<para>

The <application>spi</> module provides several workable examples

of using SPI and triggers. While these functions are of some value in

of using the <link linkend="spi">Server Programming Interface</link>

(<acronym>SPI</acronym>) and triggers. While these functions are of

some value in

their own right, they are even more useful as examples to modify for

your own purposes. The functions are general enough to be used

with any table, but you have to specify table and field names (as described

have documented error-return conventions. Those conventions only apply

for errors detected within the SPI functions themselves, however.)

It is possible to recover control after an error by establishing your own

subtransaction surrounding SPI calls that might fail. This is not currently

documented because the mechanisms required are still in flux.

subtransaction surrounding SPI calls that might fail.

</para>

<para>