Mongodb 使用scala mongo驱动程序序列化到对象?
我是scala mongo驱动程序的新手,正在尝试了解如何从文档映射类?所有文档似乎都没有说明这是如何实现的。在.net驱动程序中,只需传递泛型并自动映射字段即可。scala中没有类似的东西吗?它们不容易做到。通过深入研究java,我提出了以下解决方案:Mongodb 使用scala mongo驱动程序序列化到对象?,mongodb,scala,Mongodb,Scala,我是scala mongo驱动程序的新手,正在尝试了解如何从文档映射类?所有文档似乎都没有说明这是如何实现的。在.net驱动程序中,只需传递泛型并自动映射字段即可。scala中没有类似的东西吗?它们不容易做到。通过深入研究java,我提出了以下解决方案: import org.bson.codecs.DecoderContext import org.bson.codecs.configuration.CodecRegistries.{fromProviders, fromRegistries}
import org.bson.codecs.DecoderContext
import org.bson.codecs.configuration.CodecRegistries.{fromProviders, fromRegistries}
import org.bson.codecs.configuration.CodecRegistry
import org.bson.{BsonDocumentReader, BsonDocumentWrapper}
import org.mongodb.scala.bson.codecs.{DEFAULT_CODEC_REGISTRY, Macros}
import org.mongodb.scala.bson.collection.mutable.Document
import scala.reflect.classTag
case class Person(firstName: String, lastName: String)
object MongoTest extends App {
val personCodecProvider = Macros.createCodecProvider[Person]()
val codecRegistry: CodecRegistry = fromRegistries(fromProviders(personCodecProvider), DEFAULT_CODEC_REGISTRY)
val document = Document("firstName" -> "first", "lastName" -> "last")
val bsonDocument = BsonDocumentWrapper.asBsonDocument(document, DEFAULT_CODEC_REGISTRY)
val bsonReader = new BsonDocumentReader(bsonDocument)
val decoderContext = DecoderContext.builder.build
val codec = codecRegistry.get(classTag[Person].runtimeClass)
val person: Person = codec.decode(bsonReader, decoderContext).asInstanceOf[Person]
println(s"person: $person")
}
使用mongo宏处理程序序列化和反序列化对象的示例
import reactivemongo.api.bson.{BSON, BSONDocument, Macros}
case class Person(name:String = "SomeName", age:Int = 20)
implicit val personHandler = Macros.handler[Person]
//Serialize
val bsonPerson = BSON.writeDocument[Person](Person())
println(s"${BSONDocument.pretty(bsonPerson.getOrElse(BSONDocument.empty))}")
//Deserialize
val bsonDocumentPerson = BSONDocument("name"-> "MyNameHere", "age"->35)
val scalaObjPerson: Person = BSON.read[Person](bsonDocumentPerson).getOrElse(Person())
printf(s"Scala person obj = $scalaObjPerson")
org.mongodb.scala.bson.codecs.DEFAULT\u CODEC\u注册表
已弃用,请使用import MongoClient.DEFAULT\u CODEC\u注册表
。棒极了,格雷德!