Oracle SQL 和 XML 选择事物作为 XML 类型

Question

我有这个table

 CREATE TABLE Test_T (
  COL_1 VARCHAR(30),
  COL_2 XMLTYPE
);

里面有这个

INSERT INTO Test_T VALUES ('one', XMLType('<?xml version="1.0" encoding="UTF-8"?>
<breakfast_menu>
 <food>
  <name>Belgian Waffles</name>
  <price>.95</price>
  <description>Two of our famous Belgian Waffles with plenty of real maple syrup</description>
  <calories>650</calories>
 </food>
 <food>
  <name>Strawberry Belgian Waffles</name>
  <price>.95</price>
  <description>Light Belgian waffles covered with strawberries and whipped cream</description>
  <calories>900</calories>
 </food>
 <food>
  <name>Berry-Berry Belgian Waffles</name>
  <price>.95</price>
  <description>Light Belgian waffles covered with an assortment of fresh berries and whipped cream</description>
  <calories>900</calories>
 </food>
  <food>
  <name>French Toast</name>
  <price>.50</price>
  <description>Thick slices made from our homemade sourdough bread</description>
  <calories>600</calories>
 </food>
 <food>
  <name>Homestyle Breakfast</name>
  <price>.95</price>
   <description>Two eggs, bacon or sausage, toast, and our ever-popular hash browns</description>
  <calories>950</calories>
 </food>
</breakfast_menu>
'));

我想从这个 table select Name And description 其中 name 包含 Belgian

我从这个 select 语句开始，但它似乎不起作用

SELECT XMLTYPE FROM Test_T WHERE ('/breakfast_menu/food[contains(name, 'Belgian')]');

谁能给我指出正确的方向？

Answer 1

您正在寻找 XMLTABLE。

下面是 SQL 语句与您的 XML -

的对比

SELECT name, description
  FROM test_t,
       XMLTABLE (
          '/breakfast_menu/food[contains(name,"Belgian")]'
          PASSING test_t.col_2
          COLUMNS name VARCHAR2 (100) PATH 'name',
                  description VARCHAR2 (100) PATH 'description');

写同样东西的另一种方法是 -

SELECT name, description
  FROM test_t,
       XMLTABLE (
          '/breakfast_menu/food'
          PASSING test_t.col_2
          COLUMNS name VARCHAR2 (100) PATH 'name',
                  description VARCHAR2 (100) PATH 'description')
 WHERE name LIKE '%Belgian%';

根据各种因素，其中一种可能更有效。您可以运行诊断并确定哪种过滤最适合您的数据。

Oracle SQL 和 XML 选择事物作为 XML 类型

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