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  • MySQL "show users"

     

    MySQL users FAQ: How do I show/list MySQL users, i.e., the user accounts in a MySQL database?

    To show/list the users in a MySQL database, first log into your MySQL server as an administrative user using the mysql client, then run this MySQL query:

    mysql> select * from mysql.user;
    

    However, note that this query shows a large listing of MySQL user information, including user permission information, so as a practical matter you may want to trim down some of the fields to display, something like this:

    mysql> select host, user, password from mysql.user;
    

    The next section provides details and background information about this second query.

    How to reduce the amount of ‘user’ information shown

    You can get a listing of the fields in the mysql.user table by running this MySQL query:

    mysql> desc mysql.user;
    

      

    On my current server this shows the following 37 columns of MySQL user information, as shown here:

    mysql> desc mysql.user;
    +-----------------------+-----------------------------------+------+-----+---------+-------+
    | Field                 | Type                              | Null | Key | Default | Extra |
    +-----------------------+-----------------------------------+------+-----+---------+-------+
    | Host                  | char(60)                          | NO   | PRI |         |       | 
    | User                  | char(16)                          | NO   | PRI |         |       | 
    | Password              | char(41)                          | NO   |     |         |       | 
    | Select_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Insert_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Update_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Delete_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Create_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Drop_priv             | enum('N','Y')                     | NO   |     | N       |       | 
    | Reload_priv           | enum('N','Y')                     | NO   |     | N       |       | 
    | Shutdown_priv         | enum('N','Y')                     | NO   |     | N       |       | 
    | Process_priv          | enum('N','Y')                     | NO   |     | N       |       | 
    | File_priv             | enum('N','Y')                     | NO   |     | N       |       | 
    | Grant_priv            | enum('N','Y')                     | NO   |     | N       |       | 
    | References_priv       | enum('N','Y')                     | NO   |     | N       |       | 
    | Index_priv            | enum('N','Y')                     | NO   |     | N       |       | 
    | Alter_priv            | enum('N','Y')                     | NO   |     | N       |       | 
    | Show_db_priv          | enum('N','Y')                     | NO   |     | N       |       | 
    | Super_priv            | enum('N','Y')                     | NO   |     | N       |       | 
    | Create_tmp_table_priv | enum('N','Y')                     | NO   |     | N       |       | 
    | Lock_tables_priv      | enum('N','Y')                     | NO   |     | N       |       | 
    | Execute_priv          | enum('N','Y')                     | NO   |     | N       |       | 
    | Repl_slave_priv       | enum('N','Y')                     | NO   |     | N       |       | 
    | Repl_client_priv      | enum('N','Y')                     | NO   |     | N       |       | 
    | Create_view_priv      | enum('N','Y')                     | NO   |     | N       |       | 
    | Show_view_priv        | enum('N','Y')                     | NO   |     | N       |       | 
    | Create_routine_priv   | enum('N','Y')                     | NO   |     | N       |       | 
    | Alter_routine_priv    | enum('N','Y')                     | NO   |     | N       |       | 
    | Create_user_priv      | enum('N','Y')                     | NO   |     | N       |       | 
    | ssl_type              | enum('','ANY','X509','SPECIFIED') | NO   |     |         |       | 
    | ssl_cipher            | blob                              | NO   |     | NULL    |       | 
    | x509_issuer           | blob                              | NO   |     | NULL    |       | 
    | x509_subject          | blob                              | NO   |     | NULL    |       | 
    | max_questions         | int(11) unsigned                  | NO   |     | 0       |       | 
    | max_updates           | int(11) unsigned                  | NO   |     | 0       |       | 
    | max_connections       | int(11) unsigned                  | NO   |     | 0       |       | 
    | max_user_connections  | int(11) unsigned                  | NO   |     | 0       |       | 
    +-----------------------+-----------------------------------+------+-----+---------+-------+
    37 rows in set (0.10 sec)
    

      

    So for most cases where you want to show MySQL user accounts you'll probably want to limit your MySQL users' query to a few important columns, something like this:

    select host, user, password from mysql.user;
    

      

    In summary, if you need to list the users in a MySQL database, I hope this has been helpful.

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  • 原文地址:https://www.cnblogs.com/hephec/p/4586869.html
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