数据库实验五

登录界面和连接 ：

package com.artisan.dao;

import com.artisan.model.Admin;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class AdminDao extends BaseDao {
	/**
	 * 管理员登陆
	 */
	public Admin login(Admin admin){
		String sql = "select * from s_admin where name=? and password=?";
		Admin adminRst = null;
		try {
			PreparedStatement prst = con.prepareStatement(sql);//把sql语句传给数据库操作对象
			prst.setString(1, admin.getName());
			prst.setString(2, admin.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(executeQuery.next()){
				adminRst = new Admin();
				adminRst.setId(executeQuery.getInt("id"));
				adminRst.setName(executeQuery.getString("name"));
				adminRst.setPassword(executeQuery.getString("password"));
				adminRst.setCreateDate(executeQuery.getString("createDate"));
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return adminRst;
	}
	public String editPassword(Admin admin,String newPassword){
		String sql = "select * from s_admin where id=? and password=?";
		PreparedStatement prst = null;
		int id = 0;
		try {
			prst = con.prepareStatement(sql);
			prst.setInt(1, admin.getId());
			prst.setString(2, admin.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(!executeQuery.next()){
				String retString = "旧密码错误！";
				return retString;
			}
			id = executeQuery.getInt("id");
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}//把sql语句传给数据库操作对象
		String retString = "修改失败";
		String sqlString = "update s_admin set password = ? where id = ?";
		try {
			prst = con.prepareStatement(sqlString);
			prst.setString(1, newPassword);
			prst.setInt(2, id);
			int rst = prst.executeUpdate();
			if(rst > 0){
				retString = "密码修改成功！";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}//把sql语句传给数据库操作对象
		return retString;
	}
}
package com.artisan.dao;

import java.sql.Connection;
import java.sql.SQLException;

import com.artisan.util.DbUtil;

/**
 * 
 * @author llq
 *创建对数据库连接对象，整个项目与数据库打交道都用这一个对象.
 */
public class BaseDao {
	public Connection con = new DbUtil().getCon();
	public void closeDao(){
		try {
			con.close();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

班级信息的代码：

package com.artisan.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.artisan.model.StudentClass;
import com.artisan.util.StringUtil;

/**
 * 
 * 班级信息与数据库的操作
 * @author llq
 *
 */
public class ClassDao extends BaseDao {
	public boolean addClass(StudentClass scl){
		String sql = "insert into s_class values(null,?,?)";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, scl.getName());
			preparedStatement.setString(2, scl.getInfo());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public List getClassList(StudentClass studentClass){
		List retList = new ArrayList();
		String sqlString = "select * from s_class";
		if(!StringUtil.isEmpty(studentClass.getName())){
			sqlString += " where name like '%"+studentClass.getName()+"%'";
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sqlString);
			ResultSet executeQuery = preparedStatement.executeQuery();
			while(executeQuery.next()){
				StudentClass sc = new StudentClass();
				sc.setId(executeQuery.getInt("id"));
				sc.setName(executeQuery.getString("name"));
				sc.setInfo(executeQuery.getString("info"));
				retList.add(sc);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retList;
	}
	public boolean delete(int id){
		String sql = "delete from s_class where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean update(StudentClass sc){
		String sql = "update s_class set name=?, info=? where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, sc.getName());
			preparedStatement.setString(2, sc.getInfo());
			preparedStatement.setInt(3, sc.getId());
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
}

课程信息的操作：

package com.artisan.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.artisan.model.Course;
import com.artisan.util.StringUtil;

/**
 * 
 * @author llq
 *课程信息操作数据库
 */
public class CourseDao extends BaseDao {
	public boolean addCourse(Course course){
		String sql = "insert into s_course values(null,?,?,?,?,0)";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, course.getName());
			preparedStatement.setInt(2, course.getTeacher_id());
			preparedStatement.setInt(3, course.getMax_student_num());
			preparedStatement.setString(4, course.getInfo());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public List getCourseList(Course course){
		List retList = new ArrayList();
		StringBuffer sqlString = new StringBuffer("select * from s_course");
		if(!StringUtil.isEmpty(course.getName())){
			sqlString.append(" and name like '%"+course.getName()+"%'");
		}
		if(course.getTeacher_id() != 0){
			sqlString.append(" and teacher_id ="+course.getTeacher_id());
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sqlString.toString().replaceFirst("and", "where"));
			ResultSet executeQuery = preparedStatement.executeQuery();
			while(executeQuery.next()){
				Course c = new Course();
				c.setId(executeQuery.getInt("id"));
				c.setName(executeQuery.getString("name"));
				c.setTeacher_id(executeQuery.getInt("teacher_id"));
				c.setMax_student_num(executeQuery.getInt("max_student_num"));
				c.setInfo(executeQuery.getString("info"));
				c.setSelected_num(executeQuery.getInt("selected_num"));
				retList.add(c);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retList;
	}
	public boolean delete(int id){
		String sql = "delete from s_course where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean update(Course course){
		String sql = "update s_course set name=?, teacher_id=?,max_student_num=?,info=? where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, course.getName());
			preparedStatement.setInt(2, course.getTeacher_id());
			preparedStatement.setInt(3, course.getMax_student_num());
			preparedStatement.setString(4, course.getInfo());
			preparedStatement.setInt(5, course.getId());
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean selectedEnable(int course_id){
		String sql = "select * from s_course where id=?";
		try {
			PreparedStatement prst = con.prepareStatement(sql);//把sql语句传给数据库操作对象
			prst.setInt(1, course_id);
			ResultSet executeQuery = prst.executeQuery();
			if(executeQuery.next()){
				int max_student_num = executeQuery.getInt("max_student_num");
				int selected_num = executeQuery.getInt("selected_num");
				if(selected_num >= max_student_num)return false;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return true;
	}
	public boolean updateSelectedNum(int course_id,int num){
		String sql = "update s_course set selected_num = selected_num + ? where id = ?";
		if(num < 0){
			sql = "update s_course set selected_num = selected_num - ? where id = ?";
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, 1);
			preparedStatement.setInt(2, course_id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			
		}
		return false;
	}
}

学生选课操作界面：

package com.artisan.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.artisan.model.SelectedCourse;

/**
 * 
 * @author llq
 *选课表操作
 */
public class SelectedCourseDao extends BaseDao {
	public boolean addSelectedCourse(SelectedCourse selectedCourse){
		String sql = "insert into s_selected_course values(null,?,?)";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, selectedCourse.getStudent_id());
			preparedStatement.setInt(2, selectedCourse.getCourse_id());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean updateSelectedCourse(SelectedCourse selectedCourse){
		String sql = "update s_selected_course set student_id = ?,course_id = ? where id = ?";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, selectedCourse.getStudent_id());
			preparedStatement.setInt(2, selectedCourse.getCourse_id());
			preparedStatement.setInt(3, selectedCourse.getId());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public List getSelectedCourseList(SelectedCourse selectedCourse){
		List retList = new ArrayList();
		StringBuffer sqlString = new StringBuffer("select * from s_selected_course");
		if(selectedCourse.getStudent_id() != 0){
			sqlString.append(" and student_id = "+selectedCourse.getStudent_id());
		}
		if(selectedCourse.getCourse_id() != 0){
			sqlString.append(" and course_id ="+selectedCourse.getCourse_id());
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sqlString.toString().replaceFirst("and", "where"));
			ResultSet executeQuery = preparedStatement.executeQuery();
			while(executeQuery.next()){
				SelectedCourse sc = new SelectedCourse();
				sc.setId(executeQuery.getInt("id"));
				sc.setStudent_id(executeQuery.getInt("student_id"));
				sc.setCourse_id(executeQuery.getInt("course_id"));
				retList.add(sc);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retList;
	}
	public boolean isSelected(SelectedCourse selectedCourse){
		String sql = "select * from s_selected_course where student_id=? and course_id = ?";
		try {
			PreparedStatement prst = con.prepareStatement(sql);//把sql语句传给数据库操作对象
			prst.setInt(1, selectedCourse.getStudent_id());
			prst.setInt(2, selectedCourse.getCourse_id());
			ResultSet executeQuery = prst.executeQuery();
			if(executeQuery.next()){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean delete(int id){
		String sql = "delete from s_selected_course where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
}

学生信息的界面：

package com.artisan.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.artisan.model.Admin;
import com.artisan.model.Student;
import com.artisan.model.StudentClass;
import com.artisan.util.StringUtil;

public class StudentDao extends BaseDao {
	public boolean addStudent(Student student){
		String sql = "insert into s_student values(null,?,?,?,?)";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, student.getName());
			preparedStatement.setInt(2, student.getClassId());
			preparedStatement.setString(3, student.getPassword());
			preparedStatement.setString(4, student.getSex());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public List getStudentList(Student student){
		List retList = new ArrayList();
		StringBuffer sqlString = new StringBuffer("select * from s_student");
		if(!StringUtil.isEmpty(student.getName())){
			sqlString.append(" and name like '%"+student.getName()+"%'");
		}
		if(student.getClassId() != 0){
			sqlString.append(" and classId ="+student.getClassId());
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sqlString.toString().replaceFirst("and", "where"));
			ResultSet executeQuery = preparedStatement.executeQuery();
			while(executeQuery.next()){
				Student s = new Student();
				s.setId(executeQuery.getInt("id"));
				s.setName(executeQuery.getString("name"));
				s.setClassId(executeQuery.getInt("classId"));
				s.setSex(executeQuery.getString("sex"));
				s.setPassword(executeQuery.getString("password"));
				retList.add(s);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retList;
	}
	public boolean delete(int id){
		String sql = "delete from s_student where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean update(Student student){
		String sql = "update s_student set name=?, classId=?,sex=?,password=? where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, student.getName());
			preparedStatement.setInt(2, student.getClassId());
			preparedStatement.setString(3, student.getSex());
			preparedStatement.setString(4, student.getPassword());
			preparedStatement.setInt(5, student.getId());
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public String editPassword(Student student,String newPassword){
		String sql = "select * from s_student where id=? and password=?";
		PreparedStatement prst = null;
		int id = 0;
		try {
			prst = con.prepareStatement(sql);
			prst.setInt(1, student.getId());
			prst.setString(2, student.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(!executeQuery.next()){
				String retString = "旧密码错误！";
				return retString;
			}
			id = executeQuery.getInt("id");
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}//把sql语句传给数据库操作对象
		String retString = "修改失败";
		String sqlString = "update s_student set password = ? where id = ?";
		try {
			prst = con.prepareStatement(sqlString);
			prst.setString(1, newPassword);
			prst.setInt(2, id);
			int rst = prst.executeUpdate();
			if(rst > 0){
				retString = "密码修改成功！";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}//把sql语句传给数据库操作对象
		return retString;
	}
	public Student login(Student student){
		String sql = "select * from s_student where name=? and password=?";
		Student studentRst = null;
		try {
			PreparedStatement prst = con.prepareStatement(sql);//把sql语句传给数据库操作对象
			prst.setString(1, student.getName());
			prst.setString(2, student.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(executeQuery.next()){
				studentRst = new Student();
				studentRst.setId(executeQuery.getInt("id"));
				studentRst.setClassId(executeQuery.getInt("classId"));
				studentRst.setName(executeQuery.getString("name"));
				studentRst.setPassword(executeQuery.getString("password"));
				studentRst.setSex(executeQuery.getString("sex"));
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return studentRst;
	}
}

老师信息的界面：

package com.artisan.dao;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.artisan.model.Student;
import com.artisan.model.Teacher;
import com.artisan.util.StringUtil;

public class TeacherDao extends BaseDao {
	public boolean addTeacher(Teacher teacher){
		String sql = "insert into s_teacher values(null,?,?,?,?,?)";
		try {
			java.sql.PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, teacher.getName());
			preparedStatement.setString(2, teacher.getSex());
			preparedStatement.setString(3, teacher.getTitle());
			preparedStatement.setInt(4, teacher.getAge());
			preparedStatement.setString(5, teacher.getPassword());
			if(preparedStatement.executeUpdate() > 0)return true;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}

	public List getTeacherList(Teacher teacher) {
		// TODO Auto-generated method stub
		List retList = new ArrayList();
		StringBuffer sqlString = new StringBuffer("select * from s_teacher");
		if(!StringUtil.isEmpty(teacher.getName())){
			sqlString.append(" where name like '%"+teacher.getName()+"%'");
		}
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sqlString.toString());
			ResultSet executeQuery = preparedStatement.executeQuery();
			while(executeQuery.next()){
				Teacher t = new Teacher();
				t.setId(executeQuery.getInt("id"));
				t.setName(executeQuery.getString("name"));
				t.setSex(executeQuery.getString("sex"));
				t.setTitle(executeQuery.getString("title"));
				t.setAge(executeQuery.getInt("age"));
				t.setPassword(executeQuery.getString("password"));
				retList.add(t);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return retList;
	}
	public boolean delete(int id){
		String sql = "delete from s_teacher where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setInt(1, id);
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public boolean update(Teacher teacher){
		String sql = "update s_teacher set name=?, sex=?,title=?,age=?,password=? where id=?";
		try {
			PreparedStatement preparedStatement = con.prepareStatement(sql);
			preparedStatement.setString(1, teacher.getName());
			preparedStatement.setString(2, teacher.getSex());
			preparedStatement.setString(3, teacher.getTitle());
			preparedStatement.setInt(4, teacher.getAge());
			preparedStatement.setString(5, teacher.getPassword());
			preparedStatement.setInt(6, teacher.getId());
			if(preparedStatement.executeUpdate() > 0){
				return true;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	public Teacher login(Teacher teacher){
		String sql = "select * from s_teacher where name=? and password=?";
		Teacher teacherRst = null;
		try {
			PreparedStatement prst = con.prepareStatement(sql);//把sql语句传给数据库操作对象
			prst.setString(1, teacher.getName());
			prst.setString(2, teacher.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(executeQuery.next()){
				teacherRst = new Teacher();
				teacherRst.setId(executeQuery.getInt("id"));
				teacherRst.setName(executeQuery.getString("name"));
				teacherRst.setPassword(executeQuery.getString("password"));
				teacherRst.setSex(executeQuery.getString("sex"));
				teacherRst.setAge(executeQuery.getInt("Age"));
				teacherRst.setTitle(executeQuery.getString("title"));
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return teacherRst;
	}
	public String editPassword(Teacher teacher,String newPassword){
		String sql = "select * from s_teacher where id=? and password=?";
		PreparedStatement prst = null;
		int id = 0;
		try {
			prst = con.prepareStatement(sql);
			prst.setInt(1, teacher.getId());
			prst.setString(2, teacher.getPassword());
			ResultSet executeQuery = prst.executeQuery();
			if(!executeQuery.next()){
				String retString = "旧密码错误！";
				return retString;
			}
			id = executeQuery.getInt("id");
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}//把sql语句传给数据库操作对象
		String retString = "修改失败";
		String sqlString = "update s_teacher set password = ? where id = ?";
		try {
			prst = con.prepareStatement(sqlString);
			prst.setString(1, newPassword);
			prst.setInt(2, id);
			int rst = prst.executeUpdate();
			if(rst > 0){
				retString = "密码修改成功！";
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}//把sql语句传给数据库操作对象
		return retString;
	}
}