相关疑难解决方法(0)

我有这个sql:

ALTER TABLE dbo.ChannelPlayerSkins
    DROP CONSTRAINT FK_ChannelPlayerSkins_Channels

但显然,在我们使用的其他一些数据库中,约束具有不同的名称.如何检查名称是否存在约束FK_ChannelPlayerSkins_Channels.

我正在尝试将我的代码第一个ID列从"int"更改为"Guid",并且在尝试运行迁移时,我收到消息:

Identity column 'CustomFieldId' must be of data type int, bigint, smallint, tinyint, or decimal or numeric with a scale of 0, and constrained to be nonnullable.

我正在定义这样的列:

public partial class CustomField : BaseEntity
{

    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public Guid CustomFieldId { get; set; }

在CustomFieldMapping.cs中映射它,如下所示:

public CustomFieldMapping()
{
    //Primary key
    HasKey(t => t.CustomFieldId);

    //Constraints 
    Property(t => t.CustomFieldId).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);

并且生成的迁移正在尝试执行此操作:

public override void Up()
{
    DropForeignKey("dbo.CustomField", "CustomFormId", "dbo.CustomForm");
    DropForeignKey("dbo.CustomData", "CustomFieldId", "dbo.CustomField");
    DropForeignKey("dbo.CustomForm", "ParentFormId", "dbo.CustomForm");
    DropIndex("dbo.CustomField", new[] { "CustomFormId" });
    DropIndex("dbo.CustomForm", new[] { …