xml 如何在oracle中使用xmltable？
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how to use xmltable in oracle?
提问by Yangrui
I am using Oracle's XML DB to create user profiles. I stored user profiles in a single XMLTYPE column with other relational columns (id, username, password) in the table. The XML is of the following format:
我正在使用 Oracle 的 XML DB 创建用户配置文件。我将用户配置文件与表中的其他关系列（id、用户名、密码）一起存储在单个 XMLTYPE 列中。XML 格式如下：
<profile>
<subject>I
<action>like
<object>sports</object>
...
<object>music</object
</action>
</subject>
</profile>
I used the following query,
我使用了以下查询，
SELECT *
FROM user,
XMLTABLE(
'//profile'
PASSING user.profile
return COLUMNS action VARCHAR2(20) PATH '/subject/action',
object VARCHAR2(30) PATH '/subject/action/object'
);
which gives me nothing. How could I make this thing work?
这给了我什么。我怎么能让这件事起作用？
回答by Vincent Malgrat
actionand objecton your example aren't on the same level, so your query has to perform additional steps. Here's an example:
action并且object在您的示例中不在同一级别，因此您的查询必须执行其他步骤。下面是一个例子：
SQL> create table users (id number, profile xmltype);
Table created.
SQL> insert into users values (1, XMLTYPE('<profile>
2 <subject>I
3 <action>like
4 <object>sports</object>
5 <object>music</object>
6 </action>
7 </subject>
8 </profile>'));
1 row created.
SQL> select u.id, x.action, x.object.getStringVal()
2 from users u,
3 XMLTABLE('/profile/subject/action'
4 passing u.profile
5 columns action VARCHAR2(30) PATH 'text()',
6 object XMLTYPE PATH 'object') x;
ID ACTION X.OBJECT.GETSTRINGVAL()
--- ------- --------------------------------------------------
1 like <object>sports</object> <object>music</object>
As you can see we got the node, not really what you want so we add an XMLTABLE:
正如你所看到的，我们得到了节点，并不是你想要的，所以我们添加了一个XMLTABLE：
SQL> select u.id, x.action, y.object
2 from users u,
3 XMLTABLE('/profile/subject/action'
4 passing u.profile
5 columns action VARCHAR2(30) PATH 'text()',
6 object XMLTYPE PATH 'object') x,
7 XMLTABLE('/object'
8 passing x.object
9 columns object VARCHAR2(30) PATH '.') y;
ID ACTION OBJECT
--- ------- -------
1 like sports
1 like music
