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Almost every Java developer in the universe has used JDBC to persist data to a database. If your code also uses the DAO pattern, then migrating to the EJB 3 JPA may be a relatively painless process. Migration from JDBC requires three major tasks:

Identify your entities. Change the DAO implementation classes to use the EntityManager API to perform entity operations instead of using JDBC. Migrate your SQL queries to use JPQL and the EntityManager API.

ret } .method assembly static void modopt(System.Runtime.CompilerServices.CallConvStdcall) fManaged2() cil managed { .vtentry 2 : 1 .maxstack 1 ldstr call ret } Both functions in this ILDASM output have a line starting with .vtentry. This .vtentry instruction is used to define data structures that are needed for method calls from native code to managed code. The term vtentry stands for vtable entry, because these data structures, like vtables for C++ classes, are arrays of function pointers. In further explanations, I will refer to these data structures as interoperability vtables. For each of the global functions fManaged and fManaged2, a separate interoperability vtable with just one element is created. The instruction .vtentry 1 : 1 in fManaged specifies that a native client can call fManaged by calling the address in the first slot of the first interoperability vtable. For fManaged2, the .vtentry instruction specifies that the first slot of the second vtable should be called. Interoperability vtables have a fixed location in the assembly, and they are initialized when the assembly (in this case, the sample application) is loaded. All information necessary for the initialization of the interoperability vtables can be found in the assembly manifest. Here is the interesting part of the sample application s assembly manifest: // Image ... .vtfixup .vtfixup .vtfixup .vtfixup base: 0x00400000 [1] [1] [1] [1] int32 int32 int32 int32 retainappdomain retainappdomain retainappdomain retainappdomain at at at at D_00007000 D_00007004 D_00007028 D_0000702C // // // // 06000001 06000002 06000004 06000018 "fManaged2 called" void [mscorlib]System.Console::WriteLine(string)

The next three sections break down each of these steps, and we provide examples to illustrate exactly what you need to do.

Figure 3-8 shows a form-based implementation of the consumer that allows you to receive stock quotes and place trades.

This is the most challenging task in the migration process and requires a good understanding of your application. The good news is that applications using DAOs don t have any impact on the business logic tier of the application, and the migration effort is limited only in the persistence tier. If you followed the DAO design pattern religiously, you most likely created value or transfer objects (similar to DTOs) that are used by the business tier to retrieve or update data from the database. A careful look reveals that these transfer objects resemble entities. A little

analysis is all that is required to understand the relationship between these transfer objects, allowing them to safely be converted to entities. Suppose that ActionBazaar initially used JDBC DAOs for persistence and the transfer object BidTO looked similar to listing 14.6.

public class BidTO implements Serializable { private Timestamp bidDate; Instance fields private Long bidId; private Double bidPrice; private String bidStatus; private ItemTO item; private UserTO bidder; public BidTO() { }

From the comment in the first line, you can conclude that the EXE file is loaded at the address 0x00400000. For the first vtable, the metadata provides a mapping from the relative virtual address (RVA) 0x7000 to metadata token 06000001. The runtime can use this information to generate an unmanaged-to-managed thunk for fManaged. The RVA is relative to the image s base address, 0x00400000. Therefore, the function pointer for the thunk to target function fManaged can be found at the virtual address 0x00407000. To find the thunk to fManaged2, you have to look at the virtual address 0x00407004. The metadata token identifies the managed target function. As described in 4, assemblies store metadata in various metadata tables. For functions, there is a special metadata table. In all metadata tables, rows are identified by a 32-bit value called the metadata

public Timestamp getBidDate() { return bidDate; } public void setBidDate(Timestamp bidDate) { this.bidDate = bidDate; } }