如何在 Oracle 中“打开”XML 数据

Question

这是我想用 PL/SQL 重写的一些 TSQL 的示例。

DECLARE @xml XML

SET @xml = '<theRange>
    <theRow><First>Bob</First><Last>Smith</Last><Age>30</Age></theRow>
    <theRow><First>Sue</First><Last>Jones</Last><Age>34</Age></theRow>
    <theRow><First>John</First><Last>Bates</Last><Age>40</Age></theRow>
</theRange>'

;WITH OpenedXML AS (
    SELECT  r.value('First[1]','varchar(50)') AS First,
        r.value('Last[1]','varchar(50)') AS Last,
        r.value('Age[1]','int') AS Age
    FROM @xml.nodes('//theRange/theRow') AS Row(r)
)
SELECT * 
FROM OpenedXML
WHERE Age BETWEEN 30 AND 35

谁能在这里给我一些指导。

Answer 1

此 SO 中描述了几种方法：

Oracle Pl/SQL: Loop through XMLTYPE nodes

更新：这很简单，因为这两种方法都是纯 SQL（您可以从 PL/SQL 或任何与数据库交互的工具调用此 SQL）：

SQL> WITH openedXml AS (
  2  SELECT extractvalue(column_value, '/theRow/First') FIRST,
  3         extractvalue(column_value, '/theRow/Last') LAST,
  4         to_number(extractvalue(column_value, '/theRow/Age')) Age
  5    FROM TABLE(XMLSequence(XMLTYPE('<theRange>
  6      <theRow><First>Bob</First><Last>Smith</Last><Age>30</Age></theRow>
  7      <theRow><First>Sue</First><Last>Jones</Last><Age>34</Age></theRow>
  8      <theRow><First>John</First><Last>Bates</Last><Age>40</Age></theRow>
  9  </theRange>').extract('/theRange/theRow')))
 10  )
 11  SELECT *
 12    FROM openedxml
 13   WHERE age BETWEEN 30 AND 35;

FIRST     LAST       AGE
--------- -------- -----
Bob       Smith       30
Sue       Jones       34