storage.py 文件源码

def load_dialect_impl(self, dialect):
        if dialect.name == 'postgresql':
            if dialect.server_version_info >= (9, 4):
                self.using_native_json = True
                return dialect.type_descriptor(postgresql.JSONB())
            if dialect.server_version_info >= (9, 2):
                self.using_native_json = True
                return dialect.type_descriptor(postgresql.JSON())
        return dialect.type_descriptor(types.Text())