JDBC连接实例

 package com.javaee.corejava;

 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;

 public class JDBCConnect {

     public JDBCConnect() {
         // TODO Auto-generated constructor stub
     }

     public static void main(String[] args) {
         try {
             //加载mysql的JDBC驱动
             Class.forName("com.mysql.jdbc.Driver");
             String url="jdbc://localhost:3306/v3x";
             String userName="root";
             String pwd="123456";
             //获取数据库连接
             Connection con= DriverManager.getConnection(url, userName, pwd);
             String sql="select * from ctp_affair where id=?";
             //Statement stmt=con.createStatement();
             PreparedStatement pstmt=con.prepareStatement(sql);
             pstmt.setLong(1, 0L);
             //执行查询
             ResultSet rs=pstmt.executeQuery();
             while(rs.next()){
                 String subject=rs.getString("subject");
             }
             //关闭连接，释放资源
             rs.close();// 关闭记录集
             pstmt.close();// 关闭声明
             con.close();// 关闭连接对象
         } catch (Exception e) {
             e.printStackTrace();
         }

     }

 }