mysqli::select_db
, mysqli_select_db
mysqli::select_db
mysqli_select_db
Selects the default database for database queries
Description
Object oriented stylebool mysqli::select_db(string dbname);
Procedural stylebool 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
ormysqli_init
dbname
-
The database name.
Return Values
Returns TRUE
on success or FALSE
on failure.
Examples
Example 20.134. mysqli::select_db
example
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(); ?>
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 will output:
Default database is test. Default database is world.
See Also
mysqli_connect
|
mysqli_real_connect |