Update

Author: Ja bist du narrisch

src/Migrator.Tests/Providers/SQLite/SQLiteTransformationProvider_AddTableTests.cs

@@ -22,7 +22,7 @@ public void AddForeignKey()
 
         // Assert
         var createScript = ((SQLiteTransformationProvider)_provider).GetSqlCreateTableScript(tableName);
-        Assert.That("CREATE TABLE MyTableName (MyColumn INTEGER UNIQUE)", Is.EqualTo(createScript));
+        Assert.That("CREATE TABLE MyTableName (MyColumnName INTEGER UNIQUE)", Is.EqualTo(createScript));
 
         var sqliteInfo = ((SQLiteTransformationProvider)_provider).GetSQLiteTableInfo(tableName);
         Assert.That(sqliteInfo.Uniques.Single().KeyColumns.Single(), Is.EqualTo(columnName));

src/Migrator/Providers/Impl/SQLite/SQLiteTransformationProvider.cs

@@ -519,12 +519,13 @@ public override void AddColumn(string table, Column column)
                 throw new Exception("Table does not exist.");
             }
 
-            if (ColumnExists(table, column.Name))
+            var sqliteInfo = GetSQLiteTableInfo(table);
+            if (sqliteInfo.ColumnMappings.Select(x => x.OldName).ToList().Contains(column.Name))
             {
                 throw new Exception("Column already exists.");
             }
 
-            var sqliteInfo = GetSQLiteTableInfo(table);
+            sqliteInfo.ColumnMappings.Add(new MappingInfo { OldName = column.Name, NewName = column.Name });
 
             sqliteInfo.Columns.Add(column);
         }
@@ -536,13 +537,12 @@ public override void ChangeColumn(string table, Column column)
                 throw new Exception("Table does not exist.");
             }
 
-            if (!ColumnExists(table, column.Name))
+            var sqliteInfo = GetSQLiteTableInfo(table);
+            if (!sqliteInfo.ColumnMappings.Select(x => x.OldName).ToList().Contains(column.Name))
             {
                 throw new Exception("Column does not exists.");
             }
 
-            var sqliteInfo = GetSQLiteTableInfo(table);
-
             sqliteInfo.Columns.Where(x => !x.Name.Equals(column.Name, StringComparison.InvariantCultureIgnoreCase));
 
             sqliteInfo.Columns.Add(column);