如何在SQL Server 2008中读取XML列?

I have never used XML in SQL Server 2008, I need to extract a list of customers into a variable table how do you do it?

我从未在SQL Server 2008中使用过XML，我需要将客户列表提取到一个变量表中。

Given that I have a column called CustomerList in a Sales table that looks like something like below how do I extract the list of customers in sql?

假设我在一个销售表中有一个名为CustomerList的列，它看起来如下所示，那么如何用sql提取客户列表呢?

<ArrayOfCustomers xmlns:xsd="http://www.w3.org/2001/XMLSchema"        
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <Customer>
       <ItemId>1</ItemId>
       <Value>Mr Smith</Value>
   </Customer>
   <Customer>
      <ItemId>2</ItemId>
      <Value>Mr Bloggs</Value>
   </Customer>
</ArrayOfCustomers>

2 个解决方案

#1

Try something like this:

试试这样:

SELECT
   Cust.value('(ItemId)[1]', 'int') AS 'ItemID',
   Cust.value('(Value)[1]', 'Varchar(50)') AS 'Customer Name'
FROM
   dbo.Sales.CustomerList.nodes('/ArrayOfCustomers/Customer') AS AOC(Cust)

That should give you an output something like this:

你会得到这样的输出:

ItemID  Customer Name
   1         Mr Smith
   2         Mr Bloggs

#2

You need to use CROSS APPLY from table to XML column

您需要使用从表到XML列的交叉应用。

create table sales (customerlist xml)
insert sales select '
    <ArrayOfCustomers xmlns:xsd="http://www.w3.org/2001/XMLSchema"        
                      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
       <Customer>
           <ItemId>1</ItemId>
           <Value>Mr Smith</Value>
       </Customer>
       <Customer>
          <ItemId>2</ItemId>
          <Value>Mr Bloggs</Value>
       </Customer>
    </ArrayOfCustomers>'

Your query:

SELECT
   N.C.value('ItemId[1]', 'int') ItemId,
   N.C.value('Value[1]', 'varchar(100)') Value
FROM dbo.Sales
CROSS APPLY CustomerList.nodes('//Customer') N(C)

EDIT - note
The query above was written quickly to illustrate working with xml columns in a table (multi-row). For performance reasons, don't use '//Customer' but use an absolute path instead '/ArrayOfCustomers/Customer'. '//Customer' will go through the entire XML to find Customer nodes anywhere in the XML at any level.

编辑—注意，上面的查询是快速编写的，用于说明如何处理表中的xml列(多行)。出于性能原因，不要使用'//Customer'，而是使用绝对路径'/ArrayOfCustomers/Customer'。“//Customer”将遍历整个XML，在任何级别的XML中找到客户节点。