Developing Oracle Application with Java

Oracle provides us with three java methodologies to develop applications in the database; Java stored procedures, Enterprise JavaBeans EJB, and Common Object Request Broker Architecture CORBA. Java stored procedures work closely with database triggers, functions, and procedures. The Java stored procedures method allows you to move Java applications into the database, execute them with the JVM, and return values to PL/SQL programs. Enterprise JavaBeans is a standard for 100 percent Java distributed applications. To support CORBA, Oracle has an Object Request Broker ORB in the database, allowing Internet Inter-ORB Protocol called IIOP communication with distributed objects in any language, including Java. Java implemented CORBA server and EJB applications require that you use multithreaded / shared server configuration.

Java stored Procedures:

Probably the quickest way to begin using Java in the Oracle database is with Java stored procedures. You can quickly create small Java applications, load them into the database, and call them as you would a PL/SQL procedure. Some note-worthy benefits of Java stored procedures are as follows.

They provide centralized enforcement of business rules.

They are part of the SQLJ standard

The Java language is an alternative and complement of PL/SQL

Write the Java code and load it in the Oracle database.

If you are not already a savvy Java developer, you will need to first understand the difference type of Java files. Java source code files have the .java extension and are simple text files. Java source code is compiled into portable bytecode files that have the extension .class, Java .class, and resource files can be compressed and combined into archive files, which end with the .jar extension. You can load the following types of Java files into the Oracle database.

1. Source code and then compile it using the database bytecode compiler.
2. Compiled code like .class or .jar files.
3. Resource files, such as images.

You can use two methods to load Java files into the Oracle database. One method is to run the Oracle loadjava utility from the command line. Because loadjava simplifies the process, we will refer to it in the following sections. The other method is to execute the Create Java DDL statement from SQL*Plus. This requires the following steps.

• Write the code, using your favorite text editor or Integrated Development Environment IDE.
• Load the code into a BLOB or LOB with the created java statement.
• Manually resolve any external reference.

 

How to load object using Loadjava, this we can learn from our next session. Want more Oracle DBA tutorials? Check our professional online Oracle DBA courses. Dbametrix is leading database dba company to providing database support to global clients with all aspects and requirement of client to manage small to large databases with strong service level agreement and response time.

About Oracle Certification

There are lots of Oracle certification courses and institutes available in market. Specially, when we are talking about online Oracle courses then lots of online training offers available in different websites. Most of online Oracle course structure are made by non-Oracle techies or non-technical persons. Therefore, you never get good knowledge and depth knowledge of Oracle DBA during these type of online courses. Even you would not able to crack your technical job interview too using this kind of online training.

When you are going to select online Oracle tutorial courses then you should need to keep in mind following points for better performance and advantages.

1. Online Training should be made by high expert Oracle certified DBA who has goog experience and able to provide nice demostration of each toughest Oracle processes in very easy technique like animation.

2. Good support of company during online training course and after finishing online training course.

3. Most of the online institute provides certification with some unique identification. You should need to check either this type of certification is available or not.

4. Live instructor facility available or not. Using this facility you can get better learning and depth of knowledge of your full online Oracle courses like classroom training.

5. How they resolve your queries during online training? Ask this question to online training provider. Good online training provider company provides some platform like helpdesk or conducting chat with instructor for clearing your doubts.

6. Online Oracle courses must be conducted using e-learning platform. Without e-learning platform, there is no online course is effective because it doesn't contain all modules of trainings like images, animination, live videos, pdf, questions-answers, study materials, etc. Only video is not necessary, otherwise there is difference between computer based training and online training.

These all points are needing to keep in mind for taking online Oracle courses. Most of good online Oracle Course provider offer these all facility. You can clear your doubts using good Oracle DBA forums. You can get more knownledge using excellent Oracle Support and Database Services blogs. Some good reputed DBA services provider company also provides good resources for learning and job facility.