二：ORM框架Morphia的學習-Entity和Embedded的簡單使用

首先，搭好你的環境。配好你的包。

需要的jars包有：mongo-java-driver-2.xx.jar , morphia-0.xx.jar

假設我們有兩個類，hotel和address

public class Hotel {

    private String name;
    private int stars;
    private Address address;

    // ... getters and setters
}

和

public class Address {

    private String street;
    private String city;
    private String postCode;
    private String country;

    // ... getters and setters
}

和我們想保存實例到mongodb，那麼我們要添加morphia的註釋@，直接上代碼：

import com.google.code.morphia.annotations.Entity;
import com.google.code.morphia.annotations.Embedded;
import com.google.code.morphia.annotations.Id;
import com.google.code.morphia.annotations.Property;
import org.bson.types.ObjectId;

@Entity
public class Hotel {

    @Id private ObjectId id;

    private String name;
    private int stars;

    @Embedded
    private Address address;

    // ... getters and setters
}

和

import com.google.code.morphia.annotations.Embedded;

@Embedded
public class Address {

    private String street;
    private String city;
    private String postCode;
    private String country;

    // ... getters and setters
}

我們在hotel前加了@Entity，也在address前加了@Embedded。