mysql 数据库中的每张表加同一个字段（避免重复加）

DROP PROCEDURE IF EXISTS testEndHandle;
DELIMITER $$

 CREATE PROCEDURE testEndHandle()
BEGIN
  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 
 WHERE table_schema = ‘zhyjkfwzx‘ 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 = ‘zhyjkfwzx‘) and table_schema = ‘zhyjkfwzx‘
	 ) t WHERE t.column_name=‘upload‘ 
 );

 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 `upload` VARCHAR(4)  DEFAULT ‘0‘");
  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 testEndHandle();