Activity 3: Run a JDBC program using the embedded driver This activity loads the database engine using a simple Java JDBC program. WwdEmbedded.java programrunning CLASSPATH environment variable This activity assumes that you have opened a command window and navigated to the DERBYTUTOR directory. JDBC is the Java Database Connectivity API and is also the native API for . The program uses the embedded driver to create the jdbcDemoDB database (if the database does not exist) and then connect to the database. You can then populate a table within the database with text. The program demonstrates some basic JDBC processing along with related error handling.

The Java compiler and runtime use the classpath, specified by the CLASSPATH environment variable, to locate the binary files (jar files and class files) that are needed to run and other Java applications. Before performing this activity, you need to set the classpath and compile the WwdEmbedded.java program.

 Copy the program files into the DERBYTUTOR directory and set the CLASSPATH environment variable, as shown in the following table. Commands to copy the program files and set the <codeph>CLASSPATH</codeph> environment variableThis table lists the commands to copy the program files into the DERBYTUTOR directory and set the CLASSPATH environment variable on UNIX and Windows systems. Operating System Command UNIX (Korn Shell) cp $DERBY_HOME/demo/programs/workingwithderby/* . export CLASSPATH=$DERBY_HOME/lib/derby.jar:$DERBY_HOME/lib/derbyshared.jar:. Windows copy %DERBY_HOME%\demo\programs\workingwithderby\* . set CLASSPATH=%DERBY_HOME%\lib\derby.jar;%DERBY_HOME%\lib\derbyshared.jar;.
Include the dot (.) at the end of each command so that your current working directory is included in the classpath and the files are copied to the correct location. Compile the program source files. The sample program is contained in two source files: WwdEmbedded.java and WwdUtils.java. Issue the following command to compile both at the same time: javac WwdEmbedded.java WwdUtils.java A command prompt appears if the compilation is successful. The binary files WwdEmbedded.class and WwdUtils.class are created. If an error message appears, verify that the JDK is properly installed. Run the program.The WwdEmbedded.java program populates a table with wish-list items. The program prompts you for text input (up to 32 characters), stores the text input in a database table, and then lists the items stored in the table. The program continues to ask for wish-list items until the you type the command exit or a problem is encountered. Some basic information on program progress is displayed at the beginning and the end of the program. java WwdEmbedded org.apache.derby.jdbc.EmbeddedDriver loaded. Connected to database jdbcDemoDB . . . . creating table WISH_LIST Enter wish-list item (enter exit to end): a peppermint stick __________________________________________________ On 2012-09-14 09:46:37.77 I wished for a peppermint stick __________________________________________________ Enter wish-list item (enter exit to end): a long vacation __________________________________________________ On 2012-09-14 09:46:37.77 I wished for a peppermint stick On 2012-09-14 09:46:51.654 I wished for a long vacation __________________________________________________ Enter wish-list item (enter exit to end): exit Closed connection Database shut down normally Getting Started With Derby JDBC program ending.