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Please apply attached patch to contrib/dblink. It adds named persistent
connections to dblink. Shridhar Daithanka
This commit is contained in:
Bruce Momjian
@ -106,11 +106,11 @@ WHERE t.a > 7;
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9 | j | {a9,b9,c9}
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(2 rows)
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-- should generate "no connection available" error
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-- should generate "connection not available" error
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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ERROR: dblink: no connection available
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ERROR: dblink_record: connection not available
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-- create a persistent connection
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SELECT dblink_connect('dbname=regression');
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dblink_connect
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@ -172,10 +172,10 @@ SELECT dblink_close('rmt_foo_cursor');
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OK
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(1 row)
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-- should generate "cursor rmt_foo_cursor does not exist" error
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-- should generate "cursor not found: rmt_foo_cursor" error
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SELECT *
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FROM dblink_fetch('rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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ERROR: dblink_fetch: cursor rmt_foo_cursor does not exist
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ERROR: dblink_fetch: cursor not found: rmt_foo_cursor
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-- close the persistent connection
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SELECT dblink_disconnect();
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dblink_disconnect
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@ -183,11 +183,12 @@ SELECT dblink_disconnect();
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OK
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(1 row)
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-- should generate "no connection available" error
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-- should generate "no connection to the server" error
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SELECT *
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FROM dblink('SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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ERROR: dblink: no connection available
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ERROR: dblink: sql error: no connection to the server
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-- put more data into our slave table, first using arbitrary connection syntax
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-- but truncate the actual return value so we can use diff to check for success
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SELECT substr(dblink_exec('dbname=regression','INSERT INTO foo VALUES(10,''k'',''{"a10","b10","c10"}'')'),1,6);
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@ -268,3 +269,198 @@ SELECT dblink_disconnect();
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OK
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(1 row)
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--
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-- tests for the new named persistent connection syntax
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--
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-- should generate "missing "=" after "myconn" in connection info string" error
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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ERROR: dblink: connection error: missing "=" after "myconn" in connection info string
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-- create a named persistent connection
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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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-- use the named persistent connection
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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a | b | c
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----+---+---------------
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8 | i | {a8,b8,c8}
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9 | j | {a9,b9,c9}
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10 | k | {a10,b10,c10}
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(3 rows)
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-- create a second named persistent connection
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-- should error with "cannot save named connection"
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SELECT dblink_connect('myconn','dbname=regression');
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NOTICE: cannot use a connection name more than once
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ERROR: dblink_connect: cannot save named connection
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-- create a second named persistent connection with a new name
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SELECT dblink_connect('myconn2','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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-- use the second named persistent connection
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SELECT *
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FROM dblink('myconn2','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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a | b | c
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----+---+---------------
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8 | i | {a8,b8,c8}
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9 | j | {a9,b9,c9}
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10 | k | {a10,b10,c10}
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(3 rows)
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-- close the second named persistent connection
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SELECT dblink_disconnect('myconn2');
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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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-- open a cursor
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SELECT dblink_open('myconn','rmt_foo_cursor','SELECT * FROM foo');
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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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-- fetch some data
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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a | b | c
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---+---+------------
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0 | a | {a0,b0,c0}
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1 | b | {a1,b1,c1}
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2 | c | {a2,b2,c2}
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3 | d | {a3,b3,c3}
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(4 rows)
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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a | b | c
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---+---+------------
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4 | e | {a4,b4,c4}
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5 | f | {a5,b5,c5}
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6 | g | {a6,b6,c6}
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7 | h | {a7,b7,c7}
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(4 rows)
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-- this one only finds three rows left
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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a | b | c
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----+---+---------------
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8 | i | {a8,b8,c8}
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9 | j | {a9,b9,c9}
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10 | k | {a10,b10,c10}
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(3 rows)
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-- close the cursor
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SELECT dblink_close('myconn','rmt_foo_cursor');
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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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-- should generate "cursor not found: rmt_foo_cursor" error
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SELECT *
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FROM dblink_fetch('myconn','rmt_foo_cursor',4) AS t(a int, b text, c text[]);
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ERROR: dblink_fetch: cursor not found: rmt_foo_cursor
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-- close the named persistent connection
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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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-- should generate "missing "=" after "myconn" in connection info string" error
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE t.a > 7;
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ERROR: dblink: connection error: missing "=" after "myconn" in connection info string
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-- create a named persistent connection
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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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-- put more data into our slave table, using named persistent connection syntax
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-- but truncate the actual return value so we can use diff to check for success
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SELECT substr(dblink_exec('myconn','INSERT INTO foo VALUES(11,''l'',''{"a11","b11","c11"}'')'),1,6);
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substr
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--------
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INSERT
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(1 row)
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[]);
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a | b | c
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----+---+---------------
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0 | a | {a0,b0,c0}
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1 | b | {a1,b1,c1}
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2 | c | {a2,b2,c2}
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3 | d | {a3,b3,c3}
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4 | e | {a4,b4,c4}
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5 | f | {a5,b5,c5}
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6 | g | {a6,b6,c6}
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7 | h | {a7,b7,c7}
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8 | i | {a8,b8,c8}
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9 | j | {a9,b9,c9}
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10 | k | {a10,b10,c10}
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11 | l | {a11,b11,c11}
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(12 rows)
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-- change some data
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SELECT dblink_exec('myconn','UPDATE foo SET f3[2] = ''b99'' WHERE f1 = 11');
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dblink_exec
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-------------
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UPDATE 1
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(1 row)
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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a | b | c
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----+---+---------------
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11 | l | {a11,b99,c11}
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(1 row)
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-- delete some data
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SELECT dblink_exec('myconn','DELETE FROM foo WHERE f1 = 11');
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dblink_exec
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-------------
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DELETE 1
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(1 row)
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-- let's see it
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SELECT *
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FROM dblink('myconn','SELECT * FROM foo') AS t(a int, b text, c text[])
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WHERE a = 11;
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a | b | c
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---+---+---
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(0 rows)
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-- close the named persistent connection
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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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-- close the named persistent connection again
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-- should get "connection named "myconn" not found" error
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SELECT dblink_disconnect('myconn');
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ERROR: dblink_disconnect: connection named "myconn" not found
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