通过连接删除多个表中的行

Question

我试图从多个连接的表中删除行。但是，当我运行存储过程0行受到了影响。正如你所看到的功能是相当广泛的，但这个想法是，应当从多个表中，已连接删除行。

我该如何做这项工作？

CREATE DEFINER=`root`@`localhost` PROCEDURE `remove_tables_select1`(
    IN in_TableA_ID INT 
    ) 
BEGIN 
    DELETE FROM TableB, TableC, TableD, TableE, TableA, TableF, TableG, TableH, TableI 
    using TableB 
    inner join TableC on (TableC.ID = TableB.TableC_ID) 
    inner join TableH on (TableH.TableB_ID = TableB.ID) 
    inner join TableD on (TableD.TableB_ID = TableB.ID) 
    inner join TableE on (TableE.TableB_ID = TableB.ID) 
    inner join TableA on (TableA.ID = in_TableA_ID) 
    inner join TableF on (TableF.TableA_ID = TableA.ID) 
    inner join TableG on (TableG.TableA_ID = TableA.ID) 
    inner join TableI on (TableI.TableH_ID = TableH.ID); 
END 

较小的例如：

CREATE DEFINER=`root`@`localhost` PROCEDURE `remove_tables_select1`(
    IN in_TableA_ID INT 
    ) 
BEGIN 
    DELETE FROM TableA, TableB, TableC, TableD 
    using TableA 
    inner join TableB on (TableB.ID = TableA.TableB_ID) 
    inner join TableC on (TableC.TableB_ID = TableC.ID) 
    inner join TableD on (TableC.TableD_ID = TableD.ID) 
    WHERE TableA.ID = in_TableA_ID; 
END 

Answer 1

为了您的小例子，尝试用一个查询 -

DELETE a, b, c, d FROM TableA a 
JOIN TableB b 
    ON b.ID = a.TableB_ID 
JOIN TableC c 
    ON c.TableB_ID = c.ID 
JOIN TableD d 
    ON c.TableD_ID = d.ID 
WHERE 
    a.ID = in_TableA_ID; 

。注意，INNER JOIN被使用;检查相应的SELECT查询是否返回记录。

Answer 2

这可能会引入一些开销，但考虑使用CASCADE删除FOREING KEYS。