Hibernate映射异常无法确定以下类型:java.nio.file.Path

问题描述

我有一个实体照片，如下所示

I have an entity Photo as below

@Entity
class Photo {

Path imagePath;

public Path getImagePath(){
return imagePath;
// setter
}

在这个实体中，我必须nio.Path我该如何解决这个问题或使db中的表接受字符串作为路径错误堆栈位于

In this entity i have to nio.Path how can i solve thiss problem or make the table in db to accept strings as paththe error stack is below

Caused by: org.hibernate.MappingException: Could not determine type for: java.nio.file.Path, at table: photo, for columns: [org.hibernate.mapping.Column(image_path)]
    at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:431)

推荐答案

您可以使用AttributeConverter.

import java.nio.file.Path;
import java.nio.file.Paths;
import javax.persistence.AttributeConverter;
import javax.persistence.Converter;

@Converter // may want to set autoApply to true
public class PathConverter implements AttributeConverter<Path, String> {

    @Override
    public String convertToDatabaseColumn(Path attribute) {
        return attribute == null ? null : attribute.toString();
    }

    @Override
    public Path convertToEntityAttribute(String dbData) {
        return dbData == null ? null : Paths.get(dbData);
    }

}

此转换器示例将仅存储Path的路径部分.它不会保留任何其他信息，例如它属于什么FileSystem(并且在从String转换为Path时将采用默认的FileSystem).

This converter example will only store the path part of the Path. It won't maintain any other information such as what FileSystem it belongs to (and will assume the default FileSystem when converting from String to Path).

import java.nio.file.Path;
import javax.persistence.Convert;
import javax.persistence.Entity;

@Entity
public class Photo {

    @Convert(converter = PathConverter.class) // needed if autoApply isn't true
    private Path imagePath;

}

有关更多信息，请参见以下文档:

See the documentation of the following for more information:

• AttributeConverter
• Converter
• Convert

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