Oracle Pl/SQL: Loop through XMLTYPE nodes
I have a XMLTYPE with the following content:
<?xml version="1.0"?>
<users>
<user>
<name>user1</name>
</user>
<user>
<name>user2</name>
</user>
<user>
<name>user3</name>
</user>
</users>
How can I loop in PL/SQL through all the elements "user"? Thanks
您可以使用EXTRACT和XMLSequence循环遍历元素（将XML拆分为不同的块 - 这里是用户），如下所示：
SQL> SELECT extractvalue(column_value, '/user/name') "user"
2 FROM TABLE(XMLSequence(XMLTYPE(
3 '<?xml version="1.0"?>
4 <users>
5 <user>
6 <name>user1</name>
7 </user>
8 <user>
9 <name>user2</name>
10 </user>
11 <user>
12 <name>user3</name>
13 </user>
14 </users>').extract('/users/user'))) t;
user
--------
user1
user2
user3
You can use XQuery. Check out the select statement below. v_xml_doc is the XMLTYPE variable containing the XML data.
select name
from XMLTable('for $i in /users/user
return $i'
passing v_xml_doc
columns name varchar2(200) path 'name'
)
这个怎么样：
PROCEDURE xmltest IS
v_userlist XMLType;
v_count NUMBER(38) := 1;
BEGIN
/* define XML variable */
v_userlist := XMLType('<?xml version="1.0"?>
<users>
<user>
<name>user1</name>
</user>
<user>
<name>user2</name>
</user>
<user>
<name>user3</name>
</user>
</users>');
/* for each user, print out their name (each element can be extracted using xpath '//user[1]' '//user[2]' etc) */
WHILE v_userlist.existsNode('//user[' || v_count || ']') = 1 LOOP
dbms_output.put_line(v_userlist.extract('//user[' || v_count || ']/name/text()').getStringVal());
v_count := v_count + 1;
END LOOP;
END;
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