我有一个简单的MySQL存储过程,该过程旨在返回给定节点的所有子记录.
我的问题是,当我手动键入此命令时,它会返回正确的结果-但是,当我将相同的代码放入存储过程中时,它仅返回父ID.

我非常感谢您的指导！

例如-当我调用过程(代码在下面)时,我得到：

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

但是-当我剪切并粘贴命令时,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)

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 ;

这是PARENT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;

解决方法:

MySQL将在您选择的节点ID中返回您的变量NodeId
来自CORPORATENODE,其中父级为(1006)；

改为将变量更改为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 ;

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 ;