147 lines
3.9 KiB
Plaintext
147 lines
3.9 KiB
Plaintext
<!--
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doc/src/sgml/ref/alter_trigger.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-altertrigger">
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<indexterm zone="sql-altertrigger">
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<primary>ALTER TRIGGER</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>ALTER TRIGGER</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>ALTER TRIGGER</refname>
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<refpurpose>change the definition of a trigger</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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ALTER TRIGGER <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
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ALTER TRIGGER <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> [ NO ] DEPENDS ON EXTENSION <replaceable class="parameter">extension_name</replaceable>
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>ALTER TRIGGER</command> changes properties of an existing
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trigger.
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</para>
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<para>
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The <literal>RENAME</literal> clause changes the name of
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the given trigger without otherwise changing the trigger
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definition.
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If the table that the trigger is on is a partitioned table,
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then corresponding clone triggers in the partitions are
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renamed too.
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</para>
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<para>
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The <literal>DEPENDS ON EXTENSION</literal> clause marks
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the trigger as dependent on an extension, such that if the extension is
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dropped, the trigger will automatically be dropped as well.
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</para>
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<para>
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You must own the table on which the trigger acts to be allowed to change its properties.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name of an existing trigger to alter.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">table_name</replaceable></term>
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<listitem>
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<para>
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The name of the table on which this trigger acts.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_name</replaceable></term>
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<listitem>
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<para>
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The new name for the trigger.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">extension_name</replaceable></term>
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<listitem>
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<para>
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The name of the extension that the trigger is to depend on (or no longer
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dependent on, if <literal>NO</literal> is specified). A trigger
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that's marked as dependent on an extension is automatically dropped when
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the extension is dropped.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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The ability to temporarily enable or disable a trigger is provided by
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<link linkend="sql-altertable"><command>ALTER TABLE</command></link>, not by
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<command>ALTER TRIGGER</command>, because <command>ALTER TRIGGER</command> has no
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convenient way to express the option of enabling or disabling all of
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a table's triggers at once.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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To rename an existing trigger:
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<programlisting>
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ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
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</programlisting></para>
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<para>
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To mark a trigger as being dependent on an extension:
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<programlisting>
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ALTER TRIGGER emp_stamp ON emp DEPENDS ON EXTENSION emplib;
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</programlisting></para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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<command>ALTER TRIGGER</command> is a <productname>PostgreSQL</productname>
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extension of the SQL standard.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-altertable"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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