist at a time
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Outputs
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Returns status = "OK"
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Example usage
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test=# select dblink_connect('dbname=template1');
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select dblink_connect('dbname=template1');
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dblink_connect
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----------------
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OK
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(1 row)
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select dblink_connect('myconn','dbname=template1');
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dblink_connect
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----------------
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OK
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@ -29,15 +43,18 @@ test=# select dblink_connect('dbname=template1');
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==================================================================
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Name
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dblink_disconnect -- Closes the persistent connection to a remote database
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dblink_disconnect -- Closes a persistent connection to a remote database
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Synopsis
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dblink_disconnect()
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dblink_disconnect(text connname)
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Inputs
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none
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connname
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if an argument is given, it is used as a name for a persistent
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connection to close; otherwiase the unnamed connection is closed
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Outputs
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@ -51,3 +68,8 @@ test=# select dblink_disconnect();
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OK
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(1 row)
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select dblink_disconnect('myconn');
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dblink_disconnect
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-------------------
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OK
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(1 row)
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@ -6,9 +6,14 @@ dblink_open -- Opens a cursor on a remote database
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Synopsis
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dblink_open(text cursorname, text sql)
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dblink_open(text connname, text cursorname, text sql)
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Inputs
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connname
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if three arguments are present, the first is taken as the specific
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connection name to use; otherwise the unnamed connection is assumed
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cursorname
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a reference name for the cursor
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@ -52,9 +57,14 @@ dblink_fetch -- Returns a set from an open cursor on a remote database
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Synopsis
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dblink_fetch(text cursorname, int32 howmany)
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dblink_fetch(text connname, text cursorname, int32 howmany)
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Inputs
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connname
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if three arguments are present, the first is taken as the specific
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connection name to use; otherwise the unnamed connection is assumed
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cursorname
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The reference name for the cursor
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@ -123,9 +133,14 @@ dblink_close -- Closes a cursor on a remote database
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Synopsis
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dblink_close(text cursorname)
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dblink_close(text connname, text cursorname)
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Inputs
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connname
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if two arguments are present, the first is taken as the specific
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connection name to use; otherwise the unnamed connection is assumed
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cursorname
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a reference name for the cursor
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@ -135,7 +150,8 @@ Outputs
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Returns status = "OK"
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Note
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dblink_connect(text connstr) must be executed first.
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dblink_connect(text connstr) or dblink_connect(text connname, text connstr)
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must be executed first.
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Example usage
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@ -157,3 +173,20 @@ test=# select dblink_close('foo');
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OK
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(1 row)
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select dblink_connect('myconn','dbname=regression');
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dblink_connect
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----------------
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OK
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(1 row)
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select dblink_open('myconn','foo','select proname, prosrc from pg_proc');
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dblink_open
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-------------
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OK
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(1 row)
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select dblink_close('myconn','foo');
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dblink_close
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--------------
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OK
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(1 row)
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|
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@ -6,22 +6,23 @@ dblink_exec -- Executes an UPDATE/INSERT/DELETE on a remote database
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Synopsis
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dblink_exec(text connstr, text sql)
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- or -
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dblink_exec(text connname, text sql)
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dblink_exec(text sql)
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Inputs
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connname
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connstr
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If two arguments are present, the first is first assumed to be a specific
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connection name to use. If the name is not found, the argument is then
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assumed to be a valid connection string, of standard libpq format,
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e.g.: "hostaddr=127.0.0.1 dbname=mydb user=postgres password=mypasswd"
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standard libpq format connection string,
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e.g. "hostaddr=127.0.0.1 port=5432 dbname=mydb user=postgres password=mypasswd"
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If the second form is used, then the dblink_connect(text connstr) must be
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executed first.
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If only one argument is used, then the unnamed connection is used.
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sql
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sql statement that you wish to execute on the remote host, e.g.:
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insert into foo values(0,'a','{"a0","b0","c0"}');
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Outputs
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@ -36,14 +37,26 @@ Notes
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Example usage
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test=# select dblink_connect('dbname=dblink_test_slave');
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select dblink_connect('dbname=dblink_test_slave');
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dblink_connect
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----------------
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OK
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(1 row)
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test=# select dblink_exec('insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
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select dblink_exec('insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
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dblink_exec
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-----------------
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INSERT 943366 1
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(1 row)
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select dblink_connect('myconn','dbname=regression');
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dblink_connect
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----------------
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OK
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(1 row)
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select dblink_exec('myconn','insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
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dblink_exec
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------------------
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INSERT 6432584 1
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(1 row)
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|
|
|
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|
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@ -6,17 +6,19 @@ dblink -- Returns a set from a remote database
|
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Synopsis
|
||||
|
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dblink(text connstr, text sql)
|
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- or -
|
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dblink(text connname, text sql)
|
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dblink(text sql)
|
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|
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Inputs
|
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|
||||
connname
|
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connstr
|
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If two arguments are present, the first is first assumed to be a specific
|
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connection name to use. If the name is not found, the argument is then
|
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assumed to be a valid connection string, of standard libpq format,
|
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e.g.: "hostaddr=127.0.0.1 dbname=mydb user=postgres password=mypasswd"
|
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|
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standard libpq format connection string,
|
||||
e.g. "hostaddr=127.0.0.1 port=5432 dbname=mydb user=postgres password=mypasswd"
|
||||
If the second form is used, then the dblink_connect(text connstr) must be
|
||||
executed first.
|
||||
If only one argument is used, then the unnamed connection is used.
|
||||
|
||||
sql
|
||||
|
||||
|
|
@ -29,7 +31,7 @@ Outputs
|
|||
|
||||
Example usage
|
||||
|
||||
test=# select * from dblink('dbname=template1','select proname, prosrc from pg_proc')
|
||||
select * from dblink('dbname=template1','select proname, prosrc from pg_proc')
|
||||
as t1(proname name, prosrc text) where proname like 'bytea%';
|
||||
proname | prosrc
|
||||
------------+------------
|
||||
|
|
@ -47,13 +49,13 @@ test=# select * from dblink('dbname=template1','select proname, prosrc from pg_p
|
|||
byteaout | byteaout
|
||||
(12 rows)
|
||||
|
||||
test=# select dblink_connect('dbname=template1');
|
||||
select dblink_connect('dbname=template1');
|
||||
dblink_connect
|
||||
----------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
test=# select * from dblink('select proname, prosrc from pg_proc')
|
||||
select * from dblink('select proname, prosrc from pg_proc')
|
||||
as t1(proname name, prosrc text) where proname like 'bytea%';
|
||||
proname | prosrc
|
||||
------------+------------
|
||||
|
|
@ -71,6 +73,33 @@ test=# select * from dblink('select proname, prosrc from pg_proc')
|
|||
byteaout | byteaout
|
||||
(12 rows)
|
||||
|
||||
select dblink_connect('myconn','dbname=regression');
|
||||
dblink_connect
|
||||
----------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
select * from dblink('myconn','select proname, prosrc from pg_proc')
|
||||
as t1(proname name, prosrc text) where proname like 'bytea%';
|
||||
proname | prosrc
|
||||
------------+------------
|
||||
bytearecv | bytearecv
|
||||
byteasend | byteasend
|
||||
byteale | byteale
|
||||
byteagt | byteagt
|
||||
byteage | byteage
|
||||
byteane | byteane
|
||||
byteacmp | byteacmp
|
||||
bytealike | bytealike
|
||||
byteanlike | byteanlike
|
||||
byteacat | byteacat
|
||||
byteaeq | byteaeq
|
||||
bytealt | bytealt
|
||||
byteain | byteain
|
||||
byteaout | byteaout
|
||||
(14 rows)
|
||||
|
||||
|
||||
==================================================================
|
||||
A more convenient way to use dblink may be to create a view:
|
||||
|
||||
|
|
|
|||
|
|
@ -106,11 +106,11 @@ WHERE t.a > 7;
|
|||
9 | j | {a9,b9,c9}
|
||||
(2 rows)
|
||||
|
||||
-- should generate "no connection available" error
|
||||
-- should generate "connection not available" error
|
||||
SELECT *
|
||||
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
ERROR: dblink: no connection available
|
||||
ERROR: dblink_record: connection not available
|
||||
-- create a persistent connection
|
||||
SELECT dblink_connect('dbname=regression');
|
||||
dblink_connect
|
||||
|
|
@ -172,10 +172,10 @@ SELECT dblink_close('rmt_foo_cursor');
|
|||
OK
|
||||
(1 row)
|
||||
|
||||
-- should generate "cursor rmt_foo_cursor does not exist" error
|
||||
-- should generate "cursor not found: rmt_foo_cursor" error
|
||||
SELECT *
|
||||
FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
ERROR: dblink_fetch: cursor rmt_foo_cursor does not exist
|
||||
ERROR: dblink_fetch: cursor not found: rmt_foo_cursor
|
||||
-- close the persistent connection
|
||||
SELECT dblink_disconnect();
|
||||
dblink_disconnect
|
||||
|
|
@ -183,11 +183,12 @@ SELECT dblink_disconnect();
|
|||
OK
|
||||
(1 row)
|
||||
|
||||
-- should generate "no connection available" error
|
||||
-- should generate "no connection to the server" error
|
||||
SELECT *
|
||||
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
ERROR: dblink: no connection available
|
||||
ERROR: dblink: sql error: no connection to the server
|
||||
|
||||
-- put more data into our slave table, first using arbitrary connection syntax
|
||||
-- but truncate the actual return value so we can use diff to check for success
|
||||
SELECT substr(dblink_exec('dbname=regression','INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6);
|
||||
|
|
@ -268,3 +269,198 @@ SELECT dblink_disconnect();
|
|||
OK
|
||||
(1 row)
|
||||
|
||||
--
|
||||
-- tests for the new named persistent connection syntax
|
||||
--
|
||||
-- should generate "missing "=" after "myconn" in connection info string" error
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
ERROR: dblink: connection error: missing "=" after "myconn" in connection info string
|
||||
|
||||
-- create a named persistent connection
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
dblink_connect
|
||||
----------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- use the named persistent connection
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
a | b | c
|
||||
----+---+---------------
|
||||
8 | i | {a8,b8,c8}
|
||||
9 | j | {a9,b9,c9}
|
||||
10 | k | {a10,b10,c10}
|
||||
(3 rows)
|
||||
|
||||
-- create a second named persistent connection
|
||||
-- should error with "cannot save named connection"
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
NOTICE: cannot use a connection name more than once
|
||||
ERROR: dblink_connect: cannot save named connection
|
||||
-- create a second named persistent connection with a new name
|
||||
SELECT dblink_connect('myconn2','dbname=regression');
|
||||
dblink_connect
|
||||
----------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- use the second named persistent connection
|
||||
SELECT *
|
||||
FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
a | b | c
|
||||
----+---+---------------
|
||||
8 | i | {a8,b8,c8}
|
||||
9 | j | {a9,b9,c9}
|
||||
10 | k | {a10,b10,c10}
|
||||
(3 rows)
|
||||
|
||||
-- close the second named persistent connection
|
||||
SELECT dblink_disconnect('myconn2');
|
||||
dblink_disconnect
|
||||
-------------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- open a cursor
|
||||
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
|
||||
dblink_open
|
||||
-------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- fetch some data
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
a | b | c
|
||||
---+---+------------
|
||||
0 | a | {a0,b0,c0}
|
||||
1 | b | {a1,b1,c1}
|
||||
2 | c | {a2,b2,c2}
|
||||
3 | d | {a3,b3,c3}
|
||||
(4 rows)
|
||||
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
a | b | c
|
||||
---+---+------------
|
||||
4 | e | {a4,b4,c4}
|
||||
5 | f | {a5,b5,c5}
|
||||
6 | g | {a6,b6,c6}
|
||||
7 | h | {a7,b7,c7}
|
||||
(4 rows)
|
||||
|
||||
-- this one only finds three rows left
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
a | b | c
|
||||
----+---+---------------
|
||||
8 | i | {a8,b8,c8}
|
||||
9 | j | {a9,b9,c9}
|
||||
10 | k | {a10,b10,c10}
|
||||
(3 rows)
|
||||
|
||||
-- close the cursor
|
||||
SELECT dblink_close('myconn','rmt_foo_cursor');
|
||||
dblink_close
|
||||
--------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- should generate "cursor not found: rmt_foo_cursor" error
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
ERROR: dblink_fetch: cursor not found: rmt_foo_cursor
|
||||
-- close the named persistent connection
|
||||
SELECT dblink_disconnect('myconn');
|
||||
dblink_disconnect
|
||||
-------------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- should generate "missing "=" after "myconn" in connection info string" error
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
ERROR: dblink: connection error: missing "=" after "myconn" in connection info string
|
||||
|
||||
-- create a named persistent connection
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
dblink_connect
|
||||
----------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- put more data into our slave table, using named persistent connection syntax
|
||||
-- but truncate the actual return value so we can use diff to check for success
|
||||
SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
|
||||
substr
|
||||
--------
|
||||
INSERT
|
||||
(1 row)
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
|
||||
a | b | c
|
||||
----+---+---------------
|
||||
0 | a | {a0,b0,c0}
|
||||
1 | b | {a1,b1,c1}
|
||||
2 | c | {a2,b2,c2}
|
||||
3 | d | {a3,b3,c3}
|
||||
4 | e | {a4,b4,c4}
|
||||
5 | f | {a5,b5,c5}
|
||||
6 | g | {a6,b6,c6}
|
||||
7 | h | {a7,b7,c7}
|
||||
8 | i | {a8,b8,c8}
|
||||
9 | j | {a9,b9,c9}
|
||||
10 | k | {a10,b10,c10}
|
||||
11 | l | {a11,b11,c11}
|
||||
(12 rows)
|
||||
|
||||
-- change some data
|
||||
SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
|
||||
dblink_exec
|
||||
-------------
|
||||
UPDATE 1
|
||||
(1 row)
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE a = 11;
|
||||
a | b | c
|
||||
----+---+---------------
|
||||
11 | l | {a11,b99,c11}
|
||||
(1 row)
|
||||
|
||||
-- delete some data
|
||||
SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
|
||||
dblink_exec
|
||||
-------------
|
||||
DELETE 1
|
||||
(1 row)
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE a = 11;
|
||||
a | b | c
|
||||
---+---+---
|
||||
(0 rows)
|
||||
|
||||
-- close the named persistent connection
|
||||
SELECT dblink_disconnect('myconn');
|
||||
dblink_disconnect
|
||||
-------------------
|
||||
OK
|
||||
(1 row)
|
||||
|
||||
-- close the named persistent connection again
|
||||
-- should get "connection named "myconn" not found" error
|
||||
SELECT dblink_disconnect('myconn');
|
||||
ERROR: dblink_disconnect: connection named "myconn" not found
|
||||
|
|
|
|||
|
|
@ -68,7 +68,7 @@ SELECT *
|
|||
FROM dblink('dbname=regression','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
||||
-- should generate "no connection available" error
|
||||
-- should generate "connection not available" error
|
||||
SELECT *
|
||||
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
|
@ -98,14 +98,14 @@ FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
|||
-- close the cursor
|
||||
SELECT dblink_close('rmt_foo_cursor');
|
||||
|
||||
-- should generate "cursor rmt_foo_cursor does not exist" error
|
||||
-- should generate "cursor not found: rmt_foo_cursor" error
|
||||
SELECT *
|
||||
FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
|
||||
-- close the persistent connection
|
||||
SELECT dblink_disconnect();
|
||||
|
||||
-- should generate "no connection available" error
|
||||
-- should generate "no connection to the server" error
|
||||
SELECT *
|
||||
FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
|
@ -143,3 +143,98 @@ WHERE a = 11;
|
|||
|
||||
-- close the persistent connection
|
||||
SELECT dblink_disconnect();
|
||||
|
||||
--
|
||||
-- tests for the new named persistent connection syntax
|
||||
--
|
||||
|
||||
-- should generate "missing "=" after "myconn" in connection info string" error
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
||||
-- create a named persistent connection
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
|
||||
-- use the named persistent connection
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
||||
-- create a second named persistent connection
|
||||
-- should error with "cannot save named connection"
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
|
||||
-- create a second named persistent connection with a new name
|
||||
SELECT dblink_connect('myconn2','dbname=regression');
|
||||
|
||||
-- use the second named persistent connection
|
||||
SELECT *
|
||||
FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
||||
-- close the second named persistent connection
|
||||
SELECT dblink_disconnect('myconn2');
|
||||
|
||||
-- open a cursor
|
||||
SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
|
||||
|
||||
-- fetch some data
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
|
||||
-- this one only finds three rows left
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
|
||||
-- close the cursor
|
||||
SELECT dblink_close('myconn','rmt_foo_cursor');
|
||||
|
||||
-- should generate "cursor not found: rmt_foo_cursor" error
|
||||
SELECT *
|
||||
FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
|
||||
|
||||
-- close the named persistent connection
|
||||
SELECT dblink_disconnect('myconn');
|
||||
|
||||
-- should generate "missing "=" after "myconn" in connection info string" error
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE t.a > 7;
|
||||
|
||||
-- create a named persistent connection
|
||||
SELECT dblink_connect('myconn','dbname=regression');
|
||||
|
||||
-- put more data into our slave table, using named persistent connection syntax
|
||||
-- but truncate the actual return value so we can use diff to check for success
|
||||
SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
|
||||
|
||||
-- change some data
|
||||
SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE a = 11;
|
||||
|
||||
-- delete some data
|
||||
SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
|
||||
|
||||
-- let's see it
|
||||
SELECT *
|
||||
FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
|
||||
WHERE a = 11;
|
||||
|
||||
-- close the named persistent connection
|
||||
SELECT dblink_disconnect('myconn');
|
||||
|
||||
-- close the named persistent connection again
|
||||
-- should get "connection named "myconn" not found" error
|
||||
SELECT dblink_disconnect('myconn');
|
||||
|
|
|
|||
Loading…
Reference in New Issue