解析簡單的XML與Oracle SQL

Question

我需要解析以下XML：

<?xml version="1.0" encoding="Windows-1251"?> 
<Dialog> 
    <Item QID="9" Answer="1000" UniqueGrInd="1"/> 
    <Item QID="10" Answer="1001 UniqueGrInd="2"/> 
</Dialog> 

，並返回這樣的結果：

QID Answer UniqueGrInd 
    9  1000  1 
    10  1001  2 

Answer 1

你想用XMLTABLE，像這樣：

WITH sample_data AS (SELECT 1 id, XMLTYPE('<?xml version="1.0" encoding="Windows-1251"?> 
<Dialog> 
    <Item QID="9" Answer="1000" UniqueGrInd="1"/> 
    <Item QID="10" Answer="1001" UniqueGrInd="2"/> 
</Dialog>') xmldata FROM dual UNION ALL 
        SELECT 2 id, XMLTYPE('<?xml version="1.0" encoding="Windows-1251"?> 
<Dialog> 
    <Item QID="12" Answer="2000" UniqueGrInd="1"/> 
    <Item QID="13" Answer="2001" UniqueGrInd="2"/> 
    <Item QID="14" Answer="2002" UniqueGrInd="3"/> 
</Dialog>') xmldata FROM dual) 
SELECT sd.id, 
     x.qid, 
     x.answer, 
     x.unique_gr_ind 
FROM sample_data sd 
     CROSS JOIN XMLTABLE('Dialog/Item' PASSING sd.xmldata 
          COLUMNS qid INTEGER PATH '@QID', 
            answer INTEGER PATH '@Answer', 
            unique_gr_ind INTEGER PATH '@UniqueGrInd') x; 

    ID QID ANSWER UNIQUE_GR_IND 
---- --- ------ ------------- 
    1 9 1000    1 
    1 10 1001    2 
    2 12 2000    1 
    2 13 2001    2 
    2 14 2002    3