直接执行无需先创建存储过程操作，直接和正常执行sql语句方式一样

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 = '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='新增字段名' 
 );
 
 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 `新增字段名` INT COMMENT '新增字段备注'");
  PREPARE msql FROM @MyQuery;
  
  EXECUTE msql ;#USING @c; 
   
  FETCH cur_table_structure INTO s_tablename;
  END WHILE;
 CLOSE cur_table_structure;