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There are many reasons why you should avoid references, in general. Since references ultimately point to object rows in tables, all the reasons to avoid objects as a storage mechanism are applicable to references as well (as discussed in the section Using Objects to Store Data [Not Recommended] of 8). The following are some additional reasons for you to consider: References can complicate your code considerably. For example, if you want to write a hierarchical query that retrieves all child and parent records in a table, you can do so easily using the connect by clause for a traditional parent/child table. But if you use references instead, you will have to dereference each record separately, resulting in complicated and slow code. References result in extra information being stored in tables (see the section Storage Size of Refs in 8 of Oracle Database Application Developer s Guide Object Relational Features (10g Release 1). This takes up extra space, which you can avoid by adopting a design that uses simple parent/child relational tables. Performing DML operations with references can be complex and result in slow-running code, as you ll see shortly. In return for all the complexity and performance degradation, you don t get any particular benefit when using references. That discussion concludes the brief introduction to references. Even though references are not a very useful feature for the reasons mentioned in this section, we ll cover JDBC access techniques for completeness and so that you can deal with them if you encounter them in code. In the next section, we ll examine how you can use references in your JDBC code.

As in the case of object types and collections, Oracle gives you the option of using weakly typed reference classes (java.sql.Ref or oracle.sql.REF) in your JDBC application. You can also use custom classes created by the now familiar utility JPublisher. In the next two sections we ll look at both options. We ll begin with a discussion of how to use weakly typed Ref and REF interfaces to query references in your JDBC programs.

If you change to source view, you will see very straightforward markup, and there isn t a whole lot of it certainly not enough to render the calendar, much less the interactivity of selecting dates and paging backward and forward through the months. You can see the markup in Figure 2-2.

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The Ref interface is implemented (partially, as you will soon discover) and extended by the Oracle class oracle.sql.REF. The Ref interface consists of the following methods. The following method gets the fully qualified base SQL name of the object type to which the reference points (e.g., BENCHMARK.EMP_REF_TYPE): public String getBaseTypeName() throws SQLException; The following method retrieves the SQL object type referenced by this Ref object: public String getObject() throws SQLException; If the connection s type map has an entry for the structured type, the instance will be custommapped to the Java class indicated in the type map. Otherwise, the structured type instance will be mapped to a Struct object. As you will see, this method does not work for Oracle 10g Release 1 or Oracle9i Release 2. Instead, you have to use the Oracle proprietary method get Value(), which is available in the REF class that extends the Ref interface. The following method retrieves the referenced object and maps it to a Java type based on the supplied type map: public String getObject( Map typeMap ) throws SQLException; The following method sets the value pointed to by this Ref object to the supplied object: public String setObject( Object refObject ) throws SQLException; The REF class in the oracle.sql package implements the Ref interface partially and adds many proprietary methods. Some of the more commonly used methods are public String getValue() throws SQLException; public String getValue( Map typeMap ) throws SQLException; As mentioned in the Ref section, the method getObject() in Oracle does not work as yet; it gives the unsupported feature exception. Instead, you need to use the REF counterpart getValue() or its overloaded version, which provides the same functionality. In the next section, we provide an example of how to query and update Ref objects.

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