Question

我在迁移数据库时遇到问题。只是说 - 我是新手所以请不要非常认真地评判我。这是我的两个表（模型），它们应该是一对一或零关系：

<Table("User")>
Partial Public Class User
    <Key>
    Public Property UserId As Integer

    <StringLength(50)>
    Public Property FirstName As String

    <StringLength(50)>
    Public Property LastName As String

    <StringLength(50)>
    Public Property Username As String

    <StringLength(50)>
    Public Property Password As String

    Public Property Email As String
    Public Property Age As Integer
    Public Overridable Property User_Wallet As User_Wallet      
End Class

<Table("User_Wallet")>
Public Class User_Wallet
    <Key, ForeignKey("User")>
    Public Property UserId As Integer
    <DataType(DataType.Currency)>
    Public Property WalletBalance As Decimal
    Public Overridable Property User As User
End Class

当我尝试应用以下迁移时：

Namespace Migrations
    Public Partial Class _4
        Inherits DbMigration

        Public Overrides Sub Up()
            DropForeignKey("dbo.User_WalletUser", "User_Wallet_WalletId", "dbo.User_Wallet")
            DropForeignKey("dbo.User_WalletUser", "User_UserId", "dbo.User")
            DropIndex("dbo.User_WalletUser", New String() { "User_Wallet_WalletId" })
            DropIndex("dbo.User_WalletUser", New String() { "User_UserId" })
            DropPrimaryKey("dbo.User_Wallet")
            DropColumn("dbo.User_Wallet", "WalletId")
            DropTable("dbo.User_WalletUser")
            AddPrimaryKey("dbo.User_Wallet", "UserId")
            CreateIndex("dbo.User_Wallet", "UserId")
            AddForeignKey("dbo.User_Wallet", "UserId", "dbo.User", "UserId")
            'DropColumn("dbo.User_Wallet", "WalletId")
            'DropTable("dbo.User_WalletUser")
        End Sub

        Public Overrides Sub Down()
            CreateTable(
                "dbo.User_WalletUser",
                Function(c) New With
                    {
                        .User_Wallet_WalletId = c.Int(nullable := False),
                        .User_UserId = c.Int(nullable := False)
                    }) _
                .PrimaryKey(Function(t) New With { t.User_Wallet_WalletId, t.User_UserId })

            AddColumn("dbo.User_Wallet", "WalletId", Function(c) c.Int(nullable := False, identity := True))
            DropForeignKey("dbo.User_Wallet", "UserId", "dbo.User")
            DropIndex("dbo.User_Wallet", New String() { "UserId" })
            DropPrimaryKey("dbo.User_Wallet")
            AddPrimaryKey("dbo.User_Wallet", "WalletId")
            CreateIndex("dbo.User_WalletUser", "User_UserId")
            CreateIndex("dbo.User_WalletUser", "User_Wallet_WalletId")
            AddForeignKey("dbo.User_WalletUser", "User_UserId", "dbo.User", "UserId", cascadeDelete := True)
            AddForeignKey("dbo.User_WalletUser", "User_Wallet_WalletId", "dbo.User_Wallet", "WalletId", cascadeDelete := True)
        End Sub
    End Class
End Namespace

我在PackageManager控制台中收到此错误：

**指CREATE UNIQUE INDEX语句因重复键

而终止

找到对象名称'dbo.User_Wallet'和索引名称的
'PK_dbo.User_Wallet'。重复键值为（0）。无法创建约束或索引。查看以前的错误。声明一直如此终止。**

我的表格首先是我尝试应用迁移的一些数据，当谷歌搜索一下并在这里阅读一些帖子时，我删除了所有数据 - 现在表格都是空的，但我仍然得到同样的错误。任何人都可以给我一个方向，我的错误是什么？

实体框架 - 代码优先迁移 - 找到重复密钥

0 个答案: