java面向对象高级分层实例_数据库操作类

package bdqn.studentSys.Dao.impl;
/***
 * 学生表的数据库操作类
 */
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import bdqn.studentSys.Dao.BaseDao;
import bdqn.studentSys.Dao.StudentDao;
import bdqn.studentSys.entity.Student;
public class StudentDaoImpl extends BaseDao implements StudentDao {
  
  //查询全部
  public List<Student> getAllStudent() {
    // TODO Auto-generated method stub
    List<Student> studentlist=new ArrayList<Student>();
    String sql="select * from Student";
    try {
      ResultSet rs=executeQurey(sql, null);
      while(rs.next()){
        Student stu=new Student();
        stu.setName(rs.getString(1));
        stu.setPwd(rs.getString(2));
        stu.setAge(rs.getInt(3));
        stu.setSex(rs.getString(4));
        studentlist.add(stu);
      }
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      closeAll();
    }
    return studentlist;
  }
  //修改
  public int UpdateStudent(Student stu) {
    // TODO Auto-generated method stub
    int rel=0;
    String sql="update Student set name=?,pwd=?,age=?,sex=? where stuno=?";
    Object[]prams={stu.getName(),stu.getPwd(),stu.getAge(),stu.getSex(),stu.getStuno()};
    try {
      rel=executeUpdate(sql, prams);
    } catch (SQLException e) {
      e.printStackTrace();
    }finally{
      closeAll();
    }
    return rel;
  }
  //添加
  public int addStudent(Student stu) {
    int rel=0;
    String sql="insert Student (name,pwd,age,sex) values(?,?,?,?)";
    Object []prams={stu.getName(),stu.getPwd(),stu.getAge(),stu.getSex()};
    try {
      rel=executeUpdate(sql, prams);
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      closeAll();
    }
    
    return rel;
  }
  //删除
  public int delStudent(int stuno) {
    int rel=0;
    String sql="delete from Student where studentno=?";
    Object[]prams={stuno};
    try {
      rel=executeUpdate(sql, prams);
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }finally{
      closeAll();
    }
    return rel;
  }
}