使用 SQL 提取 XML 数据答案

【问题标题】：Extracting XML data using SQL使用 SQL 提取 XML 数据
【发布时间】：2020-07-02 21:05:52
【问题描述】：

在我的示例中，我希望能够使用 Oracle 为名为“Arshad Ali”的客户从 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>

using get clob 我能够提取所有客户。

想知道是否有人可以帮助我为特定客户提取数据.. 尝试使用以下但不成功

SELECT extract(OBJECT_VALUE, '/root/Customers') "customer"
  FROM mytable2
  WHERE existsNode(OBJECT_VALUE, '/customers[CustomerName="Arshad Ali" CustomerID="C001"]')
        = 1;

【问题讨论】：

标签： sql xml oracle oracle12c xmltype

【解决方案1】：

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

db<>fiddle

如果您只想按名称搜索，请仅使用该属性：

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extract() 和existsnode() 已被弃用；请改用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)

db<>fiddle

【讨论】：