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You only need to know RMI from a very high level for the SCJA exam. However, you will have the opportunity to master RMI through Sun s certification path if you decide to take the Sun Certified Java Developer (SCJD) assignment/exam. The various assignments that are part of the SCJD certification process require that a choice be made between implementation of an RMI or a serialized objects over simple socket connection solution. If you choose RMI for your given assignment, which many candidates do, you ll have the full opportunity to work with RMI. Be aware, though, that you must pass the SCJP exam before signing up for the SCJD. When you finally get to the SCJD exam, you ll want to consider reviewing the following book: SCJD Exam with J2SE 5, Second Edition by Andrew Monkhouse and Terry Camerlengo (Apress, December 2005).
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Exam Objective 6.3 Describe at a high level the benefits and basic characteristics of JDBC, SQL, and RDBMS technologies. Database Management Systems (DBMS) are designed to organize and maintain valuable information. Relational Database Management Systems (RDBMS) provide advanced flexible features that are directly related to their table-based design. The Structured Query Language (SQL) is an industry standard programming language used to work with these relational databases. SQL is supported by the Java Database Connectivity API. The following subsections will acquaint you with everything you ll need to know about database technologies as represented on the exam.
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relational Database Management systems
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A Relational Database Management System (RDBMS) is a type of database management system that organizes its data in the form of interrelated tables. Benefits of an RDMBS include the following:
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n rovides a persistent data store P n rocesses SQL queries P n anages users M n erforms backups and restores P
A list of popular RDBMS programs is shown in Table 10-4. All of these databases can be interfaced via the Structured Query Language.
taBle 10-4
rDBMs program
Java DB MySQL Enterprise Server Oracle Database PostgreSQL Microsoft SQL Server IBM DB2
Web site link
http://developers.sun.com/javadb/ www.mysql.com/products/enterprise/server.html www.oracle.com/database/ www.postgresql.org/ www.microsoft.com/sqlserver/2008/en/us/ www-01.ibm.com/software/data/db2/9/
RDBMS Programs
Working with Database Technologies
structured Query language
The Structured Query Language (SQL), pronounced ess-kew-ell, is a software language designed for retrieval and management of information in RDBMS systems. More specifically, SQL provides the following features:
n perations to support querying/retrieval of information from relational O
databases.
n perations to support modification for example, insertion, updating, and O
deletion of information in relational databases.
n perations to support the management of relational databases. O n perations to support execution plans. An execution plan is generated by the O
RDBMS to specify how it will execute a piece of application code.
n perations to support stored procedures. A stored procedure is a piece of O
application code that is stored and executed within the database. You will get an execution plan as a result of compiling a stored procedure. SQL is an ANSI and ISO standard and has several implementations with comprehensive extensions to the language.
the Java Database Connectivity apI
The Java Database Connectivity (JDBC) API provides for a Java application to connect to an RDBMS server and take advantage of SQL. JDBC allows for the invocation of SQL commands and stored procedures, as well as the processing of such queries. In order to use JDBC, you ll need to import the necessary JDBC packages from the Java SE platform, as well as implement the service provider interface and make use of the RDMBS-specific JDBC driver. Sun maintains a resource of over 200 JDBC drivers via their JDBC Data Access API, allowing you to get JDBC drivers from various vendors. You can access the API at http://developers.sun.com/product/jdbc/drivers.
10:
Understanding Java-Related Platforms and Integration Technologies
For the novice, JDBC and JNDI technologies may be easily confused since both are integration technologies that perform connection and access capabilities. Remember that the JDBC API is used to connect to and interface with databases, while the JNDI API is used to connect to and interface with naming and directory services. You will probably see these technologies in the same group of answers on the exam.
CertIFICatION OBJeCtIVe
Working with additional Java Integration apIs
Exam Objective 6.4 Describe at a high level the benefits and basic characteristics of JNDI, messaging, and JMS technologies. Several Java integration APIs exist. We already discussed RMI and JDBC. Let s now take a look at JNDI and JMS. The JNDI API allows for integration with naming and directory services. The JMS API allows for access to point-to-point and publish/subscribe messaging systems. JNDI and JMS objectives are grouped together under the presumed reason that JMS, as well as other APIs, uses JNDI to interface with necessary resources. These topics will be covered in the following subsections.
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