我正在进行查询(见下文),但我不知道如何从选择中检索所有数据。
var model = new dbContext();
var query = from mp in model.matiere_premiere join req in (from stk in model.stock_mp
join ms in model.matiere_premiere
on stk.matiere_premiere_code equals
ms.code
where stk.date <= DateTime.Today
orderby stk.date descending
select new new { stk.qte, stk.matiere_premiere_code })
on mp.code equals req.matiere_premiere_code
group mp by new { mp.code } into grp
orderby grp.Key
select new
{
grp.Key,
grp.First().designation,
grp.Last().frns
};
等效的sql查询是:
SELECT matiere_premiere.code,matiere_premiere.designation,
"matiere_premiere.unite, matiere_premiere.frns ,IF(ISNULL(REQ.qte), '0.00', REQ.qte) AS qte
FROM matiere_premiere LEFT JOIN (SELECT qte,matiere_premiere_code FROM stock_mp
JOIN matiere_premiere ON matiere_premiere.code = matiere_premiere_code
WHERE DATE <= CURRENT_DATE() ORDER BY DATE DESC)
AS REQ ON REQ.matiere_premiere_code = matiere_premiere.code
GROUP BY matiere_premiere.code ORDER BY matiere_premiere.code
答案 0 :(得分:0)
很简单,该组也是一个枚举器,所以你应该返回
select grp;
然后,对于每个组,您可以执行值的预测
foreach(var group in query)
{
Console.WriteLine("Key: " + group.Key);
foreach(var v in group)
{
Console.WriteLine("Value: " + v.Property);
}
}