淺談對(duì)于DAO設(shè)計(jì)模式的理解

public interface Manage {
  /*插入(insert)操作--->方法名(插入的數(shù)據(jù)1，插入的數(shù)據(jù)2，……)-->返回T|F*/
  public boolean insert(String name,String classes,String score);
  /*獲取全表(select *)操作-->利用Bean，一行對(duì)應(yīng)一個(gè)Bean-->返回一個(gè)承載Bean的Collection*/
  public Collection select();
  /*刪除(delete)操作-->方法名(where處需要的數(shù)據(jù))--->返回T|F*/
  public boolean delete(String id);
  /*獲取指定行對(duì)象---->方法名（where處需要的數(shù)據(jù)）---->返回一個(gè)承載Bean的List*/
  public List up_select(String id);
  /*修改指定行對(duì)象---->方法名(修改數(shù)據(jù)1，修改數(shù)據(jù)2，……，where處需要的數(shù)據(jù))---->返回T|F*/
  public boolean update(String name,String classes,String id);
}

public class ManageInfo implements Manage {
  final private String url="jdbc:mysql://localhost:3306/bean";
  final private String user="root";
  final private String password="root";
  @Override
  public boolean insert(String name, String classes, String score) throws Exception {
    Class.forName("com.mysql.jdbc.Driver");
    Connection conn = DriverManager.getConnection(url, user, password);
    String sql="insert into test(name,classes,score) Values(?,?,?)";
    PreparedStatement st=conn.prepareStatement(sql);
    st.setString(1,name);
    st.setString(2,classes);
    st.setString(3,score);
    int count=st.executeUpdate();
    if(count<=1){
      return true;
    }else {
      return false;
    }
  }