mysqli::select_db

mysqli_select_db

(PHP 5)

mysqli_select_db — Selects the default database for database queries

Description

Object oriented style (method):

bool mysqli::select_db ( string $dbname )

Procedural style:

bool mysqli_select_db ( mysqli $link , string $dbname )

Selects the default database to be used when performing queries against the database connection.

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().

Parameters

link: Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()
dbname: The database name.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

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 example will output:

Default database is test.
Default database is world.