[英]sqlalchemy and how to count row
I have the following code: 我有以下代码:
query = self.dbObj.session.query(MaterialsTable)
rowCounter = self.dbObj.session.query(MaterialsTable)
for attr , val in interfaceCodesObject.filterNameDict.items():
query = query.filter(and_(getattr(MaterialsTable,attr).like("%%%s%%" % val)))
rowCounter = rowCounter.filter(and_(getattr(MaterialsTable,attr).like("%%%s%%" % val))).count()
query.all()
When i use mutiple field, i get the following traceback: 当我使用多字段时,我得到以下回溯:
Traceback (most recent call last):
File "/home/mohsen/codes/amlak/amlak/src/ui/materialsFindFrame.py", line 202, in <lambda>
QtCore.QObject.connect(self.pushButtonSearch, QtCore.SIGNAL(_fromUtf8("clicked()")), lambda: self.interfaceCodesConstructor.responseToRequestForData(self))
File "/home/mohsen/codes/amlak/amlak/src/ui/interface/interface.py", line 109, in responseToRequestForData
self.materialsObejct.findData(self.objectSearchMaterials,self)
File "/home/mohsen/codes/amlak/amlak/src/materials/materials.py", line 133, in findData
rowCounter = rowCounter.filter(and_(getattr(MaterialsTable,attr).like("%%%s%%" % val))).count()
AttributeError: 'long' object has no attribute 'filter'
But when i use just one field it use rowCounter as integer and real return. 但是,当我只使用一个字段时,它将rowCounter用作整数和实际返回值。
My question is , how can i adapt it with multiple field?Such as : Where name = 'barak' and id != 3
But one filed such as : Where name = 'barak'
我的问题是 ,如何适应多个字段?例如:
Where name = 'barak' and id != 3
但有一个文件如: Where name = 'barak'
Do you just want to get the count of final result? 您是否只想获得最终结果的计数? In that case, in fact, you just need only one
query
object instead of both query
and rowCounter
. 实际上,在那种情况下,您只需要一个
query
对象,而不是query
和rowCounter
。
query = self.dbObj.session.query(MaterialsTable)
for attr , val in interfaceCodesObject.filterNameDict.items():
query = query.filter(and_(getattr(MaterialsTable,attr).like("%%%s%%" % val)))
# all result rows
query.all()
# count of rows
rowCounter = query.count()
Hope this helps. 希望这可以帮助。
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