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[英]PostgreSQL/Python: insert new row only if doesn't exists already
[英]return the row only if exists in python
我只想在特定行存在但無法實現的情況下返回值。在這里,我嘗試了什么
def CurrentRunning(UserId):
cursor = connection.cursor()
cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivity] @UserId=%s', (UserId,))
result_set = cursor.fetchall()
data= []
data.append({
'TaskId':row[0],
'Value1':row[1],
'Value2' :row[2],
'SelectedTeam':0 if row[3] is exists else row[3],
'Level1':'0' if row[4] is exists else row[4],
'Level2':'0' if row[5] is exists else row[5],
'Level3':'0' if row[6] is exists else row[6],
'Level4':'0' if row[7] is exists else row[7],
'TotalVolume':'0' if row[8] is exists else row[8],
'ReturnDate':'0' if row[9] is exists else row[9],
})
print('Activity')
return Response(data)
您必須修改您的 if 語句:
def CurrentRunning(UserId):
cursor = connection.cursor()
cursor.execute('EXEC [dbo].[sp_GetCurrentRunningActivity] @UserId=%s', (UserId,))
result_set = cursor.fetchall()
data= []
data.append({
'TaskId':row[0],
'Value1':row[1],
'Value2' :row[2],
'SelectedTeam': row[3] if row[3] is not None else '0',
'Level1': row[4] if row[4] is not None else '0',
'Level2': row[5] if row[5] is not None else '0',
'Level3': row[6] if row[6] is not None else '0'
...
...
等等...
編碼
val = row[3] if row[3] is not None else '0'
當 row[3] 為 None 時導致 val == '0',否則 val 將等於 row[3]。
如果您不確定 row[3] 是否存在(可能是因為索引 3 大於 len(row)),您可以添加額外的檢查:
val = row[3] if ((row is not None) and (len(row)>3) and (row[3] is not None)) else '0'
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