Question

我有以下课程：

var objects = {}; 

objects.first = function(){
  console.log("First one is executed");
}

objects.second = function(){
    console.log("second one is executed");

}

objects.third = function(){
    console.log("third one is executed");
}

当我有一个A实例，子实例为B时，执行class A { [PrimaryKey] public int A_ID { get; set; } [OneToMany(CascadeOperations=CascadeOperation.All)] public List<B> Children { get; set; } } class B { [PrimaryKey] public int B_ID { get; set; } [ForeignKey(typeof(C))] public int C_ID { get; set; } } class C { [PrimaryKey] public int C_ID { get; set; } } 确实会导致A和它的子B被插入到数据库中，但是每个外键值db.InsertOrReplaceWithChildren(aInstance, recursive: true);始终是默认值0，尽管它们具有值。

示例：

B.C_ID

当我选择记录B时：

A aInstance = new A();
aInstance.A_ID = 1;

B bInstance = new B();
bInstance.B_ID = 1;

C cInstance = new C();
cInstance.C_ID = 1;

bInstance.C_ID = cInstance.C_ID; //assigning the many-to-one foreign key of B to C
aInstance.Children.Add(bInstance); //assigning the one-to-many child record of A to B

//do the insert
db.InsertOrReplaceWithChildren(aInstance, recursive:true);

Answer 1

我遇到了这个问题，它是通过在B类中识别C类对象（作为外键对象）并将关系标记为ReadOnly = true来解决的。所以代码应该是

class A
{
    [PrimaryKey]
    public int A_ID { get; set; }

    [OneToMany(CascadeOperations=CascadeOperation.All)]
    public List<B> Children { get; set; }
}

class B
{
    [PrimaryKey]
    public int B_ID { get; set; }

    [OneToOne(ReadOnly=true)]
    public C C_Obj { get; set; }

    [ForeignKey(typeof(C))]
    public int C_ID { get; set; }
}

class C
{
    [PrimaryKey]
    public int C_ID { get; set; }
}

我希望这个解决方案适合你:)

sqlite net扩展InsertOrReplaceWithChildren不插入子外键字段

1 个答案: