.NET/ASP.NET/C#/VB.NET PDF Document SDK
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Oracle uses a special native data type called XMLType to store and manage XML data in a relational table. XMLType and XDBURIType, which is another built-in type for XML data, enable you to leave the XML parsing, storage, and retrieval to the Oracle database. You can use the XMLType data type just as you would the usual data types in an Oracle database. You can now store a well-formed XML document in the database as an XML test using the CLOB base data type. Here s an example of using the XMLType data type: SQL> CREATE TABLE sales_catalog_table 2 (sales_num number(18), 3 sales_order xmltype); Table created. SQL> DESC sales_catalog_table Name Null Type --------------------- ----- -------SALES_NUM NUMBER(18) SALES_ORDER XMLTYPE SQL> The XMLType data type comes with a set of XML-specific methods, which you use to work with XMLType objects. You can use these methods to perform common database operations, such as checking for the existence of a node and extracting a node. The methods also support several operators that enable you to access and manipulate XML data as part of a regular SQL statement. These operators follow the emerging SQL/XML standard. Using the well-known XPath notation, the SQL/XML operators traverse XML structures to find the node or nodes on which they should use the SQL operations. Here are some of the important SQL/XML operators: Extract() extracts a subset of the nodes contained in the XMLType. ExistsNode() checks whether a certain node exists in the XMLType. Validating() validates the XMLType contents against an XML schema.
Transform() performs an XSL transformation. ExtractValue() returns a node corresponding to an XPath expression. XML is in abstract form compared to the normal relational table entries. To optimize and execute statements that involve XML data, Oracle uses a query-rewrite mechanism to transform an XPath expression into an equivalent regular SQL statement. The optimizer then processes the transformed SQL statement like any other SQL statement. You can store XML in Oracle XML DB in the following ways: You can use SQL or PL/SQL to insert the data. Using XMLType constructors, you must first convert the sourced data into an XMLType instance. You can use the Oracle XML DB repository to store the XML data. Here s a simple example using the sales_catalog_table table to demonstrate how to perform SQL-based DML operations with an XML-enabled table. In Listing A-7, an XML document is inserted into sales_catalog_table. Listing A-7. Inserting an XML Document into an Oracle Table SQL> INSERT INTO sales_catalog_table 2 VALUES (123456, 3 XMLTYPE( 4 '<SalesOrder> 5 <Reference>Alapati - 200302201428CDT</Reference> 6 <Actions/> 7 <Reject/> 8 <Requestor>Nina U. Alapati</Requestor> 9 <User>ALAPATI</User> 10 <SalesLocation>Dallas</SalesLocation> 11 <ShippingInstructions/> 12 <DeliveryInstructions>Bicycle Courier</DeliveryInstructions> 13 <ItemDescriptions> 14 <ItemDescription ItemNumber="1"> 15 <Description>Expert Oracle DB Administration</Description> 16 <ISBN Number="1590590228"Price="59.95"Quantity="5"/> 17 </ItemDescription> 18 </ItemDescriptions> 19* </SalesOrder>')); 1 row created. SQL> You can query the sales_catalog_table table s sales_order column, as shown in Listing A-8, to view the XML document in its original format. Listing A-8. Viewing XML Data Stored in an Oracle Table SQL> SELECT sales_order FROM 2 sales_catalog_table; <SalesOrder> <Reference>Alapati - 200302201428CDT</Reference> <Actions/> <Reject/> <Requestor>Sam R. Alapati</Requestor> <User>ALAPATI</User> <SalesLocation>Dallas</SalesLocation> <ShippingInstructions/>
Conditional logic can become quite complex. The following example demonstrates two test expressions that must each evaluate as true before the additional code will run. In this case, the logical AND (&&) characters are used to perform two separate functions. The first instance of && is used to require both the first and second expressions to be true. The second instance is used to indicate the additional code that should be run if they both evaluate as true. The use of a logical OR (||) in both places is also valid, and specifies that both of the tests would need to be false to execute the additional code.