예제 #1
0
        private void TestSchemaUpdateImpl()
        {
            SetupHelper.DropSchemaObjects(SchemaName);
              var supportsClustIndex = SetupHelper.Driver.Supports(DbFeatures.ClusteredIndexes);

              //version 1 of model/schema
              {
            var app = new EntityAppV1();

            SetupHelper.ActivateApp(app); //updates schema

            // Load DbModel and verify it is correct
            var dbModel = SetupHelper.LoadDbModel(SchemaName, app.ActivationLog);
            Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 6 tables."); //2 tables in DbInfo + 4 tables in our module
            var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
            Assert.AreEqual(8, parTable.Columns.Count, "Invalid number of columns in parent table.");
            var keyCount = CountKeys(parTable);
            //Keys: PK, FK to IEntityToDelete, index on FK to IEntityToDelete, index on IntProp,StringProp, (ClusteredIndex?)
            Assert.AreEqual(5, keyCount, "Invalid # of keys in parent table.");

            if (supportsClustIndex) {
              var parCI = parTable.Keys.First(k => k.KeyType.IsSet(KeyType.ClusteredIndex));
              Assert.AreEqual(1, parCI.KeyColumns.Count, "Invalid number of fields in clustered index.");
            }

            //child entity
            var childTable = dbModel.GetTable(SchemaName, "ChildEntity");
            Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table.");
            // some servers like MySql create FK and Index on it under the same name. When loading, such a key should be marked with 2 flags
            // so let's count these separately; should be 5: PK + 2 foreign keys + 2 indexes on FK
            keyCount = CountKeys(childTable);
            Assert.AreEqual(5, keyCount, "Invalid # of keys in child table.");

            //Create a few records
            var session = app.OpenSession();
            var parent = session.NewEntity<EntityModuleV1.IParentEntity>();
            parent.IntProp = 4;
            parent.StringProp = "Some string";
            parent.SingleProp = 4.56f;
            parent.DoubleProp = 5.67;
            parent.IntPropWithDefault = 567;
            parent.StringProp2_OldName = "Old string";
            var child = session.NewEntity<EntityModuleV1.IChildEntity>();
            child.Parent = parent;
            child.ParentRefToDelete = parent;
            child.Name = "Child name";
            var entToDelete = session.NewEntity<EntityModuleV1.IEntityToDelete>();
            entToDelete.Name = "some-name";
            parent.EntityToDeleteRef = entToDelete;
            session.SaveChanges();
            app.Shutdown();
              }

              //Now change to version 2 ================================================================
              {
            var app = new EntityAppV2();
            SetupHelper.ActivateApp(app, dropUnknownTables: true);

            //At this point the schema should have been updated; let's check it
            // Load DbModel and verify it is correct
            var dbModel = SetupHelper.LoadDbModel(SchemaName, app.ActivationLog);
            Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 6 tables after update.");
            var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
            Assert.AreEqual(7, parTable.Columns.Count, "Invalid number of columns in parent table after schema update.");
            Assert.AreEqual(3, parTable.Keys.Count, //PK, Clustered index, index on IntProp,StringProp
               "Invalid # of keys in parent table after update.");
            if (supportsClustIndex) {
              //SQL CE does not support clustered indexes
              var parCI = parTable.Keys.First(k => k.KeyType.IsSet(KeyType.ClusteredIndex));
              Assert.AreEqual(2, parCI.KeyColumns.Count, "Invalid number of fields in clustered index."); //
            }
            //child entity
            var childTable = dbModel.GetTable(SchemaName, "ChildEntityRenamed");
            Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table after update.");
            var keyCount = CountKeys(childTable); // = 5:  Clustered PK, FK to parent, index on FK, FK to OtherParent, index on FK
            Assert.AreEqual(5, keyCount, "Invalid # of keys in child table after update.");
            //Check that post-upgrade action is executed - check records are added to INewTable
            var session = app.OpenSession();
            var newTableEntCount = session.EntitySet<EntityModuleV2.INewTable>().Count();
            Assert.AreEqual(2, newTableEntCount, "Expected 2 entities in INewTable.");

            //  Now create model again, compare it and make sure no schema updates
            var ds = app.GetDefaultDataSource();
            var dbUpdater = new DbUpgradeManager(ds);
            var upgradeInfo = dbUpdater.BuildUpgradeInfo();
            // if we have upgrade scripts, this is error
            if (upgradeInfo.AllScripts.Count > 0) {
              var strUpdates = upgradeInfo.AllScripts.GetAllAsText();
              Debug.WriteLine("Detected updates when no schema changes should be present:");
              Debug.WriteLine(strUpdates);
              Assert.IsTrue(false, "Schema changes count should be zero.");
            }
            app.Flush();
              }
        }
예제 #2
0
        //Separate implementation for SQLite. SQLite does not support column-modify, table-rename, etc.
        // So we try to account for these in this special version
        private void TestSchemaUpdateImplSQLite()
        {
            //Start from fresh copy of the database
              File.Copy("..\\..\\VitaTestSQLite.db", "VitaTestSQLite.db", overwrite: true);

              //version 1 of model/schema
              {
            var app = new EntityAppV1();
            SetupHelper.ActivateApp(app); //updates schema

            // Load DbModel and verify it is correct
            var dbModel = SetupHelper.LoadDbModel(SchemaName, app.ActivationLog);
            Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 4 tables.");
            var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
            Assert.AreEqual(8, parTable.Columns.Count, "Invalid number of columns in parent table.");
            var keyCount = CountKeys(parTable);
            //Keys: PK, FK to IEntityToDelete, index on FK to IEntityToDelete, index on IntProp,StringProp
            Assert.AreEqual(4, keyCount, "Invalid # of keys in parent table.");

            //child entity
            var childTable = dbModel.GetTable(SchemaName, "ChildEntity");
            Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table.");
            // 3 - PK + 2FKs, no indexes on FKs
            Assert.AreEqual(3, childTable.Keys.Count, "Invalid # of keys in child table.");

            //Create a few records
            var session = app.OpenSession();
            var parent = session.NewEntity<EntityModuleV1.IParentEntity>();
            parent.IntProp = 4;
            parent.StringProp = "Some string";
            parent.SingleProp = 4.56f;
            parent.DoubleProp = 5.67;
            parent.IntPropWithDefault = 567;
            parent.StringProp2_OldName = "Old string";
            var child = session.NewEntity<EntityModuleV1.IChildEntity>();
            child.Parent = parent;
            child.ParentRefToDelete = parent;
            child.Name = "Child name";
            var entToDelete = session.NewEntity<EntityModuleV1.IEntityToDelete>();
            entToDelete.Name = "some-name";
            parent.EntityToDeleteRef = entToDelete;
            session.SaveChanges();
            app.Flush();
            app.Shutdown();
              }
              //Now change to version 2 ================================================================
              {
            var app = new EntityAppV2();
            SetupHelper.ActivateApp(app, dropUnknownTables: true);

            //At this point the schema should have been updated; let's check it
            // Load DbModel and verify it is correct
            var dbModel = SetupHelper.LoadDbModel(SchemaName, app.ActivationLog);
            //Note that we still have 4 tables, EntityToDelete is not dropped because of incoming FK
            Assert.AreEqual(7, dbModel.Tables.Count(), "Expected 7 tables after update.");
            var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
            //NO support for dropping columns, so old columns are not deleted; instead of renaming a new column is added
            Assert.AreEqual(11, parTable.Columns.Count, "Invalid number of columns in parent table after schema update.");
            Assert.AreEqual(4, parTable.Keys.Count, //PK, FK->EntityToDelete, indexes (IntProp,StringProp), (StropProp,Id)
               "Invalid # of keys in parent table after update.");
            //child entity
            var childTable = dbModel.GetTable(SchemaName, "ChildEntity");
            Assert.AreEqual(6, childTable.Columns.Count, "Invalid number of columns in child table after update.");
            // = 3:  Clustered PK, FK to parent, index on FK
            Assert.AreEqual(3, childTable.Keys.Count, "Invalid # of keys in child table after update.");
            //Check that post-upgrade action is executed - check records are added to INewTable
            var session = app.OpenSession();
            var newTableEntCount = session.EntitySet<EntityModuleV2.INewTable>().Count();
            Assert.AreEqual(2, newTableEntCount, "Expected 2 entities in INewTable.");

            // Now create model again, compare it and make sure no schema updates
            var ds = app.GetDefaultDataSource();
            var upgradeMgr = new DbUpgradeManager(ds);
            var upgradeInfo = upgradeMgr.BuildUpgradeInfo();
            if (upgradeInfo.AllScripts.Count > 0) {
              var strUpdates = upgradeInfo.AllScripts.GetAllAsText();
              Debug.WriteLine("Detected updates when no schema changes should be present:");
              Debug.WriteLine(strUpdates);
              Assert.IsTrue(false, "Schema changes count should be zero.");
            }
            app.Flush();
              }
        }
예제 #3
0
        private void TestSchemaUpdateImpl()
        {
            Startup.DropSchemaObjects(SchemaName);
            var supportsClustIndex = Startup.Driver.Supports(DbFeatures.ClusteredIndexes);

            //version 1 of model/schema
            {
                var app = new EntityAppV1();

                Startup.ActivateApp(app); //updates schema

                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(SchemaName, app.SystemLog);
                Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 6 tables."); //2 tables in DbInfo + 4 tables in our module
                var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
                Assert.AreEqual(8, parTable.Columns.Count, "Invalid number of columns in parent table.");
                var keyCount = CountKeys(parTable);
                //Keys: PK, FK to IEntityToDelete, index on FK to IEntityToDelete, index on IntProp,StringProp, (ClusteredIndex?)
                Assert.AreEqual(5, keyCount, "Invalid # of keys in parent table.");

                if (supportsClustIndex)
                {
                    var parCI = parTable.Keys.First(k => k.KeyType.IsSet(KeyType.ClusteredIndex));
                    Assert.AreEqual(1, parCI.KeyColumns.Count, "Invalid number of fields in clustered index.");
                }

                //child entity
                var childTable = dbModel.GetTable(SchemaName, "ChildEntity");
                Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table.");
                // some servers like MySql create FK and Index on it under the same name. When loading, such a key should be marked with 2 flags
                // so let's count these separately; should be 5: PK + 2 foreign keys + 2 indexes on FK
                keyCount = CountKeys(childTable);
                Assert.AreEqual(5, keyCount, "Invalid # of keys in child table.");

                //Create a few records
                var session = app.OpenSession();
                var parent  = session.NewEntity <EntityModuleV1.IParentEntity>();
                parent.IntProp             = 4;
                parent.StringProp          = "Some string";
                parent.SingleProp          = 4.56f;
                parent.DoubleProp          = 5.67;
                parent.IntPropWithDefault  = 567;
                parent.StringProp2_OldName = "Old string";
                var child = session.NewEntity <EntityModuleV1.IChildEntity>();
                child.Parent            = parent;
                child.ParentRefToDelete = parent;
                child.Name = "Child name";
                var entToDelete = session.NewEntity <EntityModuleV1.IEntityToDelete>();
                entToDelete.Name         = "some-name";
                parent.EntityToDeleteRef = entToDelete;
                session.SaveChanges();
                app.Shutdown();
            }

            //Now change to version 2 ================================================================
            {
                var app = new EntityAppV2();
                Startup.ActivateApp(app, dropUnknownTables: true);

                //At this point the schema should have been updated; let's check it
                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(SchemaName, app.SystemLog);
                Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 6 tables after update.");
                var parTable = dbModel.GetTable(SchemaName, "ParentEntity");
                Assert.AreEqual(7, parTable.Columns.Count, "Invalid number of columns in parent table after schema update.");
                Assert.AreEqual(3, parTable.Keys.Count, //PK, Clustered index, index on IntProp,StringProp
                                "Invalid # of keys in parent table after update.");
                if (supportsClustIndex)
                {
                    //SQL CE does not support clustered indexes
                    var parCI = parTable.Keys.First(k => k.KeyType.IsSet(KeyType.ClusteredIndex));
                    Assert.AreEqual(2, parCI.KeyColumns.Count, "Invalid number of fields in clustered index."); //
                }
                //child entity
                var childTable = dbModel.GetTable(SchemaName, "ChildEntityRenamed");
                Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table after update.");
                var keyCount = CountKeys(childTable); // = 5:  Clustered PK, FK to parent, index on FK, FK to OtherParent, index on FK
                Assert.AreEqual(5, keyCount, "Invalid # of keys in child table after update.");
                //Check that post-upgrade action is executed - check records are added to INewTable
                var session          = app.OpenSession();
                var newTableEntCount = session.EntitySet <EntityModuleV2.INewTable>().Count();
                Assert.AreEqual(2, newTableEntCount, "Expected 2 entities in INewTable.");

                //  Now create model again, compare it and make sure no schema updates
                var ds          = app.GetDefaultDataSource();
                var dbUpdater   = new DbUpgradeManager(ds);
                var upgradeInfo = dbUpdater.BuildUpgradeInfo();
                // if we have upgrade scripts, this is error
                if (upgradeInfo.AllScripts.Count > 0)
                {
                    var strUpdates = upgradeInfo.AllScripts.GetAllAsText();
                    Debug.WriteLine("Detected updates when no schema changes should be present:");
                    Debug.WriteLine(strUpdates);
                    Assert.IsTrue(false, "Schema changes count should be zero.");
                }
                app.Flush();
            }
        }//method
예제 #4
0
        //Separate implementation for SQLite. SQLite does not support column-modify, table-rename, etc.
        // So we try to account for these in this special version
        private void TestSchemaUpdateImplSQLite()
        {
            //Start from fresh copy of the database
            File.Copy("..\\..\\VitaTestSQLite.db", "VitaTestSQLite.db", overwrite: true);
            // Note - we have the flag AddSchemaToTableName for SQlite setup (default),
            //  so table names are prefixed with 'upd_'

            //version 1 of model/schema
            {
                var app = new EntityAppV1();
                Startup.ActivateApp(app); //updates schema

                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(SchemaName, app.SystemLog);
                Assert.AreEqual(6, dbModel.Tables.Count(), "Expected 4 tables.");
                var parTable = dbModel.GetTable(null, "upd_ParentEntity");
                Assert.AreEqual(8, parTable.Columns.Count, "Invalid number of columns in parent table.");
                var keyCount = CountKeys(parTable);
                //Keys: PK, FK to IEntityToDelete, index on FK to IEntityToDelete, index on IntProp,StringProp
                Assert.AreEqual(4, keyCount, "Invalid # of keys in parent table.");


                //child entity
                var childTable = dbModel.GetTable(SchemaName, "upd_ChildEntity");
                Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table.");
                // 3 - PK + 2FKs, no indexes on FKs
                Assert.AreEqual(3, childTable.Keys.Count, "Invalid # of keys in child table.");

                //Create a few records
                var session = app.OpenSession();
                var parent  = session.NewEntity <EntityModuleV1.IParentEntity>();
                parent.IntProp             = 4;
                parent.StringProp          = "Some string";
                parent.SingleProp          = 4.56f;
                parent.DoubleProp          = 5.67;
                parent.IntPropWithDefault  = 567;
                parent.StringProp2_OldName = "Old string";
                var child = session.NewEntity <EntityModuleV1.IChildEntity>();
                child.Parent            = parent;
                child.ParentRefToDelete = parent;
                child.Name = "Child name";
                var entToDelete = session.NewEntity <EntityModuleV1.IEntityToDelete>();
                entToDelete.Name         = "some-name";
                parent.EntityToDeleteRef = entToDelete;
                session.SaveChanges();
                app.Flush();
                app.Shutdown();
            }
            //Now change to version 2 ================================================================
            {
                var app = new EntityAppV2();
                Startup.ActivateApp(app, dropUnknownTables: true);

                //At this point the schema should have been updated; let's check it
                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(SchemaName, app.SystemLog);
                //Note that we still have 4 tables, EntityToDelete is not dropped because of incoming FK
                Assert.AreEqual(7, dbModel.Tables.Count(), "Expected 7 tables after update.");
                var parTable = dbModel.GetTable(SchemaName, "upd_ParentEntity");
                //NO support for dropping columns, so old columns are not deleted; instead of renaming a new column is added
                Assert.AreEqual(11, parTable.Columns.Count, "Invalid number of columns in parent table after schema update.");
                Assert.AreEqual(4, parTable.Keys.Count, //PK, FK->EntityToDelete, indexes (IntProp,StringProp), (StropProp,Id)
                                "Invalid # of keys in parent table after update.");
                //child entity
                var childTable = dbModel.GetTable(SchemaName, "upd_ChildEntity");
                Assert.AreEqual(6, childTable.Columns.Count, "Invalid number of columns in child table after update.");
                // = 3:  Clustered PK, FK to parent, index on FK
                Assert.AreEqual(3, childTable.Keys.Count, "Invalid # of keys in child table after update.");
                //Check that post-upgrade action is executed - check records are added to INewTable
                var session          = app.OpenSession();
                var newTableEntCount = session.EntitySet <EntityModuleV2.INewTable>().Count();
                Assert.AreEqual(2, newTableEntCount, "Expected 2 entities in INewTable.");

                // Now create model again, compare it and make sure no schema updates
                var ds          = app.GetDefaultDataSource();
                var upgradeMgr  = new DbUpgradeManager(ds);
                var upgradeInfo = upgradeMgr.BuildUpgradeInfo();
                if (upgradeInfo.AllScripts.Count > 0)
                {
                    var strUpdates = upgradeInfo.AllScripts.GetAllAsText();
                    Debug.WriteLine("Detected updates when no schema changes should be present:");
                    Debug.WriteLine(strUpdates);
                    Assert.IsTrue(false, "Schema changes count should be zero.");
                }
                app.Flush();
            }
        }
예제 #5
0
        private void TestSchemaUpdateImpl()
        {
            // Prepare Db settings, wipe out old tables - we have to do it this way, because of complexities with Oracle
            var dbSettings = new DbSettings(Startup.Driver, Startup.DbOptions,
                                            Startup.ConnectionString, upgradeMode: DbUpgradeMode.Always, upgradeOptions: DbUpgradeOptions.Default);

            DataUtility.DropTablesSafe(dbSettings, SchemaName, "ChildEntity", "ChildEntityRenamed", "ParentEntity",
                                       "Table", "NewTable", "DbInfo", "DbModuleInfo");

            var supportsClustIndex = Startup.Driver.Supports(DbFeatures.ClusteredIndexes);

            //version 1 of model/schema
            {
                var app = new EntityAppV1();

                SpecialActivateApp(app, dbSettings, true);

                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(app);
                Assert.AreEqual(6, dbModel.Tables.Count, "Expected 6 tables."); //2 tables in DbInfo + 4 tables in our module
                var parTable = FindTable(dbModel, SchemaName, "ParentEntity");
                Assert.AreEqual(8, parTable.Columns.Count, "Invalid number of columns in parent table.");
                var keyCount = CountKeys(parTable);
                //Keys: PK, FK to IEntityToDelete, index on FK to IEntityToDelete, index on IntProp,StringProp
                Assert.AreEqual(4, keyCount, "Invalid # of keys in parent table.");

                //child entity
                var childTable = FindTable(dbModel, SchemaName, "ChildEntity");
                Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table.");
                // some servers like MySql create FK and Index on it under the same name. When loading, such a key should be marked with 2 flags
                // so let's count these separately; should be 3: PK + 2 foreign keys
                //   note:  indexes on FK are not auto-created
                keyCount = CountKeys(childTable);
                // For MySql, for every FK a supporting index is created (automatically), so we have 2 extra indexes on FKs
                // for other servers indexes on FK not created.
                var expectedKeyCount = Startup.ServerType == DbServerType.MySql ? 5 : 3;
                Assert.AreEqual(expectedKeyCount, keyCount, "Invalid # of keys in child table.");

                //Create a few records
                var session = app.OpenSession();
                var parent  = session.NewEntity <EntityModuleV1.IParentEntity>();
                parent.IntProp             = 4;
                parent.StringProp          = "Some string";
                parent.SingleProp          = 4.56f;
                parent.DoubleProp          = 5.67;
                parent.IntPropWithDefault  = 567;
                parent.StringProp2_OldName = "Old string";
                var child = session.NewEntity <EntityModuleV1.IChildEntity>();
                child.Parent            = parent;
                child.ParentRefToDelete = parent;
                child.Name = "Child name";
                var entToDelete = session.NewEntity <EntityModuleV1.IEntityToDelete>();
                entToDelete.Name         = "some-name";
                parent.EntityToDeleteRef = entToDelete;
                session.SaveChanges();
                app.Shutdown();
            }

            //Now change to version 2 ================================================================
            {
                var app = new EntityAppV2();
                // use fresh dbSettings to avoid sharing db model (we could drop the DbOptions.ShareDbModel flag instead)
                dbSettings = new DbSettings(Startup.Driver, Startup.DbOptions,
                                            Startup.ConnectionString, upgradeMode: DbUpgradeMode.Always, upgradeOptions: DbUpgradeOptions.Default | DbUpgradeOptions.DropUnknownObjects);
                SpecialActivateApp(app, dbSettings, false);

                //At this point the schema should have been updated; let's check it
                // Load DbModel and verify it is correct
                var dbModel = Startup.LoadDbModel(app);
                // 2 tables in DbInfo module, 4 tables in test app
                Assert.AreEqual(6, dbModel.Tables.Count, "Expected 6 tables after update.");
                var parTable = FindTable(dbModel, SchemaName, "ParentEntity");
                Assert.AreEqual(7, parTable.Columns.Count, "Invalid number of columns in parent table after schema update.");
                Assert.AreEqual(3, parTable.Keys.Count, //PK, Clustered index, index on IntProp,StringProp
                                "Invalid # of keys in parent table after update.");
                if (supportsClustIndex)
                {
                    //SQL CE does not support clustered indexes
                    var parCI = parTable.Keys.First(k => k.KeyType.IsSet(KeyType.ClusteredIndex));
                    Assert.AreEqual(2, parCI.KeyColumns.Count, "Invalid number of fields in clustered index."); //
                }
                //child entity
                var childTable = FindTable(dbModel, SchemaName, "ChildEntityRenamed");
                Assert.AreEqual(5, childTable.Columns.Count, "Invalid number of columns in child table after update.");
                var keyCount = CountKeys(childTable); // = 3:  Clustered PK, FK to parent, FK to OtherParent; (indexes on FKs are not auto-created)
                // For MySql, for every FK a supporting index is created (automatically), so we have 2 extra indexes on FKs
                // for other servers indexes on FK not created.
                var expectedKeyCount = Startup.ServerType == DbServerType.MySql ? 5 : 3;
                Assert.AreEqual(expectedKeyCount, keyCount, "Invalid # of keys in child table after update.");
                //Check that post-upgrade action is executed - check records are added to INewTable
                var session          = app.OpenSession();
                var newTableEntCount = session.EntitySet <EntityModuleV2.INewTable>().Count();
                Assert.AreEqual(2, newTableEntCount, "Expected 2 entities in INewTable.");

                //  Now create model again, compare it and make sure no schema updates
                var ds          = app.GetDefaultDataSource();
                var dbUpdater   = new DbUpgradeManager(ds.Database, app.ActivationLog);
                var upgradeInfo = dbUpdater.BuildUpgradeInfo();
                // if we have upgrade scripts, this is error
                if (upgradeInfo.AllScripts.Count > 0)
                {
                    var strUpdates = upgradeInfo.AllScripts.GetAllAsText();
                    Debug.WriteLine("Detected updates when no schema changes should be present:");
                    Debug.WriteLine(strUpdates);
                    Assert.IsTrue(false, "Schema changes count should be zero.");
                }
                app.Flush();
            }
        }//method