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Also, consider the question of standard data definitions. While XML itself is a standard, two companies exchanging purchase orders formatted in XML will be unable to interpret each other s orders in the same way unless the tags used within the XML document have the same names and definitions. For example, if the first company uses the tag <product code> for the identifier of the product being ordered, and the second company uses <SKU> (stock keeping unit) instead, then the purchase orders cannot be interpreted in the same way. One of the emerging solutions is industry XML document coding standards, such as HR-XML, developed for the human resources industry by the HR-XML Consortium. This is likely to be parallel to the Enterprise Data Interchange (EDI) standards that were developed during the past two decades.
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The SQL standard specifies a number of functions that can be used to form column data into XML elements. A SQL/XML function (also called an XML value function) is simply a function that returns a value as an XML type. For example, a query can be written that selects non-XML data (that is, data stored in data types other than XML) and that formats the query results into an XML document suitable for display on a web page or transmission to some other party. Table 25-1 shows the basic SQL/XML functions.
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Function XMLAGG XMLATTRIBUTE XMLCOMMENT XMLCONCAT XMLDOCUMENT XMLELEMENT XMLFOREST XMLPARSE XMLPI XMLQUERY
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Value Returned A single XML value containing an XML forest formed by combining (aggregating) a collection of rows, each of which contains a single XML value An attribute in the form name=value within an XMLELEMENT An XML comment A concatenated list of XML values, creating a single value containing an XML forest An XML value containing a single document node An XML element, which can be a child of a document node, with the name specified in the name parameter An XML element containing a sequence of XML elements formed from table columns, using the name of each column as the corresponding element name An XML value formed by parsing the supplied string without validating it An XML value containing an XML processing instruction The result of an XQuery expression (XQuery is a sublanguage used to search XML stored in the database; it is discussed towards the end of this chapter.) An XML value containing a single XML text node, which can be a child of a document node
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TABLE 25-1
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PART VI
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An XML sequence that is the result of validating an XML value
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SQL/XML Functions
Part VI:
SQL Today and Tomorrow
There are more functions than those listed in Table 25-1, and SQL/XML functions can be used in combination to form extremely powerful (if not complicated) queries. Also, the functions available vary across SQL implementations. Here are simple examples to clarify how these functions can be used, using the XMLELEMENT and XMLFOREST functions:
SELECT XMLELEMENT("OrderNumber", ORDER_NUM) FROM ORDERS WHERE ORDER_NUM=112963; <OrderNumber>112963</OrderNumber> SELECT XMLFOREST(ORDER_NUM AS "OrderNumber", MFR, PRODUCT, QTY, AMOUNT) FROM ORDERS WHERE ORDER_NUM=112963; <OrderNumber>112963</OrderNumber><MFR>ACI</MFR><PRODUCT>41004</PRODUCT> <QTY>28</QTY><AMOUNT>3276</AMOUNT>
Notice that the XML element names are taken from the column names, in uppercase with underscores as is customary in SQL. However, using the column alias, as I did for the ORDER_NUM column, you can change the column names to just about anything you want.
XML Input
Just as XML can be used to represent a row of query results that is output from a database, XML can easily be used to represent a row of data to be inserted into a database. To process the XML data, the DBMS must analyze the XML document containing the data to be inserted and identify the individual data items (represented as either elements or attributes). The DBMS must then match (usually using column names) or translate (using a DBMS-specific scheme) the corresponding element or attribute names to columns in the target table that is to receive the new data. Conceptually, this simple INSERT statement:
INSERT INTO OFFICES (OFFICE, CITY, REGION, SALES) VALUES (23,'San Francisco','Western',0.00);
can be easily translated into an equivalent hybrid SQL/XML statement like this one:
INSERT WITH < xml version="1.0" > INTO OFFICES (OFFICE, CITY, REGION, SALES) VALUES <row> <office>23</office> <city>San Francisco</city> <region>Western</region> <sales>0.00</sales> </row>
Updates to the database can be similarly handled. This simple UPDATE statement:
UPDATE OFFICES SET TARGET = 200000.00, MGR = 108 WHERE OFFICE = 23;
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