mysqli::change_user
mysqli_change_user
(PHP 5, PHP 7)
mysqli::change_user -- mysqli_change_user — Changes the user of the specified database connection
설명
객체 기반 형식
$user
, string $password
, string $database
)절차식 형식
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.
인수
-
link -
순차 형식 전용: mysqli_connect()나 mysqli_init()가 반환한 연결 식별자.
-
user -
The MySQL user name.
-
password -
The MySQL password.
-
database -
The database to change to.
If desired, the
NULLvalue may be passed resulting in only changing the user and not selecting a database. To select a database in this case use the mysqli_select_db() function.
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
주의
Note:
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.
예제
Example #1 mysqli::change_user() example
객체 기반 형식
<?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();
?>
절차식 형식
<?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);
?>
위 예제들의 출력:
Default database: world Value of variable a is NULL
참고
- mysqli_connect() - 별칭: mysqli::__construct
- mysqli_select_db() - Selects the default database for database queries
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