使用Java实现数据库编程-----------查询学生记录

查询所有学生记录，包含年级名称

@Override
public LIst<Student>getAllStudent() throws Exception{
	List<Student> list=new ArrayList<Student>();
	String sql="SELECT * FROM Student,Grade WHERE Student.GradeId=Grade.GradeId AND GradeName=?"
	ResultSet rs = executeQuery(sql,gradeName);
	if(rs!=null){
		while(rs.next()){
			//获取学生值
			Student student=new Student();
			student.setGradeId(rs.getInt("gradeId"));
			student.setStudentName(rs.getString("StudentName"));
			student.setStudentNo(rs.getInt("studentNo"));
			//获取的就是当前学生的年级信息
			Grade grade=new Grade();
			grade.setGradeName(rs.getString("gradeName"));
			student.setGrade(grade);
 
			list.add(student);
		}
	}
	closeResource();
	return list;
}

　查询S1年级下的学生记录

@Override
public LIst<Users>getUsersbyAddress(Student address) throws Exception{
	LIst<Users> list=new ArrayList<Users>();
	//准备SQL
	String sql="select * from users where user_name like ?";
	ResultSet rs = executeQuery(sql,"%"+address+"%");
	if(rs!=null){
		while(rs.next()){
			//创建User对象保存每一条数据的值
			Users users=new Users();
			users.setUser_id(rs.getInt("user_id"));
			Users.setUser_name(rs.getString("user_name"));
			users.setUser_code(rs.getString("user_code"));
			Users.setUser_password(rs.getString("user_password"));
		}
	}
	//关闭资源
	closeResource();
	return list;
}