MYSQLI_SELECT_DB(3) 1 MYSQLI_SELECT_DB(3)
mysqli::select_db - Selects the default database for database queries
Object oriented style
SYNOPSIS
bool mysqli::select_db (string $dbname)
DESCRIPTION
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(3).
PARAMETERS
o $
link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3)
o $dbname
- The database name.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
mysqli::select_db example
Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s
", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.
", $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.
", $row[0]);
$result->close();
}
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s
", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.
", $row[0]);
mysqli_free_result($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.
", $row[0]);
mysqli_free_result($result);
}
mysqli_close($link);
?>
The above examples will output:
Default database is test.
Default database is world.
SEE ALSO
mysqli_connect(3), mysqli_real_connect(3).
PHP Documentation Group MYSQLI_SELECT_DB(3)
