XML Oracle:多子节点提取

问题描述

我有一个 xml 代码:

I have an xml code :

<begin>
    <entry>
        <lastname>gordon</lastname>
        <NumberList>
            <number>100</number>
            <codelist>
                 <code>213</code>
                 <code>214</code>
            <codelist>
            <login>
                 <user>user1</user>
                 <user>user2</user>
            </login>
        <NumberList>
        <address>
            <addresslist>Jl. jalan pelan-pelan ke Bekasi, Indonesia</addresslist>
        </address>
    </entry>
    <entry>
        <lastname>mark</lastname>
        <address>
            <addresslist>Jl. jalan cepet-cepet ke Jakarta, Indonesia</addresslist>
        </address>
    </entry>
</begin>

我的代码:

FOR r IN (SELECT VALUE(p) col_val,
                 EXTRACT(VALUE(P), '/entry/codelist') AS code,
                 EXTRACT(VALUE(P), '/entry/login') AS login
           FROM TABLE(XMLSequence(Extract(x,'/begin/entry'))) p)
LOOP
   IF r.col_val.existsnode('/entry/lastname/text()') > 0 
   THEN
      vc_lastname := r.col_val.extract('/sdnEntry/lastname/text()').getstringval();
   END IF;

   IF r.col_val.existsnode('/entry/address/addresslist/text()') > 0 
   THEN
    vc_address := r.col_val.extract('/sdnEntry/address/addresslist/text()').getstringval();
   END IF;

   IF r.col_val.existsnode('/entry/codelist/id/code/text()') > 0 AND r.col_val.existsnode('/entry/login/user/text()') > 0 
   THEN
      FOR R1 IN (SELECT EXTRACTVALUE(VALUE(T1), '/codelist/code/text()') AS code
                   FROM TABLE(XMLSEQUENCE(EXTRACT(R.code, '/codelist'))) T1)
      LOOP
         DBMS_OUTPUT.PUT_LINE(vc_uid||' - '||vc_firstName||' - '||R1.code||' - '||R2.address);
      END LOOP;

      FOR R2 IN (SELECT
                        EXTRACTVALUE(VALUE(T1), '/login/user/text()') AS user
                   FROM TABLE(XMLSEQUENCE(EXTRACT(R.address, 'login/'))) T1)
      LOOP
         DBMS_OUTPUT.PUT_LINE(vc_uid||' - '||vc_firstName||' - '||R2.user||' - '||R2.address);
      END LOOP;
  ELSE
        DBMS_OUTPUT.PUT_LINE(vc_uid||' - '||vc_firstName);
  END IF;

我的问题:如何循环子节点使数据变成这样:

My problem : How to loop child nodes so the data will become like this :

LastName | Number | code    | user  |   address
gordon   | 100    | 213     | user1 |Jl. jalan pelan-pelan ke Bekasi, Indonesia
gordon   | 100    | 213     | user2 |Jl. jalan pelan-pelan ke Bekasi, Indonesia
gordon   | 100    | 214     | user1 |Jl. jalan pelan-pelan ke Bekasi, Indonesia
gordon   | 100    | 214     | user2 |Jl. jalan pelan-pelan ke Bekasi, Indonesia
mark     | Null   | null    | null  |Jl. jalan cepet-cepet ke Jakarta, Indonesia

任何帮助将不胜感激.

推荐答案

你可以使用 XMLTable() 函数来达到预期的效果:

You can achieve desired result by using XMLTable() function:

select q.Lastname
     , q.Numberid
     , s.codeid
     , w.LoginId
     , q.address
  from t1 t
  left join xmltable('/begin/entry'
                      passing t.xml_col 
                      columns LastName   varchar2(21)  path 'lastname',
                              NumberId   number        path 'NumberList/number',
                              Address    varchar2(201) path 'address/addresslist',
                              CodeList   XmlType       Path 'NumberList/codelist/code',
                              Logins     XmlType       Path 'NumberList/login/user'
                      ) q
    on (1=1) 
  left join xmltable('/code'
                      passing q.CodeList
                      columns CodeId number path '.') s
    on (1=1)
  left join   xmltable('/user'
                        passing q.Logins
                        columns LoginId varchar2(11) path '.') w
    on (1=1)

结果:SQLFiddle 演示

Lastname Numberid Codeid Loginid Address 
---------------------------------------------------------------------------
gordon   100      213    user1   Jl. jalan pelan-pelan ke Bekasi, Indonesia 
gordon   100      213    user2   Jl. jalan pelan-pelan ke Bekasi, Indonesia 
gordon   100      214    user1   Jl. jalan pelan-pelan ke Bekasi, Indonesia 
gordon   100      214    user2   Jl. jalan pelan-pelan ke Bekasi, Indonesia 
mark     null     null   null    Jl. jalan cepet-cepet ke Jakarta, Indonesia 

了解更多关于XMLTable() 函数.

注意:使用 11.2.0.2 之前的 Oracle 版本，当 cursor_sharing 参数设置为 FORCE 或 SIMILAR(从 11.2 开始弃用).将cursor_sharing参数设置为EXACT(默认值)，即可解决问题.

Note: Working with Oracle releases prior to 11.2.0.2, you can encounter ORA-1780 error(bug 8545377) on certain types of XML queries when cursor_sharing parameter is set to FORCE or SIMILAR(deprecated starting from 11.2). Setting cursor_sharing parameter to EXACT(default value), will solve the problem.

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