22.9.3.3. mysql_change_user()

my_bool mysql_change_user(MYSQL *mysql, const char *user, const char *password, const char *db)

Description

Changes the user and causes the database specified by db to become the default (current) database on the connection specified by mysql. In subsequent queries, this database is the default for table references that do not include an explicit database specifier.

mysql_change_user() fails if the connected user cannot be authenticated or doesn't have permission to use the database. In this case, the user and database are not changed.

The db parameter may be set to NULL if you don't want to have a default database.

This command resets the state as if one had done a new connect. (See Section 22.9.12, “Controlling Automatic Reconnection Behavior”.) It always performs a ROLLBACK of any active transactions, closes and drops all temporary tables, and unlocks all locked tables. Session system variables are reset to the values of the corresponding global system variables. Prepared statements are released and HANDLER variables are closed. Locks acquired with GET_LOCK() are released. These effects occur even if the user didn't change.

Return Values

Zero for success. Nonzero if an error occurred.

Errors

The same that you can get from mysql_real_connect().

Example
if (mysql_change_user(&mysql, "user", "password", "new_database"))
{
   fprintf(stderr, "Failed to change user.  Error: %s\n",
           mysql_error(&mysql));
}
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