PHP Reference

Description

bool mysqli_select_db ( object link, string dbname)

The mysqli_select_db() function selects the default database (specified by the dbname parameter) to be used when performing queries against the database connection represented by the link parameter.

Note: This function should only be used to change the default database for the connection. You can select the default database with 4th parameter in mysqli_connect().

Example

Example 1. Object oriented style


<?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();

?>

Example 2. Procedural style


<?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);

?>

The above examples would produce the following output:

Default database is test.
Default database is world.

mysqli_select_db

Description

Return values

See also

Example