Copyright 1997-2022 the PHP Documentation Group.
mysqli::change_user
mysqli_change_user
Changes the user of the specified database connection
Description
Object-oriented style
public bool mysqli::change_user(string username,
string password,
string|null database);
Procedural style
bool mysqli_change_user(mysqli mysql,
string username,
string password,
string|null database);
Changes the user of the specified database connection and sets the current database.
In order to successfully change users a valid
username
and
password
parameters must be provided and
that user must have sufficient permissions to access the desired
database. If for any reason authorization fails, the current
user authentication will remain.
Parameters
-
mysql
Procedural style only: A
mysqli
object returned bymysqli_connect
ormysqli_init
-
username
The MySQL user name.
-
password
The MySQL password.
-
database
The database to change to.
If desired, the
null
value may be passed resulting in only changing the user and not selecting a database. To select a database in this case use themysqli_select_db
function.
Return Values
Returns true
on success or
false
on failure.
Examples
Example 3.32 mysqli::change_user
example
Object-oriented style
<?php
/* connect database test */
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
$mysqli->query("SET @a:=1");
/* reset all and select a new database */
$mysqli->change_user("my_user", "my_password", "world");
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result->close();
}
if ($result = $mysqli->query("SELECT @a")) {
$row = $result->fetch_row();
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
$result->close();
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
/* connect database test */
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
mysqli_query($link, "SET @a:=1");
/* reset all and select a new database */
mysqli_change_user($link, "my_user", "my_password", "world");
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT @a")) {
$row = mysqli_fetch_row($result);
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
Default database: world Value of variable a is NULL
Notes
Using this command will always cause the current database connection to behave as if was a completely new database connection, regardless of if the operation was completed successfully. This reset includes performing a rollback on any active transactions, closing all temporary tables, and unlocking all locked tables.
See Also
mysqli_connect
|
mysqli_select_db
|