如何在mysql中存储存储过程的返回值

Question

虽然在Stack Overflow中有很多关于这个问题的问题，但我不能正确地解决它，有谁可以帮助我解决这个问题，假设有两个存储过程，

CREATE PROCEDURE `procOne`(stName varchar(7),fullItemCode varchar(12), fullLedNo varchar(12))
BEGIN
set @x = concat('
SELECT ID, Uprice FROM ',stName,' 
where Uprice > 0 and FulItmCode="',fullItemCode,'" and FullLedgerNo = "',fullLedNo,'" order by Dat desc limit 1;
');
PREPARE stmt FROM @x;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END

和

CREATE PROCEDURE `prcTwo`()
BEGIN

CREATE TEMPORARY TABLE tmpStore (
  ID int(10),
  Uprice decimal(18,2)
)

insert into tmpStore exec procOne(@param1, @param2) 

select * from tempStore; 

DROP TABLE tmpStore;

END

我已经尝试过了，但在尝试保存prcTwo时出现以下错误

ERROR 1064: You have an error in your SQL syntax; check the manual that 
corresponds to your MySQL server version for the right syntax to use near
'insert into tmpStore exec procOne 'St_BFG','SCI019', 'BIO-JVS-30' output
sele' at line 9 SQL Statement: CREATE DEFINER=user1@localhost PROCEDURE 
prcTwo() BEGIN CREATE TEMPORARY TABLE tmpStore ( ID int(10), Uprice 
decimal(18,2) ) insert into tmpStore exec procOne 'St_BFG','SCI019', 
'BIO-JVS-30' output  select * from tempStore; DROP TABLE tmpStore; END

Answer 1

过程不返回值，您必须将procOne声明为函数：

CREATE FUNCTION `procOne`(stName varchar(7),fullItemCode varchar(12), fullLedNo varchar(12)) 
RETURNS INTEGER
BEGIN 
  set @x = concat(' 
  SELECT ID, Uprice FROM ',stName,' 
    INTO @var1, @var2 
    WHERE Uprice > 0 
      AND FulItmCode="',fullItemCode,'" 
      AND FullLedgerNo = "',fullLedNo,'" 
     ORDER BY Dat DESC limit 1; 
  '); 
  PREPARE stmt FROM @x; 
      EXECUTE stmt; 
      DEALLOCATE PREPARE stmt; 
  RETURN @var1;
END 

请注意，函数每次调用只能返回单个值。

Answer 2

像这样使用out参数

CREATE PROCEDURE abc(IN id INTEGER, OUT text VARCHAR(255))
BEGIN 
    SET text = 'asd';
END

您可以像这样调用此过程：

SET @outvar = '';
CALL abc(1, @outvar);

则'asd‘将保存在@outvar中

Answer 3

正如上面提到的，我不完全理解你在做什么。将你的信息逐字记录下来，下面的内容似乎能达到预期的效果。

CREATE PROCEDURE `prcTwo`()
BEGIN
    CALL procOne(@param1, @param2);
END

在您的操作过程中，您遗漏了一些分号。以下是已更正错误的prcTwo过程

CREATE PROCEDURE `prcTwo`()
BEGIN

CREATE TEMPORARY TABLE tmpStore (
  ID int(10),
  Uprice decimal(18,2)
);

INSERT INTO tmpStore CALL procOne(@param1, @param2) ;

SELECT * FROM tempStore; 

DROP TABLE tmpStore;

END