从存储过程返回XML

Question

我必须以下面的格式从SQL Server Stored Proc返回XML：

<Customer1>
 <Policy1></Policy1>
 <Policy2></Policy2>
</Customer1>
<Customer2>
 <Policy1></Policy1>
 <Policy2></Policy2>
 <Policy3></Policy3>`
<Customer2>
.......

问题是我的Query为每一行创建了<Customer>个节点。

Answer 1

每当您看到编号名称（ Policy1，Policy2 ... 或 Customer1，Customer2 ）时，您可以确定，设计不良！

在您的情况下，似乎您希望将列值用作元素名称。这是你真的不应该做的事情！

假设有一个带有ID和Name的客户表以及一个带有ID，CustomerID和Number的策略表，它可能如下所示：

DECLARE @customer TABLE(ID INT,Name VARCHAR(100));
INSERT INTO @customer VALUES(1,'cust 1'),(2,'cust 2'),(3,'cust 3');

DECLARE @policy TABLE(ID INT,CustomerID INT,Number VARCHAR(100));
INSERT INTO @policy VALUES
 (1,1,'p1 for c1'),(2,1,'p2 for c1')
,(3,2,'p1 for c2'),(4,2,'p2 for c2'),(5,2,'p3 for c2')
--no policy for c3

SELECT ID AS [@id]
      ,Name AS [@name]
      ,(
        SELECT ID AS [@id]
              ,Number AS [@number] 
        FROM @policy AS p
        WHERE p.CustomerID=c.ID
        FOR XML PATH('policy'),ROOT('policies'),TYPE
       )
FROM @customer AS c
FOR XML PATH('Customer')

结果

<Customer id="1" name="cust 1">
    <policies>
        <policy id="1" number="p1 for c1" />
        <policy id="2" number="p2 for c1" />
    </policies>
</Customer>
<Customer id="2" name="cust 2">
    <policies>
        <policy id="3" number="p1 for c2" />    
        <policy id="4" number="p2 for c2" />
        <policy id="5" number="p3 for c2" />
    </policies>
</Customer>
<Customer id="3" name="cust 3" />

提示

你可以让,ROOT('policies')离开（不推荐）