Java™ Application Development on Linux - Dator

332Chapter 15Accessing the Data: An Introduction to JDBCConnection conn = DriverManager.getConnection(url, username, password);Getting this to compile and run requires you to have the appropriateJDBC JAR files available. For Oracle, see your Oracle DBA, or see pages228–229 of Java Oracle Database <strong>Development</strong> by David Gallardo. For MySQL,it’s an easy download you can install from the Internet.15.3.1 Downloading JDBC for MySQLThe JDBC implementation for MySQL is available for free fromhttp://www.mysql.com/downloads/api-jdbc.html.The current version at the time of writing was mysql-connector-java-3.0.9-stable.tar.gz which you can unpack as follows:$ gunzip mysql-connector-java-3.0.9-stable.tar.gz$ tar xvf mysql-connector-java-3.0.9-stable.tarThat leaves you with a directory named mysql-connector-java-3.0.9-stable which contains a JAR file named mysql-connector-java-3.0.9-stable-bin.jar along with some directories (which are the contentsof the JAR, unpacked) and a few miscellaneous files.From the readme file:Once you have unarchived the distribution archive, you can install thedriver in one of two ways:• Either copy the com and org subdirectories and all of their contentsto anywhere you like, and put the directory holding the com and orgsubdirectories in your classpath, or• Put mysql-connector-java-3.0.9-stable-bin.jar in your classpath,either by adding the full path to it to your CLASSPATHenvironment variable, or putting it in $JAVA_HOME/jre/lib/ext.Unlike JUnit, it is OK to put this JAR in the ext directory.15.4QUERYING DATABack to our example. Do you remember the portion that built the query? Hereit is again: