MySQL存储过程为命令行提供不同的结果

I have a simple MySQL stored procedure designed to return all child records for a given node. My problem is when I type this manually it returns the proper results - but when I put the same code into a Stored Procedure it returns only the parent id.

我有一个简单的MySQL存储过程，用于返回给定节点的所有子记录。我的问题是当我手动输入时，它会返回正确的结果——但是当我将相同的代码放入一个存储过程中时，它只返回父id。

I'd really appreciate some guidance!

我真的很感激你的指导!

For example - when I call my procedure (code is below) I get:

例如，当我调用我的过程(代码如下)时，我得到:

call find_child(1006);
+--------+
| nodeid |
+--------+
|   1006 |
|   1006 |
|   1006 |
|   1006 |
+--------+
4 rows in set (0.01 sec)

BUT - When I cut and paste the command I get the proper resultset:

但是——当我剪切和粘贴命令时，我得到了正确的结果集:

mysql> create temporary table KID_TABLE (nodeid INT);
Query OK, 0 rows affected (0.00 sec)

mysql> insert ignore into KID_TABLE (nodeid) select nodeid from CORPORATENODE 
       where parentid in (1006);
Query OK, 4 rows affected (0.00 sec)
Records: 4  Duplicates: 0  Warnings: 0

mysql> select * from KID_TABLE;
+--------+
| nodeid |
+--------+
|   1007 |
|   1008 |
|   1031 |
|   1038 |
+--------+
4 rows in set (0.00 sec)

Here's the code:

这是代码:

DELIMITER $$

DROP PROCEDURE IF EXISTS `find_child`$$
CREATE PROCEDURE  `find_child`( IN NodeID INT)
    DETERMINISTIC
BEGIN
declare nid INT;
set nid= NodeID;
create temporary table KID_TABLE (nodeid INT);
insert ignore into KID_TABLE (nodeid) select nodeid 
from CORPORATENODE where parentid in (1006);
select * from KID_TABLE;
drop table KID_TABLE;
END $$

DELIMITER ;

Here's the DDL for PARENT table

这是父表的DDL

    CREATE TABLE  `PARENT` (  
    `NODEID` int(11) NOT NULL AUTO_INCREMENT,  
    `PARENTID` int(11) NOT NULL DEFAULT '0' COMMENT '0 value means top node',  
    `NAME` varchar(50) NOT NULL,  
    PRIMARY KEY (`NODEID`) USING BTREE  
    ) ENGINE=InnoDB;

2 个解决方案

#1

Mysql will return your in variable NodeId in your select nodeid from CORPORATENODE where parentid in (1006);

Mysql将从CORPORATENODE中返回您的变量NodeId，其中parentid在(1006);

Change the variable to in_NodeID instead.

将变量改为in_NodeID。

DELIMITER $$

DROP PROCEDURE IF EXISTS `find_child`$$
CREATE PROCEDURE  `find_child`( IN in_NodeID INT)
BEGIN
create temporary table KID_TABLE (nodeid INT);
insert ignore into KID_TABLE (nodeid) select nodeid 
from CORPORATENODE where parentid in (in_NodeID);
select * from KID_TABLE;
drop table KID_TABLE;
END $$

DELIMITER ;

But then of course, why use a temporary table?

但是当然，为什么要使用临时表呢?

DELIMITER $$

DROP PROCEDURE IF EXISTS `find_child`$$
CREATE PROCEDURE  `find_child`( IN in_NodeID INT)
BEGIN
select nodeid from CORPORATENODE where parentid in (in_NodeID);
END $$

DELIMITER ;

#2

Thanks Andreas et al,

谢谢安德烈亚斯等,

I found a workaround to this just after posting - typical. But couldn't post my solution till now. I use Linux but have lower_case_table_names=1 set so the case is irrelevant. (I think?)

我在发布后发现了一个变通方法。但我现在还不能发布我的解决方案。我使用的是Linux，但是有一个小写的_case_table_names=1，所以这个大小写是不相关的。(我认为)

Andreas, I needed the temporary table as once I had selected back all the child records for a Node I then needed to update all the child records in the table NODEVERSION. I was running this via a trigger on the NODEVERSION table and was running into problems as I was updating the calling table etc. That's why I created a new CHILD_TABLE.

Andreas，我需要临时表，因为一旦我为一个节点选择了所有子记录，我就需要更新表NODEVERSION中的所有子记录。我通过NODEVERSION表上的触发器运行它，在更新调用表等时遇到了问题。这就是为什么我创建了一个新的CHILD_TABLE。

So I found that (even leaving DETERMINISTIC in... sorry pilcrow!) The following worked as expected - all I did was added aliases ... (The code below is a little different from above as I simplified the above code for my question)

所以我发现(即使是在…对不起pilcrow !)下面的操作如预期的那样-我所做的只是添加别名……(下面的代码与上面的稍有不同，因为我简化了上面的代码)

Don't fully understand why the aliases fixed the initial problem - but it worked. Perhaps you experts know why?

不完全理解为什么别名解决了最初的问题——但它确实有效。也许你们这些专家知道为什么?

    CREATE PROCEDURE `find_child`( IN NodeID int)
    DETERMINISTIC
    BEGIN
     declare nid INT;
     declare rows_before INT DEFAULT 0;
     declare rows_after INT DEFAULT 0;
     set nid= NodeID;
     delete from CHILD_TABLE;
     insert into CHILD_TABLE values (nid);
     set rows_before = (select count(*) from CHILD_TABLE);
     if rows_before !=rows_after then
       increment: repeat
        set rows_before = (select count(*) from CHILD_TABLE);
        insert ignore into CHILD_TABLE (nodeid) select b.nodeid from CORPORATENODE b 
        where b.parentid in (select c.nodeid from CHILD_TABLE c);
        set rows_after= (select count(*) from CHILD_TABLE);
        until rows_before =rows_after
       end repeat increment;
    end if;
    update NODEVERSION n set STATUS=1 where n.nodeid in 
    (select c.nodeid from CHILD_TABLE c);
   END

#1