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mysqli::change_user

mysqli_change_user

(PHP 5, PHP 7)

mysqli::change_user -- mysqli_change_userChanges the user of the specified database connection

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Description

Object oriented style

mysqli::change_user ( string $user , string $password , string $database ) : bool

Procedural style

mysqli_change_user ( mysqli $link , string $user , string $password , string $database ) : bool

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.

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Parameters

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

user

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 the mysqli_select_db() function.

PHP: mysqli::change_user - Manual Home of Manuel PHP  Contents Haut

Return Values

Returns TRUE on success or FALSE on failure.

PHP: mysqli::change_user - Manual Home of Manuel PHP  Contents Haut

Notes

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.

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Examples

Example #1 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

PHP: mysqli::change_user - Manual Home of Manuel PHP  Contents Haut

See Also

Find a PHP function

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-mysqli.change-user.html

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References

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