Add option to ignore msys tables when scaffolding (#236)

* Add option to ignore msys tables when scaffolding

src/EFCore.Jet.Data/AdoxSchema.cs

@@ -13,6 +13,7 @@ namespace EntityFrameworkCore.Jet.Data
         private readonly dynamic _connection;
         private readonly dynamic _catalog;
 
+        private bool _ignoreMsys;
         public AdoxSchema(JetConnection connection, bool naturalOnly, bool readOnly)
             : this(connection, readOnly)
         {
@@ -22,7 +23,7 @@ namespace EntityFrameworkCore.Jet.Data
         public AdoxSchema(JetConnection connection, bool readOnly)
         {
             _connection = new ComObject("ADODB.Connection");
-
+            _ignoreMsys = connection.IgnoreMsys;
             try
             {
                 var connectionString = GetOleDbConnectionString(connection.ActiveConnectionString);
@@ -105,6 +106,11 @@ namespace EntityFrameworkCore.Jet.Data
 
                 var tableName = (string)table.Name;
 
+                if (tableName.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 // Depending on the provider (ODBC or OLE DB) used, the Tables collection might contain VIEWs
                 // that take parameters, which makes them procedures.
                 // We make sure here, that we exclude any procedures from the returned table list.
@@ -202,6 +208,11 @@ namespace EntityFrameworkCore.Jet.Data
                 using var table = tables[i];
                 var tableName = (string)table.Name;
 
+                if (tableName.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 using var columns = table.Columns;
                 var columnCount = columns.Count;
 
@@ -282,6 +293,11 @@ namespace EntityFrameworkCore.Jet.Data
                 using var table = tables[i];
                 var tableName = (string)table.Name;
 
+                if (tableName.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 using var indexes = table.Indexes;
                 var indexCount = (int)indexes.Count;
 
@@ -337,6 +353,11 @@ namespace EntityFrameworkCore.Jet.Data
                 using var table = tables[i];
                 var tableName = (string)table.Name;
 
+                if (tableName.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 using var indexes = table.Indexes;
                 var indexCount = (int)indexes.Count;
 
@@ -384,6 +405,11 @@ namespace EntityFrameworkCore.Jet.Data
                 using var table = tables[i];
                 var referencingTableName = (string)table.Name;
 
+                if (table.Name.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 using var keys = table.Keys;
                 var keyCount = (int)keys.Count;
 
@@ -446,6 +472,11 @@ namespace EntityFrameworkCore.Jet.Data
             {
                 using var table = tables[i];
 
+                if (table.Name.StartsWith("MSys", StringComparison.OrdinalIgnoreCase) && _ignoreMsys)
+                {
+                    continue;
+                }
+
                 using var keys = table.Keys;
                 var keyCount = (int)keys.Count;
 

src/EFCore.Jet.Data/JetConnection.cs

@@ -28,7 +28,7 @@ namespace EntityFrameworkCore.Jet.Data
         internal string? FileNameOrConnectionString => ConnectionString;
 
         public const string DefaultDualTableName = "#Dual";
-
+        private bool _ignoreMSys;
         /// <summary>
         /// Initializes a new instance of the <see cref="JetConnection"/> class.
         /// </summary>
@@ -81,6 +81,8 @@ namespace EntityFrameworkCore.Jet.Data
         /// </value>
         public bool IsEmpty { get; set; }
 
+        public bool IgnoreMsys => _ignoreMSys;
+
         /// <summary>
         /// Gets the <see cref="T:System.Data.Common.DbProviderFactory" /> for this <see cref="T:System.Data.Common.DbConnection" />.
         /// </summary>
@@ -358,6 +360,12 @@ namespace EntityFrameworkCore.Jet.Data
             var connectionStringBuilder = DataAccessProviderFactory.CreateConnectionStringBuilder();
             connectionStringBuilder.ConnectionString = connectionString;
 
+            if (connectionStringBuilder.Remove("IgnoreMsys"))
+            {
+                _ignoreMSys = true;
+                connectionString = connectionStringBuilder.ToString();
+            }
+
             if (string.IsNullOrWhiteSpace(connectionStringBuilder.GetProvider()))
             {
                 var provider = GetMostRecentCompatibleProviders(dataAccessProviderType.Value)

src/EFCore.Jet/Scaffolding/Internal/JetDatabaseModelFactory.cs

@@ -52,6 +52,9 @@ namespace EntityFrameworkCore.Jet.Scaffolding.Internal
 
         private readonly IDiagnosticsLogger<DbLoggerCategory.Scaffolding> _logger;
         private readonly IRelationalTypeMappingSource _typeMappingSource;
+
+        private bool _ignoreMsys = false;
+        private List<string> _msysNames = new List<string>();
         /// <summary>
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
         ///     directly from your code. This API may change or be removed in future releases.
@@ -75,7 +78,6 @@ namespace EntityFrameworkCore.Jet.Scaffolding.Internal
         {
             Check.NotEmpty(connectionString, nameof(connectionString));
             Check.NotNull(options, nameof(options));
-
             using var connection = new JetConnection(connectionString);
             return Create(connection, options);
         }
@@ -99,6 +101,7 @@ namespace EntityFrameworkCore.Jet.Scaffolding.Internal
             if (!connectionStartedOpen)
             {
                 connection.Open();
+                _ignoreMsys = ((JetConnection)connection).IgnoreMsys;
             }
 
             try
@@ -133,11 +136,11 @@ namespace EntityFrameworkCore.Jet.Scaffolding.Internal
                 }
 
                 var tableNames = databaseModel.Tables.Select(t => t.Name).ToList();
-                if (tableNames.Contains("MSysAccessStorage"))
+                if (tableNames.Contains("MSysAccessStorage") || _msysNames.Contains("MSysAccessStorage"))
                 {
                     JetConfiguration.DetectedDualTableName = "MSysAccessStorage";
                 }
-                else if (tableNames.Contains("MSysRelationships"))
+                else if (tableNames.Contains("MSysRelationships") || _msysNames.Contains("MSysRelationships"))
                 {
                     JetConfiguration.DetectedDualTableName = "MSysRelationships";
                 }
@@ -196,8 +199,13 @@ namespace EntityFrameworkCore.Jet.Scaffolding.Internal
                         ? new DatabaseTable() { Database = databaseModel, Name = name! }
                         : new DatabaseView() { Database = databaseModel, Name = name! };
 
+                    var isMsys = table.Name.StartsWith("MSys", StringComparison.OrdinalIgnoreCase);
+                    if (isMsys)
+                    {
+                        _msysNames.Add(table.Name);
+                    }
                     var isValidByFilter = filter?.Invoke(table.Schema!, table.Name) ?? true;
-                    if (isValidByFilter)
+                    if (isValidByFilter && !(_ignoreMsys && isMsys))
                     {
                         tables.Add(table);
                     }