mirror of
https://git.postgresql.org/git/postgresql.git
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f85f43dfb5
only remnant of this failed experiment is that the server will take SET AUTOCOMMIT TO ON. Still TODO: provide some client-side autocommit logic in libpq.
271 lines
7.9 KiB
Plaintext
271 lines
7.9 KiB
Plaintext
-- Adjust this setting to control where the objects get created.
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SET search_path = public;
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--
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-- Define the functions and test data
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-- therein.
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--
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-- Turn off echoing so that expected file does not depend on
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-- contents of dblink.sql.
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\set ECHO none
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CREATE TABLE foo(f1 int, f2 text, f3 text[], primary key (f1,f2));
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NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index 'foo_pkey' for table 'foo'
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INSERT INTO foo VALUES (0,'a','{"a0","b0","c0"}');
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INSERT INTO foo VALUES (1,'b','{"a1","b1","c1"}');
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INSERT INTO foo VALUES (2,'c','{"a2","b2","c2"}');
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INSERT INTO foo VALUES (3,'d','{"a3","b3","c3"}');
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INSERT INTO foo VALUES (4,'e','{"a4","b4","c4"}');
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INSERT INTO foo VALUES (5,'f','{"a5","b5","c5"}');
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INSERT INTO foo VALUES (6,'g','{"a6","b6","c6"}');
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INSERT INTO foo VALUES (7,'h','{"a7","b7","c7"}');
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INSERT INTO foo VALUES (8,'i','{"a8","b8","c8"}');
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INSERT INTO foo VALUES (9,'j','{"a9","b9","c9"}');
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-- misc utilities
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-- show the currently executing query
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SELECT 'hello' AS hello, dblink_current_query() AS query;
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hello | query
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-------+-----------------------------------------------------------
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hello | SELECT 'hello' AS hello, dblink_current_query() AS query;
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(1 row)
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-- list the primary key fields
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SELECT *
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FROM dblink_get_pkey('foo');
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position | colname
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----------+---------
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1 | f1
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2 | f2
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(2 rows)
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-- build an insert statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_insert('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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dblink_build_sql_insert
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-----------------------------------------------------------
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INSERT INTO foo(f1,f2,f3) VALUES('99','xyz','{a0,b0,c0}')
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(1 row)
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-- build an update statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_update('foo','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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dblink_build_sql_update
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----------------------------------------------------------------------------------------
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UPDATE foo SET f1 = '99', f2 = 'xyz', f3 = '{a0,b0,c0}' WHERE f1 = '99' AND f2 = 'xyz'
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(1 row)
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-- build a delete statement based on a local tuple,
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SELECT dblink_build_sql_delete('foo','1 2',2,'{"0", "a"}');
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dblink_build_sql_delete
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---------------------------------------------
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DELETE FROM foo WHERE f1 = '0' AND f2 = 'a'
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(1 row)
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-- retest using a quoted and schema qualified table
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CREATE SCHEMA "MySchema";
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CREATE TABLE "MySchema"."Foo"(f1 int, f2 text, f3 text[], primary key (f1,f2));
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NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index 'Foo_pkey' for table 'Foo'
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INSERT INTO "MySchema"."Foo" VALUES (0,'a','{"a0","b0","c0"}');
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-- list the primary key fields
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SELECT *
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FROM dblink_get_pkey('"MySchema"."Foo"');
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position | colname
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----------+---------
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1 | f1
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2 | f2
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(2 rows)
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-- build an insert statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_insert('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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dblink_build_sql_insert
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------------------------------------------------------------------------
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INSERT INTO "MySchema"."Foo"(f1,f2,f3) VALUES('99','xyz','{a0,b0,c0}')
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(1 row)
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-- build an update statement based on a local tuple,
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-- replacing the primary key values with new ones
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SELECT dblink_build_sql_update('"MySchema"."Foo"','1 2',2,'{"0", "a"}','{"99", "xyz"}');
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dblink_build_sql_update
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-----------------------------------------------------------------------------------------------------
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UPDATE "MySchema"."Foo" SET f1 = '99', f2 = 'xyz', f3 = '{a0,b0,c0}' WHERE f1 = '99' AND f2 = 'xyz'
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(1 row)
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-- build a delete statement based on a local tuple,
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SELECT dblink_build_sql_delete('"MySchema"."Foo"','1 2',2,'{"0", "a"}');
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dblink_build_sql_delete
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----------------------------------------------------------
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DELETE FROM "MySchema"."Foo" WHERE f1 = '0' AND f2 = 'a'
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(1 row)
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-- regular old dblink
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SELECT *
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FROM dblink('dbname=regression','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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(2 rows)
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-- should generate "no connection 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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-- create a persistent connection
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SELECT dblink_connect('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 persistent connection
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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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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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(2 rows)
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-- open a cursor
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SELECT dblink_open('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('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('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 two rows left
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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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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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(2 rows)
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-- close the cursor
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SELECT dblink_close('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 rmt_foo_cursor does not exist" 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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-- close the persistent connection
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SELECT dblink_disconnect();
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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 "no connection 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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-- 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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substr
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--------
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INSERT
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(1 row)
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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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----------------
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OK
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(1 row)
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-- put more data into our slave table, using 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('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('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('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('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('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('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 persistent connection
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SELECT dblink_disconnect();
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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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