SpringBoot整合SpringDataJPA

一、SpringBootData JPA介绍
  SpringData：其实SpringData就是Spring提供了一个操作数据的框架。而SpringData JPA只是SpringData框架下的一个基于JPA标准操作数据的模块。
  SpringData JPA：基于JPA的标准数据进行操作。简化操作持久层的代码。只需要编写接口就可以。


二、SpringBoot整合SpringData JPA

1、导入maven依赖
 在原有的SprigBoot的maven依赖的基础下加上JPA的依赖


2、application.properties文件中添加配置


3、实体类

import javax.persistence.*;

@Entity
@Table(name="t_users")
public class Users {

	@Id	//主键id
	@GeneratedValue(strategy=GenerationType.IDENTITY)//主键生成策略
	@Column(name="id")//数据库字段名
	private Integer id;
	
	@Column(name="name")
	private String name;
	
	@Column(name="age")
	private Integer age;
	
	@Column(name="address")
	private String address;

	@ManyToOne(cascade = CascadeType.PERSIST)	//表示多方
	@JoinColumn(name ="role_id")	//维护一个外键，外键在Users一侧
	private Roles roles;

	public Roles getRoles() {
		return roles;
	}

	public void setRoles(Roles roles) {
		this.roles = roles;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	@Override
	public String toString() {
		final StringBuffer sb = new StringBuffer("Users{");
		sb.append("id=").append(id);
		sb.append(", name='").append(name).append('\'');
		sb.append(", age=").append(age);
		sb.append(", address='").append(address).append('\'');
		sb.append(", roles=").append(roles);
		sb.append('}');
		return sb.toString();
	}
}

4、编写Dao接口

import org.springframework.data.jpa.repository.JpaRepository;

import com.bjsxt.pojo.Users;
/**
 * 参数一 T :当前需要映射的实体
 * 参数二 ID :当前映射的实体中的OID的类型
 *
 */
public interface UsersRepository extends JpaRepository<Users,Integer> {

}

6、在pom文件中添加测试启动器的坐标


7、测试

三、SpringBoot JPA提供的核心接口

 1、Repository接口
 2、CrudRepository接口
 3、PagingAndSortingRepository接口
 4、JpaRepository接口
 5、JPASpecificationExecutor接口


四、Repository接口的使用

 提供了方法名称命名查询方式
 提供了基于@Query注解查询与更新

1、dao层接口（方法名称命名查询方式）

import com.bjsxt.pojo.Users;
import org.springframework.data.repository.Repository;

import java.util.List;

/**
 * Repository接口方法名称命名查询
 *
 */
public interface UsersRepositoryByName extends Repository<Users,Integer> {
    //方法名称必须要遵循驼峰式命名规则，findBy（关键字）+属性名称（首字母大写）+查询条件（首字母大写）
    List<Users> findByName(String name);

    List<Users> findByNameAndAge(String name,Integer age);

    List<Users> findByNameLike(String name);

}

2、测试

/**
	 * Repository
	 */
	@Test
	public void UsersRepositoryByName(){
		List<Users> list=this.usersRepositoryByName.findByName("张三");
		for (Users users:list){
			System.out.println(users);
		}
	}

	@Test
	public void findByNameAndAge(){
		List<Users> list=this.usersRepositoryByName.findByNameAndAge("张三",20);
		for (Users users:list){
			System.out.println(users);
		}
	}

	@Test
	public void findByNameLike() {
		List<Users> list = this.usersRepositoryByName.findByNameLike("张%");
		for (Users users : list) {
			System.out.println(users);
		}
	}

3、dao层接口编写（基于@Query注解查询与更新）

import com.bjsxt.pojo.Users;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;


import java.util.List;

/**
 * 〈一句话功能简述〉<br> 
 *  Repository    @Query
 *
 * @author admin
 * @create 2019/5/22
 * @since 1.0.0
 */
public interface UsersRepositoryQueryAnnotation extends JpaRepository<Users,Integer> {
    @Query("from Users where name = ?")
    List<Users> queryByNameUseHQL(String name);

    @Query(value = "select * from t_user where name=?",nativeQuery = true)
    List<Users> queryByNameUseSQL(String name);

    @Query("update Users set name=? where id=?")
    @Modifying  //需要执行一个更新操作
    void updateUsersNameById(String name,Integer id);

}

4、测试

	/**
	 * Repository--@Query测试
	 */
	@Test
	public void testQueryByNameUseSQL() {
		List<Users> list = this.usersRepositoryQueryAnnotation.queryByNameUseSQL("张三");
		for (Users users : list) {
			System.out.println(users);
		}
	}

	/**
	 * Repository--@Query测试
	 */
	@Test
	@Transactional //@Transactional与@Test 一起使用时 事务是自动回滚的。
	@Rollback(false) //取消自动回滚
	public void testUpdateUsersNameById() {
		this.usersRepositoryQueryAnnotation.updateUsersNameById("张三三", 1);
	}

五、CrudRepository接口的使用
  CrudRepository接口,主要是完成一些增删改查的操作。注意：CrudRepository接口继承了Repository接口

1、编写dao层接口

import com.bjsxt.pojo.Users;
import org.springframework.data.repository.CrudRepository;

public interface UsersRepositoryCrudRepository extends CrudRepository<Users,Integer> {
}

2、测试

@Test
	public void testCrudRepositorySave() {
		Users users=new Users();
		users.setName("青衫");
		users.setAge(30);
		users.setAddress("湖南怀化");
		this.usersRepositoryCrudRepository.save(users);
	}

	@Test
	public void testCrudRepositoryUpdate() {
		Users users=new Users();
		users.setId(4);
		users.setName("青");
		users.setAge(18);
		users.setAddress("怀化");
		this.usersRepositoryCrudRepository.save(users);
	}

	@Test
	public void testCrudRepositoryFindOne() {

		Users users=this.usersRepositoryCrudRepository.findOne(4);
		System.out.println(users);
	}

	@Test
	public void testCrudRepositoryFindAll() {
		List<Users> list= (List<Users>) this.usersRepositoryCrudRepository.findAll();
		for (Users user:list){
			System.out.println(user);
		}
	}

	@Test
	public void testCrudRepositoryDeleteById() {
		this.usersRepositoryCrudRepository.delete(4);
		
	}

六、PagingAndSortingRepository接口的使用
 该接口提供了分页与排序的操作，注意：该接口继承了CrudRepository接口

1、编写dao层

import com.bjsxt.pojo.Users;
import org.springframework.data.repository.PagingAndSortingRepository;

public interface UsersRepositoryPagingAndSorting extends PagingAndSortingRepository<Users,Integer> {

}

2、测试

@Test
	public void testPagingAndSortingRepositorySort() {
		//Order	定义了排序规则
		Sort.Order order=new Sort.Order(Sort.Direction.DESC,"id");
		//Sort对象封装了排序规则
		Sort sort=new Sort(order);
		List<Users> list= (List<Users>) this.usersRepositoryPagingAndSorting.findAll(sort);
		for (Users users:list){
			System.out.println(users);
		}
	}

	@Test
	public void testPagingAndSortingRepositoryPaging() {
		//Pageable:封装了分页的参数，当前页，煤业显示的条数。注意：它的当前页是从0开始
		//PageRequest(page,size):page表示当前页，size表示每页显示多少条
		Pageable pageable=new PageRequest(1,2);
		Page<Users> page=this.usersRepositoryPagingAndSorting.findAll(pageable);
		System.out.println("数据的总条数："+page.getTotalElements());
		System.out.println("总页数："+page.getTotalPages());
		List<Users> list=page.getContent();
		for (Users users:list){
			System.out.println(users);
		}
	}

	@Test
	public void testPagingAndSortingRepositorySortAndPaging() {
		Sort sort=new Sort(new Sort.Order(Sort.Direction.DESC,"id"));
		Pageable pageable=new PageRequest(0,2,sort);
		Page<Users> page=this.usersRepositoryPagingAndSorting.findAll(pageable);
		System.out.println("数据的总条数："+page.getTotalElements());
		System.out.println("总页数："+page.getTotalPages());
		List<Users> list=page.getContent();
		for (Users users:list){
			System.out.println(users);
		}
	}

七、JpaRepository接口

 该接口继承了PagingAndSortingRepository。对继承的父接口中方法的返回值进行适配。

1、dao层接口编写

/**
 * 参数一 T :当前需要映射的实体
 * 参数二 ID :当前映射的实体中的OID的类型
 *
 */
public interface UsersRepository extends JpaRepository<Users,Integer> {

}

2、测试

/**
	 * JpaRepository	排序测试
	 */
	@Test
	public void testJpaRepositorySort() {
		//Order	定义了排序规则
		Sort.Order order=new Sort.Order(Sort.Direction.DESC,"id");
		//Sort对象封装了排序规则
		Sort sort=new Sort(order);
		List<Users> list= this.usersRepository.findAll(sort);
		for (Users users:list){
			System.out.println(users);
		}
	}

八、JPASpecificationExecutor接口

 该接口主要是提供了多条件查询的支持，并且可以在查询中添加排序与分页。注意JPASpecificationExecutor是单独存在的。完全独立

1、dao层接口编写

import com.bjsxt.pojo.Users;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * 〈一句话功能简述〉<br> 
 *  JpaSpecificationExecutor
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
public interface UserRepositorySpecification extends JpaRepository<Users,Integer>,JpaSpecificationExecutor<Users> {
}

2、测试

/**
	 * JpaSpecificationExecutor		单条件查询
	 */
	@Test
	public void testJpaSpecificationExecutor1() {
		/**
		 * Specification:用于封装查查询条件
		 */
		Specification<Users> spec=new Specification<Users>() {
			//Predicate：封装了单个查询条件

			/**
			 * @param root		对查询对象属性的封装
			 * @param criteriaQuery	封装了我们要执行的查询中的各个部分的信息，select from order
			 * @param criteriaBuilder	查询条件的构造器
			 * @return
			 */
			@Override
			public Predicate toPredicate(Root<Users> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
				//where name="张三"
				/**
				 * 参数一：查询的属性
				 * 参数二：条件的值
				 */
				Predicate predicate=criteriaBuilder.equal(root.get("name"),"张三");
				return predicate;
			}
		};
		List<Users> list=this.userRepositorySpecification.findAll(spec);
		for (Users users:list){
			System.out.println(users);
		}
	}

	/**
	 * JpaSpecificationExecutor		多条件查询方式一
	 */
	@Test
	public void testJpaSpecificationExecutor2() {
		/**
		 * Specification:用于封装查查询条件
		 */
		Specification<Users> spec=new Specification<Users>() {
			//Predicate：封装了单个查询条件

			/**
			 * @param root		对查询对象属性的封装
			 * @param criteriaQuery	封装了我们要执行的查询中的各个部分的信息，select from order
			 * @param criteriaBuilder	查询条件的构造器
			 * @return
			 */
			@Override
			public Predicate toPredicate(Root<Users> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
				//where name="张三" and age=20
				/**
				 * 参数一：查询的属性
				 * 参数二：条件的值
				 */
				List<Predicate> list=new ArrayList<>();
				list.add(criteriaBuilder.equal(root.get("name"),"张三"));
				list.add(criteriaBuilder.equal(root.get("age"),20));
				Predicate[] arr=new Predicate[list.size()];
				return criteriaBuilder.and(list.toArray(arr));
			}
		};
		List<Users> list=this.userRepositorySpecification.findAll(spec);
		for (Users users:list){
			System.out.println(users);
		}
	}

	/**
	 * JpaSpecificationExecutor		多条件查询方式二
	 */
	@Test
	public void testJpaSpecificationExecutor3() {
		/**
		 * Specification:用于封装查查询条件
		 */
		Specification<Users> spec=new Specification<Users>() {
			//Predicate：封装了单个查询条件

			/**
			 * @param root		对查询对象属性的封装
			 * @param criteriaQuery	封装了我们要执行的查询中的各个部分的信息，select from order
			 * @param criteriaBuilder	查询条件的构造器
			 * @return
			 */
			@Override
			public Predicate toPredicate(Root<Users> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
				//where name="张三" and age=20
				/**
				 * 参数一：查询的属性
				 * 参数二：条件的值
				 */
				/*List<Predicate> list=new ArrayList<>();
				list.add(criteriaBuilder.equal(root.get("name"),"张三"));
				list.add(criteriaBuilder.equal(root.get("age"),20));
				Predicate[] arr=new Predicate[list.size()];*/
				//(name='张三' and age=20) or id=2
				return criteriaBuilder.or(criteriaBuilder.and(criteriaBuilder.equal(root.get("name"),"张三"),criteriaBuilder.equal(root.get("age"),20)),criteriaBuilder.equal(root.get("id"),1));
			}
		};

		Sort sort=new Sort(new Sort.Order(Sort.Direction.DESC,"id"));
		List<Users> list=this.userRepositorySpecification.findAll(spec,sort);
		for (Users users:list){
			System.out.println(users);
		}
	}

九、关联映射操作

1、一对多的关联关系
  需求：角色与用户的一对多的关联关系
  角色：一方
  用户：多方

2、实体类

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

/**
 * 〈一句话功能简述〉<br> 
 * 〈〉
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
@Entity
@Table(name = "t_roles")
public class Roles {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "role_id")
    private Integer roleId;
    @Column(name = "role_name")
    private String roleName;

    @OneToMany(mappedBy = "roles")
    private Set<Users> users=new HashSet<>();

    public Integer getRoleId() {
        return roleId;
    }

    public void setRoleId(Integer roleId) {
        this.roleId = roleId;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public Set<Users> getUsers() {
        return users;
    }

    public void setUsers(Set<Users> users) {
        this.users = users;
    }


}

package com.bjsxt.pojo;

import javax.persistence.*;

@Entity
@Table(name="t_users")
public class Users {

	@Id	//主键id
	@GeneratedValue(strategy=GenerationType.IDENTITY)//主键生成策略
	@Column(name="id")
	private Integer id;
	
	@Column(name="name")
	private String name;
	
	@Column(name="age")
	private Integer age;
	
	@Column(name="address")
	private String address;

	@ManyToOne(cascade = CascadeType.PERSIST)	//表示多方
	@JoinColumn(name ="role_id")	//维护一个外键，外键在Users一侧
	private Roles roles;

	public Roles getRoles() {
		return roles;
	}

	public void setRoles(Roles roles) {
		this.roles = roles;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	@Override
	public String toString() {
		final StringBuffer sb = new StringBuffer("Users{");
		sb.append("id=").append(id);
		sb.append(", name='").append(name).append('\'');
		sb.append(", age=").append(age);
		sb.append(", address='").append(address).append('\'');
		sb.append(", roles=").append(roles);
		sb.append('}');
		return sb.toString();
	}
}

3、dao层接口编写

/**
 * 参数一 T :当前需要映射的实体
 * 参数二 ID :当前映射的实体中的OID的类型
 *
 */
public interface UsersRepository extends JpaRepository<Users,Integer> {

}

4、测试

/**
 * Copyright (C), 2015-2019, XXX有限公司
 * FileName: ManyToManyTest
 * Author:   admin
 * Date:     2019/5/23 14:19
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.bjsxt.test;

import com.bjsxt.App;
import com.bjsxt.dao.RolesRepository;
import com.bjsxt.pojo.Menus;
import com.bjsxt.pojo.Roles;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.Set;

/**
 * 〈一句话功能简述〉<br> 
 * 多对多的关联关系的测试
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = App.class)
public class ManyToManyTest {

    @Autowired
    private RolesRepository rolesRepository;

    /**
     * 添加测试
     */
    @Test
    public void testSave(){
        //创建角色对象
        Roles roles=new Roles();
        roles.setRoleName("项目经理");
        //创建菜单对象
        Menus menus=new Menus();
        menus.setMenusName("xxxx管理系统");
        menus.setFatherId(0);

        Menus menus2=new Menus();
        menus2.setFatherId(1);
        menus2.setMenusName("项目管理");
        //关联
        roles.getMenus().add(menus);
        roles.getMenus().add(menus2);
        menus.getRoles().add(roles);
        menus2.getRoles().add(roles);
        //保存
        this.rolesRepository.save(roles);
    }

    /**
     * 查询操作
     */
    @Test
    public void testFind(){
        Roles roles=this.rolesRepository.findOne(2);
        System.out.println(roles.getRoleName());
        Set<Menus> menus=roles.getMenus();
        for (Menus menu:menus){
            System.out.println(menu);
        }
    }
}

&nbsp；
5、多对多的关联关系
&nbsp；
 角色与菜单多对多关联关系
 菜单：多方
 角色：多方

6、实体类

/**
 * Copyright (C), 2015-2019, XXX有限公司
 * FileName: Menus
 * Author:   admin
 * Date:     2019/5/23 14:06
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.bjsxt.pojo;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

/**
 * 〈一句话功能简述〉<br> 
 * 〈〉
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
@Entity
@Table(name = "t_menus")
public class Menus {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "menus_id")
    private Integer menusId;
    @Column(name = "menus_name")
    private String menusName;
    @Column(name = "menus_url")
    private String menusUrl;
    @Column(name = "father_id")
    private Integer fatherId;

    @ManyToMany(mappedBy = "menus")
    private Set<Roles> roles=new HashSet<>();

    public Set<Roles> getRoles() {
        return roles;
    }

    public void setRoles(Set<Roles> roles) {
        this.roles = roles;
    }

    public Integer getMenusId() {
        return menusId;
    }

    public void setMenusId(Integer menusId) {
        this.menusId = menusId;
    }

    public String getMenusName() {
        return menusName;
    }

    public void setMenusName(String menusName) {
        this.menusName = menusName;
    }

    public String getMenusUrl() {
        return menusUrl;
    }

    public void setMenusUrl(String menusUrl) {
        this.menusUrl = menusUrl;
    }

    public Integer getFatherId() {
        return fatherId;
    }

    public void setFatherId(Integer fatherId) {
        this.fatherId = fatherId;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("Menus{");
        sb.append("menusId=").append(menusId);
        sb.append(", menusName='").append(menusName).append('\'');
        sb.append(", menusUrl='").append(menusUrl).append('\'');
        sb.append(", fatherId=").append(fatherId);
        sb.append('}');
        return sb.toString();
    }
}

/**
 * Copyright (C), 2015-2019, XXX有限公司
 * FileName: Roles
 * Author:   admin
 * Date:     2019/5/23 11:02
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.bjsxt.pojo;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

/**
 * 〈一句话功能简述〉<br> 
 * 〈〉
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
@Entity
@Table(name = "t_roles")
public class Roles {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "role_id")
    private Integer roleId;
    @Column(name = "role_name")
    private String roleName;

    @OneToMany(mappedBy = "roles")
    private Set<Users> users=new HashSet<>();

    @ManyToMany(cascade = CascadeType.PERSIST,fetch = FetchType.EAGER)
    //映射中间表  joinColumns:当前表中的主键关联中间表的外键
    @JoinTable(name = "t_roles_menus",joinColumns =@JoinColumn(name = "role_id"),inverseJoinColumns = @JoinColumn(name = "menu_id"))
    private Set<Menus> menus=new HashSet<>();

    public Set<Menus> getMenus() {
        return menus;
    }

    public void setMenus(Set<Menus> menus) {
        this.menus = menus;
    }

    public Integer getRoleId() {
        return roleId;
    }

    public void setRoleId(Integer roleId) {
        this.roleId = roleId;
    }

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public Set<Users> getUsers() {
        return users;
    }

    public void setUsers(Set<Users> users) {
        this.users = users;
    }
}

7、dao层接口

/**
 * Copyright (C), 2015-2019, XXX有限公司
 * FileName: RolesRepository
 * Author:   admin
 * Date:     2019/5/23 14:21
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.bjsxt.dao;

import com.bjsxt.pojo.Roles;
import org.springframework.data.jpa.repository.JpaRepository;

/**
 * 〈一句话功能简述〉<br> 
 * 〈〉
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
public interface RolesRepository extends JpaRepository<Roles,Integer> {

}

8、测试

/**
 * Copyright (C), 2015-2019, XXX有限公司
 * FileName: ManyToManyTest
 * Author:   admin
 * Date:     2019/5/23 14:19
 * Description:
 * History:
 * <author>          <time>          <version>          <desc>
 * 作者姓名           修改时间           版本号              描述
 */
package com.bjsxt.test;

import com.bjsxt.App;
import com.bjsxt.dao.RolesRepository;
import com.bjsxt.pojo.Menus;
import com.bjsxt.pojo.Roles;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.Set;

/**
 * 〈一句话功能简述〉<br> 
 * 多对多的关联关系的测试
 *
 * @author admin
 * @create 2019/5/23
 * @since 1.0.0
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = App.class)
public class ManyToManyTest {

    @Autowired
    private RolesRepository rolesRepository;

    /**
     * 添加测试
     */
    @Test
    public void testSave(){
        //创建角色对象
        Roles roles=new Roles();
        roles.setRoleName("项目经理");
        //创建菜单对象
        Menus menus=new Menus();
        menus.setMenusName("xxxx管理系统");
        menus.setFatherId(0);

        Menus menus2=new Menus();
        menus2.setFatherId(1);
        menus2.setMenusName("项目管理");
        //关联
        roles.getMenus().add(menus);
        roles.getMenus().add(menus2);
        menus.getRoles().add(roles);
        menus2.getRoles().add(roles);
        //保存
        this.rolesRepository.save(roles);
    }

    /**
     * 查询操作
     */
    @Test
    public void testFind(){
        Roles roles=this.rolesRepository.findOne(2);
        System.out.println(roles.getRoleName());
        Set<Menus> menus=roles.getMenus();
        for (Menus menu:menus){
            System.out.println(menu);
        }
    }
}