added type check methods to column_definition

src/sql/column_definition.cpp

@@ -63,6 +63,46 @@ const std::string &column_definition::ref_column() const
   return ref_column_;
 }
 
+bool column_definition::is_integer() const
+{
+  return type_ >= data_type_t::type_char && type_ <= data_type_t::type_unsigned_long_long;
+}
+
+bool column_definition::is_floating_point() const
+{
+  return type_ == data_type_t::type_float || type_ == data_type_t::type_double;
+}
+
+bool column_definition::is_bool() const
+{
+  return type_ == data_type_t::type_bool;
+}
+
+bool column_definition::is_string() const
+{
+  return type_ == data_type_t::type_text;
+}
+
+bool column_definition::is_varchar() const
+{
+  return type_ == data_type_t::type_varchar;
+}
+
+bool column_definition::is_blob() const
+{
+  return type_ == data_type_t::type_blob;
+}
+
+bool column_definition::is_null() const
+{
+  return type_ == data_type_t::type_null;
+}
+
+bool column_definition::is_unknown() const
+{
+  return type_ == data_type_t::type_unknown;
+}
+
 void column_definition::type(data_type_t type)
 {
   type_ = type;