jdbc一篇小记录

//实体类不仔细描述了
public User{
private int id;

private String name;
...
...
}

//dbhelp类，封装数据库连接
public DBHelp{
public static String url = "jdbc:mysql://localhost:3306/blog";
public static String user = "root";
public static String password = "";
public static String driver = "com.mysql.jdbc.Driver";
public static PreparedStatement ps = null;
public static Connection conn = null;
//获取连接

public static void getConnection(){
try{
Class.forName(driver);
conn = DriverManager.getConnection(url,user,password);
}catch(SQLException e)  {
e.printStackTrace();
}
}
//关闭连接
public void close(){
try{
ps.close();
conn.close();
}catch (SQLException e) {
e.printStackTrace();
}
}
}

----------
//操作数据类
public UserDemoCurrd extends DBHelp{

public ResultSet rs = null;
//查找一个用户数据
public user getUser(){
//获取连接方法
getConnection();
User user = new User();
try{
String sql = "select * from t_sys_user where id = 1";
conn = ps.prepareStatement(sql);
rs = ps.executeQuery();
while (rs.next()){
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setContact(rs.getString("contact"));
user.setEmail(rs.getString("email"));
user.setRemark(rs.getString("remark"));
user.setTelephone(rs.getString("telephone"));
}
}catch (SQLException e) {
e.printStackTrace();
}
close();
return user;
}
}

//测试类
public UserTest{
public static void main(String[] a){
UserDemoCurrd demo = new UserDemoCurrd();
demo.getUser();
System.out.println(user.getName);
}
}