Jos haluat luoda indeksin ja nopeuttaa kyselyä, lisää [Index]-attribuutti attribuuttiin ja generoi koodi automaattisesti seuraavasti:
Päivitämme tietokannan ja virhe on seuraava:
System.Data.SqlClient.SqlException (0x80131904): taulukko 'dbo. Saraketta 'Puhelin' 'Tili'-osiossa ei voi käyttää avainsarakkeena indeksissä.
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)
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)
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource'1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean&usedCache, Boolean asyncWrite, Boolean inRetry)
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() -tiedostossa
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcherissa. <NonQuery>b__0(DbCommand t, DbCommandInterceptionContext'1 c)
System.Data.Entity.Infrastructure.Interception.InternalDispatcher'1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func'3-operaatio, TInterceptionContext interceptionContext, Action'3 suoritetaan, Action'3 suoritetaan)
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand-komento, DbCommandInterceptionContext interceptionContext)
System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery() -tiedostossa
In System.Data.Entity.Migrations.DbMigrator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql (MigrationStatement migrationStatement, DbConnection, DbTransaction transaction , DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable'1 migrationStatements, DbConnection-yhteys, DbTransaction-transaktio, DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinTransaction(IEnumerable'1) migrationStatements, DbTransaction transaction, DbInterceptionContext interceptionContext)
In System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinNewTransaction(IEnumerable'1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable'1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
osoitteessa System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable'1 migrationStatements, DbConnection connection)
osoitteessa System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClass32. <ExecuteStatements>b__30()
In System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1. <Execute>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func'1 operation)
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatements (IEnumerable'1 migrationStatements, DbTransaction existingTransaction)
System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable'1 migrationStatements)
osoitteessa System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable'1 migrationStatements)
In System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, VersionedModel targetModel, IEnumerable'1 operations, IEnumerable'1 systemOperations, Boolean alennus, Boolean auto)
osoitteessa System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
osoitteessa 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)
In System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClasse. <Update>b__d()
osoitteessa System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
osoitteessa System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.DbMigrator.Update(merkkijono targetMigration)
System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
osoitteessa System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
In System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
ClientConnectionId:2b5f614b-caab-4be6-bc1b-a813b7356739
Virhenumero:1919,Osavaltio:1,Luokka:16
Pöytä 'dbo. Saraketta 'Puhelin' 'Tili'-osiossa ei voi käyttää avainsarakkeena indeksissä.
Virheen syynä on se, että kaikki ef:n merkkijonon ominaisuudet ovat oletuksena tyyppiä NVARCHAR(Max),
Ratkaisu on seuraava:
Suorita merkkijonon pituus
Kuten kuvassa näkyy, luomus onnistuu!
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Julkaistu 23.11.2017 18.47.15
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