How to get realative path for database?

问题

I am developing a jframe to store some data in database by using textfields and all. i have following code for database connection. I am using sqlite database.

**Connectdatabase.java**

    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package shreesai;

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    import javax.swing.JOptionPane;

    /**
     *
     * @author DeepRocks
     */
    public class Connectdatabase {

        Connection con = null;

        public static Connection ConnecrDb(){

            try{
                Class.forName("org.sqlite.JDBC");
                Connection con = DriverManager.getConnection("jdbc:sqlite:G:\\Development\\Project\\database\\shreesai.sqlite");
                return con;
            }
            catch(ClassNotFoundException | SQLException e){
                JOptionPane.showMessageDialog(null,"Problem with connection of database");
                return null;
            }
        }
}****

/* ALL IS WORKING FINE WITH THIS BUT I WANT THAT IS IF I EXPORT THIS PROJECT TO JAR AND MY CLIENT WILL RUN JAR FROM DIFFERENT PATH THEN????*/

I've tried using this code

public class Connectdatabase {

    Connection con = null;

    public static Connection ConnecrDb(){

        try{
            String dir = System.getProperty("user.dir");
            Class.forName("org.sqlite.JDBC");
            Connection con = DriverManager.getConnection("jdbc:sqlite:"+dir+"shreesai.sqlite");
            return con;
        }
        catch(ClassNotFoundException | SQLException e){
            JOptionPane.showMessageDialog(null,"Problem with connection of database");
            return null;
        }
    }

}

Even i tried this one :

public class Connectdatabase {

        Connection con = null;

        public static Connection ConnecrDb(){

            try{
                String dir = System.getProperty("user.dir");
                String maindir = dir + File.separator + File.separator ;
                Class.forName("org.sqlite.JDBC");
                Connection con = DriverManager.getConnection("jdbc:sqlite:"+maindir+"shreesai.sqlite");
                return con;
            }
            catch(ClassNotFoundException | SQLException e){
                JOptionPane.showMessageDialog(null,"Problem with connection of database");
                return null;
            }
        }

    }

But NOTHING i think there must be problem with that double backslashes cause dir returning : G:\Development\Project\database. and we want G:\\Development\\Project\\database\\

Any help?

回答1:

The ways you're tried are not wrong, but it's right only on your computer, so, the solution is easy, bring the .sqlite file inside the src, maybe you want create a package named Database, it's not required, but it's better.

IF the .sqlite file was inside the source would be like that:

src/shreesai.sqlite

....=DriverManager.getConnection("jdbc:sqlite:src/shreesai.sqlite");

Don't want the absolute path too, and avoid using backslashes with directories( \\ ) because of different windowing platforms, use slash(/) instead.

来源：https://stackoverflow.com/questions/17978152/how-to-get-realative-path-for-database

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java

sql

swing

path