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

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
  <refentry id="function.mysqli-select-db">
   <refnamediv>
    <refname>mysqli_select_db</refname>
    <refname>mysqli->select_db</refname>
    <refpurpose>Selects the default database for database queries</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>mysqli_select_db</methodname>
      <methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
      <methodparam><type>string</type><parameter>dbname</parameter></methodparam>
     </methodsynopsis>
    <para>
     The <function>mysqli_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>mysqli_connect</function>.
     </para>
    </note>
   </refsect1>
   <refsect1>
    &reftitle.returnvalues;
    <para>
     &return.success;
    </para>
   </refsect1>
   <refsect1>
    &reftitle.seealso;
    <para>
     <function>mysqli_connect</function>&listendand;
     <function>mysqli_real_connect</function>.
    </para>
   </refsect1>
   <refsect1>
    &reftitle.examples;
    <example>
     <title>Object oriented style</title>
     <programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

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

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);
    $result->close();
}

/* change db to world db */
$mysqli->select_db("world");

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
    $row = $result->fetch_row();
    printf("Default database is %s.\n", $row[0]);
    $result->close();
}

$mysqli->close();
?>
]]>
    </programlisting>
    </example>
    <example>
     <title>Procedural style</title>
     <programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");

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

/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
    $row = mysqli_fetch_row($result);
    printf("Default database is %s.\n", $row[0]);
    mysqli_free_result($result);
}

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

/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
    $row = mysqli_fetch_row($result);
    printf("Default database is %s.\n", $row[0]);
    mysqli_free_result($result);
}

mysqli_close($link);
?>
]]>
     </programlisting>
    </example>
    &example.outputs;
    <screen>
<![CDATA[
Default database is test.
Default database is world.
]]>
    </screen>
   </refsect1>
  </refentry>

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