# 问题解决方案
##### 1、Cannot compare left expression of type 'java.io.Serializable' with right expression of type 'java.lang.Long'
```
使用@Query查询，因为无法解决序列化问题
```


`
分层结构从上到下：
`
```
Controller (表现层)
   ↓
Service (业务层)
   ↓
Repository (数据访问层)
```
`
对于外部集成：
`
```
Controller
   ↓
Service ←→ Integration Service (集成层)
   ↓
Repository
```

```
GET /api/users - 查询所有用户
GET /api/users/list?enabled=true - 查询所有启用的用户
GET /api/users/page?pageNum=1&pageSize=10 - 分页查询用户
```

`查询日期示例`
```
UserQuery query = new UserQuery();
query.setCreateTimeRange(
    LocalDateTime.now().minusDays(7),  // 一周内
    LocalDateTime.now()
);
query.setEnabled(true);
query.setCreateBy("admin");


@QueryField(type = QueryType.IN)
private String status;  // 可以传入 "ACTIVE,PENDING,CLOSED"

```
```
QueryDSL使用方法
@Service
@Transactional
public class UserServiceImpl extends BaseServiceImpl<User, Long> implements UserService {
    
    private final UserRoleRepository userRoleRepository;
    private final QUserRole qUserRole = QUserRole.userRole;
    
    public UserServiceImpl(UserRepository userRepository, UserRoleRepository userRoleRepository) {
        super(userRepository);
        this.userRoleRepository = userRoleRepository;
    }
    
    public Set<UserRole> getUserRoles(Long userId) {
        // 使用QueryDSL构建查询条件
        Predicate predicate = qUserRole.user.id.eq(userId);
        return StreamSupport.stream(
            userRoleRepository.findAll(predicate).spliterator(),
            false
        ).collect(Collectors.toSet());
    }
    
    public void assignRole(Long userId, Long roleId) {
        User user = findById(userId);
        Role role = roleRepository.findById(roleId)
            .orElseThrow(() -> new RuntimeException("Role not found"));
            
        // 检查是否已存在
        Predicate predicate = qUserRole.user.id.eq(userId)
            .and(qUserRole.role.id.eq(roleId));
            
        if (!userRoleRepository.exists(predicate)) {
            UserRole userRole = new UserRole(user, role);
            userRoleRepository.save(userRole);
        }
    }
}
```

```
-- 插入正常用户数据
INSERT INTO sys_user (
    username, password, nickname, email, phone, 
    enabled, deleted, dept_id, dept_name,
    create_by, create_time, update_by, update_time, version
) VALUES 
-- 管理员用户
('admin', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '系统管理员', 'admin@example.com', '13800138000',
true, false, 1, '技术部',
'system', '2024-01-01 09:00:00', null, null, 0),

-- 普通用户
('user01', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '张三', 'zhangsan@example.com', '13800138001',
true, false, 1, '技术部',
'admin', '2024-01-02 10:00:00', null, null, 0),

('user02', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '李四', 'lisi@example.com', '13800138002',
true, false, 2, '市场部',
'admin', '2024-01-03 11:00:00', 'admin', '2024-01-04 15:00:00', 1),

-- 已禁用的用户
('disabled_user', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '王五', 'wangwu@example.com', '13800138003',
false, false, 2, '市场部',
'admin', '2024-01-05 14:00:00', 'admin', '2024-01-06 16:00:00', 1),

-- 已删除的用户
('deleted_user', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '赵六', 'zhaoliu@example.com', '13800138004',
true, true, 3, '财务部',
'admin', '2024-01-07 10:00:00', 'admin', '2024-01-08 09:00:00', 2),

-- 最近创建的用户
('new_user01', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '小明', 'xiaoming@example.com', '13800138005',
true, false, 1, '技术部',
'admin', '2024-03-01 09:00:00', null, null, 0),

('new_user02', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '小红', 'xiaohong@example.com', '13800138006',
true, false, 2, '市场部',
'admin', '2024-03-02 10:00:00', null, null, 0),

-- 多次更新的用户
('updated_user', '$2a$10$mW/yJPHjyueQ1g26YxiZNOtr6bKVF4P/w/VHLVHHhxslY.YlXhbcm', '小张', 'xiaozhang@example.com', '13800138007',
true, false, 3, '财务部',
'admin', '2024-02-01 09:00:00', 'admin', '2024-03-01 15:00:00', 5);
```