203 lines
6.0 KiB
Plaintext
203 lines
6.0 KiB
Plaintext
\connect dblink_test_slave
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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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\connect dblink_test_master
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-- regular old dblink
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select * from dblink('dbname=dblink_test_slave','select * from foo') as t(a int, b text, c text[]) 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 * from dblink('select * from foo') as t(a int, b text, c text[]) 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=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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-- use the persistent connection
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select * from dblink('select * from foo') as t(a int, b text, c text[]) 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 * 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 * 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 * 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 * 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 * from dblink('select * from foo') as t(a int, b text, c text[]) 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=dblink_test_slave','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=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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-- 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 * 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 * from dblink('select * from foo') as t(a int, b text, c text[]) 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 * from dblink('select * from foo') as t(a int, b text, c text[]) where a = 11;
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a | b | c
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---+---+---
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(0 rows)
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-- misc utilities
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\connect dblink_test_slave
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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 * 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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