def visit_VARCHAR(self, type_, **kw):
if type_.length:
return self._extend_string(
type_, {}, "VARCHAR(%d)" % type_.length)
else:
raise exc.CompileError(
"VARCHAR requires a length on dialect %s" %
self.dialect.name)
to
def visit_VARCHAR(self, type_, **kw):
if type_.length is None:
type_.length = 255
if type_.length:
return self._extend_string(
type_, {}, "VARCHAR(%d)" % type_.length)
else:
raise exc.CompileError(
"VARCHAR requires a length on dialect %s" %
self.dialect.name)
sqlalchemy.exc.CompileError: (in table 'language_label', column 'name'): VARCHAR requires a length o
原文：https://www.cnblogs.com/liangliangzz/p/10300635.html