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Improve GRANT documentation to point out that UPDATE and DELETE typically

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require SELECT privilege as well, since you normally need to read existing
column values within such commands.  This behavior is according to spec,
but we'd never documented it before.  Per gripe from Volkan Yazici.
This commit is contained in:
Tom Lane 2008-05-28 00:45:40 +00:00
parent 7e8374a3e0
commit a8f98c068e
1 changed files with 27 additions and 13 deletions
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40
doc/src/sgml/ref/grant.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/ref/grant.sgml,v 1.68 2008/05/05 01:21:03 adunstan Exp $ $PostgreSQL: pgsql/doc/src/sgml/ref/grant.sgml,v 1.69 2008/05/28 00:45:40 tgl Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -135,10 +135,15 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>SELECT</term> <term>SELECT</term>
<listitem> <listitem>
<para> <para>
Allows <xref linkend="sql-select" endterm="sql-select-title"> from any column of the Allows <xref linkend="sql-select" endterm="sql-select-title"> from
specified table, view, or sequence. Also allows the use of any column of the specified table, view, or sequence.
<xref linkend="sql-copy" endterm="sql-copy-title"> TO. For sequences, this Also allows the use of
privilege also allows the use of the <function>currval</function> function. <xref linkend="sql-copy" endterm="sql-copy-title"> TO.
This privilege is also needed to reference existing column values in
<xref linkend="sql-update" endterm="sql-update-title"> or
<xref linkend="sql-delete" endterm="sql-delete-title">.
For sequences, this privilege also allows the use of the
<function>currval</function> function.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
@ -147,8 +152,9 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>INSERT</term> <term>INSERT</term>
<listitem> <listitem>
<para> <para>
Allows <xref linkend="sql-insert" endterm="sql-insert-title"> of a new row into the Allows <xref linkend="sql-insert" endterm="sql-insert-title"> of a new
specified table. Also allows <xref linkend="sql-copy" endterm="sql-copy-title"> FROM. row into the specified table.
Also allows <xref linkend="sql-copy" endterm="sql-copy-title"> FROM.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
@ -158,10 +164,15 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<listitem> <listitem>
<para> <para>
Allows <xref linkend="sql-update" endterm="sql-update-title"> of any Allows <xref linkend="sql-update" endterm="sql-update-title"> of any
column of the specified table. <literal>SELECT ... FOR UPDATE</literal> column of the specified table.
(In practice, any nontrivial <command>UPDATE</> command will require
<literal>SELECT</> privilege as well, since it must reference table
columns to determine which rows to update, and/or to compute new
values for columns.)
<literal>SELECT ... FOR UPDATE</literal>
and <literal>SELECT ... FOR SHARE</literal> and <literal>SELECT ... FOR SHARE</literal>
also require this privilege (besides the also require this privilege, in addition to the
<literal>SELECT</literal> privilege). For sequences, this <literal>SELECT</literal> privilege. For sequences, this
privilege allows the use of the <function>nextval</function> and privilege allows the use of the <function>nextval</function> and
<function>setval</function> functions. <function>setval</function> functions.
</para> </para>
@ -172,8 +183,11 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>DELETE</term> <term>DELETE</term>
<listitem> <listitem>
<para> <para>
Allows <xref linkend="sql-delete" endterm="sql-delete-title"> of a row from the Allows <xref linkend="sql-delete" endterm="sql-delete-title"> of a row
specified table. from the specified table.
(In practice, any nontrivial <command>DELETE</> command will require
<literal>SELECT</> privilege as well, since it must reference table
columns to determine which rows to delete.)
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
@ -235,7 +249,7 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>TEMP</term> <term>TEMP</term>
<listitem> <listitem>
<para> <para>
Allows temporary tables to be created while using the database. Allows temporary tables to be created while using the specified database.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>