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
|
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>37.57. triggers</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="infoschema-triggered-update-columns.html" title="37.56. triggered_update_columns" /><link rel="next" href="infoschema-udt-privileges.html" title="37.58. udt_privileges" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">37.57. <code class="literal">triggers</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-triggered-update-columns.html" title="37.56. triggered_update_columns">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 37. The Information Schema</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="infoschema-udt-privileges.html" title="37.58. udt_privileges">Next</a></td></tr></table><hr /></div><div class="sect1" id="INFOSCHEMA-TRIGGERS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.57. <code class="literal">triggers</code> <a href="#INFOSCHEMA-TRIGGERS" class="id_link">#</a></h2></div></div></div><p>
The view <code class="literal">triggers</code> contains all triggers defined
in the current database on tables and views that the current user owns
or has some privilege other than <code class="literal">SELECT</code> on.
</p><div class="table" id="id-1.7.6.61.3"><p class="title"><strong>Table 37.55. <code class="structname">triggers</code> Columns</strong></p><div class="table-contents"><table class="table" summary="triggers Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trigger_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database that contains the trigger (always the current database)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trigger_schema</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the schema that contains the trigger
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trigger_name</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the trigger
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">event_manipulation</code> <code class="type">character_data</code>
</p>
<p>
Event that fires the trigger (<code class="literal">INSERT</code>,
<code class="literal">UPDATE</code>, or <code class="literal">DELETE</code>)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">event_object_catalog</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the database that contains the table that the trigger
is defined on (always the current database)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">event_object_schema</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the schema that contains the table that the trigger is defined on
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">event_object_table</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the table that the trigger is defined on
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_order</code> <code class="type">cardinal_number</code>
</p>
<p>
Firing order among triggers on the same table having the same
<code class="literal">event_manipulation</code>,
<code class="literal">action_timing</code>, and
<code class="literal">action_orientation</code>. In
<span class="productname">PostgreSQL</span>, triggers are fired in name
order, so this column reflects that.
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_condition</code> <code class="type">character_data</code>
</p>
<p>
<code class="literal">WHEN</code> condition of the trigger, null if none
(also null if the table is not owned by a currently enabled
role)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_statement</code> <code class="type">character_data</code>
</p>
<p>
Statement that is executed by the trigger (currently always
<code class="literal">EXECUTE FUNCTION
<em class="replaceable"><code>function</code></em>(...)</code>)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_orientation</code> <code class="type">character_data</code>
</p>
<p>
Identifies whether the trigger fires once for each processed
row or once for each statement (<code class="literal">ROW</code> or
<code class="literal">STATEMENT</code>)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_timing</code> <code class="type">character_data</code>
</p>
<p>
Time at which the trigger fires (<code class="literal">BEFORE</code>,
<code class="literal">AFTER</code>, or <code class="literal">INSTEAD OF</code>)
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_reference_old_table</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the <span class="quote">“<span class="quote">old</span>”</span> transition table, or null if none
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_reference_new_table</code> <code class="type">sql_identifier</code>
</p>
<p>
Name of the <span class="quote">“<span class="quote">new</span>”</span> transition table, or null if none
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_reference_old_row</code> <code class="type">sql_identifier</code>
</p>
<p>
Applies to a feature not available in <span class="productname">PostgreSQL</span>
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">action_reference_new_row</code> <code class="type">sql_identifier</code>
</p>
<p>
Applies to a feature not available in <span class="productname">PostgreSQL</span>
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">created</code> <code class="type">time_stamp</code>
</p>
<p>
Applies to a feature not available in <span class="productname">PostgreSQL</span>
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
Triggers in <span class="productname">PostgreSQL</span> have two
incompatibilities with the SQL standard that affect the
representation in the information schema. First, trigger names are
local to each table in <span class="productname">PostgreSQL</span>, rather
than being independent schema objects. Therefore there can be duplicate
trigger names defined in one schema, so long as they belong to
different tables. (<code class="literal">trigger_catalog</code> and
<code class="literal">trigger_schema</code> are really the values pertaining
to the table that the trigger is defined on.) Second, triggers can
be defined to fire on multiple events in
<span class="productname">PostgreSQL</span> (e.g., <code class="literal">ON INSERT OR
UPDATE</code>), whereas the SQL standard only allows one. If a
trigger is defined to fire on multiple events, it is represented as
multiple rows in the information schema, one for each type of
event. As a consequence of these two issues, the primary key of
the view <code class="literal">triggers</code> is really
<code class="literal">(trigger_catalog, trigger_schema, event_object_table,
trigger_name, event_manipulation)</code> instead of
<code class="literal">(trigger_catalog, trigger_schema, trigger_name)</code>,
which is what the SQL standard specifies. Nonetheless, if you
define your triggers in a manner that conforms with the SQL
standard (trigger names unique in the schema and only one event
type per trigger), this will not affect you.
</p><div class="note"><h3 class="title">Note</h3><p>
Prior to <span class="productname">PostgreSQL</span> 9.1, this view's columns
<code class="structfield">action_timing</code>,
<code class="structfield">action_reference_old_table</code>,
<code class="structfield">action_reference_new_table</code>,
<code class="structfield">action_reference_old_row</code>, and
<code class="structfield">action_reference_new_row</code>
were named
<code class="structfield">condition_timing</code>,
<code class="structfield">condition_reference_old_table</code>,
<code class="structfield">condition_reference_new_table</code>,
<code class="structfield">condition_reference_old_row</code>, and
<code class="structfield">condition_reference_new_row</code>
respectively.
That was how they were named in the SQL:1999 standard.
The new naming conforms to SQL:2003 and later.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="infoschema-triggered-update-columns.html" title="37.56. triggered_update_columns">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="infoschema-udt-privileges.html" title="37.58. udt_privileges">Next</a></td></tr><tr><td width="40%" align="left" valign="top">37.56. <code class="literal">triggered_update_columns</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 16.2 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 37.58. <code class="literal">udt_privileges</code></td></tr></table></div></body></html>
|
