JDBC - Select Database Example

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This chapter provides an example on how to select a Database using JDBC application. Before executing the following example, make sure you have the following in place −

• To execute the following example you need to replace the username and password with your actual user name and password.

• Your MySQL or whatever database you are using, is up and running.

Required Steps

The following steps are required to create a new Database using JDBC application −

• Import the packages − Requires that you include the packages containing the JDBC classes needed for the database programming. Most often, using import java.sql.* will suffice.

• Open a connection − Requires using the DriverManager.getConnection() method to create a Connection object, which represents a physical connection with a selected database.

  Selection of database is made while you prepare database URL. Following example would make connection with STUDENTS database.

• Clean up the environment − try with resources automatically closes the resources.

Sample Code

Copy and paste the following example in JDBCExample.java, compile and run as follows −

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCExample {
   static final String DB_URL = "jdbc:mysql://localhost/TUTORIALSPOINT";
   static final String USER = "guest";
   static final String PASS = "guest123";

   public static void main(String[] args) {
      System.out.println("Connecting to a selected database...");
      // Open a connection
      try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);) {		      
         System.out.println("Connected database successfully...");  
      } catch (SQLException e) {
         e.printStackTrace();
      } 
   }
}

Now let us compile the above example as follows −

C:\>javac JDBCExample.java
C:\>

When you run JDBCExample, it produces the following result −

C:\>java JDBCExample
Connecting to a selected database...
Connected database successfully...
C:\>