Entity Framework Core 未在我的数据库中创建表

问题描述 投票：0回答：4

我尝试过删除和创建新数据库、删除和创建新迁移，但没有任何效果。

首先，我创建了一个新数据库，然后将连接字符串放入appsettings中，并尝试运行“update-database”。我得到的只是这个：

Executed DbCommand (178ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT OBJECT_ID(N'__EFMigrationsHistory');
Executed DbCommand (4ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT OBJECT_ID(N'__EFMigrationsHistory');
Executed DbCommand (8ms) [Parameters=[], CommandType='Text',    CommandTimeout='30']
SELECT [MigrationId], [ProductVersion]
FROM [__EFMigrationsHistory]
ORDER BY [MigrationId];
Done.

什么也没有被创造。所以，我删除了所有内容并从头开始，然后我得到了这个：

Executed DbCommand (141ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT OBJECT_ID(N'__EFMigrationsHistory');
Executed DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT OBJECT_ID(N'__EFMigrationsHistory');
Executed DbCommand (20ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
SELECT [MigrationId], [ProductVersion]
FROM [__EFMigrationsHistory]
ORDER BY [MigrationId];
Applying migration '20181220145036_test'.
Executed DbCommand (49ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
CREATE TABLE [CartItems] (
    [ID] int NOT NULL IDENTITY,
    [cartID] nvarchar(max),
    [itempicture] nvarchar(max),
    [name] nvarchar(max),
    [price] int NOT NULL,
    [productID] int NOT NULL,
    CONSTRAINT [PK_CartItems] PRIMARY KEY ([ID])
);
System.Data.SqlClient.SqlException: There is already an object named 'CartItems' in the database.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite, String methodName)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.Execute(IRelationalConnection connection, String executeMethod, IReadOnlyDictionary`2 parameterValues, Boolean closeConnection)
   at Microsoft.EntityFrameworkCore.Storage.Internal.RelationalCommand.ExecuteNonQuery(IRelationalConnection connection, IReadOnlyDictionary`2 parameterValues)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.MigrationCommandExecutor.ExecuteNonQuery(IEnumerable`1 migrationCommands, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration)
   at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration, String contextType)
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayClass0_1.<.ctor>b__0()
   at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
ClientConnectionId:2170e7ba-871f-416a-88c9-bfb2bf586d3d
Error Number:2714,State:6,Class:16
There is already an object named 'CartItems' in the database.

我知道这是错误的，因为它是一个全新的空数据库。我的一些代码：

应用程序DbContext：

public class ApplicationDbContextFactory : IDbContextFactory<ApplicationDbContext>
{
    public ApplicationDbContext Create(DbContextFactoryOptions options)
    {
        var optionsBuilder = new DbContextOptionsBuilder<ApplicationDbContext>();

        return new ApplicationDbContext(optionsBuilder.Options);
    }
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
    {
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            IConfigurationRoot configuration = new ConfigurationBuilder()
                 .SetBasePath(Directory.GetCurrentDirectory())
                 .AddJsonFile("appsettings.json")
                 .Build();

            var connectionString = configuration.GetConnectionString("DefaultConnection");

            optionsBuilder.UseSqlServer(connectionString);
        }
    }

    //protected override void OnModelCreating(ModelBuilder builder)
    //{
    //    base.OnModelCreating(builder);
    //    // Customize the ASP.NET Identity model and override the defaults if needed.
    //    // For example, you can rename the ASP.NET Identity table names and more.
    //    // Add your customizations after calling base.OnModelCreating(builder);
    //}

    public DbSet<Product> Products { get; set; }
    public DbSet<Order> Orders { get; set; }
    public DbSet<CartItems> CartItems { get; set; }
    public DbSet<OrderDetails> OrderDetails { get; set; }
}

购物车商品：

public class CartItems
{
    public int ID { get; set; }
    public string cartID { get; set; }
    public string name { get; set; }
    public int price { get; set; }
    public string itempicture { get; set; }
    public int productID { get; set; }
}

我过去已经能够使用相同的代码和应用程序创建表。我目前也在其他项目中以相同的方式使用 EFCore，没有任何问题。因此，我非常感谢您提供帮助以使其重新恢复正常工作。我想知道将来该怎么办。

编辑：连接字符串：

"DefaultConnection": "Data Source=CHRISTOPHER09E8;Initial Catalog=LNCTest;Integrated Security=True"

编辑2：迁移：

namespace LNCLibrary.Migrations
{
    public partial class Initialv1 : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "CartItems",
                columns: table => new
                {
                    ID = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    cartID = table.Column<string>(nullable: true),
                    itempicture = table.Column<string>(nullable: true),
                    name = table.Column<string>(nullable: true),
                    price = table.Column<int>(nullable: false),
                    productID = table.Column<int>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_CartItems", x => x.ID);
                });

            migrationBuilder.CreateTable(
                name: "Products",
                columns: table => new
                {
                    ID = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    Category = table.Column<int>(nullable: false),
                    DateCreated = table.Column<DateTime>(nullable: false),
                    GenderOption = table.Column<int>(nullable: false),
                    Price = table.Column<int>(nullable: false),
                    ProductDescription = table.Column<string>(nullable: true),
                    ProductName = table.Column<string>(nullable: true),
                    ProfilePicture = table.Column<string>(nullable: true),
                    Quantity = table.Column<int>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Products", x => x.ID);
                });

            migrationBuilder.CreateTable(
                name: "AspNetUsers",
                columns: table => new
                {
                    Id = table.Column<string>(nullable: false),
                    AccessFailedCount = table.Column<int>(nullable: false),
                    Address = table.Column<string>(nullable: true),
                    CheckoutComments = table.Column<string>(nullable: true),
                    City = table.Column<string>(nullable: true),
                    ConcurrencyStamp = table.Column<string>(nullable: true),
                    Email = table.Column<string>(maxLength: 256, nullable: true),
                    EmailConfirmed = table.Column<bool>(nullable: false),
                    FirstName = table.Column<string>(nullable: true),
                    LastName = table.Column<string>(nullable: true),
                    LockoutEnabled = table.Column<bool>(nullable: false),
                    LockoutEnd = table.Column<DateTimeOffset>(nullable: true),
                    NormalizedEmail = table.Column<string>(maxLength: 256, nullable: true),
                    NormalizedUserName = table.Column<string>(maxLength: 256, nullable: true),
                    PasswordHash = table.Column<string>(nullable: true),
                    PhoneNumber = table.Column<string>(nullable: true),
                    PhoneNumberConfirmed = table.Column<bool>(nullable: false),
                    SecurityStamp = table.Column<string>(nullable: true),
                    State = table.Column<int>(nullable: false),
                    TwoFactorEnabled = table.Column<bool>(nullable: false),
                    UserName = table.Column<string>(maxLength: 256, nullable: true),
                    ZipCode = table.Column<int>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetUsers", x => x.Id);
                });

            migrationBuilder.CreateTable(
                name: "AspNetRoles",
                columns: table => new
                {
                    Id = table.Column<string>(nullable: false),
                    ConcurrencyStamp = table.Column<string>(nullable: true),
                    Name = table.Column<string>(maxLength: 256, nullable: true),
                    NormalizedName = table.Column<string>(maxLength: 256, nullable: true)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetRoles", x => x.Id);
                });

            migrationBuilder.CreateTable(
                name: "AspNetUserTokens",
                columns: table => new
                {
                    UserId = table.Column<string>(nullable: false),
                    LoginProvider = table.Column<string>(nullable: false),
                    Name = table.Column<string>(nullable: false),
                    Value = table.Column<string>(nullable: true)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetUserTokens", x => new { x.UserId, x.LoginProvider, x.Name });
                });

            migrationBuilder.CreateTable(
                name: "Size",
                columns: table => new
                {
                    ID = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    ProductID = table.Column<int>(nullable: true),
                    ThisSize = table.Column<int>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Size", x => x.ID);
                    table.ForeignKey(
                        name: "FK_Size_Products_ProductID",
                        column: x => x.ProductID,
                        principalTable: "Products",
                        principalColumn: "ID",
                        onDelete: ReferentialAction.Restrict);
                });

            migrationBuilder.CreateTable(
                name: "Orders",
                columns: table => new
                {
                    ID = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    Address = table.Column<string>(nullable: true),
                    CartID = table.Column<string>(nullable: true),
                    CheckoutComments = table.Column<string>(nullable: true),
                    City = table.Column<string>(nullable: true),
                    ConfirmationNumber = table.Column<string>(nullable: true),
                    DateOfPurchase = table.Column<DateTime>(nullable: false),
                    Email = table.Column<string>(nullable: true),
                    FinalPrice = table.Column<float>(nullable: false),
                    FirstName = table.Column<string>(nullable: true),
                    LastName = table.Column<string>(nullable: true),
                    PaymentMethod = table.Column<int>(nullable: false),
                    RegularCustomerId = table.Column<string>(nullable: true),
                    State = table.Column<int>(nullable: false),
                    Status = table.Column<int>(nullable: false),
                    ZipCode = table.Column<int>(nullable: false),
                    isGuest = table.Column<bool>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Orders", x => x.ID);
                    table.ForeignKey(
                        name: "FK_Orders_AspNetUsers_RegularCustomerId",
                        column: x => x.RegularCustomerId,
                        principalTable: "AspNetUsers",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Restrict);
                });

            migrationBuilder.CreateTable(
                name: "AspNetUserClaims",
                columns: table => new
                {
                    Id = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    ClaimType = table.Column<string>(nullable: true),
                    ClaimValue = table.Column<string>(nullable: true),
                    UserId = table.Column<string>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetUserClaims", x => x.Id);
                    table.ForeignKey(
                        name: "FK_AspNetUserClaims_AspNetUsers_UserId",
                        column: x => x.UserId,
                        principalTable: "AspNetUsers",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateTable(
                name: "AspNetUserLogins",
                columns: table => new
                {
                    LoginProvider = table.Column<string>(nullable: false),
                    ProviderKey = table.Column<string>(nullable: false),
                    ProviderDisplayName = table.Column<string>(nullable: true),
                    UserId = table.Column<string>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetUserLogins", x => new { x.LoginProvider, x.ProviderKey });
                    table.ForeignKey(
                        name: "FK_AspNetUserLogins_AspNetUsers_UserId",
                        column: x => x.UserId,
                        principalTable: "AspNetUsers",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateTable(
                name: "AspNetRoleClaims",
                columns: table => new
                {
                    Id = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    ClaimType = table.Column<string>(nullable: true),
                    ClaimValue = table.Column<string>(nullable: true),
                    RoleId = table.Column<string>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetRoleClaims", x => x.Id);
                    table.ForeignKey(
                        name: "FK_AspNetRoleClaims_AspNetRoles_RoleId",
                        column: x => x.RoleId,
                        principalTable: "AspNetRoles",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateTable(
                name: "AspNetUserRoles",
                columns: table => new
                {
                    UserId = table.Column<string>(nullable: false),
                    RoleId = table.Column<string>(nullable: false)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_AspNetUserRoles", x => new { x.UserId, x.RoleId });
                    table.ForeignKey(
                        name: "FK_AspNetUserRoles_AspNetRoles_RoleId",
                        column: x => x.RoleId,
                        principalTable: "AspNetRoles",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Cascade);
                    table.ForeignKey(
                        name: "FK_AspNetUserRoles_AspNetUsers_UserId",
                        column: x => x.UserId,
                        principalTable: "AspNetUsers",
                        principalColumn: "Id",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateTable(
                name: "OrderDetails",
                columns: table => new
                {
                    ID = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn),
                    CartID = table.Column<string>(nullable: true),
                    Name = table.Column<string>(nullable: true),
                    OrderID = table.Column<int>(nullable: false),
                    price = table.Column<int>(nullable: false),
                    productpicture = table.Column<string>(nullable: true)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_OrderDetails", x => x.ID);
                    table.ForeignKey(
                        name: "FK_OrderDetails_Orders_OrderID",
                        column: x => x.OrderID,
                        principalTable: "Orders",
                        principalColumn: "ID",
                        onDelete: ReferentialAction.Cascade);
                });

            migrationBuilder.CreateIndex(
                name: "IX_Orders_RegularCustomerId",
                table: "Orders",
                column: "RegularCustomerId");

            migrationBuilder.CreateIndex(
                name: "IX_OrderDetails_OrderID",
                table: "OrderDetails",
                column: "OrderID");

            migrationBuilder.CreateIndex(
                name: "IX_Size_ProductID",
                table: "Size",
                column: "ProductID");

            migrationBuilder.CreateIndex(
                name: "EmailIndex",
                table: "AspNetUsers",
                column: "NormalizedEmail");

            migrationBuilder.CreateIndex(
                name: "UserNameIndex",
                table: "AspNetUsers",
                column: "NormalizedUserName",
                unique: true);

            migrationBuilder.CreateIndex(
                name: "RoleNameIndex",
                table: "AspNetRoles",
                column: "NormalizedName",
                unique: true);

            migrationBuilder.CreateIndex(
                name: "IX_AspNetRoleClaims_RoleId",
                table: "AspNetRoleClaims",
                column: "RoleId");

            migrationBuilder.CreateIndex(
                name: "IX_AspNetUserClaims_UserId",
                table: "AspNetUserClaims",
                column: "UserId");

            migrationBuilder.CreateIndex(
                name: "IX_AspNetUserLogins_UserId",
                table: "AspNetUserLogins",
                column: "UserId");

            migrationBuilder.CreateIndex(
                name: "IX_AspNetUserRoles_RoleId",
                table: "AspNetUserRoles",
                column: "RoleId");
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "CartItems");

            migrationBuilder.DropTable(
                name: "OrderDetails");

            migrationBuilder.DropTable(
                name: "Size");

            migrationBuilder.DropTable(
                name: "AspNetRoleClaims");

            migrationBuilder.DropTable(
                name: "AspNetUserClaims");

            migrationBuilder.DropTable(
                name: "AspNetUserLogins");

            migrationBuilder.DropTable(
                name: "AspNetUserRoles");

            migrationBuilder.DropTable(
                name: "AspNetUserTokens");

            migrationBuilder.DropTable(
                name: "Orders");

            migrationBuilder.DropTable(
                name: "Products");

            migrationBuilder.DropTable(
                name: "AspNetRoles");

            migrationBuilder.DropTable(
                name: "AspNetUsers");
        }
    }
}
c# sql-server entity-framework-core asp.net-core-2.0 entity-framework-migrations
4个回答
1
投票

终于弄清楚了，感谢Reddit上的u/The_MAZZTer。因此，由于某种原因，我的 

OnConfiguration
中的 
ApplicationDbContext
方法中的配置生成器在我的 
appsettings.json
中找不到连接字符串。那里出了问题。我将连接字符串硬编码到该方法中，并将迁移推送到我的数据库，没有任何问题。所以现在我需要弄清楚是否有一种方法可以使用这种方法，或者有一种方法可以找出为什么它没有拉动正确的弦。尽管如此，我现在有了一种迁移的方式，这对我来说现在很重要。感谢其他人的帮助。

0
投票

您无需手动创建数据库。更新数据库命令可以完成所有操作。

0
投票

我遇到了同样的问题，除了连接字符串之外一切都很好。但构建进展顺利，所以我一开始就没有看它。

这是我的连接字符串在 

appsettings.json
中的结尾，因为我的 MS SQL 服务器在特定端口上工作：

 "AuthDbContextConnection": "Data Source=xxx.xxx.xxx.xxx,10008;Initial Catalog=dbName;Persist Security Info=True;User ID=sqluser;Password=sqlpassword"
这里是

xxx.xxx.xxx.xxx
而不是IP地址。

向现有 ASP.NET MVC Core 3.x 项目添加身份的完整步骤

我按照 this MS 教程将身份添加到 ASP.NET MVC Core 3.x 项目，我遇到了一些像你一样的问题，所以我在这里展示它们是如何解决的。

我无法安装

Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore
，所以我进入数据包页面here并为我的项目安装了最新版本（.NET Core 3.x），即this。所以我安装了软件包：

Install-Package Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore -Version 3.1.10

之后我就跑步

Add-Migration CreateIdentitySchema -Context AuthDbContext

如果没有上下文参数，它就不起作用。 这创建了我分别运行的 2 个迁移：

Update-Database 20201217102436_InitialCreate -Context AuthDbContext

并且比

 Update-Database 20201218083037_CreateIdentitySchema -Context AuthDbContext

这很有效。表已在 MS SQL Server 中成功创建。

0
投票

谢谢，伙计，它对我有用......!!!

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