实体框架迁移 - 支持动态连接字符串

Question

我无法使迁移适用于特定方案.

我们的应用使用两种不同的型号 第一个是主数据库,在那里,迁移工作正常.第二个模型是针对我们的客户数据库,这些数据库是针对每个客户的(当然......),但都共享相同的模型.

因此,在应用程序(ASP.Net MVC 3)中,我们使用路线识别客户,并且所有客户都托管在同一个应用程序中.因此,对于每个请求,我们将密钥传递给我们的客户模型dbContext构造函数,并使用该密钥通过简单的帮助方法恢复连接字符串.

应用程序工作正常但不是迁移,因为我发现无法在程序包管理器控制台中传递密钥.

我试图创建自己的IDbConnectionFactory,但没有考虑到它.

如果我尝试连接工厂我收到以下错误,因为没有键被通过,但我可以看到我的连接工厂中(EFCustomerModel.EFConnectionFactory)踢这是正常的更新的数据库命令:

PM> update-database  -verbose
Using NuGet project 'EFCustomerModel'.
Using StartUp project 'PMEL.DatabaseSetup'.
System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.
   at System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue)
   at System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey)
   at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules)
   at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
   at System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value)
   at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
   at System.Data.SqlClient.SqlConnection..ctor(String connectionString)
   **at EFCustomerModel.EFConnectionFactory.CreateConnection(String nameOrConnectionString) in C:\...\EFCustomerModel\EFConnectionFactory.vb:line 18**
   at System.Data.Entity.Internal.LazyInternalConnection.Initialize()
   at System.Data.Entity.Internal.LazyInternalConnection.get_Connection()
   at System.Data.Entity.Internal.LazyInternalContext.get_Connection()
   at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType, DbProviderInfo modelProviderInfo, AppConfig config, DbConnectionInfo connectionInfo)
   at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType)
   at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext)
   at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration)
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
   at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
Format of the initialization string does not conform to specification starting at index 0.

但是当我尝试使用-Co​​nnectionString参数传入我的密钥时,我的连接工厂被忽略,我得到同样的错误:

PM> update-database  -verbose -ConnectionString:CC99999 -ConnectionProviderName:System.Data.SqlClient
Using NuGet project 'EFCustomerModel'.
Using StartUp project 'PMEL.DatabaseSetup'.
System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.
   at System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyvalue)
   at System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey)
   at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules)
   at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
   at System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value)
   at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
   at System.Data.Entity.Internal.LazyInternalConnection.InitializeFromConnectionStringSetting(ConnectionStringSettings appConfigConnection)
   at System.Data.Entity.Internal.LazyInternalConnection.Initialize()
   at System.Data.Entity.Internal.LazyInternalConnection.get_Connection()
   at System.Data.Entity.Internal.LazyInternalContext.get_Connection()
   at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType, DbProviderInfo modelProviderInfo, AppConfig config, DbConnectionInfo connectionInfo)
   at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType, DbConnectionInfo connectionInfo)
   at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext)
   at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration)
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
   at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
Format of the initialization string does not conform to specification starting at index 0.

那么,这是迁移中不受支持的情况,还是有另一种传递密钥的方法,或者有另一种方法来生成我的连接字符串？

谢谢,

Answer 1

您应该能够使用参数将密钥传递给自定义连接工厂-ConnectionStringName。该参数将被传递给该CreateConnection方法。

另一种可能的解决方案是从代码中调用数据库迁移：

var configuration = new Configuration();
configuration.TargetDatabase = new DbConnectionInfo(
    "Server=MyServer;Database=MyDatabase;Trusted_Connection=True;", 
    "System.Data.SqlClient");

var migrator = new DbMigrator(configuration);
migrator.Update();