存储过程

1.mysql相关

DROP PROCEDURE IF EXISTS pro_add_col;  

CREATE  PROCEDURE  pro_add_col(IN col varchar(255))
BEGIN
        DECLARE  no_more_data INT DEFAULT 0;  
        DECLARE  tablename VARCHAR(255);  
        DECLARE  cur_tables CURSOR FOR   select TABLE_NAME from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA='sal' and TABLE_NAME like 'sal_%';
        DECLARE  CONTINUE HANDLER FOR NOT FOUND  SET  no_more_data = 1;
        OPEN  cur_tables; 
    FETCH  cur_tables INTO tablename;
        
        REPEAT  
          set @sql_alter_table = CONCAT('alter table  ',tablename,' add ',col,' varchar(255)');
            PREPARE pst FROM @sql_alter_table;
            EXECUTE pst;
            FETCH  cur_tables INTO tablename;
        UNTIL  no_more_data = 1 END REPEAT;
        CLOSE cur_tables;
END;
CALL pro_add_col('eno');  


DROP PROCEDURE IF EXISTS pro_drop_col;  

CREATE  PROCEDURE  pro_drop_col(IN col varchar(255))
BEGIN
        DECLARE  no_more_data INT DEFAULT 0;  
        DECLARE  tablename VARCHAR(255);  
        DECLARE  cur_tables CURSOR FOR   select TABLE_NAME from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA='sal' and TABLE_NAME like 'sal_%';
        DECLARE  CONTINUE HANDLER FOR NOT FOUND  SET  no_more_data = 1;
        OPEN  cur_tables; 
    FETCH  cur_tables INTO tablename;
        
        REPEAT  
          set @sql_alter_table = CONCAT('alter table  ',tablename,' drop column ',col);
            PREPARE pst FROM @sql_alter_table;
            EXECUTE pst;
            FETCH  cur_tables INTO tablename;
        UNTIL  no_more_data = 1 END REPEAT;
        CLOSE cur_tables;
END;

CALL pro_drop_col('eno');