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Doc: add example of transition table use in a trigger.

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I noticed that there were exactly no complete examples of use of
a transition table in a trigger function, and no clear description
of just how you'd do it either.  Improve that.
This commit is contained in:
Tom Lane
2017-09-16 15:31:26 -04:00
parent 0f79440fb0
commit 936df5ba80
2 changed files with 81 additions and 3 deletions
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6
doc/src/sgml/trigger.sgml
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@@ -317,9 +317,11 @@
be created to make the sets of affected rows available to the trigger.
<literal>AFTER ROW</> triggers can also request transition tables, so
that they can see the total changes in the table as well as the change in
the individual row they are currently being fired for. The syntax for
the individual row they are currently being fired for. The method for
examining the transition tables again depends on the programming language
that is being used.
that is being used, but the typical approach is to make the transition
tables act like read-only temporary tables that can be accessed by SQL
commands issued within the trigger function.
</para>
</sect1>