import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCException {   
    static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://127.0.0.1:3306/mldn";//Ĭ��3306
    static final String USER = "root";
    static final String PASS = "123456";
    public static void main(String[] args) {
        Connection conn = null;
        try {           
            Class.forName(JDBC_DRIVER);
            System.out.println("Connecting to database...");
            conn = DriverManager.getConnection(DB_URL, USER, PASS);
            System.out.println("Creating statement...");
            Statement stmt = conn.createStatement();
            String sql = "SELECT * FROM emp";
            ResultSet rs = stmt.executeQuery(sql);//���������executeUpdate

            while (rs.next()) {
                int empno = rs.getInt("empno");//����д1��д��empno�����ݿⶨ��Ľṹȡ
                String ename = rs.getString("ename");
                String job = rs.getString("job");
                System.out.print("empno: " + empno);
                System.out.print(", ename: " + ename);
                System.out.println(", job: " + job);//����� �ٻ���
            }     
            rs.close();//�������ջ��ƣ����Լ��ز��˷�
            stmt.close();
            conn.close();//����أ�һ�����ݿ����ӡ�����
        } catch (SQLException se) {//����쳣˳���ܻ�
              se.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
        	try {
                if (conn != null)   conn.close();//��Ȼ����ʲô��
            } catch (SQLException se) {
                se.printStackTrace();
            } 
        }        
    }
}
 

一是要導包（驅動檔案）
2是安裝了MYSQL資料庫並且匯入了資料表；