我在更新数据库时遇到问题,当我应用迁移时出现此错误:
The object 'PK_dbo.CostCenter' is dependent on column 'Id'.
ALTER TABLE DROP COLUMN Id failed because one or more objects access this column.
我只是尝试向此表添加虚拟属性 (CostCenter),以便能够获取该数据
[Table("Department")]
public class Department
{
public int Id { get; set; }
public string Code { get; set; }
public virtual IList<Cost> Costs_Department { get; set; }
public virtual CostCenter CostCenter { get; set; }
}
这是 CostCenter 表
[Table("CostCenter")]
public class CostCenter
{
public int Id { get; set; }
public string Code { get; set; }
[Required]
public virtual Department Department { get; set; }
}
还有另一个与部门相关的表
[Table("Cost")]
public class Cost
{
public int Id { get; set; }
...
public virtual Department Departament { get; set; }
public virtual Material Material { get; set; }
}
我添加的唯一更改是 Department 表上的 CostCenter 属性,这是 VS 在迁移文件上创建的内容
public partial class CC : DbMigration
{
public override void Up()
{
DropForeignKey("dbo.CostCenter", "Department_CostCenter_Id", "dbo.Department");
DropIndex("dbo.CostCenter", new[] { "Department_CostCenter_Id" });
DropColumn("dbo.CostCenter", "Id");
RenameColumn(table: "dbo.CostCenter", name: "Department_CostCenter_Id", newName: "Id");
DropPrimaryKey("dbo.CostCenter");
AlterColumn("dbo.CostCenter", "Id", c => c.Int(nullable: false));
AddPrimaryKey("dbo.CostCenter", "Id");
CreateIndex("dbo.CostCenter", "Id");
AddForeignKey("dbo.CostCenter", "Id", "dbo.Department", "Id");
}
public override void Down()
{
DropForeignKey("dbo.CostCenter", "Id", "dbo.Department");
DropIndex("dbo.CostCenter", new[] { "Id" });
DropPrimaryKey("dbo.CostCenter");
AlterColumn("dbo.CostCenter", "Id", c => c.Int(nullable: false, identity: true));
AddPrimaryKey("dbo.CostCenter", "Id");
RenameColumn(table: "dbo.CostCenter", name: "Id", newName: "Department_CostCenter_Id");
AddColumn("dbo.CostCenter", "Id", c => c.Int(nullable: false, identity: true));
CreateIndex("dbo.CostCenter", "Department_CostCenter_Id");
AddForeignKey("dbo.CostCenter", "Department_CostCenter_Id", "dbo.Department", "Id", cascadeDelete: true);
}
}
我在其他表上已经有类似的关系,所以我不知道这次是什么导致了问题
最佳答案
我遇到了类似的问题,只需删除所有以前的迁移文件,创建一个新文件并执行 update-database 命令。如果可以的话,也删除之前的数据库。
关于sql-server - EF Code-First 迁移 ALTER TABLE DROP COLUMN Id 失败,因为一个或多个对象访问此列,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31507193/