Bir indeks oluşturmak ve sorguyu hızlandırmak istiyorsanız, özniteliğe [Index] özniteliğini ekleyin ve kodu otomatik olarak aşağıdaki gibi oluşturun:
Veritabanını güncelliyoruz ve hata şu şekildedir:
System.Data.SqlClient.SqlException (0x80131904): tablo 'dbo. 'Hesap'daki 'Telefon' sütunu bir indekste anahtar sütun olarak kullanılamaz.
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)
In 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)
In System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource'1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
In System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher içinde. <NonQuery>b__0(DbCommand t, DbCommandInterceptionContext'1 c)
In System.Data.Entity.Infrastructure.Interception.InternalDispatcher'1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func'3 operation, TInterceptionContext interceptionContext, Action'3 yürütülüyor, Action'3 yürütülüyor)
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand komutu, DbCommandInterceptionContext interceptionContext) içinde
System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() içinde
System.Data.Entity.Migrations.DbMigrator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext içinde interceptionContext)
System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction , DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable'1 migrationStatements, DbConnection connection, DbTransaction transaction) içinde, DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinTransaction(IEnumerable'1 migrationStatements, DbTransaction transaction, DbInterceptionContext içinde interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinNewTransaction(IEnumerable'1 migrationStatements, DbConnection connection, DbInterceptionContext içinde interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal içinde (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__DisplayClass32. <ExecuteStatements>b__30()
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1 içinde. <Execute>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func'1 operation)
In System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable'1 migrationStatements, DbTransaction existingTransaction) içinde
System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable'1 migrationStatements) içinde
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable'1 migrationStatements)
System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, VersionedModel targetModel, IEnumerable'1 operations, IEnumerable'1 systemOperations, Boolean içinde Boolean otomatik olarak düşürülüyor)
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)
System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClasse içinde. <Update>b__d()
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)
System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration) içinde
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run() içinde
ClientConnectionId:2b5f614b-caab-4be6-bc1b-a813b7356739
Hata Numarası:1919,Durum:1,Sınıf:16
Masa 'dbo. 'Hesap'daki 'Telefon' sütunu bir indekste anahtar sütun olarak kullanılamaz.
Hatanın nedeni, ef'in tüm dizi özelliklerinin varsayılan olarak NVARCHAR(Max) türünde olmasıdır,
Çözüm şöyledir:
Ipin uzunluğunu çalıştırın
Fotoğrafta da görüldüğü gibi, yaratım başarılı!
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Yayınlandı 23.11.2017 18:47:15
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