Linq 實現sql中的not in和in條件查詢
T-SQL的IN：
Select ProductID, ProductName, CategoryID
From dbo.Products
Where CategoryID
in
(1, 2)
T-SQL的NOT IN：
Select ProductID, ProductName, CategoryID
From dbo.Products
Where CategoryID not
in
(1, 2)
Or
Select ProductID, ProductName, CategoryID
From dbo.Products
Where not CategoryID
in
(1, 2)
LINQ的IN：
var
queryResult =
from
p
in
db.Products
where
(
new
int
?[] {1,2}).Contains(p.CategoryID)
select
p;
LINQ的IN解析成SQL：
SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued]
FROM [dbo].[Products]AS [t0]
WHERE [t0].[CategoryID] IN (@p0, @p1)
LINQ的NOT IN：
var
queryResult =
from
p
in
db.Products
where
! (
new
int
?[] {1,2}).Contains(p.CategoryID)
select
p;
LINQ的NOT IN解析成SQL：
SELECT [t0].[ProductID], [t0].[ProductName], [t0].[SupplierID], [t0].[CategoryID], [t0].[QuantityPerUnit], [t0].[UnitPrice], [t0].[UnitsInStock], [t0].[UnitsOnOrder], [t0].[ReorderLevel], [t0].[Discontinued]
FROM [dbo].[Products]AS [t0]
WHERE NOT [t0].[CategoryID] IN (@p0, @p1)