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Composing An XML doc From Relational facts, half 1

My boss requested me if i know of an affordable or free device that can immediately export a DB2 (for i) table to an XML file. I advised him that I may write a Java software fairly quite simply that may accomplish this for a particular desk, however I’m now not aware of any option to “generically” do it for any table.

as an example:

opt for * from deleteme TheKey SomeText 1 Row number one 2 Row number 2

That code should still produce output whatever thing like this:

<?xml version="1.0" encoding="UTF-eight" ?> <deleteme> <row> <TheKey>1</TheKey> <SomeText>Row number 1</SomeText> </row> <row> <TheKey>2</TheKey> <SomeText>Row number 2</SomeText> </row> </deleteme>

I’m fairly sure the DB2 utility from QSH may likely do that, however I don’t understand how to do it. were you aware of an easy way to accomplish this on DB2 for i? Thanks!

–D.F.

I’m no longer privy to any free tool to accomplish this. in reality, even the newest IBM iAccess tools (including the file switch utility and the RunSQL “retailer consequences as”) fail to give this variety of save as XML option.

I believe a part of the intent IBM hasn’t given us a way to do that is because providing XML as an export alternative opens up an entire can of worms. consider about it: Do you want to export your records as facets? How about as attributes or a mixture of each? What do you want to call your root point and what case may still or not it's?

IBM might likely make this work for single table flat facts, however what when you have diverse tables in a query? What in case you’re becoming a member of customers with income orders and you desire the sales records nested in the consumer information? With XML, the export alternatives are limitless and having the user configure an XML export can be a little daunting.

however, DB2 for i 7.1 contains full support for creating XML files essentially any means you want. whereas there is no customary utility in DB2 to do that category of conversion automatically, the SQL required to construct an XML is an easy pattern that can be molded into a customary utility.

For now, I’ll cowl the way to use the new XML facets to build a simple XML from relational facts. beneath is the bottom SQL facts retrieval remark:

-- Base question select PRODUCTID,name,PRODUCTNUMBER,color FROM ADVWORKS.PRODUCT ORDER by way of name

The ensuing XML should still look like this:

<?xml edition="1.0" encoding="UTF-8" ?> <products> <Product> <ProductId>1</ProductId> <identify>Adjustable Races</identify> <ProductNumber>AR-5381</ProductNumber> </Product> <Product> <ProductId>352</ProductId> <identify>entrance Derailleur Linkage</name> <ProductNumber>FL-2301</ProductNumber> <colour>Silver</color> </Product> </items>

author’s notice: Column color is nullable and hence doesn’t appear in the XML when it is null.

And now we’ll radically change the base question to build the XML doc. the primary thing to do when converting table row records to XML features is to use the XMLROW characteristic.

-- Step 1: Convert a tabular row to an equivalent "XMLROW" opt for XMLROW(PRODUCTID AS "ProductId",name AS "name",PRODUCTNUMBER AS "ProductNumber",color AS "color" alternative ROW "Product") AS XML_ROW FROM ADVWORKS.PRODUCT ORDER via name

XMLROW accepts a list of columns and returns an XML fragment. every column name passed to the characteristic should be converted to an XML element with its facts as the element cost. during this case, I need the aspect names to be blended case so I aliased the column names in the characteristic. at last, choice ROW is used to outline a parent point. The factor “Product” can be a “father or mother factor,” and the entire column points are “newborn elements.”

The influence of this question now looks like this (most effective a few sample rows are proven here):

XML_ROW

<Product><ProductId>712</ProductId><name>AWCLogoCap</name><ProductNumber>CA-1098</ProductNumber><colour>Multi</color></Product>

<Product><ProductId>1</ProductId><identify>AdjustableRaces</identify><ProductNumber>AR-5381</ProductNumber></Product>

At this aspect, there is only one column in the influence set (called XML_ROW) that contains the requested statistics as XML facets. but due to the fact that the intention is for the entire information to be placed in a single XML document, the question may still return only one row with one XML column.

So the subsequent step is to combine all of the XML rows into a single row and column. aggregate function XMLAGG (XML mixture) can mix the XML information from the entire product rows to create a single column:

-- Step 2: mixture all rows (ORDER by means of goes in nested table expression) choose XMLAGG(XMLROW(PRODUCTID AS "ProductId",identify AS "name", PRODUCTNUMBER AS "ProductNumber",color AS "color"choice ROW "Product") ) AS XML_AGG FROM (opt for * FROM ADVWORKS.PRODUCT ORDER by means of identify) PRODUCT

due to the fact that XMLAGG is an aggregate feature it can be used identical to another mixture function with a gaggle through. notwithstanding during this case, aggregating the XML of all the rows doesn’t require a bunch by using. The input to the XMLAGG characteristic is the result of the XMLROW feature; each and every XMLROW is concatenated into one gigantic string. The abridged outcome set containing only 1 row and one column feels like this:

XML_AGG

<Product><ProductId>1</ProductId><name>AdjustableRaces</identify><ProductNumber>AR-5381</ProductNumber></Product>

<Product><ProductId>2</ProductId><identify>BearingBall</name><ProductNumber>BA-8327</ProductNumber></Product>

creator’s be aware: There is no white house inserted within the XML; I inserted the road breaks for readability.

With an aggregate query, the ORDER by means of cannot specify a column that is not in the opt for listing. for this reason, to hold the ordering of the records within the XML, the base query become converted to a nested desk expression.

An XML doc has just one root point. The next step to polish off the XML is so as to add a root element named “items”. The XMLELEMENT characteristic can be used to define an element. This function accepts two inputs: an element name and its cost. in the question beneath, the identify given to their root aspect is “products” and the value goes to be the outcomes of the XMLAGG combination characteristic:

-- Step 3: Add root element choose XMLELEMENT(name "items", XMLAGG(XMLROW(PRODUCTID AS "ProductId",name AS "name",PRODUCTNUMBER AS "ProductNumber",color AS "color" alternative ROW "Product")) ) AS XML_DOCUMENT FROM (opt for * FROM ADVWORKS.PRODUCT ORDER through name) PRODUCT

The abridged influence looks like this (the same effect as the prior question with the exception that there is now a root factor):

XML_DOCUMENT

<items>

<Product><ProductId>1</ProductId><name>AdjustableRaces</name><ProductNumber>AR-5381</ProductNumber></Product>

<Product><ProductId>2</ProductId><identify>BearingBall</name><ProductNumber>BA-8327</ProductNumber></Product>

<items>

once more, the road breaks had been brought to the XML for readability. The exact outcomes is one lengthy string without a line breaks.

The XML is now near the one proven above. The ultimate merchandise so as to add is the XML statement (i.e., <?xml version=”1.0″ encoding=”UTF-8″?>) to the beginning of the XML doc. The XMLSERIALIZE characteristic will perform this project for us:

-- Step 4: Add the XML statement opt for XMLSERIALIZE(XMLELEMENT(identify "items", XMLAGG(XMLROW(PRODUCTID AS "ProductId",identify AS "name", PRODUCTNUMBER AS "ProductNumber",colour AS "colour" alternative ROW "Product"))) AS CLOB(1M) together with XMLDECLARATION) AS XML_DOCUMENT FROM (opt for * FROM ADVWORKS.PRODUCT ORDER through identify) PRODUCT

XMLSERIALIZE accepts an XML enter parameter, and may optionally add an XML assertion to it and cast the complete outcome to a string or binary price. in this case the input is every little thing we’ve already performed to this element (an aggregate of XML fragments for each and every row in the products desk combined with a root factor). The abridged outcomes now seems like this:

XML_DOCUMENT

<?xmlversion=”1.0″ encoding=”UTF-8″?>

<products>

<Product><ProductId>1</ProductId><name>AdjustableRaces</name><ProductNumber>AR-5381</ProductNumber></Product>

<Product><ProductId>2</ProductId><identify>BearingBall</identify><ProductNumber>BA-8327</ProductNumber></Product>

<products>

as a result of the feature nesting, the SQL statements that generate XML can get a little messy. youngsters, it’s fairly handy to be mindful at each step how these features work and it's truly price the small time funding to find out how to assemble XML with DB2 for i. IBM has executed an excellent job in giving developers a flexible strategy to building XML.

Attribute based mostly XML

One essential adaptation I wish to introduce is how to create an attribute based mostly XML outcomes as an alternative of a part based XML. The code is exactly the same aside from the addition of the AS ATTRIBUTES option. Backing up to the first step within the question:

-- Step 1A (option) - Attribute based opt for XMLROW(PRODUCTID AS "ProductId",name AS "identify",PRODUCTNUMBER AS "ProductNumber",colour AS "colour" option ROW "Product" AS ATTRIBUTES) AS XML_ROW

The abridged result now feels like this:

XML_ROW

<Product ProductId=”712″ identify=”AWC emblem Cap” ProductNumber=”CA 1098″colour=”Multi”/>

<Product ProductId=”1″ name=”Adjustable Races”ProductNumber=”AR 5381″/>

each column given to XMLROW is now rendered as an attribute cost in its place of an element. Attribute based XML is smaller than aspect based XML because the ending element tag isn’t required. For my small statistics set, the XML size was reduced from about 63K (aspect based mostly) to 42K (attribute primarily based).

For reusability, it’s possible to create a view producing the desired XML as follows:

CREATE VIEW ADVWORKS.PRODUCT_XML AS opt for XMLSERIALIZE(XMLELEMENT(identify "products", XMLAGG(XMLROW(PRODUCTID AS "ProductId",identify AS "name", PRODUCTNUMBER AS "ProductNumber",colour AS "color" choice ROW "Product"))) AS CLOB(1M) including XMLDECLARATION) AS XML_DOCUMENT FROM (opt for * FROM ADVWORKS.PRODUCT ORDER by name) PRODUCT

From here, the QShell DB2 utility will also be used to dump the results of the XML to an IFS file:

db2 choose xml_document from advworks.product_xml >/tmp/products.xml

despite the fact, the DB2 utility includes headings and a row count that should be stripped out to make the effect constructive. for this reason, I definitely choose the use of RPG and either the CLOB_FILE SQL information class or the IFS APIs to dump the XML facts at once to the IFS.

while it’s no longer the prettiest issue to examine, it's possible to assemble a utility that accepts a simple SQL observation and adds the essential XML capabilities with a view to get the desired XML effect.

In a future tip, I’ll exhibit a way to assemble an XML doc from distinctive tables where nesting is required.

Michael Sansoterra is a DBA for Broadway methods in Grand Rapids, Michigan. send your questions or feedback for Mike by way of the IT Jungle Contact page.

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