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最近修改mysql數(shù)據(jù)庫(kù)表中的字段長(zhǎng)度時(shí)報(bào)錯(cuò),執(zhí)行更改的sql語(yǔ)句:
ALTER TABLE server_list MODIFY COLUMN server_lip CHAR(25);
報(bào)錯(cuò)信息:
1 queries executed, 0 success, 1 errors, 0 warnings
查詢:alter table server_list modify column server_lip char(25)
錯(cuò)誤代碼: 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字段為server_history表的外鍵,server_history建表語(yǔ)句:
CREATE TABLE server_history
(ID
int(11) NOT NULL AUTO_INCREMENT COMMENT '主鍵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 '事件用戶名',history_datetime
datetime NOT NULL COMMENT '事件時(shí)間',db_datetime
timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '入庫(kù)時(shí)間',history_command
char(255) NOT NULL COMMENT '事件命令',
PRIMARY KEY (ID
),
KEY history_ip
(history_ip
),
CONSTRAINT server_history_ibfk_1
FOREIGN KEY (history_ip
) REFERENCES server_list
(server_lip
)
) ENGINE=InnoDB AUTO_INCREMENT=27 DEFAULT CHARSET=utf8 COMMENT='操作事件表'
解決步驟:
1.鎖表
LOCK TABLES server_history WRITE,server_list WRITE;
2.查看是否被鎖
3.解除server_history表外鍵約束
ALTER TABLE server_history DROP FOREIGN KEY server_history_ibfk_1;
4.更改server_list表server_lip字段長(zhǎng)度
ALTER TABLE server_list MODIFY COLUMN server_lip CHAR(25);
查看表結(jié)構(gòu)發(fā)現(xiàn)已完成字段長(zhǎng)度更新
5.新增server_history表外鍵約束
ALTER TABLE server_history
ADD CONSTRAINT server_history_ibfk_1
FOREIGN KEY (history_ip
) REFERENCES server_list
(server_lip
);
6.解除鎖定
UNLOCK TABLES;
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