psycopg2.errors.NumericValueOutOfRange: integer out of range

先看一个报错：

gunicorn[121154]: ERROR: Internal Server Error: /sb/buildprogressnote/
Traceback (most recent call last):
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/backends/utils.py", line 82, in _execute
    return self.cursor.execute(sql)
psycopg2.errors.NumericValueOutOfRange: integer out of range


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/ymk_test/buildapi/restapi/restview.py", line 205, in __call__
    return getattr(self, method)(request, *args, **kwargs)
  File "/ymk_test/buildapi/restapi/restutils.py", line 264, in wrapper
    data = func(*args, **kwargs)
  File "/ymk_test/buildapi/restapi/restview.py", line 516, in GET
    cursor.execute(
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/backends/utils.py", line 66, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/backends/utils.py", line 75, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/ymk_test/buildapi/my_venv/lib64/python3.8/site-packages/django/db/backends/utils.py", line 82, in _execute
    return self.cursor.execute(sql)
django.db.utils.DataError: integer out of range

这里，我打印了下报错的 sql 语句为：

cursor.execute("SELECt reltuples::int FROM pg_class WHERe relname = '%s'"
                   % queryset.model._meta.db_table)

然后，就是报出上述错误，这里注意下，reltuples::int  ，由于查出的 reltuples 字段的数据量可能很大，所以对一些字段往往是可以直接添加数据类型的，这里用的是 int ，而 postgres 中 int 的最大值为：2147483647，这样一来，就有可能出现上述的报错了：psycopg2.errors.NumericValueOutOfRange: integer out of range 

完全就是由于 int 已经不足以表示字段 reltuples 的值了，因此，只需要将其换位 bigint 就可以了。

cursor.execute("SELECt reltuples::bigint FROM pg_class WHERe relname = '%s'"
                   % queryset.model._meta.db_table)

然后就不报错了。