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体验新版 GitCode,发现更多精彩内容 >>
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7f85cac0
编写于
4月 18, 2000
作者:
T
Thomas G. Lockhart
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差异文件
Clean up description of SET CONSTRAINTS.
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07f60061
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doc/src/sgml/ref/set.sgml
doc/src/sgml/ref/set.sgml
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doc/src/sgml/ref/set.sgml
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7f85cac0
<!--
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.4
1 2000/04/14 23:12:29 momjian
Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.4
2 2000/04/18 15:23:34 thomas
Exp $
Postgres documentation
Postgres documentation
-->
-->
...
@@ -266,12 +266,14 @@ SELECT setseed(<replaceable>value</replaceable>);
...
@@ -266,12 +266,14 @@ SELECT setseed(<replaceable>value</replaceable>);
</varlistentry>
</varlistentry>
<varlistentry>
<varlistentry>
<term>CONSTRAINT</term>
<term>CONSTRAINT
S
</term>
<listitem>
<listitem>
<para>
<para>
SET CONSTRAINTS controls the frequency of foreign key
SET CONSTRAINTS affects the behavior of constraint evaluation
constratint checking in the current transaction. Allowed
in the current transaction.
parameters are:
SET CONSTRAINTS, specified
in SQL3, has these allowed parameters:
<variablelist>
<variablelist>
<varlistentry>
<varlistentry>
<term><replaceable class="parameter">constraintlist</replaceable></term>
<term><replaceable class="parameter">constraintlist</replaceable></term>
...
@@ -295,12 +297,19 @@ SELECT setseed(<replaceable>value</replaceable>);
...
@@ -295,12 +297,19 @@ SELECT setseed(<replaceable>value</replaceable>);
</para>
</para>
<para>
<para>
In <option>DEFERRED</option> mode, foreign key constraints
marked as <option>DEFERRABLE</option> are checked only at
transaction commit.
In <option>IMMEDIATE</option> mode, foreign key constraints
In <option>IMMEDIATE</option> mode, foreign key constraints
are checked at the end of each query.
are checked at the end of each query.
</para>
</para>
<para>
In <option>DEFERRED</option> mode, foreign key constraints
marked as <option>DEFERRABLE</option> are checked only at
transaction commit or until its mode is explicitly set to
<option>IMMEDIATE</option>.
This is actually only done for foreign key
constraints, so it does not apply to UNIQUE or other
constraints.
</para>
</listitem>
</listitem>
</varlistentry>
</varlistentry>
...
...
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