MySQL中如何增加字段SQL语句

-- 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;

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

CALL pro_AddColumn("tableA");
CALL pro_AddColumn("tableB");
CALL pro_AddColumn("tableC");
CALL pro_AddColumn("tableD");