我有 2 个对象(从 XML 加载的列表)report
和(在代码中显示如下),我应该分析它们并根据某些条件用0、1、2、3database
标记项目
TransactionResultCode = 0; // SUCCESS (all fields are equivalents: [Id, AccountNumber, Date, Amount])
TransactionResultCode = 1; // Exists in report but Not in database
TransactionResultCode = 2; // Exists in database but Not in report
TransactionResultCode = 3; // Field [Id] are equals but other fields [AccountNumber, Date, Amount] are different.
如果有人能抽出时间建议如何优化某些查询,我会很高兴。下面是代码:
谢谢你!!!
//TransactionResultCode = 0 - SUCCESS
//JOIN on all fields
var result0 = from d in database
from r in report
where (d.TransactionId == r.MovementID) &&
(d.TransactionAccountNumber == long.Parse(r.AccountNumber)) &&
(d.TransactionDate == r.MovementDate) &&
(d.TransactionAmount == r.Amount)
orderby d.TransactionId
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount,
TransactionResultCode = 0
};
//*******************************************
//JOIN on [Id] field
var joinedList = from d in database
from r in report
where d.TransactionId == r.MovementID
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount
};
//Difference report - database
var onlyReportID = report.Select(r => r.MovementID).Except(joinedList.Select(d => d.TransactionId));
//TransactionResultCode = 1 - Not Found in database
var result1 = from o in onlyReportID
from r in report
where (o == r.MovementID)
orderby r.MovementID
select new TransactionList()
{
TransactionId = r.MovementID,
TransactionAccountNumber = long.Parse(r.AccountNumber),
TransactionDate = r.MovementDate,
TransactionAmount = r.Amount,
TransactionResultCode = 1
};
//*******************************************
//Difference database - report
var onlyDatabaseID = database.Select(d => d.TransactionId).Except(joinedList.Select(d => d.TransactionId));
//TransactionResultCode = 2 - Not Found in report
var result2 = from o in onlyDatabaseID
from d in database
where (o == d.TransactionId)
orderby d.TransactionId
select new TransactionList()
{
TransactionId = d.TransactionId,
TransactionAccountNumber = d.TransactionAccountNumber,
TransactionDate = d.TransactionDate,
TransactionAmount = d.TransactionAmount,
TransactionResultCode = 2
};
//*******************************************
var qwe = joinedList.Select(j => j.TransactionId).Except(result0.Select(r => r.TransactionId));
//TransactionResultCode = 3 - Transaction Results are different (Amount, AccountNumber, Date, )
var result3 = from j in joinedList
from q in qwe
where j.TransactionId == q
select new TransactionList()
{
TransactionId = j.TransactionId,
TransactionAccountNumber = j.TransactionAccountNumber,
TransactionDate = j.TransactionDate,
TransactionAmount = j.TransactionAmount,
TransactionResultCode = 3
};