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he Java programming language has quickly become the favorite of programmers who must create applications for multiple platforms A Java application can run on Windows, Unix, and Linux operating system platforms without having to recompile new executables Because of this feature, many programmers are learning Java and converting their applications to the Java environment PostgreSQL supports the Java programming environment by providing a driver for the Java Database Connectivity (JDBC) programming interface This chapter describes the Java development environment, JDBC, and how to use the PostgreSQL JDBC driver to create Java applications that can access data on a PostgreSQL server
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The Java programming language has become a popular tool for developers who need to make applications work in environments that support multiple operating system platforms Instead of having to have multiple versions of an application for each operating system platform, Java programs can be created and compiled on one platform, and then run on a totally different platform with (usually) no modifications or problems While the Java technology is relatively new to the programming world, it has already matured into a full-blown programming environment There are three types of Java programming platforms to choose from: J2SE Java version 2 Standard Edition, for developing workstation and server applications J2EE Java version 2 Enterprise Edition, for developing server-side web applications J2ME Java version 2 Micro Edition, for developing mobile device applications
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The Java Runtime Edition (JRE) package is not a development platform, but must be loaded on a system for Java applications to execute It provides the Java Virtual Machine (JVM) core libraries required for Java applications (both desktop and web based) to execute There are different versions of the JRE for each operating system platform Once a Java application is compiled, it can run on any JVM on any operating system platform without having to be recompiled for the operating system You cannot develop new applications with just the JRE, though To develop Java applications, you must have the J2SE, J2EE, or J2ME environment installed All three of these environments include the Java compiler for creating Java applications, along with the standard Java library files for their specific programming environments All of these development environments support JDBC for connecting to database servers JDBC is the Java layer that allows Java applications to connect and interact with databases JDBC is a standard interface for all Java applications Database vendors must supply a compatible JDBC library file for Java applications to interface with their individual database products Java programmers can write code that interfaces with JDBC
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PostgreSQL database
Java application program
MySQL JDBC driver
MySQL database
MS SQL server JDBC driver
MS SQL server database
Figure 15-1 The Java JDBC environment
This code can then be used to access any database that provides a JDBC driver This is demonstrated in Figure 15-1 After connecting to the database using JDBC, the Java application can access tables and data using standard JDBC methods and properties These methods and properties remain consistent for all databases using the JDBC driver To develop Java applications for PostgreSQL, you must have a Java development environment and the PostgreSQL JDBC driver The following sections describe how to download and install a Java development environment to start your Java programming Following that, the PostgreSQL JDBC driver is discussed
Downloading the Java SDK
As mentioned in the previous section, there are three different Java development environments available Which development environment you should select depends on the type of applications you need to develop If you are creating standard desktop applications for workstations, you need the J2SE Software Developer Kit (SDK) This package allows you to create both command-line and GUI applications that can run on any operating system workstation or server If you are creating web-based applications, you need the J2EE SDK This package allows you to create both command-line and GUI applications like the J2SE, but also provides a development environment for creating Java beans and web services Java beans are small routines that are called by web applications to perform specific functions or tasks These features are used in web servers to provide an application interface that allows clients to use standard web browsers to run applications
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