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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_chr">
<refmeta>
<refentrytitle>chr</refentrytitle>
<refmiscinfo>string</refmiscinfo>
</refmeta>
<refnamediv>
<refname>chr</refname>
<refpurpose>Convert a <type>long</type> character code to a character or wide character</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_chr">
<funcprototype id="fproto_chr">
<funcdef>varchar <function>chr</function></funcdef>
<paramdef>in <parameter>chr_code</parameter>long</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_chr"><title>Description</title>
<para><function>chr</function> returns a new one character long string
containing the character with character code given as parameter.</para>
</refsect1>
<refsect1 id="params_chr"><title>Parameters</title>
<refsect2><title><parameter>chr_code</parameter></title>
<para>The <type>LONG</type> character code value for the <type>character</type> or <type>wide character</type> to be produced.</para>
</refsect2>
</refsect1>
<refsect1 id="ret_chr"><title>Return Values</title>
<para>If the <parameter>chr_code</parameter> is smaller than or equal to 255, the returned 1 character string will be of type <type>VARCHAR</type>. Otherwise the returned type is <type>NVARCHAR</type>.</para>
</refsect1>
<refsect1 id="errors_chr"><title>Errors</title>
<table><title>Errors signalled by chr</title>
<tgroup cols="2">
<tbody>
<row>
<entry><errorcode></errorcode></entry>
<entry><errorname></errorname></entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1 id="examples_chr"><title>Examples</title>
<example id="ex_chr_1"><title>Simple example</title>
<screen>SQL> select chr (33);
callret
VARCHAR
_______________________________________________________________________________
!
1 Rows. -- 3 msec.
</screen>
</example>
<example id="ex_chr_2"><title>Stored procedure example</title>
<para>This stored procedure lists the ASCII values and characters in a string given as argument.</para>
<screen>
SQL> create procedure
test_chr (in str varchar)
{
declare pos integer; pos := 0;
declare c_code, c_code2 integer; declare c_char varchar;
result_names (c_code, c_code2, c_char);
while (pos < length (str))
{
result (aref (str, pos), ascii (subseq (str, pos, pos+1, 1)),
chr (aref (str, pos)));
pos := pos + 1;
}
}
;
Done. -- 7 msec.
SQL> test_chr ('Nebuchadnessar');
c_code c_code2 c_char
INTEGER NOT NULL INTEGER NOT NULL VARCHAR NOT NULL
_______________________________________________________________________________
78 78 N
101 101 e
98 98 b
117 117 u
99 99 c
104 104 h
97 97 a
100 100 d
110 110 n
101 101 e
115 115 s
115 115 s
97 97 a
114 114 r
14 Rows. -- 7 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso_chr"><title>See Also</title>
<para><link linkend="fn_aref"><function>aref</function></link>, <link linkend="fn_ascii"><function>ascii</function></link></para>
</refsect1>
</refentry>
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