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Commands such as ALTER USER, ALTER GROUP, ALTER ROLE, GRANT, and the various ALTER OBJECT / OWNER TO, as well as ad-hoc clauses related to roles such as the AUTHORIZATION clause of CREATE SCHEMA, the FOR clause of CREATE USER MAPPING, and the FOR ROLE clause of ALTER DEFAULT PRIVILEGES can now take the keywords CURRENT_USER and SESSION_USER as user specifiers in place of an explicit user name. This commit also fixes some quite ugly handling of special standards- mandated syntax in CREATE USER MAPPING, which in particular would fail to work in presence of a role named "current_user". The special role specifiers PUBLIC and NONE also have more consistent handling now. Also take the opportunity to add location tracking to user specifiers. Authors: Kyotaro Horiguchi. Heavily reworked by Álvaro Herrera. Reviewed by: Rushabh Lathia, Adam Brightwell, Marti Raudsepp.
81 lines
1.8 KiB
Plaintext
81 lines
1.8 KiB
Plaintext
<!--
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doc/src/sgml/ref/alter_large_object.sgml
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PostgreSQL documentation
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-->
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<refentry id="SQL-ALTERLARGEOBJECT">
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<indexterm zone="sql-alterlargeobject">
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<primary>ALTER LARGE OBJECT</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>ALTER LARGE OBJECT</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 LARGE OBJECT</refname>
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<refpurpose>change the definition of a large object</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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ALTER LARGE OBJECT <replaceable class="PARAMETER">large_object_oid</replaceable> { OWNER TO <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
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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 LARGE OBJECT</command> changes the definition of a
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large object. The only functionality is to assign a new owner.
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You must be superuser or owner of the large object to use
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<command>ALTER LARGE OBJECT</command>.
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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>large_object_oid</replaceable></term>
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<listitem>
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<para>
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OID of the large object to be altered
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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>new_owner</replaceable></term>
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<listitem>
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<para>
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The new owner of the large object
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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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There is no <command>ALTER LARGE OBJECT</command> statement in the SQL
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standard.
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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="largeobjects"></member>
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</simplelist>
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</refsect1>
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</refentry>
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