Need help in XML data processing

Question

Hi All,
I have to process a stored procedure's input parameter which comes as a string in the XML format.
Ex:
<Search>
<Row1>
<Table1>Tab1</Table1>
<Column1>col1</Column1>
<Operator1>op1</Operator1>
<Value1>val1</Value1>
</Row1>
<Row2>
<Table2>Tab2</Table2>
<Column2>col2</Column2>
<Operator2>op2</Operator2>
<Value2>val2</Value2>
</Row2>
</search>
I should process the above parameter and build a select query from each row.
Ex: select * from Tab1 where col1 op1 val1;
How can i achieve this?
i am using oracle 11g version.
Thanks in advance to all.

Answer 1

Your xml is not "well-formed" as every tag has a separate name (the numbering part in Row1, Row2 etc.), i would expect it as
<Search>
  <Row>
    <Table>Tab1</Table>
    <Column>col1</Column>
    <Operator>op1</Operator>
    <Value>val1</Value>
  </Row>
  <Row>
    <Table>Tab2</Table>
    <Column>col2</Column>
    <Operator>op2</Operator>
    <Value>val2</Value>
  </Row>
</Search>Anyway, this would do what you want:
WITH DATA AS (SELECT XMLTYPE('<Search>
                              <Row1>
                              <Table1>Tab1</Table1>
                              <Column1>col1</Column1>
                              <Operator1>op1</Operator1>
                              <Value1>val1</Value1>
                              </Row1>
                              <Row2>
                              <Table2>Tab2</Table2>
                              <Column2>col2</Column2>
                              <Operator2>op2</Operator2>
                              <Value2>val2</Value2>
                              </Row2>
                              </Search>') xml
                FROM DUAL
SELECT 'SELECT * FROM ' || TAB || ' WHERE ' ||COL || ' ' || OPER || ' ' || VALUE
  FROM (SELECT EXTRACTVALUE(xml, '/Search/Row' || LEVEL || '/Table' || LEVEL) TAB,
               EXTRACTVALUE(xml, '/Search/Row' || LEVEL || '/Column' || LEVEL) COL,
               EXTRACTVALUE(xml, '/Search/Row' || LEVEL || '/Operator' || LEVEL) OPER,
               EXTRACTVALUE(xml, '/Search/Row' || LEVEL || '/Value' || LEVEL) VALUE
          FROM DATA
          CONNECT BY LEVEL<100
WHERE TAB IS NOT NULL