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Fix plperl and pltcl error handling per my previous proposal. SPI

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operations are now run as subtransactions, so that errors in them
can be reported as ordinary Perl or Tcl errors and caught by the
normal error handling convention of those languages.  Also do some
minor code cleanup in pltcl.c: extract a large chunk of duplicated
code in pltcl_SPI_execute and pltcl_SPI_execute_plan into a shared
subroutine.
This commit is contained in:
Tom Lane
2004-11-21 21:17:07 +00:00
parent a3b663dfea
commit 35f4994133
8 changed files with 410 additions and 396 deletions
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26
doc/src/sgml/pltcl.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/pltcl.sgml,v 2.31 2004/09/20 22:48:25 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/pltcl.sgml,v 2.32 2004/11/21 21:17:02 tgl Exp $
-->
<chapter id="pltcl">
@@ -449,17 +449,19 @@ SELECT 'doesn''t' AS ret
<term><function>elog</> <replaceable>level</replaceable> <replaceable>msg</replaceable></term>
<listitem>
<para>
Emits a log or error message. Possible levels are
<literal>DEBUG</>, <literal>LOG</>, <literal>INFO</>,
<literal>NOTICE</>, <literal>WARNING</>, <literal>ERROR</>, and
<literal>FATAL</>. Most simply emit the given message just like
the <literal>elog</> C function. <literal>ERROR</>
raises an error condition: further execution of the function is
abandoned, and the current transaction is aborted.
<literal>FATAL</> aborts the transaction and causes the current
session to shut down. (There is probably no good reason to use
this error level in PL/Tcl functions, but it's provided for
completeness.)
Emits a log or error message. Possible levels are
<literal>DEBUG</>, <literal>LOG</>, <literal>INFO</>,
<literal>NOTICE</>, <literal>WARNING</>, <literal>ERROR</>, and
<literal>FATAL</>. Most simply emit the given message just like
the <literal>elog</> C function. <literal>ERROR</>
raises an error condition; if this is not trapped by the surrounding
Tcl code, the error propagates out to the calling query, causing
the current transaction or subtransaction to be aborted. This
is effectively the same as the Tcl <literal>error</> command.
<literal>FATAL</> aborts the transaction and causes the current
session to shut down. (There is probably no good reason to use
this error level in PL/Tcl functions, but it's provided for
completeness.)
</para>
</listitem>
</varlistentry>