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where version is the driver version, and format is the JDBC type At the time of this writing, the latest PostgreSQL JDBC driver version is 81-407 Thus, the JDBC driver to use for the J2SE 50 SDK is postgresql-81-407jdbc3jar Note that the version available on the PostgreSQL JDBC web site is often newer than the JDBC drivers supplied in the PostgreSQL server installation package You can still use the version supplied with your server installation package, but there may be bugs that have been fixed in the later releases The PostgreSQL JDBC drivers are created as a Java jar file A jar file is a collection of Java classes that are grouped together into a single Java namespace and can be referenced by Java applications Because the classes in the jar file are called directly by Java applications, the jar file must be present when the application executes, and the application must know where to find it Because of this, you must distribute the appropriate PostgreSQL JDBC jar file with your PostgreSQL Java application (or require your customers to download the PostgreSQL JDBC driver themselves) The following sections describe how to include the JDBC driver file in your application
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The NetBeans IDE creates a single jar file that contains the application class files contained in a project This jar file should be distributed as your application and run directly in the Java JVM When you build your application, NetBeans provides the
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created jar file information, showing you the Java command to use to execute the application The NetBeans IDE also allows you to include library files within the project The library files can include any jar files required for the application to run When your project is opened in the IDE, the Projects tab in the left window lists the files associated with the project The Libraries section should include any jar files that are required by the application By default, the Libraries section includes just the standard JDK 15 libraries To include the PostgreSQL JDBC driver file, right-click the Libraries heading and select Add JAR/folder From the window, select the appropriate PostgreSQL JDBC driver file required for your Java environment, either from the PostgreSQL jdbc folder or from the download from the jdbcpostgresqlorg web site Adding the PostgreSQL JDBC driver file to the project library creates a copy of the driver file in the project s lib folder If you distribute the application s jar files to customers, the lib folder (and the PostgreSQL JDBC driver in it) is automatically included in the application jar file You do not need to include a separate copy of the PostgreSQL JDBC driver with your application
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Running a Java application from the command line requires that you manually reference the PostgreSQL JDBC driver file The Java command-line runtime engine (java) references directories and libraries that contain Java classes using the CLASSPATH variable This means that you not only must reference any directories that contain your Java application files, but must also directly reference any jar library files in the CLASSPATH There are two ways to do this The first way is to define the Windows CLASSPATH environment variable that references the required directories and libraries:
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C:\javatest> SET CLASSPATH=C:\javatest\ C:\javatest> java JavaTest Hello World! C:\javatest>
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The Java runtime engine uses the CLASSPATH environment variable to find the JavaTestclass class file necessary to run the application If the application requires a jar file (such as the PostgreSQL driver file), you must specifically add it to the CLASSPATH variable, even if it is in a directory already referenced:
SET CLASSPATH=C:\javatest;C:\javatest\postgresql-81-405jdbc3jar
The downside to using this method is that if you have multiple Java applications on your system, you would have to either place them all into the same directory or add each application s directory and libraries to the CLASSPATH environment variable
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