diff --git a/angel_orm_generator/lib/src/builder/orm/lib_core.dart b/angel_orm_generator/lib/src/builder/orm/lib_core.dart
deleted file mode 100644
index 254d3678..00000000
--- a/angel_orm_generator/lib/src/builder/orm/lib_core.dart
+++ /dev/null
@@ -1,5 +0,0 @@
-import 'package:code_builder/code_builder.dart';
-
-final TypeReference $void = new TypeReference((b) => b.symbol = 'void');
-
-final Expression override = new CodeExpression(new Code('override'));
\ No newline at end of file
diff --git a/angel_orm_generator/lib/src/readers.dart b/angel_orm_generator/lib/src/readers.dart
new file mode 100644
index 00000000..bba74bd4
--- /dev/null
+++ b/angel_orm_generator/lib/src/readers.dart
@@ -0,0 +1,19 @@
+import 'package:analyzer/dart/constant/value.dart';
+import 'package:angel_orm/angel_orm.dart';
+import 'package:source_gen/source_gen.dart';
+
+ORM reviveORMAnnotation(ConstantReader reader) {
+  return ORM(reader.peek('tableName')?.stringValue);
+}
+
+class ColumnReader {
+  final ConstantReader reader;
+
+  ColumnReader(this.reader);
+
+  bool get isNullable => reader.peek('isNullable')?.boolValue ?? true;
+
+  int get length => reader.peek('length')?.intValue;
+
+  DartObject get defaultValue => reader.peek('defaultValue')?.objectValue;
+}