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CREATE TABLE test1 (a int, b text);
CREATE PROCEDURE transaction_test1()
LANGUAGE pltcl
AS $$
for {set i 0} {$i < 10} {incr i} {
spi_exec "INSERT INTO test1 (a) VALUES ($i)"
if {$i % 2 == 0} {
commit
} else {
rollback
}
}
$$;
CALL transaction_test1();
SELECT * FROM test1;
a | b
---+---
0 |
2 |
4 |
6 |
8 |
(5 rows)
TRUNCATE test1;
-- not allowed in a function
CREATE FUNCTION transaction_test2() RETURNS int
LANGUAGE pltcl
AS $$
for {set i 0} {$i < 10} {incr i} {
spi_exec "INSERT INTO test1 (a) VALUES ($i)"
if {$i % 2 == 0} {
commit
} else {
rollback
}
}
return 1
$$;
SELECT transaction_test2();
ERROR: invalid transaction termination
CONTEXT: while executing
"commit"
(procedure "__PLTcl_proc_transaction_test2" line 6)
invoked from within
"__PLTcl_proc_transaction_test2"
in PL/Tcl function transaction_test2()
SELECT * FROM test1;
a | b
---+---
(0 rows)
-- also not allowed if procedure is called from a function
CREATE FUNCTION transaction_test3() RETURNS int
LANGUAGE pltcl
AS $$
spi_exec "CALL transaction_test1()"
return 1
$$;
SELECT transaction_test3();
ERROR: invalid transaction termination
CONTEXT: while executing
"commit"
(procedure "__PLTcl_proc_transaction_test1" line 6)
invoked from within
"__PLTcl_proc_transaction_test1"
invoked from within
"spi_exec "CALL transaction_test1()""
(procedure "__PLTcl_proc_transaction_test3" line 3)
invoked from within
"__PLTcl_proc_transaction_test3"
in PL/Tcl function transaction_test3()
SELECT * FROM test1;
a | b
---+---
(0 rows)
-- commit inside cursor loop
CREATE TABLE test2 (x int);
INSERT INTO test2 VALUES (0), (1), (2), (3), (4);
TRUNCATE test1;
CREATE PROCEDURE transaction_test4a()
LANGUAGE pltcl
AS $$
spi_exec -array row "SELECT * FROM test2 ORDER BY x" {
spi_exec "INSERT INTO test1 (a) VALUES ($row(x))"
commit
}
$$;
CALL transaction_test4a();
ERROR: cannot commit while a subtransaction is active
CONTEXT: while executing
"commit"
invoked from within
"spi_exec -array row "SELECT * FROM test2 ORDER BY x" {
spi_exec "INSERT INTO test1 (a) VALUES ($row(x))"
commit
}"
(procedure "__PLTcl_proc_transaction_test4a" line 3)
invoked from within
"__PLTcl_proc_transaction_test4a"
in PL/Tcl function transaction_test4a()
SELECT * FROM test1;
a | b
---+---
(0 rows)
-- rollback inside cursor loop
TRUNCATE test1;
CREATE PROCEDURE transaction_test4b()
LANGUAGE pltcl
AS $$
spi_exec -array row "SELECT * FROM test2 ORDER BY x" {
spi_exec "INSERT INTO test1 (a) VALUES ($row(x))"
rollback
}
$$;
CALL transaction_test4b();
ERROR: cannot roll back while a subtransaction is active
CONTEXT: while executing
"rollback"
invoked from within
"spi_exec -array row "SELECT * FROM test2 ORDER BY x" {
spi_exec "INSERT INTO test1 (a) VALUES ($row(x))"
rollback
}"
(procedure "__PLTcl_proc_transaction_test4b" line 3)
invoked from within
"__PLTcl_proc_transaction_test4b"
in PL/Tcl function transaction_test4b()
SELECT * FROM test1;
a | b
---+---
(0 rows)
-- check handling of an error during COMMIT
CREATE TABLE testpk (id int PRIMARY KEY);
CREATE TABLE testfk(f1 int REFERENCES testpk DEFERRABLE INITIALLY DEFERRED);
CREATE PROCEDURE transaction_testfk()
LANGUAGE pltcl
AS $$
# this insert will fail during commit:
spi_exec "INSERT INTO testfk VALUES (0)"
commit
elog WARNING "should not get here"
$$;
CALL transaction_testfk();
ERROR: insert or update on table "testfk" violates foreign key constraint "testfk_f1_fkey"
CONTEXT: while executing
"commit"
(procedure "__PLTcl_proc_transaction_testfk" line 5)
invoked from within
"__PLTcl_proc_transaction_testfk"
in PL/Tcl function transaction_testfk()
SELECT * FROM testpk;
id
----
(0 rows)
SELECT * FROM testfk;
f1
----
(0 rows)
CREATE OR REPLACE PROCEDURE transaction_testfk()
LANGUAGE pltcl
AS $$
# this insert will fail during commit:
spi_exec "INSERT INTO testfk VALUES (0)"
if [catch {commit} msg] {
elog INFO $msg
}
# these inserts should work:
spi_exec "INSERT INTO testpk VALUES (1)"
spi_exec "INSERT INTO testfk VALUES (1)"
$$;
CALL transaction_testfk();
INFO: insert or update on table "testfk" violates foreign key constraint "testfk_f1_fkey"
SELECT * FROM testpk;
id
----
1
(1 row)
SELECT * FROM testfk;
f1
----
1
(1 row)
DROP TABLE test1;
DROP TABLE test2;
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