MySQL中如何增加字段SQL语句
作者:胜金
这篇文章主要介绍了MySQL中如何增加字段SQL语句问题,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教
MySQL增加字段SQL语句
使用ALTER TABLE向MySQL数据库的表中添加字段
-- 向buildBaseInfo中添加字段 ALTER TABLE table_name ADD COLUMN column_name VARCHAR(100) DEFAULT NULL COMMENT '新加字段' AFTER old_column;
语句内容:
table_name
:表明;column_name
:需要添加的字段名;VARCHAR(100)
:字段类型为varchar,长度100;DEFAULT NULL
:默认值NULL;AFTER old_column
:新增字段添加在old_column字段后面。
MYSQL为多表批量新增字段
navicat中新建procedure
CREATE DEFINER=`portal`@`%` PROCEDURE `pro_AddColumn`( IN tab VARCHAR(100) ) BEGIN IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name=tab AND COLUMN_NAME='CREATE_DATE') THEN SET @exe = CONCAT('ALTER TABLE ',tab," ADD CREATE_DATE DATE COMMENT '创建时间'"); PREPARE sql1 FROM @exe; EXECUTE sql1; END IF; IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name=tab AND COLUMN_NAME='CREATE_USER') THEN SET @exe = CONCAT('ALTER TABLE ',tab," ADD CREATE_USER VARCHAR(50) COMMENT '创建人'"); PREPARE sql1 FROM @exe; EXECUTE sql1; END IF; IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name=tab AND COLUMN_NAME='MODIFIED_DATE') THEN SET @exe = CONCAT('ALTER TABLE ',tab," ADD MODIFIED_DATE DATE COMMENT '修改时间'"); PREPARE sql1 FROM @exe; EXECUTE sql1; END IF; IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name=tab AND COLUMN_NAME='MODIFIED_USER') THEN SET @exe = CONCAT('ALTER TABLE ',tab," ADD MODIFIED_USER VARCHAR(50) COMMENT '修改人'"); PREPARE sql1 FROM @exe; EXECUTE sql1; END IF; IF NOT EXISTS(SELECT 1 FROM information_schema.columns WHERE table_name=tab AND COLUMN_NAME='IP') THEN SET @exe = CONCAT('ALTER TABLE ',tab," ADD IP VARCHAR(40) COMMENT 'ip'"); PREPARE sql1 FROM @exe; EXECUTE sql1; END IF; END
把代码复制进去,保存
新建查询
CALL pro_AddColumn("tableA"); CALL pro_AddColumn("tableB"); CALL pro_AddColumn("tableC"); CALL pro_AddColumn("tableD");
代码复制进去执行即可,括号里面是表名
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。