mysql一次给数据库所有表加字段

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 ();

执行sql语句后执行

SELECT
    concat( 'ALTER TABLE ', table_schema, '.', table_name, ' ADD COLUMN tenant_id bigint(20) NULL;' ) 
FROM
    information_schema.TABLES t
WHERE
    table_schema = 'dumping_saas';