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Add more limited large object trigger example.

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Bruce Momjian 2012-08-14 23:25:20 -04:00
parent 9e84cccff2
commit 864de654c8
1 changed files with 2 additions and 7 deletions
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doc/src/sgml/lo.sgml
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@ -77,13 +77,8 @@ CREATE TRIGGER t_raster BEFORE UPDATE OR DELETE ON image
For each column that will contain unique references to large objects, For each column that will contain unique references to large objects,
create a <literal>BEFORE UPDATE OR DELETE</> trigger, and give the column create a <literal>BEFORE UPDATE OR DELETE</> trigger, and give the column
name as the sole trigger argument. You can also restrict the trigger name as the sole trigger argument. You can also restrict the trigger
to only execute on updates to the column with: to only execute on updates to the column by using <literal>BEFORE UPDATE
OF</literal> <replaceable class="parameter">column_name</replaceable>.
<programlisting>
CREATE TRIGGER t_raster BEFORE UPDATE OF raster OR DELETE ON image
FOR EACH ROW EXECUTE PROCEDURE lo_manage(raster);
</programlisting>
If you need multiple <type>lo</> If you need multiple <type>lo</>
columns in the same table, create a separate trigger for each one, columns in the same table, create a separate trigger for each one,
remembering to give a different name to each trigger on the same table. remembering to give a different name to each trigger on the same table.