Question

等同于代码优先的实体框架中的代码

INSERT INTO TableA (a,b)
SELECT a,b
FROM TableB
WHERE a=10

Answer 1

我相信您尝试根据条件从TableB中选择几列，然后将所有这些对象添加到TableA，可以执行以下操作：

//Create list of TableA objects after selecting and projecting from TableB
var list = db.TableB.Where(t => t.a == 10)
                    .Select(r => new TableA() { A = r.a, B = r.b })
                    .ToList();
//Add those items to TableA through DataContext
foreach (var item in list)
    db.TableA.AddObject(item);
//Call Save
db.SaveChanges();

在代码优先的实体框架中插入/ sql等效的sql代码

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