LitePal一对一、多对一、多对多

本文主要是介绍LitePal一对一、多对一、多对多，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

参考：https://www.jianshu.com/p/bc68e763c7a2

一对一

一个boy对应一个girl,相应地一个girl对应一个boy

Boy类:

    public class Boy extends DataSupport {private int id;private Girl girl;private String name;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public Girl getGirl() {return girl;}public void setGirl(Girl girl) {this.girl = girl;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic String toString() {return "Boy{" +"id=" + id +", girl=" + girl +", name='" + name + '\'' +", age=" + age +'}';}
}

Girl类

public class Girl extends DataSupport {
private int id;
private Boy boy;
private int age;
private String name;public Boy getBoy() {return boy;
}public void setBoy(Boy boy) {this.boy = boy;
}public int getAge() {return age;
}public void setAge(int age) {this.age = age;
}public String getName() {return name;
}public void setName(String name) {this.name = name;
}public int getId() {return id;
}public void setId(int id) {this.id = id;
}@Override
public String toString() {return "Girl{" +"id=" + id +", boy=

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