Question

我有一块SQL可以计算排行榜上高尔夫球手的排名。我是Spring的新手，我不认为我可以使用Spring JDBC执行此操作，因此我认为我需要将其转换为mySQL存储过程。

有谁可以给我一些关于我需要转换的指示？简单地将CREATE PROCEDURE和param列表放在此处不起作用。

SET @rank = 1, @prev_val = NULL, @prev_rank = NULL;
SELECT rank FROM
(
 SELECT @rank := IF(@prev_val!=winnings,@prev_rank+1,@rank) AS rank
     , @prev_val := winnings AS winnings
     , @prev_rank := @rank AS prevRank
     , t.golferID
  FROM 
     (
        select g.golferID, sum(winnings) as winnings 
        from results r
        join resultDetails rd on r.resultID = rd.resultID
        join golfers g on rd.golferID = g.golferID
        where r.status = 'C' and r.compID = 1 
        group by golferID order by winnings desc
     ) AS t
) AS showRank WHERE golferID = 16

Answer 1

这会让你开始：

drop procedure if exists get_golfer_rank;

delimiter #

create procedure get_golfer_rank
(
p_golferID int unsigned
)
proc_main:begin

set @rank = 0;

select 
...
where golferID = p_golferID;

end proc_main #

delimiter ;


call get_golfer_rank(18);

Answer 2

你的训练很好 - f00假设你只想通过给定的参数调出每个高尔夫球手的等级 - 因此构造......

create procedure get_golfer_rank
(
p_golferID int unsigned
)

和...

where golferID = p_golferID;

限制单个高尔夫球手。

Answer 3

感谢领导。我把它解决了。粗略地说它是

drop procedure if exists getRank;

delimiter $$

create procedure getRank()
begin

    set @rank = 1; 
    set @prev_val = NULL;
    set @prev_rank = NULL;

    select rank from
    (
     select @rank := if(@prev_val!=winnings,@prev_rank+1,@rank) as rank
         , @prev_val := winnings as winnings
         , @prev_rank := @rank as prevrank
         , t.golferid
      from 
         (
            select g.golferid, sum(winnings) as winnings 
            from results r
            join resultdetails rd on r.resultid = rd.resultid
            join golfers g on rd.golferid = g.golferid
            where r.status = 'c' and r.compid = 1 
            group by golferid order by winnings desc
         ) as t
    ) as showrank where golferid = 16;

end; $$

delimiter ;

将SQL语句转换为mySQL存储过程

3 个答案: