Loading the postgreSQL JDBC driver

Question

I am trying to load a JDBC postgreSQL driver for a Java program. I know this is all over the Internet. I have tried many solutions, but none of them have worked for me.

Answer 1

On Linux execute following:

javac -cp '.:postgresql-9.1-901.jdbc4.jar' postgresjavatest.java

java -cp '.:postgresql-9.1-901.jdbc4.jar' postgresjavatest

It will jdbc drivers for you. make sure jar file is on same location

Answer 2

Firstly you need to mention the package names using . instead of / while running the java program:

Go to your classes directory and run JDBCExample as :

java com.freire.test.JDBCExample

But it will now cry for the postgres driver class not found because postgres jar is missing in the classpath.So you need to use the classpath option while running the program and add your postgres jar to the classpath:

for windows:

java -cp .;../lib/postgresql-9.2-1003.jdbc3.jar com.freire.test.JDBCExample

for linux:

java -cp .:../lib/postgresql-9.2-1003.jdbc3.jar com.freire.test.JDBCExample

Answer 3

You need to ensure that the postgresql-9.2-1003.jdbc3.jar is within the class path when you compile and run the program

Try using

javac -cp lib/postgresql-9.2-1003.jdbc3.jar -d classes/ src/com/freire/test/JDBCExample.java

to compile the application and

java -cp lib/postgresql-9.2-1003.jdbc3.jar;./classes com.freire.test.JDBCExample

to run it...

nb As Juned has pointed, technically, you don't need the lib/postgresql-9.2-1003.jdbc3.jar references in the classpath, but consider it an demonstration of how to included compile time dependencies within the complication process ;)