mysql 1833

server_list MODIFY COLUMN server_lip CHAR(25);

报错信息：

1 queries executed, 0 success, 1 errors, 0 warnings

查询：alter table server_list modify column server_lip char(25)

错误代码： 1833

Cannot change column ‘server_lip‘: used in a foreign key constraint ‘server_history_ibfk_1‘ of table ‘OMServer.server_history‘

原因：server_list表中的server_lip字段为server_history表的外键，server_history建表语句：

CREATE TABLE server_history (

ID int(11) NOT NULL AUTO_INCREMENT COMMENT ‘主键ID‘,

history_id int(11) NOT NULL COMMENT ‘事件ID‘,

history_ip char(15) NOT NULL COMMENT ‘事件IP地址‘,

history_user char(15) NOT NULL COMMENT ‘事件用户名‘,

history_datetime datetime NOT NULL COMMENT ‘事件时间‘,

db_datetime timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT ‘入库时间‘,

history_command char(255) NOT NULL COMMENT ‘事件命令‘,

PRIMARY KEY (ID),