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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.
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- 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.
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- 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
-
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-->
<refentry id="fn_aset">
<refmeta>
<refentrytitle>aset</refentrytitle>
<refmiscinfo>array</refmiscinfo>
</refmeta>
<refnamediv>
<refname>aset</refname>
<refpurpose>set array element</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_aset">
<funcprototype id="fprot_aset">
<funcdef><function>aset</function></funcdef>
<paramdef>in <parameter>arg</parameter> any</paramdef>
<paramdef>in <parameter>nth</parameter> integer</paramdef>
<paramdef>in <parameter>new_elem</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_aset"><title>Description</title>
<para>aset sets the nth element of a string, array or vector where nth
is a zero-based index. If the first argument is a string, the nth
character of string is replaced with the ASCII value given in the third
argument elem.</para>
</refsect1>
<refsect1 id="params_aset"><title>Parameters</title>
<refsect2><title>arg</title>
<para>A string, array or vector.</para>
</refsect2>
<refsect2><title>nth</title>
<para>Zero-based element index.</para>
</refsect2>
<refsect2><title>nelem</title>
<para>The new element. If <parameter>arg</parameter> is a string,
its nth element will be replaced by the ASCII value given in
<parameter>new_elem</parameter>.</para>
</refsect2>
</refsect1>
<refsect1 id="ret_aset"><title>Return Values</title>
<para><function>Aset</function> returns
<parameter>nelem</parameter>. It modifies its first argument.</para>
</refsect1>
<refsect1 id="errors_aset"><title>Errors</title>
<table><title>Errors signalled by aset</title>
<tgroup cols="4">
<thead><row><entry>SQLState</entry><entry>Error Code</entry><entry>Error Text</entry><entry>Description</entry></row></thead>
<tbody>
<row>
<entry><errorcode>22003</errorcode></entry>
<entry><errorcode>SR020</errorcode></entry>
<entry><errorname>Bad array subscript %d in aset.</errorname></entry>
<entry></entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1 id="examples_aset"><title>Examples</title>
<example id="ex_aset_1">
<title>Using <function>make_string</function> and
<function>aref</function></title>
<para>Make a string, fill with character sequence from A to Z.</para>
<screen>
SQL> create procedure
alphabet_string ()
{
declare _inx integer;
declare _str varchar;
_str := make_string (26);
while (_inx < 26)
{
aset (_str, _inx, _inx + 65);
_inx := _inx + 1;
}
return (_str);
}
;
Done. -- 6 msec.
SQL> select alphabet_string ();
callret
VARCHAR NOT NULL
_______________________________________________________________________________
ABCDEFGHIJKLMNOPQRSTUVWXYZ
1 Rows. -- 4 msec.
</screen>
</example>
<example id="ex_aset_2"><title>Reverse a string using aset</title>
<para>Note that str is modified by aset.</para>
<screen>
SQL> create procedure
revstr (in str varchar)
{
declare len, inx1, inx2, tmp integer;
if (str is null) return (str);
len := length (str);
if (len < 2)
return (str); -- No need for further processing
inx1 := 0; -- Index from the left.
inx2 := len - 1; -- Index from the right.
len := len / 2; -- Upper limit for inx1.
while (inx1 < len)
{
tmp := aref (str, inx1);
aset (str, inx1, aref (str, inx2));
aset (str, inx2, tmp);
inx1 := inx1 + 1;
inx2 := inx2 - 1;
}
return (str);
}
;
Done. -- 7 msec.
SQL> select revstr ('repaid'), revstr ('Alli, tapa pulu papatilla!');
callret callret
VARCHAR VARCHAR
_______________________________________________________________________________
diaper !allitapap ulup apat ,illA
1 Rows. -- 11 msec.
</screen>
</example>
</refsect1>
<refsect1 id="seealso_aset"><title>See Also</title>
<para><link linkend="fn_aref"><function>aref()</function></link>,
<link linkend="fn_vector"><function>vector()</function></link>,
<link linkend="fn_make_string"><function>make_string()</function></link>
</para>
</refsect1>
</refentry>
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