Database Access in Java (JDBC Example)

Accessing and retrieving data from a database is very simple.
First of all you need to add the DB driver(.jar) to your project. After that you can use below code.
In this example I am using mySql database.

//load DB driver

Class.forName("com.mysql.jdbc.Driver");

//this is the connection string

String connString 

   = "jdbc:mysql://localhost:3306/mydb?user=root&password=";  

//Create connection

Connection con = DriverManager.getConnection(connString);

//Create a Statement object using connection

Statement statement = con.createStatement();

//Execute the SQL statement and get the results as a Resultset(Note that the name of the table is 'employee')

ResultSet resultSet = statement.executeQuery("select * from 

           employee");

//Now we can iterate through the resultSet 

while(resultSet.next()){

//following method returns the value in Object type. 

//'name_full' is the column name

  Object o = resultSet.getObject("name_full");

  System.out.println(o);

//following method returns the value in String type.

 String s = resultSet.getString("name_full");

}
//Close the Statement object and Connection object.
statement.close();
con.close();

Note that you can remove above first two lines of the code and replace third line from below line to get the same result.

Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "");