(PHP 5, PHP 7, PHP 8)
mysqli::select_db — mysqli_select_db — Selects the default database for database queries
Description
Object-oriented style
Procedural style
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().
Return Values
Returns true on success or false on failure.
Examples
Example #1 mysqli::select_db() example
mysqli_report
(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli(“localhost”, “my_user”, “my_password”, “test”);/* get the name of the current default database */
$result = $mysqli->query(“SELECT DATABASE()”);
$row = $result->fetch_row();
printf(“Default database is %s.n”, $row[0]);/* change default database to “world” */
$mysqli->select_db(“world”);/* get the name of the current default database */
$result = $mysqli->query(“SELECT DATABASE()”);
$row = $result->fetch_row();
printf(“Default database is %s.n”, $row[0]); mysqli_report
(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect(“localhost”, “my_user”, “my_password”, “test”);/* get the name of the current default database */
$result = mysqli_query($link, “SELECT DATABASE()”);
$row = mysqli_fetch_row($result);
printf(“Default database is %s.n”, $row[0]);/* change default database to “world” */
mysqli_select_db($link, “world”);/* get the name of the current default database */
$result = mysqli_query($link, “SELECT DATABASE()”);
$row = mysqli_fetch_row($result);
printf(“Default database is %s.n”, $row[0]);
The above examples will output:
Default database is test. Default database is world.