blob: f557b791386db7da73c30857b1f162bf09d0a98a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
-- suppress CONTEXT so that function OIDs aren't in output
\set VERBOSITY terse
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
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
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
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
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"
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;
|
