【发布时间】：2012-08-23 23:44:43
【问题描述】：
继我在When is a groupby query evaluated in RavenDB? 的上一个问题之后，我决定将数据完全重组为理论上更易于查询的格式。
现在已经创建了新的数据结构，我正在努力寻找如何查询它。
我花了 30 秒来编写以下 SQL 查询，它给出了我需要的结果：
SELECT GroupCompanyId, AccountCurrency, AccountName, DATEPART(year, Date) AS Year,
(SELECT SUM(Debit) AS Expr1
FROM Transactions AS T2
WHERE (T1.GroupCompanyId = GroupCompanyId) AND (T1.AccountCurrency = AccountCurrency) AND (T1.AccountName = AccountName) AND (DATEPART(year,
Date) < DATEPART(year, T1.Date))) AS OpeningDebits,
(SELECT SUM(Credit) AS Expr1
FROM Transactions AS T2
WHERE (T1.GroupCompanyId = GroupCompanyId) AND (T1.AccountCurrency = AccountCurrency) AND (T1.AccountName = AccountName) AND (DATEPART(year,
Date) < DATEPART(year, T1.Date))) AS OpeningCredits, SUM(Debit) AS Db, SUM(Credit) AS Cr
FROM Transactions AS T1
WHERE (DATEPART(year, Date) = 2011)
GROUP BY GroupCompanyId, AccountCurrency, AccountName, DATEPART(year, Date)
ORDER BY GroupCompanyId, AccountCurrency, Year, AccountName
到目前为止，我得到了如下的 Map/Reduce，Studio 似乎给出了正确的结果 - 即它按日期分解和分组数据。
public Transactions_ByDailyBalance()
{
Map = transactions => from transaction in transactions
select new
{
transaction.GroupCompanyId,
transaction.AccountCurrency,
transaction.Account.Category,
transaction.Account.GroupType,
transaction.AccountId,
transaction.AccountName,
transaction.Date,
transaction.Debit,
transaction.Credit,
};
Reduce = results => from result in results
group result by new
{
result.GroupCompanyId,
result.AccountCurrency,
result.Category,
result.GroupType,
result.AccountId,
result.AccountName,
result.Date,
}
into g
select new
{
GroupCompanyId = g.Select(x=>x.GroupCompanyId).FirstOrDefault(),
AccountCurrency = g.Select(x=>x.AccountCurrency).FirstOrDefault(),
Category=g.Select(x=>x.Category).FirstOrDefault(),
GroupType=g.Select(x=>x.GroupType).FirstOrDefault(),
AccountId = g.Select(x=>x.AccountId).FirstOrDefault(),
AccountName=g.Select(x=>x.AccountName).FirstOrDefault(),
Date=g.Select(x=>x.Date).FirstOrDefault(),
Debit=g.Sum(x=>x.Debit),
Credit=g.Sum(x=>x.Credit)
};
Index(x=>x.GroupCompanyId,FieldIndexing.Analyzed);
Index(x=>x.AccountCurrency,FieldIndexing.Analyzed);
Index(x=>x.Category,FieldIndexing.Analyzed);
Index(x=>x.AccountId,FieldIndexing.Analyzed);
Index(x=>x.AccountName,FieldIndexing.Analyzed);
Index(x=>x.Date,FieldIndexing.Analyzed);
}
}
但是，我不知道如何一次性查询数据。 我需要期初余额和期间余额，所以我最终编写了这个以帐户为参数的查询。从 Oren 的 cmets 到我之前的问题，我将 Linq 与 Lucene 查询混合在一起，重写了查询，我基本上再次以混合查询结束。
尽管我在上面的 SQL 查询中显示我按年份进行过滤，但实际上我需要能够确定任何一天的当前余额。
private LedgerBalanceDto GetAccountBalance(BaseAccountCode account, DateTime periodFrom, DateTime periodTo, string queryName)
{
using (var session = MvcApplication.RavenSession)
{
var query = session.Query<Transactions_ByDailyBalance.Result, Transactions_ByDailyBalance>()
.Where(c=>c.AccountId==account.Id && c.Date>=periodFrom && c.Date<=periodTo)
.OrderBy(c=>c.Date)
.ToList();
var debits = query.Sum(c => c.Debit);
var credits = query.Sum(c => c.Credit);
var ledgerBalanceDto = new LedgerBalanceDto
{
Account = account,
Credits = credits,
Debits = debits,
Currency = account.Currency,
CurrencySymbol = account.CurrencySymbol,
Name = queryName,
PeriodFrom = periodFrom,
PeriodTo = periodTo
};
return ledgerBalanceDto;
}
}
要求的结果：
GroupCompanyId AccountCurrency AccountName Year OpeningDebits OpeningCredits Db Cr
Groupcompanies-2 EUR Customer 1 2011 148584.2393 125869.91 10297.6891 28023.98
Groupcompanies-2 EUR Customer 2 2011 236818.0054 233671.55 50959.85 54323.38
Groupcompanies-2 USD Customer 3 2011 69426.11761 23516.3776 10626.75 0
Groupcompanies-2 USD Customer 4 2011 530587.9223 474960.51 97463.544 131497.16
Groupcompanies-2 USD Customer 5 2011 29542.391 28850.19 4023.688 4231.388
任何建议将不胜感激
杰里米
回复评论
我基本上最终做了几乎相同的事情。实际上，我编写了一个仅在两次点击中执行此操作的索引——一次用于期初余额，另一次用于期间余额。这对于按帐户名称、类别等进行分组几乎是瞬间完成的。
但是我现在的问题是获取个人帐户的每日运行余额。如果我记下帐户和期间的所有数据，这不是问题 - 我可以汇总客户端的余额，但是，当数据被分页时，借方和贷方按日期和 ID 分组，分页跨越日期，所以期初/期末余额不正确。
Page 1
Opening balance until 26/7/12 = 0
25/7/12 Acct1 Db 100 Cr 0 Bal +100 Runn Bal +100
26/7/12 Acct1 Db 100 Cr 0 Bal +100 Runn Bal +200
26/7/12 Acct1 Db 200 Cr 0 Bal +200 Runn Bal +400
Closing balance until 26/7/12 = +400
Page 2
Opening balance until 26/7/12 = +450 (this is wrong - it should be the balance at the end of Page 1, but it is the balance until the 26/7/12 - i.e. includes the first item on Page 2)
26/7/12 Acct1 Db 50 Cr 0 Bal +50 Runn Bal +500 (should be +450)
27/7/12 Acct1 Db 60 Cr 0 Bal +60 Runn Bal +560 (should be +510)
我只是想不出一个算法来处理这个问题。
有什么想法吗？
【问题讨论】：
标签： ravendb