Question

I want simple test for JDBC connection, I don’t use framework, only JDBC and JUnit. Can I perform this test with JUnit? I have no idea how to even test loading driver, please give me some example of connection test.

Connection client:

package newpackage.db;

import java.sql.Connection;
import java.util.logging.Level;
import java.util.logging.Logger;

public class SqlConnection {
    private Connection con;
    private String name;
    private String url;
    private String password;
    private String driver;

    public SqlConnection() {
        this.name = "root";
        this.password = "12345";
        this.url = "";
        this.driver = "com.mysql.jdbc.Driver";
    }

    public Connection getConnection() {
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(SqlConnection.class.getName()).log(Level.SEVERE, null, ex);
        }

        return null;
    }
}

Test case:

public void testDriverManager() {
    SqlConnection conClient = new SqlConnection();
    assertEquals(conClient.getConnection(),...);
    or
    assertTrue(conClient.getConnection(),...);
}

Answer 1

Basically, you can follow this guide for the drivermanager in order to establish a connection.

http://docs.oracle.com/javase/tutorial/jdbc/basics/connecting.html

The best test for a connection is reading some basic stuff from your database. E.g. select 1 from dual

Be aware that this test requires a running database! Keep the amount of these integrative tests low, as they do not scale well and require a certain environment given. It makes continuous integration on e.g. Hudson kind of more difficult, as you will have to install a database on all continuous integration server nodes and keep it running.