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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
\set VERBOSITY terse
-- predictability
SET synchronous_commit = on;
SELECT 'init' FROM pg_create_logical_replication_slot('regression_slot', 'wal2json');
?column?
----------
init
(1 row)
SELECT 'msg1' FROM pg_logical_emit_message(true, 'wal2json', 'this is a\ message');
?column?
----------
msg1
(1 row)
SELECT 'msg2' FROM pg_logical_emit_message(false, 'wal2json', 'this is "another" message');
?column?
----------
msg2
(1 row)
SELECT 'msg3' FROM pg_logical_emit_message(false, 'wal2json', E'\\x546170697275732074657272657374726973'::bytea);
?column?
----------
msg3
(1 row)
SELECT 'msg4' FROM pg_logical_emit_message(false, 'wal2json', E'\\x5072696f646f6e746573206d6178696d7573'::bytea);
?column?
----------
msg4
(1 row)
SELECT 'msg5' FROM pg_logical_emit_message(false, 'wal2json', E'\\x436172796f6361722062726173696c69656e7365'::bytea);
?column?
----------
msg5
(1 row)
BEGIN;
SELECT 'msg6' FROM pg_logical_emit_message(true, 'wal2json', 'this message will not be printed');
?column?
----------
msg6
(1 row)
SELECT 'msg7' FROM pg_logical_emit_message(false, 'wal2json', 'this message will be printed even if the transaction is rollbacked');
?column?
----------
msg7
(1 row)
ROLLBACK;
BEGIN;
SELECT 'msg8' FROM pg_logical_emit_message(true, 'wal2json', 'this is message #1');
?column?
----------
msg8
(1 row)
SELECT 'msg9' FROM pg_logical_emit_message(false, 'wal2json', 'this message will be printed before message #1');
?column?
----------
msg9
(1 row)
SELECT 'msg10' FROM pg_logical_emit_message(true, 'wal2json', 'this is message #2');
?column?
----------
msg10
(1 row)
COMMIT;
SELECT 'msg11' FROM pg_logical_emit_message(true, 'filtered', 'this message will be filtered');
?column?
----------
msg11
(1 row)
SELECT 'msg12' FROM pg_logical_emit_message(true, 'added1', 'this message will be printed');
?column?
----------
msg12
(1 row)
SELECT 'msg13' FROM pg_logical_emit_message(true, 'added2', 'this message will be filtered');
?column?
----------
msg13
(1 row)
SELECT data FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'format-version', '1', 'pretty-print', '1', 'filter-msg-prefixes', 'foo, filtered, bar', 'add-msg-prefixes', 'added1, added3, wal2json');
data
---------------------------------------------------------------------------------------------------------
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": true, +
"prefix": "wal2json", +
"content": "this is a\\ message" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "this is \"another\" message" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "Tapirus terrestris" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "Priodontes maximus" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "Caryocar brasiliense" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "this message will be printed even if the transaction is rollbacked"+
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": false, +
"prefix": "wal2json", +
"content": "this message will be printed before message #1" +
} +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": true, +
"prefix": "wal2json", +
"content": "this is message #1" +
} +
,{ +
"kind": "message", +
"transactional": true, +
"prefix": "wal2json", +
"content": "this is message #2" +
} +
] +
}
{ +
"change": [ +
] +
}
{ +
"change": [ +
{ +
"kind": "message", +
"transactional": true, +
"prefix": "added1", +
"content": "this message will be printed" +
} +
] +
}
{ +
"change": [ +
] +
}
(11 rows)
SELECT data FROM pg_logical_slot_peek_changes('regression_slot', NULL, NULL, 'format-version', '2', 'filter-msg-prefixes', 'foo, filtered, bar', 'add-msg-prefixes', 'added1, added3, wal2json');
data
-----------------------------------------------------------------------------------------------------------------------------------------
{"action":"B"}
{"action":"M","transactional":true,"prefix":"wal2json","content":"this is a\\ message"}
{"action":"C"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"this is \"another\" message"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"Tapirus terrestris"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"Priodontes maximus"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"Caryocar brasiliense"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"this message will be printed even if the transaction is rollbacked"}
{"action":"M","transactional":false,"prefix":"wal2json","content":"this message will be printed before message #1"}
{"action":"B"}
{"action":"M","transactional":true,"prefix":"wal2json","content":"this is message #1"}
{"action":"M","transactional":true,"prefix":"wal2json","content":"this is message #2"}
{"action":"C"}
{"action":"B"}
{"action":"C"}
{"action":"B"}
{"action":"M","transactional":true,"prefix":"added1","content":"this message will be printed"}
{"action":"C"}
{"action":"B"}
{"action":"C"}
(20 rows)
SELECT 'stop' FROM pg_drop_replication_slot('regression_slot');
?column?
----------
stop
(1 row)
|
