现在mysql里建了一个数据库毕业设计资料管理系统bs里面有如下表 学生表 create table student (sno varchar(10) primary key,sname varchar(20),spassword varbinary(20) not null); 管理员表 create table manager (mno varchar(10) primary key,mname varchar(20),mpassword varbinary(20) not null); 学生毕业设计表 create table gradu_design (gid int(10) AUTO_INCREMENT primary key,sno varchar(10),job_book TEXT,open_report TEXT,interim_report TEXT,week_report TEXT,gradu_paper TEXT,comment TEXT,FOREIGN KEY(sno) REFERENCES student(sno))AUTO_INCREMENT = 1; 管理员任务发布表 create table task (tid int(10) AUTO_INCREMENT primary key,mno int(10),title TEXT,content TEXT,subtime date,FOREIGN KEY(mno) REFERENCES manager(mno))AUTO_INCREMENT = 1; 请用idea里entity包中编写相应实体类和在dao包、bean包编写相应的东西,主要想实现以下功能管理员能发布任务，能查看学生毕设里的所有如（job_book、开题报告open_report、中期报告interim_report、周报week_report、毕业论文gradu_paper、文献翻译document），管理员有能对学生类实现增删改查的权限

首先，在 IDEA 中创建一个 Maven 项目，并在 pom.xml 文件中添加以下依赖项：

<!-- 数据库驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.23</version>
</dependency>

<!-- JPA -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

然后，在 `src/main/java` 目录下创建以下包：

- `com.example.bs.entity`：用于存放实体类。
- `com.example.bs.dao`：用于存放数据访问层（DAO）接口。
- `com.example.bs.bean`：用于存放业务逻辑层（Service）接口以及控制层（Controller）类。

在 `com.example.bs.entity` 包下创建以下实体类：

Student.java

package com.example.bs.entity;

import javax.persistence.*;

@Entity
@Table(name = "student")
public class Student {
    @Id
    @Column(name = "sno", length = 10)
    private String sno;

    @Column(name = "sname", length = 20)
    private String sname;

    @Column(name = "spassword", length = 20)
    private byte[] spassword;

    // 省略 getter 和 setter 方法
}

Manager.java

package com.example.bs.entity;

import javax.persistence.*;

@Entity
@Table(name = "manager")
public class Manager {
    @Id
    @Column(name = "mno", length = 10)
    private String mno;

    @Column(name = "mname", length = 20)
    private String mname;

    @Column(name = "mpassword", length = 20)
    private byte[] mpassword;

    // 省略 getter 和 setter 方法
}

GraduDesign.java

package com.example.bs.entity;

import javax.persistence.*;

@Entity
@Table(name = "gradu_design")
public class GraduDesign {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "gid", length = 10)
    private Integer gid;

    @Column(name = "job_book", columnDefinition = "TEXT")
    private String jobBook;

    @Column(name = "open_report", columnDefinition = "TEXT")
    private String openReport;

    @Column(name = "interim_report", columnDefinition = "TEXT")
    private String interimReport;

    @Column(name = "week_report", columnDefinition = "TEXT")
    private String weekReport;

    @Column(name = "gradu_paper", columnDefinition = "TEXT")
    private String graduPaper;

    @Column(name = "comment", columnDefinition = "TEXT")
    private String comment;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "sno", referencedColumnName = "sno")
    private Student student;

    // 省略 getter 和 setter 方法
}

Task.java

package com.example.bs.entity;

import javax.persistence.*;
import java.util.Date;

@Entity
@Table(name = "task")
public class Task {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "tid", length = 10)
    private Integer tid;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "mno", referencedColumnName = "mno")
    private Manager manager;

    @Column(name = "title", columnDefinition = "TEXT")
    private String title;

    @Column(name = "content", columnDefinition = "TEXT")
    private String content;

    @Column(name = "subtime")
    private Date subtime;

    // 省略 getter 和 setter 方法
}

在 `com.example.bs.dao` 包下创建以下 DAO 接口：

StudentDao.java

package com.example.bs.dao;

import com.example.bs.entity.Student;
import org.springframework.data.jpa.repository.JpaRepository;

public interface StudentDao extends JpaRepository<Student, String> {
}

ManagerDao.java

package com.example.bs.dao;

import com.example.bs.entity.Manager;
import org.springframework.data.jpa.repository.JpaRepository;

public interface ManagerDao extends JpaRepository<Manager, String> {
}

GraduDesignDao.java

package com.example.bs.dao;

import com.example.bs.entity.GraduDesign;
import org.springframework.data.jpa.repository.JpaRepository;

public interface GraduDesignDao extends JpaRepository<GraduDesign, Integer> {
}

TaskDao.java

package com.example.bs.dao;

import com.example.bs.entity.Task;
import org.springframework.data.jpa.repository.JpaRepository;

public interface TaskDao extends JpaRepository<Task, Integer> {
}

最后，在 `com.example.bs.bean` 包下创建以下类：

GraduDesignService.java

package com.example.bs.bean;

import com.example.bs.dao.GraduDesignDao;
import com.example.bs.entity.GraduDesign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class GraduDesignService {
    @Autowired
    private GraduDesignDao graduDesignDao;

    public List<GraduDesign> findAll() {
        return graduDesignDao.findAll();
    }

    public GraduDesign getById(Integer gid) {
        return graduDesignDao.getById(gid);
    }

    public void saveOrUpdate(GraduDesign graduDesign) {
        graduDesignDao.save(graduDesign);
    }

    public void deleteById(Integer gid) {
        graduDesignDao.deleteById(gid);
    }
}

TaskService.java

package com.example.bs.bean;

import com.example.bs.dao.TaskDao;
import com.example.bs.entity.Task;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class TaskService {
    @Autowired
    private TaskDao taskDao;

    public List<Task> findAll() {
        return taskDao.findAll();
    }

    public Task getById(Integer tid) {
        return taskDao.getById(tid);
    }

    public void saveOrUpdate(Task task) {
        taskDao.save(task);
    }

    public void deleteById(Integer tid) {
        taskDao.deleteById(tid);
    }
}

StudentService.java

package com.example.bs.bean;

import com.example.bs.dao.StudentDao;
import com.example.bs.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class StudentService {
    @Autowired
    private StudentDao studentDao;

    public List<Student> findAll() {
        return studentDao.findAll();
    }

    public Student getById(String sno) {
        return studentDao.getById(sno);
    }

    public void saveOrUpdate(Student student) {
        studentDao.save(student);
    }

    public void deleteById(String sno) {
        studentDao.deleteById(sno);
    }
}

ManagerService.java

package com.example.bs.bean;

import com.example.bs.dao.ManagerDao;
import com.example.bs.entity.Manager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class ManagerService {
    @Autowired
    private ManagerDao managerDao;

    public List<Manager> findAll() {
        return managerDao.findAll();
    }

    public Manager getById(String mno) {
        return managerDao.getById(mno);
    }

    public void saveOrUpdate(Manager manager) {
        managerDao.save(manager);
    }

    public void deleteById(String mno) {
        managerDao.deleteById(mno);
    }
}

在以上代码中，每个实体类对应一个 DAO 接口和一个 Service 类，其中 Service 类封装了常用的业务逻辑方法，如查询、保存、更新和删除等。控制层（Controller）类可以直接调用这些方法来实现相应的功能。