如何检查XML文档中是否存在给定节点?
XML示例:
<order>
<desc>
<name>Test name</name>
<code>Test code</code>
</desc>
<suborders>
<item>
<id>1000</id>
</item>
<item>
<id>2000</id>
</item>
</suborders>
<options>
<item/>
</options>
</order>
如果存在任何子订单项,如何检入PL / SQL?
我试过这样:
DECLARE
myxml CLOB := ...
BEGIN
SELECT extractValue(XMLTYPE(myxml), '/order/suborders/item[1]')
INTO firstSuborder
FROM DUAL;
IF (firstSuborder IS NULL) THEN
dbms_output.put_line('suborder doesnt exist');
END IF;
END;
但我得到ORA-19025: EXTRACTVALUE returns value of only one node
。
答案 0 :(得分:2)
您可以使用existsnode,这里是文档http://docs.oracle.com/cd/B19306_01/appdev.102/b14259/xdb04cre.htm#i1032763
declare
OBJECT_VALUE xmltype := xmltype(q'{<order>
<desc>
<name>Test name</name>
<code>Test code</code>
</desc>
<suborders>
<item>
<id>1000</id>
</item>
<item>
<id>2000</id>
</item>
</suborders>
<options>
<item/>
</options>
</order>}');
node_exists pls_integer;
begin
select existsNode(OBJECT_VALUE, '/order/suborders/item[1]') into node_exists from dual;
dbms_output.put_line('exists: ' || to_char(node_exists));
end;