我正在使用Flask工厂模式，直到最近才知道如何在应用程序上下文中使用数据库对象。现在更清楚地理解了这一点，每当我尝试查询模型时，我的代码就会产生分段错误。
在请求中，我有：
with current_app.app_context():
eml = current_app.db.session.query(EmailList).all()
我还试图查询EmailList模型：
with current_app.app_context():
eml = EmailList.query.all()
这两个都来自uWSGI：
!!! uWSGI process 2014 got Segmentation Fault !!!
*** backtrace of 2014 ***
0 uwsgi 0x000000010111d750 uwsgi_backtrace + 48
1 uwsgi 0x000000010111dc93 uwsgi_segfault + 51
2 libsystem_platform.dylib 0x00007fffb3ec9bba _sigtramp + 26
3 ??? 0x00000000000000b0 0x0 + 176
4 libsqlite3.dylib 0x00007fffb3860038 fillInUnixFile + 568
5 libsqlite3.dylib 0x00007fffb385fc70 unixOpen + 2192
6 libsqlite3.dylib 0x00007fffb385bab8 sqlite3BtreeOpen + 2856
7 libsqlite3.dylib 0x00007fffb3857a21 openDatabase + 1169
8 _sqlite3.so 0x00000001026d8ac5 pysqlite_connection_init + 509
9 Python 0x000000010129dad8 _PyType_Lookup + 1398
10 Python 0x000000010125b75b PyObject_Call + 99
11 _sqlite3.so 0x00000001026dcd3f init_sqlite3 + 1358
12 Python 0x00000001012d710c PyEval_EvalFrameEx + 13560
13 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
14 Python 0x0000000101279531 PyFunction_SetClosure + 826
15 Python 0x000000010125b75b PyObject_Call + 99
16 Python 0x00000001012d7045 PyEval_EvalFrameEx + 13361
17 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
18 Python 0x00000001012da442 _PyEval_SliceIndex + 338
19 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
20 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
21 Python 0x00000001012da442 _PyEval_SliceIndex + 338
22 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
23 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
24 Python 0x0000000101279531 PyFunction_SetClosure + 826
25 Python 0x000000010125b75b PyObject_Call + 99
26 Python 0x000000010126640c PyMethod_New + 1221
27 Python 0x000000010125b75b PyObject_Call + 99
28 Python 0x00000001012a2283 _PyObject_SlotCompare + 5559
29 Python 0x000000010129dad8 _PyType_Lookup + 1398
30 Python 0x000000010125b75b PyObject_Call + 99
31 Python 0x00000001012d67eb PyEval_EvalFrameEx + 11223
32 Python 0x00000001012da4d5 _PyEval_SliceIndex + 485
33 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
34 Python 0x00000001012da4d5 _PyEval_SliceIndex + 485
35 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
36 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
37 Python 0x00000001012da442 _PyEval_SliceIndex + 338
38 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
39 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
40 Python 0x00000001012da442 _PyEval_SliceIndex + 338
41 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
42 Python 0x00000001012da4d5 _PyEval_SliceIndex + 485
43 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
44 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
45 Python 0x00000001012da442 _PyEval_SliceIndex + 338
46 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
47 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
48 Python 0x00000001012da442 _PyEval_SliceIndex + 338
49 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
50 Python 0x00000001012da4d5 _PyEval_SliceIndex + 485
51 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
52 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
53 Python 0x00000001012da442 _PyEval_SliceIndex + 338
54 Python 0x00000001012d6eae PyEval_EvalFrameEx + 12954
55 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
56 Python 0x0000000101279531 PyFunction_SetClosure + 826
57 Python 0x000000010125b75b PyObject_Call + 99
58 Python 0x00000001012d7045 PyEval_EvalFrameEx + 13361
59 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
60 Python 0x0000000101279531 PyFunction_SetClosure + 826
61 Python 0x000000010125b75b PyObject_Call + 99
62 Python 0x00000001012d7045 PyEval_EvalFrameEx + 13361
63 Python 0x00000001012d3a1e PyEval_EvalCodeEx + 1617
*** end of backtrace ***
DAMN ! worker 1 (pid: 2014) died :( trying respawn ...
Respawned uWSGI worker 1 (new pid: 2015)
我在 database.py ：
中创建了db对象from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
我在 models.py ：
中使用该db对象from database import db
class EmailList(db.Model):
# model definition
我在 create_app（）调用中启动它，同时在应用程序上下文中创建表：
from database import db
db.init_app(app)
"""Import the models."""
with app.app_context():
from models import EmailList, BlogPost
db.create_all()
app.db = db
据我了解，我应该可以使用：
with current_app.app_context():
eml = current_app.db.session.query(EmailList).all()
以便访问工厂中的应用程序共享的数据库。
我正在使用sqlite进行开发。在current_app_context中，正确分配了数据库：
What is current_app.db? --> <SQLAlchemy engine='sqlite:////Users/me/myproject/tmp/dev.db'>
如何查询数据库中的模型？我如何破译追踪中发生的事情？