我是第一次在PM控制台add-migration ShopDBMigration写的并收到了文件
namespace Shop.Migrations
{
using System;
using System.Data.Entity.Migrations;
public partial class ShopDBMigration : DbMigration
{
public override void Up()
{
CreateTable(
"dbo.CartProduct",
c => new
{
CartID = c.Int(nullable: false, identity: true),
ProductID = c.Int(nullable: false),
UserID = c.Int(),
Cookie = c.String(maxLength: 50),
Count = c.Int(nullable: false),
Date = c.DateTime(nullable: false),
})
.PrimaryKey(t => t.CartID);
CreateTable(
"dbo.Category",
c => new
{
ID = c.Int(nullable: false, identity: true),
CategoryID = c.Int(nullable: false),
Link = c.String(nullable: false, maxLength: 50),
Name = c.String(nullable: false, maxLength: 50),
Description = c.String(nullable: false, maxLength: 500),
Keywords = c.String(nullable: false, maxLength: 200),
ParentID = c.Int(nullable: false),
})
.PrimaryKey(t => t.ID)
.ForeignKey("dbo.Category", t => t.CategoryID)
.Index(t => t.CategoryID);
CreateTable(
"dbo.Product",
c => new
{
ProductID = c.Int(nullable: false, identity: true),
Name = c.String(nullable: false, maxLength: 200),
Description = c.String(nullable: false, maxLength: 400),
Description_Title = c.String(nullable: false, maxLength: 200),
Product_Description = c.String(nullable: false, maxLength: 2000),
Keywords = c.String(nullable: false, maxLength: 200),
Title = c.String(nullable: false, maxLength: 200),
Link = c.String(nullable: false, maxLength: 150),
Count = c.Int(nullable: false),
Price = c.Int(nullable: false),
BarCode = c.String(nullable: false, maxLength: 50),
Image = c.String(nullable: false, maxLength: 200),
Date = c.DateTime(nullable: false),
})
.PrimaryKey(t => t.ProductID);
CreateTable(
"dbo.OrderCustomerInfo",
c => new
{
ID = c.Int(nullable: false, identity: true),
UserID = c.Int(nullable: false),
AllName = c.String(nullable: false, maxLength: 100),
Phone = c.String(nullable: false, maxLength: 12),
Email = c.String(nullable: false, maxLength: 150),
City = c.String(nullable: false, maxLength: 100),
Region = c.String(nullable: false, maxLength: 100),
MailIndex = c.Int(nullable: false),
MailType = c.String(nullable: false, maxLength: 50),
Processed = c.Int(nullable: false),
Additional = c.String(maxLength: 300),
Date = c.DateTime(nullable: false),
})
.PrimaryKey(t => t.ID)
.ForeignKey("dbo.User", t => t.UserID, cascadeDelete: true)
.Index(t => t.UserID);
CreateTable(
"dbo.OrderProduct",
c => new
{
ID = c.Int(nullable: false, identity: true),
ProductID = c.Int(nullable: false),
ProductLink = c.String(nullable: false, maxLength: 150),
ProductName = c.String(nullable: false, maxLength: 200),
Count = c.Int(nullable: false),
TotalPrice = c.Int(nullable: false),
Date = c.DateTime(nullable: false),
OrderCustomer_ID = c.Int(),
})
.PrimaryKey(t => t.ID)
.ForeignKey("dbo.OrderCustomerInfo", t => t.OrderCustomer_ID)
.Index(t => t.OrderCustomer_ID);
CreateTable(
"dbo.ProductPhoto",
c => new
{
ProductID = c.Int(nullable: false),
Image = c.String(nullable: false, maxLength: 200),
Alt = c.String(nullable: false, maxLength: 50),
})
.PrimaryKey(t => new { t.ProductID, t.Image, t.Alt });
CreateTable(
"dbo.User",
c => new
{
UserID = c.Int(nullable: false, identity: true),
UserName = c.String(nullable: false, maxLength: 100),
FirstName = c.String(nullable: false, maxLength: 100),
SecondName = c.String(nullable: false, maxLength: 100),
Email = c.String(nullable: false, maxLength: 100),
Password = c.String(nullable: false, maxLength: 100),
Region = c.String(nullable: false, maxLength: 100),
City = c.String(nullable: false, maxLength: 100),
EmailToken = c.String(nullable: false, maxLength: 20),
AuthenticationToken = c.String(nullable: false, maxLength: 20),
Activated = c.Boolean(nullable: false),
Date = c.DateTime(nullable: false),
})
.PrimaryKey(t => t.UserID);
CreateTable(
"dbo.ProductCategories",
c => new
{
Product_ProductID = c.Int(nullable: false),
Category_ID = c.Int(nullable: false),
})
.PrimaryKey(t => new { t.Product_ProductID, t.Category_ID })
.ForeignKey("dbo.Product", t => t.Product_ProductID, cascadeDelete: true)
.ForeignKey("dbo.Category", t => t.Category_ID, cascadeDelete: true)
.Index(t => t.Product_ProductID)
.Index(t => t.Category_ID);
}
public override void Down()
{
DropForeignKey("dbo.OrderCustomerInfo", "UserID", "dbo.User");
DropForeignKey("dbo.OrderProduct", "OrderCustomer_ID", "dbo.OrderCustomerInfo");
DropForeignKey("dbo.ProductCategories", "Category_ID", "dbo.Category");
DropForeignKey("dbo.ProductCategories", "Product_ProductID", "dbo.Product");
DropForeignKey("dbo.Category", "CategoryID", "dbo.Category");
DropIndex("dbo.ProductCategories", new[] { "Category_ID" });
DropIndex("dbo.ProductCategories", new[] { "Product_ProductID" });
DropIndex("dbo.OrderProduct", new[] { "OrderCustomer_ID" });
DropIndex("dbo.OrderCustomerInfo", new[] { "UserID" });
DropIndex("dbo.Category", new[] { "CategoryID" });
DropTable("dbo.ProductCategories");
DropTable("dbo.User");
DropTable("dbo.ProductPhoto");
DropTable("dbo.OrderProduct");
DropTable("dbo.OrderCustomerInfo");
DropTable("dbo.Product");
DropTable("dbo.Category");
DropTable("dbo.CartProduct");
}
}
}
然后我写了update-database -verbose并收到此错误：
Using StartUp project 'Shop'.
Using NuGet project 'Shop'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'DB_A12B9A_ShopDB' (DataSource: .\LOCALSQL, Provider: System.Data.SqlClient, Origin: Configuration).
Applying explicit migrations: [201701312018367_ShopDBMigration].
Applying explicit migration: 201701312018367_ShopDBMigration.
CREATE TABLE [dbo].[CartProduct] (
[CartID] [int] NOT NULL IDENTITY,
[ProductID] [int] NOT NULL,
[UserID] [int],
[Cookie] [nvarchar](50),
[Count] [int] NOT NULL,
[Date] [datetime] NOT NULL,
CONSTRAINT [PK_dbo.CartProduct] PRIMARY KEY ([CartID])
)
System.Data.SqlClient.SqlException (0x80131904): There is already an object named 'CartProduct' in the database.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.SqlInternalConnection.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, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<NonQuery>b__0(DbCommand t, DbCommandInterceptionContext`1 c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext)
at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery()
at System.Data.Entity.Migrations.DbMigrator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinTransaction(IEnumerable`1 migrationStatements, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinNewTransaction(IEnumerable`1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClass30.<ExecuteStatements>b__2e()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements, DbTransaction existingTransaction)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, VersionedModel targetModel, IEnumerable`1 operations, IEnumerable`1 systemOperations, Boolean downgrading, Boolean auto)
at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
ClientConnectionId:d3c646ad-8f1f-49b1-aef8-b41d89fc1b3c
Error Number:2714,State:6,Class:16
There is already an object named 'CartProduct' in the database.
我还尝试了空白迁移输入命令add-migration ShopDBMigration -IgnoreChanges然后update-database，然后我更改了ShopDBMigration类并传递了命令add-migration ShopDBMigration，它创建了空白文件ShopDBMigration1，忽略了我所做的更改
答案 0 :(得分：0)
我做不到。所以我刚创建了新的数据库，并在设置与实体框架的关系时将数据从一个复制到第二个。