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Document get/set bit/byte functions.

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This commit is contained in:
Bruce Momjian
2002-12-05 04:38:30 +00:00
parent 7816c7cb94
commit 23e88e25d6
2 changed files with 60 additions and 7 deletions
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57
doc/src/sgml/func.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.132 2002/11/23 04:04:43 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.133 2002/12/05 04:38:29 momjian Exp $
PostgreSQL documentation
-->
@@ -473,7 +473,8 @@ PostgreSQL documentation
shown in <xref linkend="functions-math-bit-table">.
Bit string arguments to <literal>&</literal>, <literal>|</literal>,
and <literal>#</literal> must be of equal length. When bit
shifting, the original length of the string is preserved, as shown in the table.
shifting, the original length of the string is preserved, as shown
in the table.
</para>
<table id="functions-math-bit-table">
@@ -2120,6 +2121,58 @@ PostgreSQL documentation
<entry><literal>trim('\\000'::bytea from '\\000Tom\\000'::bytea)</literal></entry>
<entry><literal>Tom</literal></entry>
</row>
<row>
<entry><function>get_byte</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
<entry><type>integer</type></entry>
<entry>
Extract byte from string.
<indexterm>
<primary>get_byte</primary>
</indexterm>
</entry>
<entry><literal>get_byte('Th\\000omas'::bytea, 4)</literal></entry>
<entry><literal>109</literal></entry>
</row>
<row>
<entry><function>set_byte</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
<entry><type>bytea</type></entry>
<entry>
Set byte in string.
<indexterm>
<primary>set_byte</primary>
</indexterm>
</entry>
<entry><literal>set_byte('Th\\000omas'::bytea, 4, 64)</literal></entry>
<entry><literal>Th\000o@as</literal></entry>
</row>
<row>
<entry><function>get_bit</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
<entry><type>integer</type></entry>
<entry>
Extract bit from string.
<indexterm>
<primary>get_bit</primary>
</indexterm>
</entry>
<entry><literal>get_bit('Th\\000omas'::bytea, 45)</literal></entry>
<entry><literal>1</literal></entry>
</row>
<row>
<entry><function>set_bit</function>(<parameter>string</parameter>, <parameter>offset</parameter>)</entry>
<entry><type>bytea</type></entry>
<entry>
Set bit in string.
<indexterm>
<primary>set_bit</primary>
</indexterm>
</entry>
<entry><literal>set_bit('Th\\000omas'::bytea, 45, 0)</literal></entry>
<entry><literal>Th\000omAs</literal></entry>
</row>
</tbody>
</tgroup>
</table>