PHP Manual
Prev |  | Next

# mysqli_select_db

(PHP 5)

mysqli_select_db

(no version information, might be only in CVS)

mysqli->select_db -- Selects the default database for database queries

## Description

bool mysqli_select_db ( mysqli 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().

## Return Values

Returns `TRUE` on success or `FALSE` on failure.

## See Also

mysqli_connect() and mysqli_real_connect().

## 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.

Prev | Home | Next
mysqli_rpl_query_type | Up | mysqli_send_long_data