使用SQL提取XML数据

在我的示例中，我希望能够使用Oracle从名为“Arshad Ali”的客户的XML类型中提取特定数据

这是我插入的xml数据：

  <Customers>
    <Customer CustomerName="Arshad Ali" CustomerID="C001">
      <Orders>
        <Order OrderDate="2012-07-04T00:00:00" OrderID="10248">
          <OrderDetail Quantity="5" ProductID="10" />
          <OrderDetail Quantity="12" ProductID="11" />
          <OrderDetail Quantity="10" ProductID="42" />
        </Order>
      </Orders>
      <Address> Address line 1, 2, 3</Address>
    </Customer>
    <Customer CustomerName="Paul Henriot" CustomerID="C002">
      <Orders>
        <Order OrderDate="2011-07-04T00:00:00" OrderID="10245">
          <OrderDetail Quantity="12" ProductID="11" />
          <OrderDetail Quantity="10" ProductID="42" />
        </Order>
      </Orders>
      <Address> Address line 5, 6, 7</Address>
    </Customer>
    <Customer CustomerName="Carlos Gonzlez" CustomerID="C003">
      <Orders>
        <Order OrderDate="2012-08-16T00:00:00" OrderID="10283">
          <OrderDetail Quantity="3" ProductID="72" />
        </Order>
      </Orders>
      <Address> Address line 1, 4, 5</Address>
    </Customer>
  </Customers>
</ROOT>

---

XML节点的大小写和确切名称很重要：

SELECT extract(OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]') = 1

如果只想按名称搜索，则仅使用该属性：

SELECT extract(OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"]') = 1

但是

extract（）

和

existsnode（）

被弃用；改为使用

xmlquery（）

和

xmlexists（）

：

SELECT xmlquery('/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]'
  passing object_value
  returning content) "customer"
FROM mytable2
WHERE xmlexists('/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]'
  passing object_value)

---

XML节点的大小写和确切名称很重要：

SELECT extract(OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]') = 1

如果只想按名称搜索，则仅使用该属性：

SELECT extract(OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"]') "customer"
FROM mytable2
WHERE existsnode (OBJECT_VALUE,
  '/ROOT/Customers/Customer[@CustomerName="Arshad Ali"]') = 1

但是

extract（）

和

existsnode（）

被弃用；改为使用

xmlquery（）

和

xmlexists（）

：

SELECT xmlquery('/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]'
  passing object_value
  returning content) "customer"
FROM mytable2
WHERE xmlexists('/ROOT/Customers/Customer[@CustomerName="Arshad Ali"][@CustomerID="C001"]'
  passing object_value)