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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
-->
@ -135,10 +135,15 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>SELECT</term>
<listitem>
<para>
Allows <xref linkend="sql-select" endterm="sql-select-title"> from any column of the
specified table, view, or sequence. Also allows the use of
<xref linkend="sql-copy" endterm="sql-copy-title"> TO. For sequences, this
privilege also allows the use of the <function>currval</function> function.
Allows <xref linkend="sql-select" endterm="sql-select-title"> from
any column of the specified table, view, or sequence.
Also allows the use of
<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>
</listitem>
</varlistentry>
@ -147,8 +152,9 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>INSERT</term>
<listitem>
<para>
Allows <xref linkend="sql-insert" endterm="sql-insert-title"> of a new row into the
specified table. Also allows <xref linkend="sql-copy" endterm="sql-copy-title"> FROM.
Allows <xref linkend="sql-insert" endterm="sql-insert-title"> of a new
row into the specified table.
Also allows <xref linkend="sql-copy" endterm="sql-copy-title"> FROM.
</para>
</listitem>
</varlistentry>
@ -158,10 +164,15 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<listitem>
<para>
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>
also require this privilege (besides the
<literal>SELECT</literal> privilege). For sequences, this
also require this privilege, in addition to the
<literal>SELECT</literal> privilege. For sequences, this
privilege allows the use of the <function>nextval</function> and
<function>setval</function> functions.
</para>
@ -172,8 +183,11 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>DELETE</term>
<listitem>
<para>
Allows <xref linkend="sql-delete" endterm="sql-delete-title"> of a row from the
specified table.
Allows <xref linkend="sql-delete" endterm="sql-delete-title"> of a row
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>
</listitem>
</varlistentry>
@ -235,7 +249,7 @@ GRANT <replaceable class="PARAMETER">role</replaceable> [, ...] TO <replaceable
<term>TEMP</term>
<listitem>
<para>
Allows temporary tables to be created while using the database.
Allows temporary tables to be created while using the specified database.
</para>
</listitem>
</varlistentry>