Question

我正在使用EF6读写规则以对SQLite DB进行某些验证。代码优先方法。我成功地将规则写到了DB。在我现在尝试阅读它们时，尽管数据库已正确镜像，但包含子规则的复杂规则似乎具有空的子规则列表。那里怎么了？

类层次结构是：抽象规则-具有“验证”方法的抽象类。 abstract ComplexRule：规则-可以具有子规则的规则 SuperRule，OrRule和AndRule：ComplexRule实现 BasicRule：规则-直接执行，可以进行某些模式匹配。

DB中写出的表是这样的：

 RuleId,Condition,Value,Mode,Discriminator,ComplexRule_RuleId
 1,,,,SuperRule,
 2,*USA*,*PATT1*,1,BasicRule,1
 3,*CHN*,*PATT2*,1,BasicRule,1

读取代码如下：

 using (var db = new RuleModel())
 {
   var q = db.Rules.OfType<SuperRule>).FirstOrDefault();
 }

它产生一个SuperRule，其中子级为空。 db.Rules包含所有3条规则，但是BasicRule和SuperRule之间没有关联。

RuleModel（DbContext）如下：

public class RuleModel : DbContext
{

    public RuleModel() : base("name=RuleModel")
    {
    }

    public virtual DbSet<Rule> Rules { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        var sqliteConnectionInitializer = new SqliteCreateDatabaseIfNotExists<RuleModel>(modelBuilder);
        Database.SetInitializer(sqliteConnectionInitializer);
    }        
}

规则如下：

public abstract class Rule
{
    [Key]
    public int RuleId { get; set; }
    public abstract RuleResult Match(Mapping m);

} 

public abstract class ComplexRule: Rule
{
    public IList<Rule> ChildRules { set; get; }

    public ComplexRule()
    {
        ChildRules = new List<Rule>();
    }
}

public class OrRule : ComplexRule
{
    public override RuleResult Match(Mapping m)
    {
       // Some logics
    }

    public OrRule() : base() { }

}

public class SuperRule: OrRule
{
    public override RuleResult Match(Mapping m)
    {
        //some logics
    }

    public SuperRule() : base()
    {

    }
}

public class BasicRule : Rule
{
    public string Condition { set; get; }

    public string Value { set; get; }

    public RuleMode Mode { set; get; }

    public BasicRule(string condition, string value, RuleMode mode = RuleMode.MODE_ANYWHERE)
    {
        Condition = condition;
        Value = value;
        Mode = mode;
    }
    public BasicRule() { }

    public override RuleResult Match(Mapping m)
    {
        // logics
    }
}

带有SQLite的EF6-不还原列表

0 个答案: