Getting Started with DB2 Express-C

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280 Getting Started with DB2 Express-C xquery { for $y in db2-fn:xmlcolumn(‘CLIENTS.CONTACT’)/Client/Address order by $y/zip return {$y} } Listing 15.17 - XQuery statement with the FLWOR expression returning HTML The sample HTML returned would look as shown in Listing 15.18. 9407 Los Gatos Blvd. Los Gatos ca 95302 4209 El Camino Real Mountain View CA 95302 ... Listing 15.18 - Output of the query ran in Listing 15.17 Example 4 The following example shows how to embed SQL within XQuery by using the db2- fn:sqlquery function. The db2-fn:sqlquery function executes an SQL query and returns only the selected XML data. The SQL query passed to db2-fn:sqlquery must only return XML data. This XML data can then be further processed by XQuery. This is illustrated in Listing 15.19. xquery for $y in db2-fn:sqlquery( ‘select comments from items where srp > 100’ )/Comments/Comment
Chapter 15 - DB2 pureXML 281 where $y/ResponseRequested=‘Yes’ return ( {$y/ProductID $y/CustomerID $y/Message} ) Listing 15.19 - An example of the db2-fn:sqlquery function embedding SQL within XQuery In the example, the SQL query filters rows based on the condition that the srp column has a value greater than 100. From those rows filtered, it will pick the comments column, which is the XML column. Next XQuery (or XPath) is applied to go to sub-elements. Note: SQL is case insensitive and DB2 stores all table and column names in uppercase by default. XQuery on the other hand, is case sensitive. The above functions are XQuery interface functions so all the table names and column names should be passed to these functions in uppercase. Passing the object names in lowercase may result in an undefined object name error. 15.3.6 Joins with SQL/XML This section describes how to perform JOIN operations between two XML columns of different tables, or between one XML column and one relational column. Assume you have created two tables with the statements shown in Listing 15.20 CREATE TABLE dept (unitID CHAR(8), deptdoc XML) CREATE TABLE unit (unitID CHAR(8) primary key not null, name CHAR(20), manager VARCHAR(20), ... ) Listing 15.20 - DDL of tables to use in the JOIN examples You can perform a JOIN operation in either of two ways. The first method is shown in Listing 15.21. SELECT u.unitID FROM dept d, unit u WHERE XMLEXISTS ( ‘$e//employee[name = $m]’ passing d.deptdoc as “e”, u.manager as “m”) Listing 15.21 - First method to perform a JOIN with SQL/XML
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GETTING STARTED WITH DB2 Express-C
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Contents About this book ..........
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Contents 7 6.3 DB2 storage model ..
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Contents 9 13.4.2 Cursor stability
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About this book Notices and tradema
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About this Book 13 A book for the c
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About this Book 15 Foreword Innovat
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1 Chapter 1 - What is DB2 Express-C
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Chapter 1 - What is DB2 Express-C?
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1.8 Moving up to another DB2 editio
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4 Chapter 4 - DB2 Environment The D
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Chapter 4 - DB2 Environment 61 Figu
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Chapter 4 - DB2 Environment 69 conf
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Chapter 4 - DB2 Environment 73 Tabl
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Chapter 4 - DB2 Environment 75 4.3
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Chapter 4 - DB2 Environment 77 6. S
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6 Chapter 6 - DB2 Architecture In t
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8 Chapter 8 - Working with Database
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9 Chapter 9 - Data Movement Utiliti
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Chapter 9 - Data Movement Utilities
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11 Chapter 11 - Backup and Recovery
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11.4 Database logging from the Cont
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13 Chapter 13 - Concurrency and Loc
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Chapter 13 - Concurrency and Lockin
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Getting Started with DB2 Express-C

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