#javob
Connectionni MainDB objectni initialize qilayotganda ochmang.
Hozir siz MainDBdan object olganda connection ochayapsiz.
Bir method orqali query yuborganda with context manager orqali connectiondan foydalanib, keyin uni yopib chiqib ketayapsiz.
Keyingi safar query yubormoqchi bo'lganingizda connection yopilgani sabab error berayapti.
Yoki har bitta query uchun alohida connection ishlating, yoki (agar bitta connectionni doim ishlatmoqchi bo'lsangiz) with ishlatmang, sababi u kod execute bo'lganidan keyin connectionni yopadi.
Post #189
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Engineering Notes Photo
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