Documentation Home
MySQL 5.6 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 31.2Mb
PDF (A4) - 31.2Mb
PDF (RPM) - 29.4Mb
HTML Download (TGZ) - 7.3Mb
HTML Download (Zip) - 7.3Mb
HTML Download (RPM) - 6.2Mb
Man Pages (TGZ) - 179.0Kb
Man Pages (Zip) - 289.5Kb
Info (Gzip) - 3.0Mb
Info (Zip) - 3.0Mb
Excerpts from this Manual mysql_change_user()

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


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 include no explicit database specifier.

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

Pass a db parameter of NULL if you do not want to have a default database.

This function resets the session state as if one had done a new connect and reauthenticated. (See Section 23.8.20, “C API Automatic Reconnection Control”.) 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 did not change.

Return Values

Zero for success. Nonzero if an error occurred.


The same that you can get from mysql_real_connect(), plus:

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