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<?xml version="1.0" encoding="ISO-8859-1"?>
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- 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
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-->
<refentry id="fn_vector">
<refmeta>
<refentrytitle>vector</refentrytitle>
<refmiscinfo>array</refmiscinfo>
</refmeta>
<refnamediv>
<refname>vector</refname>
<refpurpose>make a vector</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_vector">
<funcprototype id="fproto_vector">
<funcdef><function>vector</function></funcdef>
<paramdef><parameter>elem1</parameter> any</paramdef>
<paramdef><parameter>elem2</parameter> any</paramdef>
<paramdef><parameter>...</parameter> </paramdef>
<paramdef><parameter>elem-n</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_vector">
<title>Description</title>
<para><function>vector</function> returns a new vector (one-dimensional array) constructed from the given arguments.</para>
</refsect1>
<refsect1 id="params_vector"><title>Parameters</title>
<refsect2><title><parameter>elem1..n</parameter></title>
<para>Values of any types (not necessarily of one and the same type).
</para>
</refsect2>
</refsect1>
<refsect1 id="ret_vector"><title>Return Values</title>
<para>A vector (heterogeneous array) of as many elements as there
were arguments containing copies of the arguments.</para>
</refsect1>
<refsect1 id="examples_vector"><title>Examples</title>
<example id="ex_vector_1"><title>Inspecting a vector with dbg_obj_print</title>
<para>SQL clients can not process vectors directly so the simplest way to look at the content of a vector is to print it no server's console.</para>
<screen>
dbg_obj_print (vector (1, 2.34, 'A string', atof('3.14')))
</screen>
</example>
<example id="ex_vector_2"><title>Pretty-print function for vectors</title>
<para>The following function gets a heterogeneous vector of strings, nubers and other vectors and returns a string that is an SQL expression that will return a copy of a given vector.</para>
<screen><![CDATA[create procedure DUMP_VEC_IMPL (inout _vec any, inout _ses any)
{
declare _len, _ctr integer;
if (193 <> __tag (_vec))
{
if (isstring (_vec))
http (WS.WS.STR_SQL_APOS (_vec), _ses);
else
http (cast (_vec as varchar), _ses);
return;
}
_len := length (_vec);
_ctr := 0;
http ('\nvector (', _ses);
while (_ctr < _len)
{
if (_ctr > 0)
http (', ', _ses);
DUMP_VEC_IMPL (_vec[_ctr], _ses);
_ctr := _ctr+1;
}
http (')', _ses);
}
create function DUMP_VEC (in _vec any)
{
declare _ses any;
_ses := string_output();
DUMP_VEC_IMPL (_vec, _ses);
return string_output_string (_ses);
}
select DUMP_VEC (vector ('abc', 1, vector (3.1415), vector ()));
callret
VARCHAR
_______________________________________________________________________________
vector ('abc', 1,
vector (3.1415),
vector ())
1 Rows.
]]></screen>
</example>
</refsect1>
<refsect1 id="seealso_vector"><title>See Also</title>
<para>
<link linkend="fn_aset"><function>aset</function></link>
<link linkend="fn_aref"><function>aref</function></link>
<link linkend="fn_vector_concat"><function>vector_concat</function></link>
</para>
</refsect1>
</refentry>
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