mysql 為某一資料庫下所有表中添加相同欄位

標籤：

BEGIN
  DECLARE s_tablename VARCHAR(100);
 
 /*顯示表的資料庫中的所有表
 SELECT table_name FROM information_schema.tables WHERE table_schema=‘databasename‘ Order by table_name ;
 */

#顯示所有
 DECLARE cur_table_structure CURSOR
 FOR
 SELECT table_name
 FROM INFORMATION_SCHEMA.TABLES
 WHERE table_schema = ‘preschool‘
 ORDER BY table_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 sharding_name VARCHAR(30)");
  PREPARE msql FROM @MyQuery;
 
  EXECUTE msql ;#USING @c;
   
  FETCH cur_table_structure INTO s_tablename;
  END WHILE;
 CLOSE cur_table_structure;

    END

mysql 為某一資料庫下所有表中添加相同欄位