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A PPEN DI X O RA CLE D AT A BASE 11G S Q L AND PL/S QL: A BRI EF PRIME R
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</ItemDescriptions> </SalesOrder> SQL> Once you create the sales_catalog_table table, it s very easy to retrieve data using one of the methods I just described. The following example shows how to query the table using the extract() method. Note that the query includes XPath expressions and the SQL/XML operators extractValue and existsNode to find the requestor s name where the value of the /SalesOrder/SalesLocation/ text() node contains the value Dallas. SQL> SELECT extractValue(s.sales_order,'/SalesOrder/Requestor') 2 FROM sales_catalog_table s 3 WHERE existsNode(s.SALES_ORDER, 4* '/SalesOrder[SalesLocation="Dallas"]') = 1; EXTRACTVALUE(S.SALES_ORDER,'/SALESORDER/REQUESTOR') --------------------------------------------------Nina U. Alapati SQL>
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The Oracle XML DB Repository
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The best way to process XML documents in Oracle XML DB is to first load them into a special repository called the Oracle XML DB repository. The XML repository is hierarchical, like most XML data, and it enables you to easily query XML data. The paths and URLs in the repository represent the relationships among the XML data, and a special hierarchical index is used to traverse the folders and paths within the repository. The XML repository can hold non-XML data such as JPEG images, Word documents, and more. You can use SQL and PL/SQL to access the XML repository. XML authoring tools can directly access the documents in the XML repository using popular Internet protocols such as HTTP, FTP, and WebDAV. For example, you can use Windows Explorer, Microsoft Office, and Adobe Acrobat to work with the XML documents that are stored in the XML repository. XML is by nature documentcentric, and the XML repository provides applications with a file abstraction when dealing with XML data.
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Setting Up an XML Schema
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Before you can start using Oracle XML DB to manage XML documents, you need to perform the following tasks: 1. Create an XML schema. For example, SalesOrder, shown in Listing A-7, is a simple XML schema that reflects a simple XML document. Within the SalesOrder schema are elements such as ItemDescription, which provides details about the attributes of the component items. 2. Register the XML schema. After the XML schema is created, you must register it with the Oracle database using a PL/SQL procedure. When you register the XML schema, Oracle will create the SQL objects and the XMLType tables that are necessary to store and manage the XML documents. For the example shown in Listing A-6, registering the XML schema will create a table called SalesOrder automatically, with one row in the table for each SalesOrder document loaded into the XML repository. The XML schema is registered under the URL http:// localhost:8080/home/SCOTT/xdb/salesorder.xsd, and it contains the definition of the SalesOrder element.
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APPENDIX ORAC LE DATABA SE 11G S QL A ND PL/SQL: A BRIEF PRIMER
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Creating a Relational View from an XML Document
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Even if a developer doesn t know much XML, he or she can use the XML documents stored in the Oracle database by creating relational views based on the XML documents. The following example maps nodes in an XML document to columns in a relational view called salesorder_view: SQL> 2 3 4 5 6* CREATE OR REPLACE VIEW salesorder_view (requestor,description,sales_location) AS SELECT extractValue(s.sales_order,'/SalesOrder/Requestor'), extractValue(s.sales_order,'/SalesOrder/Sales_Location') FROM sales_Catalog_Table s ;
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View created. SQL> You can query salesorder_view like you would any other view in an Oracle database, as shown here: SQL> SELECT requestor,sales_location FROM salesorder_view; REQUESTOR SALES_LOCATION Aparna Alapati Dallas SQL>
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Oracle and Java
You can use both PL/SQL and Java to write applications that need Oracle database access. Although PL/SQL has several object-oriented features, the Java language is well known as an object-oriented programming language. If your application needs heavy database access and must process large amounts of data, PL/SQL is probably a better bet. However, for open distributed applications, Javabased applications are more suitable. The Oracle database contains a Java Virtual Machine (JVM) to interpret Java code from within the database. Just as PL/SQL enables you to store code on the server and use it multiple times, you can also create Java stored procedures and store them in the database. These Java stored procedures are in the form of Java classes. You make Java files available to the Oracle JVM by loading them into the Oracle database as schema objects. You can use the Java programming language in several ways in an Oracle database. You can invoke Java methods in classes that are loaded in the database in the form of Java stored procedures. You can also use two different application programming interfaces (APIs), Java Database Connectivity (JDBC) or SQLJ, to access the Oracle database from a Java-based application program. In the sections that follow, we ll briefly look at the various ways you can work with Java and the Oracle database.
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