如何将 PostgreSQL 驱动程序 jar 文件放在 eclipse 的类路径上？

Question

While trying out JDBC program to connect to PostgreSQL database using eclipse it flagged an error saying

java.sql.SQLException: No suitable driver found

It was suggested to place the PostgreSQL driver jar file on the class path. Now my question is, how to place the file on the classpath?.

I am new to eclipse so it would be better for a detailed explanation.

Answer 1

I hope u are in need of the way to buidpath.

Right click on the lib folder and select buildpath option >import jars>  ok  

If this doesnt help u then try copy pasting it mannually under the desired folder hopefully under lib folder.

Answer 2

You'll need the postgresql driver .jar file in the classpath of your program. and check the url is correct is the below example

 try{

            Class.forName("org.postgresql.Driver"); 

       }

       catch(ClassNotFoundException e)
       {
          system.out.println("error class not found exception");
          e.printStackTrace();

       }

       try{
           String URL = "jdbc:postgresql://localhost:5432/your DataBase Name";
           String USER = "postgres";
           String PASS = "postgres";
           Connection conn = DriverManager.getConnection(URL, USER, PASS);
           Statement st = conn.createStatement();
           ResultSet rs = st.executeQuery("Select * from employee");
           while(rs.next()){
               System.out.println(rs.getString(1));
           }

       }

       catch(Exception es){
           es.printStackTrace();
       }

Answer 3

java.sql.SQLException: No suitable driver found is when there is something wrong with your connection-string. Make sure

Class.forName("org.postgresql.Driver");
String url = "jdbc:postgresql://HOST/DATABASE";

are perfectly correct

Answer 4

如果您是 eclipse 中的简单动态 web projetc，则转到 web-inf 并在 lib 文件夹中粘贴 postgre jar。如果您使用的是 maven，只需使用依赖项！

Answer 5

What worked for me was: Right click on project -> Open Module Settings(F4) -> click on the small plus from the right side -> Jar or directories -> Select the path to the driver jar file -> Click on the check next to the new entry in the table -> Make sure the scope is set to compile. This worked out for me, hope it helps someone else too.