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- 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;
- Statement stmt = 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...");
- //STEP 4: Execute a query
- System.out.println("Creating statement...");
- stmt = conn.createStatement();
- String sql = "SELECT id, first, last, age FROM Registration";
- ResultSet rs = stmt.executeQuery(sql);
- //STEP 5: Extract data from result set
- while(rs.next()){
- //Retrieve by column name
- int id = rs.getInt("id");
- int age = rs.getInt("age");
- String first = rs.getString("first");
- String last = rs.getString("last");
- //Display values
- System.out.print("ID: " + id);
- System.out.print(", Age: " + age);
- System.out.print(", First: " + first);
- System.out.println(", Last: " + last);
- }
- rs.close();
- }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(stmt!=null)
- conn.close();
- }catch(SQLException se){
- }// do nothing
- try{
- if(conn!=null)
- conn.close();
- }catch(SQLException se){
- se.printStackTrace();
- }//end finally try
- }//end try
- System.out.println("Goodbye!");
- }//end main
- }//end JDBCExample
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