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  • 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();
    

      注:低版本的mysql-front运行不成功,需要高版本或者navicat

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  • 原文地址:https://www.cnblogs.com/gaara-zhang/p/12027761.html
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