Get position of xml-tag in clob
Hi,
Is it possible to get the offset in a clob, representing an xml, by using xml functionality? (function or xmltable)
For example, with a clob:
v_clob := '<a><b type="1">val1</b><b type="2">val2</b></a>';I would like a function like:
v_offset := xml_offset(v_clob,'/a/b[@type="2"]');With a result of 24 to get the tag, or 35 when asking for the actual value.
Thanks,
Jan
Edited by: BluShadow on 16-Jan-2013 15:22
added {noformat}{noformat} tags for readability. Please see {message:id=9360002} and learn to do this yourself in future.
p.s. if you have an unknown XML structure and you need to parse it somehow, then you will likely be best using the DBMS_XMLDOM package and treating it as a DOM document so that you can recurse the hierarchy of tags, picking out the attributes and data as you go.
ETA: Example from my library of examples...
declare
v_xml XMLTYPE := XMLTYPE('<csg>
<ecrminput id="000000001">
<xml id="001" title="CustomerId">blah blah blah</xml>
<xml id="002" title="ContactId">blah blah blah</xml>
<xml id="003" title="CustomerNo">blah blah blah0</xml>
<xml id="500" title="Attribute">blah blah blah</xml>
<xml id="500" title="Attribute">blah blah blah</xml>
<xml id="1027" title="Reservation Code">blah blah blah</xml>
<xml id="1028" title="Payment Reference">blah blah blah</xml>
<xml id="1029" title="Purchaser Customer Number">blah blah blah</xml>
</ecrminput>
<ecrminput id="000000002">
<xml id="001" title="CustomerId">blah blah blah</xml>
<xml id="002" title="ContactId">blah blah blah</xml>
<xml id="500" title="Attribute">blah blah blah</xml>
<xml id="500" title="Attribute">blah blah blah</xml>
<xml id="1027" title="Reservation Code">blah blah blah</xml>
<xml id="1028" title="Payment Reference">blah blah blah</xml>
<xml id="1029" title="Purchaser Customer Number">blah blah blah</xml>
<xml id="1016" title="Call ID">blah blah blah</xml>
</ecrminput>
</csg>');
v_xsdoc DBMS_XMLDOM.DOMDocument;
v_dn DBMS_XMLDOM.DOMNode;
PROCEDURE processnode; -- forward declaration
PROCEDURE processattributes IS
nm DBMS_XMLDOM.DOMNamedNodeMap;
attr DBMS_XMLDOM.DOMAttr;
attnode DBMS_XMLDOM.DOMNode;
attname VARCHAR2(50);
attval VARCHAR2(250);
BEGIN
nm := DBMS_XMLDOM.GetAttributes(v_dn);
FOR i IN 0..DBMS_XMLDOM.GetLength(nm)-1
LOOP
attnode := DBMS_XMLDOM.Item(nm, i);
attr := DBMS_XMLDOM.MakeAttr(attnode);
attname := DBMS_XMLDOM.GetName(attr);
attval := DBMS_XMLDOM.GetValue(attr);
dbms_output.put_line('Attribute: '||attname||' Value: '||attval);
END LOOP;
END;
PROCEDURE parse_node_element IS
eltype VARCHAR2(100);
BEGIN
eltype := DBMS_XMLDOM.GetTagName(DBMS_XMLDOM.MakeElement(v_dn));
dbms_output.put_line('Tag: '||eltype);
processattributes;
processnode;
END;
PROCEDURE parse_node_text IS
BEGIN
DBMS_OUTPUT.PUT_LINE('Text: '||DBMS_XMLDOM.GetNodeValue(v_dn));
END;
PROCEDURE processnode IS
dnl DBMS_XMLDOM.DOMNodeList;
nt PLS_INTEGER;
BEGIN
dnl := DBMS_XMLDOM.GetChildNodes(v_dn);
dbms_output.put_line('Child Nodes Found: '||DBMS_XMLDOM.GetLength(dnl));
IF NOT DBMS_XMLDOM.IsNull(dnl) THEN
FOR i IN 0 .. (DBMS_XMLDOM.GetLength(dnl) - 1)
LOOP
v_dn := DBMS_XMLDOM.Item(dnl, i);
nt := DBMS_XMLDOM.GetNodeType(v_dn);
CASE
WHEN nt = DBMS_XMLDOM.ELEMENT_NODE THEN
parse_node_element;
WHEN nt IN (DBMS_XMLDOM.TEXT_NODE) THEN
parse_node_text();
ELSE
NULL; -- Unhandled node type;
END CASE;
END LOOP;
END IF;
END;
BEGIN
v_xsdoc := DBMS_XMLDOM.NewDOMDocument(v_xml);
v_dn := DBMS_XMLDOM.GetFirstChild(DBMS_XMLDOM.MakeNode(v_xsdoc)); -- <csg>
processnode;
END;
Child Nodes Found: 2
Tag: ecrminput
Attribute: id Value: 000000001
Child Nodes Found: 8
Tag: xml
Attribute: id Value: 001
Attribute: title Value: CustomerId
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 002
Attribute: title Value: ContactId
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 003
Attribute: title Value: CustomerNo
Child Nodes Found: 1
Text: blah blah blah0
Tag: xml
Attribute: id Value: 500
Attribute: title Value: Attribute
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 500
Attribute: title Value: Attribute
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1027
Attribute: title Value: Reservation Code
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1028
Attribute: title Value: Payment Reference
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1029
Attribute: title Value: Purchaser Customer Number
Child Nodes Found: 1
Text: blah blah blah
Tag: ecrminput
Attribute: id Value: 000000002
Child Nodes Found: 8
Tag: xml
Attribute: id Value: 001
Attribute: title Value: CustomerId
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 002
Attribute: title Value: ContactId
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 500
Attribute: title Value: Attribute
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 500
Attribute: title Value: Attribute
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1027
Attribute: title Value: Reservation Code
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1028
Attribute: title Value: Payment Reference
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1029
Attribute: title Value: Purchaser Customer Number
Child Nodes Found: 1
Text: blah blah blah
Tag: xml
Attribute: id Value: 1016
Attribute: title Value: Call ID
Child Nodes Found: 1
Text: blah blah blah
PL/SQL procedure successfully completed.Edited by: BluShadow on 16-Jan-2013 15:28
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