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Preliminary code review for domain CHECK constraints patch: add documentation,

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make VALUE a non-reserved word again, use less invasive method of passing
ConstraintTestValue into transformExpr, fix problems with nested constraint
testing, do correct thing with NULL result from a constraint expression,
remove memory leak.  Domain checks still need much more work if we are going
to allow ALTER DOMAIN, however.
This commit is contained in:
Tom Lane
2002-12-12 20:35:16 +00:00
parent ff7349694f
commit b0422b215c
28 changed files with 222 additions and 292 deletions
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23
doc/src/sgml/ref/create_domain.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.8 2002/11/21 23:34:43 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.9 2002/12/12 20:35:07 tgl Exp $
PostgreSQL documentation
-->
@ -30,7 +30,7 @@ CREATE DOMAIN <replaceable class="parameter">domainname</replaceable> [AS] <repl
where <replaceable class="PARAMETER">constraint</replaceable> is:
[ CONSTRAINT <replaceable class="PARAMETER">constraint_name</replaceable> ]
{ NOT NULL | NULL }
{ NOT NULL | NULL | CHECK (<replaceable class="PARAMETER">expression</replaceable>) }
</synopsis>
<refsect2 id="R2-SQL-CREATEDOMAIN-1">
@ -128,6 +128,25 @@ where <replaceable class="PARAMETER">constraint</replaceable> is:
</listitem>
</varlistentry>
<varlistentry>
<term><literal>CHECK (<replaceable class="PARAMETER">expression</replaceable>)</literal></term>
<listitem>
<para>
<literal>CHECK</> clauses specify integrity constraints or tests
which values of the domain must satisfy.
Each constraint must be an expression
producing a Boolean result. It should use the name <literal>VALUE</>
to refer to the value being tested.
</para>
<para>
Currently, <literal>CHECK</literal> expressions cannot contain
subselects nor refer to variables other than <literal>VALUE</>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>

3
doc/src/sgml/release.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.168 2002/11/26 22:04:03 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.169 2002/12/12 20:35:07 tgl Exp $
-->
<appendix id="release">
@ -24,6 +24,7 @@ CDATA means the content is "SGML-free", so you can write without
worries about funny characters.
-->
<literallayout><![CDATA[
Domains now support CHECK constraints
]]></literallayout>
</sect1>