从多行多表创建嵌套 XML 文档 - SQL 查询

Question

我正在尝试在 RPG 程序中通过 SQL 创建一个 XML 文档，但我似乎找不到使 XML 看起来像这样的方法。

<ReplenishmentTask>
    <TaskID>MTEST20 </TaskID>
    <ContainerID> </ContainerID>
    <ReplenishmentLine>
        <PART> 2P8267 </PART>
        <QTY>2</QTY>
    </ReplenishmentLine>
    <ReplenishmentLine>
        <PART> 2P8267 </PART>
        <QTY>2</QTY>
    </ReplenishmentLine>
</ReplenishmentTask>
<ReplenishmentTask>
    <TaskID>MTEST20 </TaskID>
    <ContainerID> </ContainerID>
    <ReplenishmentLine>
        <PART> 2P8267 </PART>
        <QTY>2</QTY>
    </ReplenishmentLine>
    <ReplenishmentLine>
        <PART> 2P8267 </PART>
        <QTY>2</QTY>
    </ReplenishmentLine>
</ReplenishmentTask>

这是我的代码的样子：

  SELECT XMLDOCUMENT(                                                    
        XMLELEMENT(NAME "Download",                                                         
           XMLAGG(                                                   
            XMLELEMENT(NAME "ReplenishmentTask",                     
              XMLFOREST(a.FIELD1 as "TaskID",                        
                        a.FIELD2 as "ContainerID",                   
                    ( SELECT                                         
                        XMLDOCUMENT(XMLAGG(                          
                                 XMLFOREST( b.PART as "PART",      
                                            b.ORQY   as "QTY" )      
                               ))  // end AGG and DOCUMENT  
                               FROM TABLE2 b                       
                                WHERE b.FIELD1 = A.FIELD1            
                    ) AS "ReplenishmentLine"  // end SELECT          
              )  // end FOREST - Inv                                 
            )    // end ELEMENT - ReplenishmentTask                  
           )     // end AGG                                                                  
         )       // end ELEMENT - Download            
        )        // end DOCUMENT                                                              
FROM TABLE1 a                                          
 ;

这就是结果 - 我需要删除额外的 XML 标签 ReplenishmentLine 但不能，因为如果我使用 XMLForest，子选择也需要有一个 XML 标签。 还有别的办法吗？

<ReplenishmentTask>
<TaskID>MTEST20 </TaskID>
<ContainerID> </ContainerID>
<ReplenishmentLine>
    <TESTT> 
        <PART> 2P8267 </PART>
        <QTY>2</QTY>
    </TESTT>
</ReplenishmentLine>
</ReplenishmentTask>
<ReplenishmentTask>
    <TaskID>MTEST40 </TaskID>
    <ContainerID> </ContainerID>
    <ReplenishmentLine>
        <TESTT>
            <PART> 2P8267 </PART>
            <QTY>3</QTY>
        </TESTT>
        <TESTT>
            <PART> 4C3384 </PART>
            <QTY>3</QTY>    
        </TESTT>
    </ReplenishmentLine>
</ReplenishmentTask> 

Answer 1

在 SQL SERVER 中，它或多或少是这样的：

SELECT a.FIELD1 as "TaskID",                        
   a.FIELD2 as "ContainerID",                                   
   ( SELECT b.PART as "PART",      
            b.ORQY   as "QTY" 
      FROM TABLE2 b                       
      WHERE b.FIELD1 = A.FIELD1            
       FOR XML PATH('ReplenishmentLine')) 
FROM TABLE1 a
FOR XML PATH('ReplenishmentTask')

这真的取决于你需要什么。

Answer 2

在尝试了其他方法后，我改为这样做了。 我刚刚关闭了 XML 森林，并在第二个 select 之前加了一个逗号。

  SELECT XMLDOCUMENT(                                                    
        XMLELEMENT(NAME "Download",                                                         
           XMLAGG(                                                   
            XMLELEMENT(NAME "ReplenishmentTask",                     
              XMLFOREST(a.FIELD1 as "TaskID",                        
                        a.FIELD2 as "ContainerID"), > added closing parenthesis so the next select will not be considered                   
                    ( SELECT                                         
                        XMLDOCUMENT(XMLAGG(                          
                                 XMLFOREST( b.PART as "PART",      
                                            b.ORQY   as "QTY" )      
                               ))  // end AGG and DOCUMENT  
                               FROM TABLE2 b                       
                                WHERE b.FIELD1 = A.FIELD1            
                    )  //removed this > AS "ReplenishmentLine"  // end SELECT          
              )  // end FOREST - Inv                                 
            )    // end ELEMENT - ReplenishmentTask                  
           )     // end AGG                                                                  
         )       // end ELEMENT - Download            
        )        // end DOCUMENT                                                              
FROM TABLE1 a                            

谢谢！