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| DROP PROCEDURE
IF
EXISTS addColumn;
DELIMITER $$
CREATE PROCEDURE addColumn () BEGIN
-- 定义表名变量
DECLARE
s_tablename VARCHAR ( 100 );
/*显示表的数据库中的所有表
SELECT table_name FROM information_schema.tables WHERE table_schema='databasename' Order by table_name ;
*/#显示所有
DECLARE
cur_table_structure CURSOR FOR SELECT
table_name
FROM
INFORMATION_SCHEMA.TABLES
-- databasename = 数据库名称
WHERE
table_schema = '数据库名称'
AND table_name NOT IN (
SELECT
t.table_name
FROM
( SELECT table_name, column_name FROM information_schema.COLUMNS WHERE table_name IN ( SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = '数据库名称' ) ) t
WHERE
t.column_name = 'object_name'
);
DECLARE
CONTINUE HANDLER FOR SQLSTATE '02000'
SET s_tablename = NULL;
OPEN cur_table_structure;
FETCH cur_table_structure INTO s_tablename;
WHILE
( s_tablename IS NOT NULL ) DO
SET @MyQuery = CONCAT( "alter table `", s_tablename, "` add COLUMN `字段名` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '描述'" );
PREPARE MSQL
FROM
@MyQuery;
EXECUTE MSQL;#USING @c;
FETCH cur_table_structure INTO s_tablename;
END WHILE;
CLOSE cur_table_structure;
END;
$$ #执行存储过程
CALL addColumn ();
|