Question

当我尝试将自定义Expenditure对象映射到MySQL中的关系模型时，出现错误：

Initial SessionFactory creation failed.org.hibernate.MappingException: Could not determine type for: javax.money.MonetaryAmount, at table: Expenditure, for columns: [org.hibernate.mapping.Column(monetaryAmount)]

我的支出类别：

@Entity
public class Expenditure implements Comparable<Expenditure> {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    private String description;

    private MonetaryAmount monetaryAmount;

    private LocalDate date;

    private ExpenditureType type;

    @OneToOne
    private User client;
...
}

在这种情况下如何执行映射？

Answer 1

您不能直接映射MonetaryAmount。

您可以尝试将其映射到BigDecimal，然后在代码中执行转换，也可以尝试实现Hibernate自定义类型（尝试搜索{ "IsEncrypted": false, "Values": { "AzureWebJobsStorage": "UseDevelopmentStorage=true", "FUNCTIONS_WORKER_RUNTIME": "dotnet", "SuperSecret": "I love Azure Functions", "EventHubConnectionString": "Endpoint=sb://jeffs.servicebus.windows.net/;SharedAccessKeyName=MyFakeKey;SharedAccessKey=NotARealSecret" } }，或使用JPA转换（如果JPA为2.1或更高版本）。answer在这个主题上有一些不错的链接。

Answer 2

您可以使用jpa'2 @Convert批注：

@Convert(converter = MonetaryAmountConverter.class)
private MonetaryAmount monetaryAmount;

然后像这样实现它：

@Converter
public class MonetaryAmountConverter implements AttributeConverter<MonetaryAmount, BigDecimal> {

    @Override
    public BigDecimal convertToDatabaseColumn(MonetaryAmount attribute) {...}

    @Override
    public MonetaryAmount convertToEntityAttribute(BigDecimal dbData) {...}
}

如何使用Hibernate正确映射MonetaryAmount？

2 个答案: