Spring Boot Webflux R2dbc一对一关系表问题

rsl1atfo  于 2024-01-06  发布在  Spring
关注(0)|答案(4)|浏览(333)

大家好，我正在用R2 dbc（非阻塞）编写Rest API项目，但问题是表关系
任务模型

  1. @Getter
  2.  @Setter
  3.  @Entity(name = "task")
  4.  @Table(name = "task")
  5.  public class Task {
  7.     @Id
  8.     @Column(name = "id",unique = true,nullable = false)
  9.     private Integer id;
  11.     @Column(name = "comment_count")
  12.     private Integer comment_count;
  14.     @Column(name = "completed")
  15.     private Boolean completed;
  17.     @Column(name = "content")
  18.     private String  content;
  20.     @Column(name = "url")
  21.     private String  url;
  23.     @Column(name = "orderdata")
  24.     private Integer orderdata;
  26.     @Column(name = "priority")
  27.     private Integer priority;
  29.     @OneToOne
  30.     @JoinColumn(name = "due_id")//this is relation table Due but this relation retunr response null
  31.     private Due due;
  33.  }

字符串

到期型号

  1. @Getter
  2.   @Setter//Lombok library
  3.   @Entity
  4.   @Table(name = "due")
  5.   public class Due {
  7.     @Id
  8.     @Column(nullable = false, unique = true, updatable = false)
  9.     private Integer id;
  11.    @Column(name = "date_data")
  12.    private Date date_Data;
  14.    @Column
  15.    private Boolean recurring;
  17.    @Column(name = "string_data")
  18.   private String string_data;
  20. }

型

Tasks Repository//此React式crud repositroy

  1. @Repository
  2.      public interface TasksRepository extends ReactiveCrudRepository<Task,Integer> {
  4.       }

型

任务管理器//这是业务层

  1. @Component
  2.    @Slf4j
  3.    @RequiredArgsConstructor
  4.    public class  TaskManager {
  6.           private final TasksRepository tasksRepository;
  8.           public Flux<Task> findAll() {
  9.            return tasksRepository.findAll();
  10.           }
  12.       }

型

任务服务//此为服务层

  1. @Service
  2.     @RequiredArgsConstructor
  3.     public class TasksService {
  5.         private final TaskManager taskManager;
  7.           public Flux<Task> getAll() {
  8.             return taskManager.findAll();
  9.       }
  10.     }

型

任务控制器

  1. @RestController
  2.   @RequestMapping("/api/tasks")
  3.   @RequiredArgsConstructor
  4.   public class TasksController {
  6.         private final TasksService tasksService;
  8.          @GetMapping
  9.          public Flux<Task> getAllTasks(){
  10.           return tasksService.getAll();
  11.        }
  12.      }

型
任务响应
我的Rest API响应任务

  1. {
  2.         "id": 1,
  3.         "comment_count": 10,
  4.         "completed": false,
  5.         "content": "new content",
  6.         "url": "http:8085.com",
  7.         "orderdata": 5,
  8.         "priority": 5,
  9.         "due": {
  10.              "id": 3,
  11.              "date_Data": null,
  12.              "recurring": null,
  13.              "string_data": null
  14.  
  15.       }

型

问题一对一关系响应空什么是问题？请帮助我谢谢

误差轨迹

  1. 2021-03-20 20:49:57.161 ERROR 13652 --- [actor-tcp-nio-1] 
  2.    r.n.channel.ChannelOperationsHandler     : [id: 0x1126662b, 
  3.     L:/127.0.0.1:55827 - R:localhost/127.0.0.1:5432] Error was received while 
  4.      reading the incoming data. The connection will be closed.
  6.     java.lang.StackOverflowError: null
  7.       at  io.netty.util.internal.ReferenceCountUpdater
  8.      .isLiveNonVolatile(ReferenceCountUpdt 
  9.      er.java:88) ~[netty-common-4.1.59.Final.jar:4.1.59.Final]
  10.          at 
  11.       io.netty.buffer.AbstractReferenceCountedByteBuf
  12.       .isAccessible(AbstractReferenceCountedByteBuf.java:56) ~[netty-buffer- 
  13.        4.1.59.Final.jar:4.1.59.Final]
  14.        at io.netty.buffer.AbstractByteBuf.ensureAccessible(AbstractByteBuf.java:1455) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  15. at io.netty.buffer.AbstractByteBuf.checkIndex(AbstractByteBuf.java:1385) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  16. at io.netty.buffer.UnsafeByteBufUtil.getBytes(UnsafeByteBufUtil.java:481) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  17. at io.netty.buffer.PooledUnsafeDirectByteBuf.getBytes(PooledUnsafeDirectByteBuf.java:130) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  18. at io.netty.buffer.PooledSlicedByteBuf.getBytes(PooledSlicedByteBuf.java:235) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  19. at io.netty.buffer.ByteBufUtil.decodeString(ByteBufUtil.java:1147) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  20. at io.netty.buffer.AbstractByteBuf.toString(AbstractByteBuf.java:1248) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  21. at io.netty.buffer.AbstractByteBuf.getCharSequence(AbstractByteBuf.java:515) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  22. at io.netty.buffer.AbstractByteBuf.readCharSequence(AbstractByteBuf.java:520) ~[netty-buffer-4.1.59.Final.jar:4.1.59.Final]
  23. at io.r2dbc.postgresql.util.ByteBufUtils.decode(ByteBufUtils.java:42) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  24. at io.r2dbc.postgresql.codec.AbstractNumericCodec.decodeNumber(AbstractNumericCodec.java:122) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  25. at io.r2dbc.postgresql.codec.AbstractNumericCodec.decodeNumber(AbstractNumericCodec.java:89) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  26. at io.r2dbc.postgresql.codec.IntegerCodec.doDecode(IntegerCodec.java:49) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  27. at io.r2dbc.postgresql.codec.IntegerCodec.doDecode(IntegerCodec.java:30) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  28. at io.r2dbc.postgresql.codec.AbstractCodec.decode(AbstractCodec.java:82) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  29. at io.r2dbc.postgresql.codec.DefaultCodecs.decode(DefaultCodecs.java:149) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  30. at io.r2dbc.postgresql.PostgresqlRow.decode(PostgresqlRow.java:90) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  31. at io.r2dbc.postgresql.PostgresqlRow.get(PostgresqlRow.java:77) ~[r2dbc-postgresql-0.8.6.RELEASE.jar:0.8.6.RELEASE]
  32. at io.r2dbc.spi.Row.get(Row.java:76) ~[r2dbc-spi-0.8.3.RELEASE.jar:na]
  33. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:173) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  34. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  35. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  36. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  37. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  38. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  39. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  40. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  41. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  42. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  43. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  44. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  45. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  46. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  47. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  48. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readEntityFrom(MappingR2dbcConverter.java:294) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]
  49. at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:166) ~[spring-data-r2dbc-1.2.5.jar:1.2.5]

型

spring-boot

4条答案

按热度按时间
fafcakar

fafcakar1#

R2DBC不支持关系，因此JoinColumn注解将不起作用。相反，您可以创建一个DueRepository并手动获取此实体。

赞(0）分享  回复(0）举报  2024-01-06
bsxbgnwa

bsxbgnwa2#

当我在一个服务中做一些查询时，我遇到了这个情况。考虑到“R2DBC”不支持“JoinColumn”，我做的是在仓库中构建一个自定义查询。

  1. @Query("SELECT * FROM task INNER JOIN due USING (id) WHERE id=:id")
  2. Mono<NewDto> getCompleteTrx(String id);

字符串
但重要的是，您有一个Dto，其中包含要连接的两个表的对象，但它没有“table”注解。

  1. @Getter
  2.   @Setter
  3.   @Entity
  4.   public class NewDto { // depends on the relation you need
  6.     @Column(name = "id")
  7.     private Integer id;
  9.     @Column(name = "comment_count")
  10.     private Integer comment_count;
  12.     @Column(name = "completed")
  13.     private Boolean completed;
  15.     @Column(name = "content")
  16.     private String  content;
  18.     @Column(name = "url")
  19.     private String  url;
  21.     @Column(name = "orderdata")
  22.     private Integer orderdata;
  24.     @Column(name = "priority")
  25.     private Integer priority;
  27.     @Column(name = "date_data")
  28.     private Date date_Data;
  30.     @Column(name = "string_data")
  31.     private String string_data;
  32.     ...
  33. }

型
通过这样做，我可以解决我的问题，因为我需要连接3个表，我不想做3个查询，这样只需要一个查询。然后你可以将DTOMap到你需要的对象。

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赞(0）分享  回复(0）举报  2024-01-06
bejyjqdl

bejyjqdl3#

我认为您还应该将源代码中的层数限制为Controller和Service（业务逻辑在这里）。

赞(0）分享  回复(0）举报  2024-01-06
wb1gzix0

wb1gzix04#

好吧，伙计，首先，为什么这个“到期”实体需要成为它自己的实体？我的意思是，一个任务可能有一个截止日期，它可能是重复的。保持简单。
关于代码，不考虑域建模方面：
使用Long或UUID作为ID字段类型。就我个人而言，我从未在生产环境中见过int。
为这些“到期”实体创建一个CrudRepo，检查是否可以自己查询它们。编写一个测试来验证这一点。
我的猜测是“JoinTable”注解是多余的和/或配置错误的。尝试“Due.ID”而不是“Due_ID”来告诉它应该接受Due对象的哪个字段。

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