mysql 存储过程案列一个。

-- 设置分隔符
DELIMITER //

/*初始化*/ 
DROP PROCEDURE IF EXISTS  useCursor //    
 
/*建立 存储过程 create */ 
CREATE PROCEDURE useCursor(input_planGuid BIGINT )
BEGIN

-- 声明游标使用的变量----------
DECLARE nowID BIGINT;-- 本行自增id 
DECLARE nowGuid BIGINT;-- 本行的guid, 
DECLARE parentGuid BIGINT;-- 本行父级guid 
DECLARE newIndex BIGINT;-- 要设置的本行的index 

DECLARE preIndex BIGINT DEFAULT -1;-- 上一行设置的index. 
DECLARE preParentGuid BIGINT DEFAULT -1;-- 上一行的父级guid 


-- 声明游标,从临时表中读取数据.循环更新临时表-----------------------------------------------
DECLARE cur1 CURSOR FOR SELECT id,guid,PARENT_GUID FROM tb_tmp ;
DECLARE CONTINUE HANDLER FOR  NOT FOUND SET nowID = NULL;
 
-- 声明临时表,并获取数据--------------------------------------------------------------------
-- 定义临时表 tb_tmp（自增主键，标题，拓展信息，原表主键ID）
DROP TEMPORARY TABLE  IF EXISTS tb_tmp;

CREATE TEMPORARY TABLE tb_tmp (
    id INT AUTO_INCREMENT PRIMARY KEY,
    funcsOrder BIGINT,
    ITEM_NO VARCHAR(200),
    GUID BIGINT,
    NAME VARCHAR(100) NULL,
    ITEM_NO_INDEX BIGINT NULL,
    PLAN_GUID BIGINT NULL,
    PARENT_GUID BIGINT
); 
 
#所有数据
INSERT INTO tb_tmp( funcsOrder,ITEM_NO,GUID,NAME,ITEM_NO_INDEX,PLAN_GUID,PARENT_GUID)
SELECT CASE WHEN (
        CASE WHEN INSTR(item_No, '.')>0 
        THEN CAST( SUBSTRING(item_No,(LENGTH(item_No)-INSTR(REVERSE(item_No), '.')+2)) AS SIGNED)
        ELSE CAST(item_No AS SIGNED) 
        END )=0 
    THEN 2147483647 
    ELSE 
        CASE WHEN INSTR(item_No, '.')>0 
        THEN CAST( SUBSTRING(item_No,(LENGTH(item_No)-INSTR(REVERSE(item_No), '.')+2)) AS SIGNED)
        ELSE CAST(item_No AS SIGNED) 
        END
    END AS funcsOrder,item_no,guid,    NAME,ITEM_NO_INDEX ,PLAN_GUID,PARENT_GUID    
FROM sn93_elggtw_goal
WHERE PLAN_GUID=input_planGuid 
ORDER BY PARENT_GUID,
(CASE WHEN (
        CASE WHEN INSTR(item_No, '.')>0 
        THEN CAST( SUBSTRING(item_No,(LENGTH(item_No)-INSTR(REVERSE(item_No), '.')+2)) AS SIGNED)
        ELSE CAST(item_No AS SIGNED) 
        END )=0 
    THEN 2147483647 
    ELSE 
        CASE WHEN INSTR(item_No, '.')>0 
        THEN CAST( SUBSTRING(item_No,(LENGTH(item_No)-INSTR(REVERSE(item_No), '.')+2)) AS SIGNED)
        ELSE CAST(item_No AS SIGNED) 
        END
    END ),item_no,guid; 
    
 


-- 临时表完毕-------------------------------------------------------------------------------

-- 开游标 
 OPEN cur1;
     /*游标向下走一步*/ 
     FETCH cur1 INTO nowID,nowGuid,parentGuid;
         
     /* 循环体 */
      WHILE ( nowID IS NOT NULL) 
      DO
     -- 如果nowID=1,则表示第一行.设置item_no_index=1即可
     IF nowID=1 THEN
        SET newIndex=1;
     ELSE
        -- 如果不是第一行:
        -- 再根据本行与上一行的数据进行判断:
        --   A:本行父级id<>上一行的父级id,则本行为第一个子.设置index=1;
        IF parentGuid!=preParentGuid THEN
         SET newIndex=1;
        ELSE
        --   B:本行父级id==上一行的父级id,则本行为上一行的兄弟,设置index=上行index+1;
         SET newIndex= preIndex + 1;        
            END IF;            
     END IF;
         -- 更新index
         UPDATE tb_tmp SET ITEM_NO_INDEX = newIndex WHERE id=nowID;
     -- 更新上一行变量.
     SET preIndex=newIndex;
     SET preParentGuid=parentGuid;
    
        /*游标向下走一步*/ 
        FETCH cur1 INTO nowID,nowGuid,parentGuid;
      END WHILE;
  
CLOSE cur1; 
-- 游标处理临时表完毕---------------------------------------------------------------------
-- 根据临时表数据,更新真实表数据----------------------------------------------------------

update sn93_elggtw_goal inner join (sn93_elggtw_goal T1 INNER JOIN tb_tmp T2 ON T1.guid=T2.guid and T1.guid=T2.guid ) on T1.PLAN_GUID=input_planGuid 
SET  T1.ITEM_NO_INDEX=T2.ITEM_NO_INDEX ;


-- 删除临时表
DROP TEMPORARY  TABLE  IF EXISTS tb_tmp;
-- over ----------------------------------------------------------------------------------
END//

DELIMITER ;