我有一个sql db-connection,除其他外,它具有更新(相互说成4个)相互依赖的表的功能。我最初在一个函数updates_all_in_one
中一起拥有所有查询,效果很好。
我现在正试图将其分解为拆分函数(因为可能需要调用部分更新并避免重写相同的代码),例如update1
... update4
。
但是,我注意到当我使用拆分并在函数updates_call_subfunc
中调用它们时,恰好在调用update1
之后,似乎该函数的更新没有就位(因此遇到了依赖关系出现问题,因为未应用update1),并且如果从一个功能到第二个功能的连接器类无法通信。
我在线上阅读了一些内容,似乎连接是否是一个类的一部分,它保持打开/共享状态,但是我不明白为什么顺序更新失败。
谢谢
import pyodbc as mdb
class DbHandlerSQL(object):
def __init__(self, dbHost, dbName, dbUser, dbPass):
if os.name=='posix':
connStr = ('Driver={ODBC Driver 13 for SQL Server};Server='+ dbHost +'; Database='+dbName+';UID='+dbUser+';PWD='+dbPass)
else:
connStr = ('Driver={SQL Server};Server='+ dbHost +'; Database='+dbName+';UID='+dbUser+';PWD='+dbPass)
self.conn = pyodbc.connect(connStr)
self.conn.timeout = 200
self.dbCursor = self.conn.cursor()
#==================================================================
def updates_all_in_one(self,myname, mytype, mysource, local_id):
try:
q1 = " update table1 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q1, (myname, mytype, mysource, local_id) )
q2 = " update table2 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q2, (myname, mytype, mysource, local_id) )
q3 = " update table3 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q3, (myname, mytype, mysource, local_id) )
q4 = " update table4 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q4, (myname, mytype, mysource, local_id) )
except:
raise Exception('problem during uploading')
self.dbCursor.commit()
#==================================================================
def updates_call_subfunc(self,myname, mytype, mysource, local_id):
self.update1(myname, mytype, mysource, local_id)
' Test 1
self.update2(myname, mytype, mysource, local_id)
' Test 2
self.update3(myname, mytype, mysource, local_id)
' Test 3
self.update4(myname, mytype, mysource, local_id)
' Test 4
self.dbCursor.commit()
#==================================================================
def update1(self,myname, mytype, mysource, local_id):
q1 = " update table1 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q1, (myname, mytype, mysource, local_id) )
#==================================================================
def update2(self,myname, mytype, mysource, local_id):
q2 = " update table2 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q2, (myname, mytype, mysource, local_id) )
#==================================================================
def update3(self,myname, mytype, mysource, local_id):
q3 = " update table3 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q3, (myname, mytype, mysource, local_id) )
#==================================================================
def update4(self,myname, mytype, mysource, local_id):
q4 = " update table4 \
set name=? , type=?, source=? \
where local_id=?"
self.dbCursor.execute(q4, (myname, mytype, mysource, local_id) )