检索连接状态

有没有办法在另一个连接上调用status命令。例如：检索连接状态

status 231073

其中的数字是SHOW PROCESSLIST中的ID。特别是我对连接/客户端字符集感兴趣。

编辑：通过status我的意思是你从MySQL壳（不show status）

来源

2016-09-07 Tichomir Mitkov

我相信你会需要哄骗它编程，以便每个客户端连接运行'show status'，捕获结果集并将其发布到客户端会话工作表。任何语言都不应太难。 – Drew

@Drew'show status'不显示字符编码 –

您指的是哪种状态。改善问题 – Drew

你可以使用调用命令下捕捉到你的连接，说的信息，在任何时候您的应用程序或启动。例如max_allowed_packet可能会在客户端运行生命周期中更改。总之，作为您的应用程序启动的一部分。

然后您收集了有关客户端连接的信息，例如字符集设置。

模式：

DROP TABLE IF EXISTS connectionSnapshot; 
CREATE TABLE connectionSnapshot 
( -- based off of (more or less) mysql 5.6 show create table information_schema.PROCESSLIST; 
    -- 3 columns at least 
    -- TODO: compare to same structure on mysql 5.7 
    id INT AUTO_INCREMENT PRIMARY KEY, 
    connId BIGINT UNSIGNED NOT NULL, 
    user VARCHAR(16) NOT NULL, 
    host VARCHAR(64) NOT NULL, 
    login VARCHAR(100) NOT NULL, 
    -- the followed just dreamt up: 
    character_set_client VARCHAR(100) NOT NULL, 
    character_set_connection VARCHAR(100) NOT NULL, 
    character_set_results VARCHAR(100) NOT NULL, 
    collation_connection VARCHAR(100) NOT NULL, 
    lc_time_names VARCHAR(100) NOT NULL, 
    max_allowed_packet BIGINT NOT NULL, 
    time_zone VARCHAR(100) NOT NULL, 
    theWhen DATETIME NOT NULL 
);

存储过程：

DROP PROCEDURE IF EXISTS uspConnectionSnapshotMe; 
DELIMITER $$ 
CREATE PROCEDURE uspConnectionSnapshotMe() 
BEGIN 
    DECLARE lconnId INT; 
    DECLARE luser VARCHAR(16); 
    DECLARE lhost VARCHAR(64); 
    SELECT connection_id() INTO lconnID; 
    SELECT USER,HOST into luser,lhost FROM information_schema.PROCESSLIST WHERE ID=lconnId; 

    INSERT connectionSnapshot (connId,user,host,login,character_set_client,character_set_connection,character_set_results, 
    collation_connection,lc_time_names,max_allowed_packet,time_zone,theWhen) VALUES 
    (lconnId,luser,lhost,current_user(),@@session.character_set_client,@@session.character_set_connection, 
    @@session.character_set_results,@@session.collation_connection, 
    @@session.lc_time_names,@@session.max_allowed_packet,@@session.time_zone,now()); 
END$$ 
DELIMITER ; 
-- ****************************************************************************************

测试：

call uspConnectionSnapshotMe();

结果：

select * from connectionSnapshot; 
+----+--------+------+-----------------+----------------+----------------------+--------------------------+-----------------------+----------------------+---------------+--------------------+-----------+---------------------+ 
| id | connId | user | host   | login   | character_set_client | character_set_connection | character_set_results | collation_connection | lc_time_names | max_allowed_packet | time_zone | theWhen    | 
+----+--------+------+-----------------+----------------+----------------------+--------------------------+-----------------------+----------------------+---------------+--------------------+-----------+---------------------+ 
| 1 | 3825 | root | localhost:4660 | [email protected] | utf8     | utf8      | utf8     | utf8_general_ci  | en_US   |   4194304 | SYSTEM | 2016-09-08 02:40:18 | 
| 2 | 37007 | root | localhost:52071 | [email protected] | utf8     | utf8      | cp850     | utf8_general_ci  | en_US   |   4194304 | SYSTEM | 2016-09-08 02:44:17 | 
+----+--------+------+-----------------+----------------+----------------------+--------------------------+-----------------------+----------------------+---------------+--------------------+-----------+---------------------+

来源

2016-09-08 06:58:04 Drew

检索连接状态

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