从 H2 数据库读取 TINYINT 值时出现 MappingException boolean/Boolean

Question

我正在使用 R2DBC H2 来集成测试我的反应式应用程序（基于 Spring Webflux，Java）。

版本

驱动：io.r2dbc:r2dbc-h2:0.8.4.RELEASE (Spring boot 2.3.2.RELEASE)
Java: 11
OS: Mac

我有一个 table 定义如下：

CREATE TABLE `prep_task` (
  `id` SERIAL,
  `external_id` VARCHAR(45) NOT NULL,
  `name` VARCHAR(45) NOT NULL,
  `description` VARCHAR(100) NULL,
  `is_active` TINYINT,
  PRIMARY KEY (`id`)
);

对应实体：

@Table("prep_task")
public class PrepTaskEntity implements Persistable<Long> {
  @Id
  @Column("id")
  private Long id;

  @Column("external_id")
  private String externalId;

  @Column("name")
  private String name;

  @Column("description")
  private String description;

  @Column("is_active")
  private boolean isActive;

  public Long getId() {
    return id;
  }

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

  public String getExternalId() {
    return externalId;
  }

  public void setExternalId(String externalId) {
    this.externalId = externalId;
  }

  public String getName() {
    return name;
  }

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

  public String getDescription() {
    return description;
  }

  public void setDescription(String description) {
    this.description = description;
  }

  public boolean isActive() {
    return isActive;
  }

  public void setActive(boolean active) {
    isActive = active;
  }

  @Override
  public boolean isNew() {
    return id == null;
  }


}

保存时没有问题 PrepTaskEntity 但在尝试读取时出现以下错误:

org.springframework.data.mapping.MappingException: Could not read property @org.springframework.data.relational.core.mapping.Column(value="is_active")private java.lang.Boolean com.example.demosvc.persistence.entities.PrepTaskEntity.isActive from result set!
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:172) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ⇢ Handler com.example.demosvc.controllers.PrepTaskController#getPrepTasksForGivenBU(String) [DispatcherHandler]
    |_ checkpoint ⇢ com.example.demosvc.filters.TenancyContextFilter [DefaultWebFilterChain]
    |_ checkpoint ⇢ HTTP GET "/sites/BU-002/prepTasks" [ExceptionHandlingWebHandler]
Stack trace:
        at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:172) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
        at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.read(MappingR2dbcConverter.java:133) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
        at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.read(MappingR2dbcConverter.java:116) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
        at org.springframework.data.r2dbc.convert.EntityRowMapper.apply(EntityRowMapper.java:46) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
        at org.springframework.data.r2dbc.convert.EntityRowMapper.apply(EntityRowMapper.java:29) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
        at io.r2dbc.h2.H2Result.lambda$map[=13=](H2Result.java:67) ~[r2dbc-h2-0.8.4.RELEASE.jar:0.8.4.RELEASE]
        at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:100) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
        at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:73) ~[reactor-core-3.3.8.RELEASE.jar:3.3.8.RELEASE]
...
Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.Byte] to type [java.lang.Boolean]
    at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:321) ~[spring-core-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:194) ~[spring-core-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:174) ~[spring-core-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.getPotentiallyConvertedSimpleRead(MappingR2dbcConverter.java:263) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readValue(MappingR2dbcConverter.java:187) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.readFrom(MappingR2dbcConverter.java:169) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.read(MappingR2dbcConverter.java:133) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.MappingR2dbcConverter.read(MappingR2dbcConverter.java:116) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.EntityRowMapper.apply(EntityRowMapper.java:46) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at org.springframework.data.r2dbc.convert.EntityRowMapper.apply(EntityRowMapper.java:29) ~[spring-data-r2dbc-1.1.2.RELEASE.jar:1.1.2.RELEASE]
    at io.r2dbc.h2.H2Result.lambda$map[=13=](H2Result.java:67) ~[r2dbc-h2-0.8.4.RELEASE.jar:0.8.4.RELEASE]

仅供参考，我使用 MySQL 作为 H2 的连接模式。

@Configuration
@Profile(Application.Profiles.INTEGRATION_TEST)
public class H2ConnectionConfig extends AbstractR2dbcConfiguration {

  private final R2dbcConfigProperties r2dbcConfigProperties;

  @Autowired
  public H2ConnectionConfig(R2dbcConfigProperties r2dbcConfigProperties) {
    this.r2dbcConfigProperties = r2dbcConfigProperties;
  }

  @Override
  @Bean
  public ConnectionFactory connectionFactory() {
    RoutingConnectionFactory connectionFactory = new RoutingConnectionFactory();
    Map<String, ConnectionFactory> factories = new HashMap<>();
    H2ConnectionConfiguration.Builder configurationBuilder = H2ConnectionConfiguration.builder()
        .property(H2ConnectionOption.MODE, "MySQL")
        .property(H2ConnectionOption.DB_CLOSE_DELAY, "-1")
        .property(H2ConnectionOption.DB_CLOSE_ON_EXIT, "false");
    for (String tenant : r2dbcConfigProperties.getTenants()) {
      String databaseName = r2dbcConfigProperties.getDbPrefix() + tenant;
      factories.put(tenant, new H2ConnectionFactory(configurationBuilder.inMemory(databaseName).build()));
    }
    connectionFactory.setTargetConnectionFactories(factories);
    connectionFactory.setDefaultTargetConnectionFactory(factories.get("default"));
    return connectionFactory;
  }

}

Answer 1

文档Data Types说

TINYINT
Possible values are: -128 to 127.
See also integer literal grammar. Mapped to java.lang.Byte.

所以你应该像这样改变你的 DTO class：

@Table("prep_task")
public class PrepTaskEntity implements Persistable<Long> {

    // .....

    @Column("is_active")
    private Byte isActive;

    // .....

    public boolean isActive() {
        return isActive != null && isActive != 0;
    }

    public void setActive(boolean active) {
        isActive = (byte) (active ? 1 : 0);
    }

    // .....

}

从 H2 数据库读取 TINYINT 值时出现 MappingException boolean/Boolean

Getting MappingException when reading TINYINT value from H2 database as boolean/Boolean

java

h2

spring-boot

spring-webflux

spring-data-r2dbc