Download Core Java Data Objects by Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko PDF

By Sameer Tyagi, Michael Vorburger, Keiron McCammon, Heiko Bobzin

The necessity for endurance is a prerequisite for any firm program and the case isn't any diversified for purposes written within the Java programming language. a regular Java program will encompass code that's chargeable for storing and retrieving the applying particular info to a couple type of garage facility in order that it may be retrieved and used at a later time. Now there's a new alternative-Java information gadgets (JDO) that's good put to alter the best way builders have ordinarily perceived endurance of their purposes. JDO is a customary built lower than the auspices of the Java neighborhood approach via a couple of contributors. JDO is a brand new know-how, however it is one who holds nice promise. while you are an architect, a developer or perhaps a supervisor that's concerned with patience in Java and wish to achieve an perception into this expertise then this booklet is for you.

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Vendor supplied tools would be used to generate source code adhering to the persistence capable contract, which would then be compiled as normal. The drawback of this approach is that it won’t work for existing classes and won’t appeal to those who like to write their own code. 2. Source code pre-processing This is where existing source code is pre-processed and updated. This approach works well if the source code for a class is available. Chapter Draft. For review purposes only. Content subject to change 4 Chapter 3 Vendor supplied tools would be used to read the original source code and update it to adhere to the persistence capable contract which would then be compiled as normal.

4 CONNECTING TO A DATASTORE Once a persistence capable class has been defined the next step is to implement an application that actually uses it. Any JDO application needs to initially get a connection to the underlying datastore before it can do anything. This is done by configuring an instance of PersistenceManagerFactory and then using it to get a PersistenceManager. PersistenceManagerFactory is just a Java interface; JDO does not really mandate how to create an actual PersistenceManagerFactory instance.

For pessimistic locking, the “... FOR UPDATE” SQL syntax (non-standard) may have to be used. Such underlying locking implementations have to be implemented transparent to the application logic and translated to the respective API. 4. util) Collection library have various ways of modeling associations between objects, from simple Arrays, to Sets, to Lists and finally Maps. Different data stores have different and sometimes limited direct support for such models. Relational data stores for example out-of-the-box (with the ubiquitous “join table in the middle”) really model only what a correct Java model would express as a Set, while in XML-to-object mapping speaking a collection of objects is always ordered, thus what Java would model with a List type.

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