如何在JPA中使用Postgres JSONB数据类型?
我没有找到使用JPA(EclipseLink)从PostgreSQL映射JSON和JSONB数据类型的方法。是否有人将这种数据类型与JPA结合使用,可以给我一些工作示例吗?
回答:
所有的答案都帮助我达成了最终的解决方案,该解决方案可以用于JPA,而不是专门用于EclipseLink或Hibernate。
import com.fasterxml.jackson.core.type.TypeReference;import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import javax.json.Json;
import javax.json.JsonObject;
import javax.persistence.Converter;
import org.postgresql.util.PGobject;
@Converter(autoApply = true)
public class JsonConverter implements javax.persistence.AttributeConverter<JsonObject, Object> {
private static final long serialVersionUID = 1L;
private static ObjectMapper mapper = new ObjectMapper();
@Override
public Object convertToDatabaseColumn(JsonObject objectValue) {
try {
PGobject out = new PGobject();
out.setType("json");
out.setValue(objectValue.toString());
return out;
} catch (Exception e) {
throw new IllegalArgumentException("Unable to serialize to json field ", e);
}
}
@Override
public JsonObject convertToEntityAttribute(Object dataValue) {
try {
if (dataValue instanceof PGobject && ((PGobject) dataValue).getType().equals("json")) {
return mapper.reader(new TypeReference<JsonObject>() {
}).readValue(((PGobject) dataValue).getValue());
}
return Json.createObjectBuilder().build();
} catch (IOException e) {
throw new IllegalArgumentException("Unable to deserialize to json field ", e);
}
}
}
以上是 如何在JPA中使用Postgres JSONB数据类型? 的全部内容, 来源链接: utcz.com/qa/426745.html