不登录到MySQL执行SQL语句

一般来讲，我们在MySQL中执行查询都是进入到mysql中执行的，比如通过命令登录：

$ mysql -u root -p

$ mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.7.17-0ubuntu0.16.04.1 (Ubuntu)

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

然后再敲命令做查询，那么能不能直接就在终端或者命令行执行查询呢，答案是肯定的，只需要多加一个e参数即可：

$ mysql -u root -p -e "SHOW DATABASES"

$ mysql -u root -p -e "SHOW DATABASES"
Enter password: 
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+

再做一个SELECT语句看看：

$ mysql -u root -p -e "SELECT * FROM user \G" mysql

$ mysql -u root -p -e "SELECT * FROM user \G" mysql
Enter password: 
*************************** 1. row ***************************
                  Host: localhost
                  User: root
           Select_priv: Y
           Insert_priv: Y
           Update_priv: Y
           Delete_priv: Y
           Create_priv: Y
             Drop_priv: Y
           Reload_priv: Y
         Shutdown_priv: Y
          Process_priv: Y
             File_priv: Y
            Grant_priv: Y
       References_priv: Y
            Index_priv: Y
            Alter_priv: Y
          Show_db_priv: Y
            Super_priv: Y
 Create_tmp_table_priv: Y
      Lock_tables_priv: Y
          Execute_priv: Y
       Repl_slave_priv: Y
      Repl_client_priv: Y
      Create_view_priv: Y
        Show_view_priv: Y
   Create_routine_priv: Y
    Alter_routine_priv: Y
      Create_user_priv: Y
            Event_priv: Y
          Trigger_priv: Y
Create_tablespace_priv: Y
              ssl_type: 
            ssl_cipher: 
           x509_issuer: 
          x509_subject: 
         max_questions: 0
           max_updates: 0
       max_connections: 0
  max_user_connections: 0
                plugin: mysql_native_password
 authentication_string: *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9
      password_expired: N
 password_last_changed: 2017-03-07 19:17:21
     password_lifetime: NULL
        account_locked: N
*************************** 2. row ***************************
                  Host: localhost
                  User: mysql.sys
           Select_priv: N
           Insert_priv: N
           Update_priv: N
           Delete_priv: N

....................

这样只不过是每次都得键入密码，有点繁琐，所以还是进入到MySQL再执行查询吧。

不登录到MySQL执行SQL语句

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