php-doc-en/reference/maxdb/functions/maxdb-select-db.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.maxdb-select-db">
   <refnamediv>
    <refname>maxdb_select_db</refname>
    <refpurpose>Selects the default database for database queries</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>maxdb_select_db</methodname>
      <methodparam><type>resource</type><parameter>link</parameter></methodparam>
      <methodparam><type>string</type><parameter>dbname</parameter></methodparam>
     </methodsynopsis>
    <para>
     The <function>maxdb_select_db</function> function selects the default
     database (specified by the <parameter>dbname</parameter> parameter) to be 
     used when performing queries against the database connection 
     represented by the <parameter>link</parameter> parameter.
    </para>
    <note>
     <para>
      This function should only be used to change the default database for the connection. 
      You can select the default database with 4th parameter in <function>maxdb_connect</function>.
     </para>
    </note>
   </refsect1>
   <refsect1>
    <title>Return values</title>
    <para>
     &return.success;
    </para>
   </refsect1>
   <refsect1>
    <title>See also</title>
    <para>
     <function>maxdb_connect</function>
     <function>maxdb_real_connect</function>
    </para>
   </refsect1>
   <refsect1>
    <title>Example</title>
    <example>
     <title>Procedural style</title>
     <programlisting role="php">
<![CDATA[
<?php
$link = maxdb_connect("localhost", "MONA", "RED");

/* check connection */
if (maxdb_connect_errno()) {
   printf("Connect failed: %s\n", maxdb_connect_error());
   exit();
}

/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
   $row = maxdb_fetch_row($result);
   printf("Default database is %s.\n", $row[0]);
   maxdb_free_result($result);
}

/* change db to world db */
maxdb_select_db($link, "XXXXXXXX");

/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
   $row = maxdb_fetch_row($result);
   printf("Default database is %s.\n", $row[0]);
   maxdb_free_result($result);
}

maxdb_close($link);
?>
]]>
     </programlisting>
    </example>
    <para>
     The above examples would produce the following output:
    </para>
    <screen>
<![CDATA[
Default database is DB76.

Warning: maxdb_select_db(): -10709 Connection failed (RTE:database not running) <...>

Warning: maxdb_query(): -10821 Session not connected [] <...>

Warning: maxdb_close(): -10821 Session not connected [] <...>
]]>
    </screen>
   </refsect1>
  </refentry>

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