This tutorial provides an example on how to select a Database using
JDBC application. Before executing following example, make sure you have
the following in place:
- To execute the following example you need to replace username and password with your actual user name and password.
- Your MySQL or whatever database you are using is up and running.
Required Steps:
There are following steps required to create a new Database using JDBC application:- Import the packages . Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice.
- Register the JDBC driver . Requires that you initialize a driver so you can open a communications channel with the database.
- 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 . Requires explicitly closing all database resources versus relying on the JVM's garbage collection.
Sample Code:
Copy and past following example in JDBCExample.java, compile and run as follows://STEP 1. Import required packages
import java.sql.*;
public class JDBCExample {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost/STUDENTS";
// Database credentials
static final String USER = "username";
static final String PASS = "password";
public static void main(String[] args) {
Connection conn = null;
try{
//STEP 2: Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
//STEP 3: Open a connection
System.out.println("Connecting to a selected database...");
conn = DriverManager.getConnection(DB_URL, USER, PASS);
System.out.println("Connected database successfully...");
}catch(SQLException se){
//Handle errors for JDBC
se.printStackTrace();
}catch(Exception e){
//Handle errors for Class.forName
e.printStackTrace();
}finally{
//finally block used to close resources
try{
if(conn!=null)
conn.close();
}catch(SQLException se){
se.printStackTrace();
}//end finally try
}//end try
System.out.println("Goodbye!");
}//end main
}//end JDBCExample
Now let us compile above example as follows:C:\>javac JDBCExample.java
C:\>
When you run JDBCExample, it produces following result:C:\>java JDBCExample
Connecting to a selected database...
Connected database successfully...
Goodbye!
C:\>
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