在Python中,哪一種效率比其他效率更高。我的要求是有一個連接,直到我們關閉應用程序。Python中的光標Vs連接
我有兩個類,一個是讓連接/光標,並使用我能夠獲取和獲取我的服務中的數據。在python :)
一個DBConnection的類繼MVC
import pyodbc
class Connection:
def getconnection(self):
conn = pyodbc.connect('Driver={SQL Server};Server=.\SQLEXPRESS;Database=School;Trusted_Connection=yes;')
print("Connection Established")
#cursor = conn.cursor()
return conn
def getcursor(self):
conn = pyodbc.connect('Driver={SQL Server};Server=.\SQLEXPRESS;Database=School;Trusted_Connection=yes;')
print("Connection Established")
cursor = conn.cursor()
return cursor
和一個服務類
import Connection
import pyodbc
class StudentDataService:
connection = Connection.Connection().getconnection()
cursor = Connection.Connection().getcursor()
def getstudentdata(self):
print("In method getStudentdata()")
try:
row = self.connection.execute('select * from StudentGrade')
studentList = list(row)
return studentList
except pyodbc.DatabaseError as err:
print("Error Occurred while fetching Student Records", err)
return None
finally:
self.connection.close()
def getcursorstudentdata(self):
print("In method getcursorstudentdata()")
try:
row = self.cursor.execute('select * from StudentGrade')
studentList = list(row)
return studentList
except pyodbc.DatabaseError as err:
print("Error Occurred while fetching Student Records", err)
return None
finally:
self.cursor.close()
stu = StudentDataService()
print(stu.getstudentdata())
print("++++++++++++++++++++++++++++++++")
print(stu.getcursorstudentdata())
無一不是給我結果
Connection Established
Connection Established
In method getStudentdata()
[(1, 2021, 2, Decimal('4.00')), (2, 2030, 2, Decimal('3.50')),... ]
++++++++++++++++++++++++++++++++
In method getcursorstudentdata()
[(1, 2021, 2, Decimal('4.00')), (2, 2030, 2, Decimal('3.50')),... ]
所以我的困惑是,這一個使用?