使用oracle解析器从XML获取First Occurred值

我不是Oracle的专家,但根据要求,我使用Oracle Parser解析Xml.对于下面列出的xml即

<?xml version="1.0" encoding="iso-8859-1" ?>
<SearchOutput>
<rowArray>
    <Row>
        <cellArray>
            <Cell>
                <columnId>1</columnId>
                <valueArray>
                    <Value>
                        <value>IR000024575453</value>
                    </Value>
                </valueArray>
            </Cell>
            <Cell>
                <columnId>5</columnId>
                <valueArray>
                    <Value>
                        <value>AZ12604823-001</value>
                    </Value>
                </valueArray>
            </Cell>
            <Cell>
                <columnId>2</columnId>
                <valueArray>
                    <Value>
                        <value>IT06686</value>
                    </Value>
                </valueArray>
            </Cell>
            <Cell>
                <columnId>9</columnId>
                <valueArray>
                    <Value>
                        <value>Hu Mics Metab K</value>
                    </Value>
                </valueArray>
            </Cell>
            <Cell>
                <columnId>8</columnId>
                <valueArray>
                    <Value>
                        <value>2006-06-21</value>
                    </Value>
                </valueArray>
            </Cell>
            <Cell>
                <columnId>7</columnId>
                <valueArray>
                    <Value>
                        <value>2006-07-27</value>
                    </Value>
                </valueArray>
            </Cell>
        </cellArray>
    </Row>
</rowArray>
</SearchOutput>

我使用过该方法,其中l_xmlclob具有CLOB数据类型并在上面分配了xml.

FOR r IN (  SELECT rownum rn,cells
           FROM xmltable('/SearchOutput/rowArray/Row' passing XMLTYPE(l_xmlclob)
                                     columns CELLS  XMLTYPE PATH './cellArray')
        )
 LOOP
  DBMS_OUTPUT.PUT_LINE('Row: '||r.rn);      

  FOR c IN ( SELECT colid,colval
               FROM xmltable('/cellArray/Cell' passing r.cells
                                               columns COLID NUMBER PATH './columnId',COLVAL VARCHAR(20) PATH     './valueArray/Value/value')
           )
  LOOP
     DBMS_OUTPUT.PUT_LINE('colid,col value: '||c.colid||','||c.colval);
  END LOOP;
 END LOOP;

它的工作正常,它的输出就像

Row: 1
colid,col value: 1,IR000024575453
colid,col value: 5,AZ12604823-001
colid,col value: 2,IT06686
colid,col value: 9,Hu Mics Metab K
colid,col value: 8,2006-06-21
colid,col value: 7,2006-07-27

但是如果在xml中一个接一个地存在两个值并且我想仅选择第一个出现,即下面的xml,则会出现问题

<?xml version="1.0" encoding="iso-8859-1" ?>
<SearchOutput>
<rowArray>
<Row>
    <cellArray>
        <Cell>
            <columnId>1</columnId>
            <valueArray>
                <Value>
                    <value>Uganda</value>
                </Value>
                <Value>
                    <value>Italy</value>
                </Value>
            </valueArray>
        </Cell>
        <Cell>
            <columnId>5</columnId>
            <valueArray>
                <Value>
                    <value>AZ12604823-001</value>
                </Value>
            </valueArray>
        </Cell>
        <Cell>
            <columnId>2</columnId>
            <valueArray>
                <Value>
                    <value>IT06686</value>
                </Value>
            </valueArray>
        </Cell>
        <Cell>
            <columnId>9</columnId>
            <valueArray>
                <Value>
                    <value>Hu Mics Metab K</value>
                </Value>
            </valueArray>
        </Cell>
        <Cell>
            <columnId>8</columnId>
            <valueArray>
                <Value>
                    <value>2006-06-21</value>
                </Value>
            </valueArray>
        </Cell>
        <Cell>
            <columnId>7</columnId>
            <valueArray>
                <Value>
                    <value>2006-07-27</value>
                </Value>
                <Value>
                    <value>2012-02-27</value>
                </Value>
            </valueArray>
        </Cell>
    </cellArray>
</Row>
</rowArray>
</SearchOutput>

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