Question

在更新当前项目的数据库结构的过程中，我向链接表添加了一个依赖关系，这样关系就是：

JobOffer -< JobApplication >- StaffMember

将此更改添加为新迁移时，添加了其他几个字段＆＃34;迁移Up()和Down()方法。我不再拥有确切的字段，但它们与Skills.JobOffer_ID一致。添加的原因是引用是因为我从未运行update-database，而是删除了这些不必要的字段，然后运行update-database。

更新似乎工作，并添加了正确的字段，但在运行代码时，我收到此错误：

列不在数据库中，但我不知道为什么它们首先被引用，它们从未被创建过，也从未在任何代码中明确写入。

如何防止引用不存在列的这些错误？

修改

目前的模型如下，与上一个模型的唯一变化是将所有者ID添加到JobOpportunity。

当前的迁移如下（减去我删除的字段，确定它们是什么）

public partial class JobChanges : DbMigration
{
    public override void Up()
    {
        AddColumn("dbo.JobOpportunities", "Name", c => c.String());
        AddColumn("dbo.JobOpportunities", "OwnerID", c => c.Int());
        CreateIndex("dbo.JobOpportunities", "OwnerID");
        AddForeignKey("dbo.JobOpportunities", "OwnerID", "dbo.Staff", "ID", cascadeDelete: true);
    }

    public override void Down()
    {
        DropForeignKey("dbo.JobOpportunities", "OwnerID", "dbo.Staff");
        DropIndex("dbo.JobOpportunities", new[] { "OwnerID" });
        DropColumn("dbo.JobOpportunities", "OwnerID");
        DropColumn("dbo.JobOpportunities", "Name");
    }
}

编辑2：

刚刚意识到数据库atm中只存在JobOpportunities，Staff和Skills #facepalm＃

编辑3：

重新修复了错误的迁移，这就是我的开始：

public partial class JobChanges : DbMigration
{
    public override void Up()
    {
        AddColumn("dbo.JobOpportunities", "Name", c => c.String());
        AddColumn("dbo.JobOpportunities", "OwnerID", c => c.Int(nullable: false));
        AddColumn("dbo.JobOpportunities", "Staff_ID", c => c.Int());
        AddColumn("dbo.Skills", "Staff_ID", c => c.Int());
        AddColumn("dbo.Skills", "JobOpportunity_ID", c => c.Int());
        AddColumn("dbo.Skills", "JobOpportunity_ID1", c => c.Int());
        AddColumn("dbo.Staff", "JobOpportunity_ID", c => c.Int());
        CreateIndex("dbo.JobOpportunities", "OwnerID");
        CreateIndex("dbo.JobOpportunities", "Staff_ID");
        CreateIndex("dbo.Staff", "JobOpportunity_ID");
        CreateIndex("dbo.Skills", "Staff_ID");
        CreateIndex("dbo.Skills", "JobOpportunity_ID");
        CreateIndex("dbo.Skills", "JobOpportunity_ID1");
        AddForeignKey("dbo.JobOpportunities", "Staff_ID", "dbo.Staff", "ID");
        AddForeignKey("dbo.Skills", "Staff_ID", "dbo.Staff", "ID");
        AddForeignKey("dbo.Staff", "JobOpportunity_ID", "dbo.JobOpportunities", "ID");
        AddForeignKey("dbo.Skills", "JobOpportunity_ID", "dbo.JobOpportunities", "ID");
        AddForeignKey("dbo.JobOpportunities", "OwnerID", "dbo.Staff", "ID", cascadeDelete: true);
        AddForeignKey("dbo.Skills", "JobOpportunity_ID1", "dbo.JobOpportunities", "ID");
    }

    public override void Down()
    {
        DropForeignKey("dbo.Skills", "JobOpportunity_ID1", "dbo.JobOpportunities");
        DropForeignKey("dbo.JobOpportunities", "OwnerID", "dbo.Staff");
        DropForeignKey("dbo.Skills", "JobOpportunity_ID", "dbo.JobOpportunities");
        DropForeignKey("dbo.Staff", "JobOpportunity_ID", "dbo.JobOpportunities");
        DropForeignKey("dbo.Skills", "Staff_ID", "dbo.Staff");
        DropForeignKey("dbo.JobOpportunities", "Staff_ID", "dbo.Staff");
        DropIndex("dbo.Skills", new[] { "JobOpportunity_ID1" });
        DropIndex("dbo.Skills", new[] { "JobOpportunity_ID" });
        DropIndex("dbo.Skills", new[] { "Staff_ID" });
        DropIndex("dbo.Staff", new[] { "JobOpportunity_ID" });
        DropIndex("dbo.JobOpportunities", new[] { "Staff_ID" });
        DropIndex("dbo.JobOpportunities", new[] { "OwnerID" });
        DropColumn("dbo.Staff", "JobOpportunity_ID");
        DropColumn("dbo.Skills", "JobOpportunity_ID1");
        DropColumn("dbo.Skills", "JobOpportunity_ID");
        DropColumn("dbo.Skills", "Staff_ID");
        DropColumn("dbo.JobOpportunities", "Staff_ID");
        DropColumn("dbo.JobOpportunities", "OwnerID");
        DropColumn("dbo.JobOpportunities", "Name");
    }
}

幻像列：实体框架迁移

0 个答案: