Question

I ve installed MySQL (last update).
I need to code, that ll create & establish a connection with SQL DB
& manage the DB(using SELECT, INSERT, CREATE).

I did everything but, I am not able to create connection. I’ve also installed the MySQL/J connector, I just extracted the .zip pack in a folder & added the folder path in Variables).

Can anyone tell me wat is meant by URL in the below line?

Connection connection = DriverManager.getConnection(url, username, password);

I ve tried this:

String url = "jdbc:odbc:sqlserver://localhost:3306/myfirstdb";
Connection con = DriverManager.getConnection(url, "root", "1234");

But it’s not working. I am unable able to understand the term ‘URL’.
Can anyone explain, the meaning of ‘url’ and wat should be done to connect to a SQL server from Java.

---

Update:

This is the Full code. It still cannot connect.

import java.sql.*;

public class TestDriver {

public static void main(String[] args) {
try {
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");//This s wat actually i did for connection
    System.out.println("Driver Loaded Succesfully");
}
catch (Exception e){
    System.out.println("Unable to Load Driver!!!");
}

try {
    Class.forName(com.mysql.jdbc.Driver");  // initialise the driver
    String url ="jdbc:mysql://localhost:3306/myfirstdb";
    Connection con = DriverManager.getConnection(url, "root", "1234");
    System.out.println("connection Established");
    }
    catch(Exception e) {
                System.out.println("Couldnt get connection");
    }
    }
}

Can you tell me wat is the purpose of MySQL Connector/J?

Answer 1

In the question you seem to be using a MySQL jdbc driver with a SQL Server jdbc URL. This won’t work.

If you are using a MySQL database:

Class.forName("com.mysql.jdbc.Driver");  // initialise the driver

String url ="jdbc:mysql://localhost:3306/myfirstdb";

If you are using a SQL Server database you are going to need a completely different jdbc driver. jTDS is open source and a good option. Include the jtds.jar file in your classpath and use something like:

Class.forName("net.sourceforge.jtds.jdbc.Driver");  // initialise the driver

String url = "jdbc:jtds:sqlserver://localhost:1433/myfirstdb";