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PODB2 UPDATE stored proc looping through INPUT XML
 

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    <p>I'm new to DB2 and stored procedures. I want to write a stored procedure in DB2 which will update the table. The procedure has an XML document as its input parameter. </p> <p>I need to loop through each record of XML, pick some nodes and update corresponding rows in table. This stored procedure will be used to batch update the table. </p> <p>I have the pseudo code for procedure, but not sure how it will look in DB2.</p> <p>The INPUT XML is of the FORMAT </p> <pre><code>&lt;Root&gt; &lt;Record&gt; &lt;a&gt;1234&lt;/a&gt; &lt;b&gt;1&lt;/b&gt; &lt;c&gt;2&lt;/c&gt; &lt;d&gt;A&lt;/d&gt; &lt;e&gt;B&lt;/e&gt; &lt;f&gt;C&lt;/f&gt; &lt;/Record&gt; &lt;Record&gt; &lt;a&gt;1235&lt;/a&gt; &lt;b&gt;1&lt;/b&gt; &lt;c&gt;2&lt;/c&gt; &lt;d&gt;A&lt;/d&gt; &lt;e&gt;B&lt;/e&gt; &lt;f&gt;C&lt;/f&gt; &lt;/Record&gt; &lt;/Root&gt; </code></pre> <p>The procedure will be similar to</p> <pre><code>CREATE PROCEDURE UPDATE_BATCH (IN INDOC XML) P1: BEGIN FOR rec AS rec CURSOR FOR( SELECT Record.XMLQUERY('//Record/a/text()') AS A, Record.XMLQUERY('//Record/b/text()') AS B, Record.XMLQUERY('//Record/c/text()') AS C, Record.XMLQUERY('//Record/d/text()') AS D, Record.XMLQUERY('//Record/e/text()') AS E, Record.XMLQUERY('//Record/f/text()') AS F FROM TABLE (INDOC)Record--Not Sure how to construct table from input xml ) DO UPDATE XYZ.TEMP_TABLE SET ACOL=Record.A, BCOL=Record.B, CCOL=Record.C, DCOL=Record.D, ECOL=Record.E WHERE FCOL=Record.F; END FOR; END P1 </code></pre> <p>Please help me to create above procedure. I'm not able to get correct syntax for ForEach, XML node handling, CURSOR and LOOPING in DB2.</p> <p><strong>ANSWER</strong></p> <pre><code>CREATE PROCEDURE UPDATE_BATCH(IN DOC XML) BEGIN MERGE INTO XYZ.TEMP_TABLE AS T USING (SELECT X.* FROM XMLTABLE('$d/Root/Record' passing DOC as "d" COLUMNS "A" VARCHAR(10) PATH 'a', "B" VARCHAR(10) PATH 'b', "C" VARCHAR(10) PATH 'c', "D" VARCHAR(10) PATH 'd', "E" VARCHAR(10) PATH 'e', "F" VARCHAR(10) PATH 'f' ) AS X) AS XT ON T.FCOL=XT."F" WHEN MATCHED THEN UPDATE SET T.ACOL=XT."A", T.BCOL=XT."B", T.COL=XT."C" END </code></pre>
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    1. COwhat's your db2 version?
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    2. COI'm using DB2 Express-C 9.7.5
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    3. COThanks for showing the answer that worked for you.
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