<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<chapter xml:id="dba.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.examples;
 <section xml:id="dba.example">
  <title>Basic usage</title>
   <para>
    <example>
     <title>DBA example</title>
     <programlisting role="php">
<![CDATA[
<?php

$id = dba_open("/tmp/test.db", "n", "db2");

if (!$id) {
    echo "dba_open failed\n";
    exit;
}

dba_replace("key", "This is an example!", $id);

if (dba_exists("key", $id)) {
    echo dba_fetch("key", $id);
    dba_delete("key", $id);
}

dba_close($id);
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   DBA is binary safe and does not have any arbitrary limits.
   However, it inherits all limits set by the underlying
   database implementation.
  </para>
  <para>
   All file-based databases must provide a way of setting the file
   mode of a new created database, if that is possible at all. The
   file mode is commonly passed as the fourth argument to
   <function>dba_open</function> or <function>dba_popen</function>.
  </para>
  <para>
   You can access all entries of a database in a linear way by using the
   <function>dba_firstkey</function> and <function>dba_nextkey</function>
   functions. You may not change the database while traversing it.
  </para> 
  <para>
   <example>
    <title>Traversing a database</title>
    <programlisting role="php">
<![CDATA[
<?php

// ...open database...

$key = dba_firstkey($id);

while ($key !== false) {
    if (true) {          // remember the key to perform some action later
        $handle_later[] = $key;
    }
    $key = dba_nextkey($id);
}

foreach ($handle_later as $val) {
    dba_delete($val, $id);
}

?>
]]>
    </programlisting>
   </example>
  </para>
 </section>
</chapter>

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