[英]Hibernate & JPA 2.1 - mapping java.time.LocalDateTime as key in java.util.Map
从域模型类给出以下枚举:
public enum OperationMode {
BATTERY_CHANGE_MODE,
PBP_MODE
}
我还定义了一个AttributeConverter来在LocalDateTime和TimeStamp之间转换
@Converter
public class LocalDateTimeAttributeConverter implements AttributeConverter<LocalDateTime, Timestamp> {
@Override
public Timestamp convertToDatabaseColumn(LocalDateTime locDateTime) {
return (locDateTime == null ? null : Timestamp.valueOf(locDateTime));
}
@Override
public LocalDateTime convertToEntityAttribute(Timestamp sqlTimestamp) {
return (sqlTimestamp == null ? null : sqlTimestamp.toLocalDateTime());
}
}
在Entity类中,我需要为java.utitl.Map定义一个有效的映射作为元素集合:
@ElementCollection
@MapKeyColumn(name = "time")
@Convert(converter = LocalDateTimeAttributeConverter.class)
// some annotations are missing here...
private Map<LocalDateTime, OperationMode> operationHistory;
建议使用什么方法使它正常工作?
解决方案是以下映射:
@ElementCollection
@MapKeyColumn(name = "time")
@Convert(converter = LocalDateTimeAttributeConverter.class, attributeName = "key")
@Enumerated(EnumType.STRING)
private Map<LocalDateTime, OperationMode> operationHistory;
缺少attributeName'key ' 。
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