数据库实体类对应daoimpl，基础的增删改查。

数据库表名student,daoimpl类实现增删改查。

public class StudentDaoImpl extends BaseDao implements StudentDao {
	/**
	 * 查询全部学生信息
	 */
	@Override
	public List<Student> selectAll() {

		List<Student> list = new ArrayList<>();
		// 获取basedao里面通用的返回结果集
		String sql = "select * from student";
		Object[] params = {};
		ResultSet resultSet = commonExecuteQuery(sql, params);
		// 将rs结果转换成list集合
		try {
			while (resultSet.next()) {
				Student student = new Student();
				student.setStudentNo(resultSet.getInt("studentNo"));
				student.setLoginPsd(resultSet.getString("loginPwd"));
				student.setStudentName(resultSet.getString("studentName"));
				student.setSex(resultSet.getString("sex"));
				student.setGradeId(resultSet.getInt("gradeId"));
				student.setPhone(resultSet.getString("phone"));
				student.setAddress(resultSet.getString("address"));
				student.setBornDate(resultSet.getString("bornDate"));
				student.setEmail(resultSet.getString("email"));
				student.setIdentityCard(resultSet.getString("identityCard"));
				// 添加到list集合
				list.add(student);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

		return list;
	}

	@Override
	public Student selectOne(String studentNo) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int insertStudent(Student student) {

		int row = 0;
		String sql = "insert into student "
				+ "(studentNo,loginPwd,studentName,sex,gradeId,phone,address,bornDate,email,identityCard) "
				+ "values(?,?,?,?,?,?,?,?,?,?)";

		// 占位符参数
		Object[] params = { student.getStudentNo(), student.getLoginPsd(), student.getStudentName(), student.getSex(),
				student.getGradeId(), student.getPhone(), student.getAddress(), student.getBornDate(),
				student.getEmail(), student.getIdentityCard() };

		row = commonExecuteUpdate(sql, params);

		return row;
	}

	@Override
	public int updateStudent(Student student) {
		int row = 0;
		String sql = "update student set loginPwd=?,studentName=?,sex=?,gradeId=?,phone=?,address=?,bornDate=?,email=?,identityCard=?"
				+ "where studentNo=?";

		// 占位符参数
		Object[] params = { student.getLoginPsd(), student.getStudentName(), student.getSex(), student.getGradeId(),
				student.getPhone(), student.getAddress(), student.getBornDate(), student.getEmail(),
				student.getIdentityCard(), student.getStudentNo() };

		row = commonExecuteUpdate(sql, params);

		return row;
	}

	@Override
	public int deleteStudent(int studentNo) {
		int row = 0;

		String sql = "delete from student where studentNo =?";
		Object[] params = { studentNo };

		row = commonExecuteUpdate(sql, params);

		return row;
	}

	@Override
	public int deleteStudentByGradeId(int gradeId) {
		int row = 0;

		String sql = "delete from student where gradeid =?";
		Object[] params = { gradeId };

		row = commonExecuteUpdate(sql, params);

		return row;
	}

	@Override
	public int deleteGradeByGradeId(int gradeId) {
		int row = 0;

		String sql = "delete from grade where gradeid =?";
		Object[] params = { gradeId };

		row = commonExecuteUpdate(sql, params);

		return row;
	}

}