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<?xml version="1.0" encoding="UTF-8"?>
<refentry version="5.0-subset Scilab" xml:id="mysql_errno" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mysql_errno</refname>
<refpurpose>Returns the last error number.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>result = mysql_errno(mysql)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>For the connection specified by mysql, <literal>mysql_errno</literal>
returns the error code for the most recently invoked API function that
can succeed or fail.</para>
<para>A return value of zero means that no error occurred.</para>
<para>Note that some functions like <literal>mysql_fetch_row</literal>
don't set <literal>mysql_errno</literal> if they succeed.</para>
<para>A rule of thumb is that all functions that have to ask the
server for information reset <literal>mysql_errno</literal> if they succeed.</para>
<para>MySQL-specific error numbers returned by <literal>mysql_errno</literal>
differ from <literal>SQLSTATE</literal> values returned by
<literal>mysql_sqlstate</literal>.</para>
<para>For example, the mysql client program displays errors using the
following format, where 1146 is the <literal>mysql_errno</literal>
value and '42S02' is the corresponding <literal>mysql_sqlstate</literal> value:</para>
<programlisting role="example">
shell> SELECT * FROM no_such_table;
ERROR 1146 (42S02): Table 'test.no_such_table' doesn't exist
</programlisting>
</refsection>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry>
<term>mysql</term>
<listitem>
<para>a MySQL pointer</para>
</listitem>
</varlistentry>
<varlistentry>
<term>result</term>
<listitem>
<para>An error code value for the last <literal>mysql_xxx</literal> call, if it failed.
zero means no error occurred. </para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
username = 'glpk'; // Put your username
password = 'gnu'; // Put your password
database = 'glpk';
port = 3306; // use netstat -a | grep mysql to locate the mysql port
// or ps -elf | grep mysql and locate --port
myhost = 'localhost'; // localhost most of the time
sql_ptr = mysql_init();
status = mysql_real_connect(sql_ptr, myhost, username, password, database, port);
status = mysql_select_db(sql_ptr,'mydatabase');
if (status) then
printf('Error message: %s, error number: %d\n', mysql_error(sql_ptr), mysql_errno(sql_ptr));
end
mysql_close(sql_ptr);
]]></programlisting>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member><link linkend="mysql_init">mysql_init</link></member>
<member><link linkend="mysql_real_connect">mysql_real_connect</link></member>
<member><link linkend="mysql_close">mysql_close</link></member>
<member><link linkend="mysql_select_db">mysql_select_db</link></member>
</simplelist>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Yann COLLETTE</member>
</simplelist>
</refsection>
</refentry>
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