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Since some preparation work had already been done, the only source changes left were changing empty-element tags like <xref linkend="foo"> to <xref linkend="foo"/>, and changing the DOCTYPE. The source files are still named *.sgml, but they are actually XML files now. Renaming could be considered later. In the build system, the intermediate step to convert from SGML to XML is removed. Everything is build straight from the source files again. The OpenSP (or the old SP) package is no longer needed. The documentation toolchain instructions are updated and are much simpler now. Peter Eisentraut, Alexander Lakhin, Jürgen Purtz
143 lines
4.1 KiB
Text
143 lines
4.1 KiB
Text
<!--
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doc/src/sgml/ref/alter_policy.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-alterpolicy">
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<indexterm zone="sql-alterpolicy">
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<primary>ALTER POLICY</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>ALTER POLICY</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>ALTER POLICY</refname>
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<refpurpose>change the definition of a row level security policy</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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ALTER POLICY <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable> RENAME TO <replaceable class="parameter">new_name</replaceable>
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ALTER POLICY <replaceable class="parameter">name</replaceable> ON <replaceable class="parameter">table_name</replaceable>
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[ TO { <replaceable class="parameter">role_name</replaceable> | PUBLIC | CURRENT_USER | SESSION_USER } [, ...] ]
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[ USING ( <replaceable class="parameter">using_expression</replaceable> ) ]
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[ WITH CHECK ( <replaceable class="parameter">check_expression</replaceable> ) ]
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>ALTER POLICY</command> changes the definition of an existing
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row-level security policy. Note that <command>ALTER POLICY</command>
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only allows the set of roles to which the policy applies and the
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<literal>USING</literal> and <literal>WITH CHECK</literal> expressions to
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be modified. To change other properties of a policy, such as the command
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to which it applies or whether it is permissive or restrictive, the policy
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must be dropped and recreated.
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</para>
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<para>
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To use <command>ALTER POLICY</command>, you must own the table that
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the policy applies to.
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</para>
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<para>
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In the second form of <command>ALTER POLICY</command>, the role list,
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<replaceable class="parameter">using_expression</replaceable>, and
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<replaceable class="parameter">check_expression</replaceable> are replaced
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independently if specified. When one of those clauses is omitted, the
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corresponding part of the policy is unchanged.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">name</replaceable></term>
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<listitem>
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<para>
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The name of an existing policy to alter.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">table_name</replaceable></term>
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<listitem>
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<para>
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The name (optionally schema-qualified) of the table that the
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policy is on.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">new_name</replaceable></term>
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<listitem>
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<para>
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The new name for the policy.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">role_name</replaceable></term>
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<listitem>
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<para>
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The role(s) to which the policy applies. Multiple roles can be
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specified at one time. To apply the policy to all roles,
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use <literal>PUBLIC</literal>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">using_expression</replaceable></term>
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<listitem>
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<para>
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The <literal>USING</literal> expression for the policy.
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See <xref linkend="sql-createpolicy"/> for details.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><replaceable class="parameter">check_expression</replaceable></term>
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<listitem>
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<para>
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The <literal>WITH CHECK</literal> expression for the policy.
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See <xref linkend="sql-createpolicy"/> for details.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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<command>ALTER POLICY</command> is a <productname>PostgreSQL</productname> extension.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createpolicy"/></member>
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<member><xref linkend="sql-droppolicy"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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