XQuery Quick Start

This quick start provides basic information for getting started with DataDirect XQuery™ 3.0 immediately after installation. In addition, this quick start describes the DataDirect XQuery™ 3.0 command-line utility that is available for quickly running and testing XQueries through a console window.

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XQuery™ 3.0 Updates

DataDirect XQuery™ 3.0 supports updates to relational database tables from inside an XQuery by providing three built-in functions. These functions are: ddtek:sql-insert, ddtek:sql-update, ddtek:sql-delete. The DataDirect XQuery™ 3.0 update functionality requires extensions to the XQuery processing model for function declaration, XQuery expressions, and snapshot semantics.

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Updating Relational Data with XQuery™ 3.0 and JDBC

XQuery is ideal for querying and restructuring both XML and relational data, but XQuery updates are still in the planning stage. Using a combination of DataDirect XQuery™ 3.0, which is DataDirect's implementation of XQuery for Java API (XQJ), and JDBC offers a simple solution to working with both XML and relational data, and providing updates to relational data.

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Resolving fn:collection() Errors

No standard way exists to access a relational table in XQuery, so each XQuery implementation defines its own way to do this. DataDirect XQuery™ 3.0 uses fn:collection() to access a relational table. This paper provides guidelines to help you troubleshoot and correct common causes of errors that occur when using fn:collection() in an XQuery query.

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Update on XQJ: XQuery API for Java

XQJ enables a Java application to submit XQuery queries to an XML data source and process the results. XQJ is analogous to JDBC, which in conventional SQL environments, a Java application uses to connect to a database, issue SQL queries, and obtain result sets. So, XQJ is to XQuery what JDBC is to SQL.

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JDBC Pooling

Connection pooling allows your application to reuse connections. DataDirect XQuery™ 3.0 supports connection pooling through JDBC. Learn how to configure JDBC connection pool managers in several popular application server environments including Tomcat, JBoss, BEA WebLogic, and IBM WebSphere Application Server.

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