LINQ TO SQL Null 查询 自己留用
来源:互联网 发布:演示demo制作软件 编辑:程序博客网 时间:2024/05/19 01:31
LINQ TO SQL Null 查询
链接:http://blog.csdn.net/q107770540/article/details/7348384
- SELECT *
- FROM [Orders] AS [t0]
- WHERE ([t0].[ShippedDate]) IS NULL
v 方法一:
- from o in Orders
- where o.ShippedDate==null
- select o
对应的Lamda表达式为:
- Orders
- .Where (o => (o.ShippedDate == (DateTime?)null))
对应的SQL语句为:
- SELECT [t0].[OrderID], [t0].[CustomerID], [t0].[EmployeeID], [t0].[OrderDate], [t0].[RequiredDate], [t0].[ShippedDate], [t0].[ShipVia], [t0].[Freight], [t0].[ShipName], [t0].[ShipAddress], [t0].[ShipCity], [t0].[ShipRegion], [t0].[ShipPostalCode], [t0].[ShipCountry]
- FROM [Orders] AS [t0]
- WHERE [t0].[ShippedDate] IS NULL
v 方法二:
- from o in Orders
- where Nullable<DateTime>.Equals(o.ShippedDate,null)
- select o
对应的Lamda表达式为:
- Orders
- .Where (o => Object.Equals (o.ShippedDate, null))
对应的SQL语句为:
- SELECT [t0].[OrderID], [t0].[CustomerID], [t0].[EmployeeID], [t0].[OrderDate], [t0].[RequiredDate], [t0].[ShippedDate], [t0].[ShipVia], [t0].[Freight], [t0].[ShipName], [t0].[ShipAddress], [t0].[ShipCity], [t0].[ShipRegion], [t0].[ShipPostalCode], [t0].[ShipCountry]
- FROM [Orders] AS [t0]
- WHERE [t0].[ShippedDate] IS NULL
v 方法三:
- from o in Orders
- where !o.ShippedDate.HasValue
- select o
对应的Lamda表达式为:
- Orders
- .Where (o => !(o.ShippedDate.HasValue))
对应的SQL语句为:
- SELECT [t0].[OrderID], [t0].[CustomerID], [t0].[EmployeeID], [t0].[OrderDate], [t0].[RequiredDate], [t0].[ShippedDate], [t0].[ShipVia], [t0].[Freight], [t0].[ShipName], [t0].[ShipAddress], [t0].[ShipCity], [t0].[ShipRegion], [t0].[ShipPostalCode], [t0].[ShipCountry]
- FROM [Orders] AS [t0]
- WHERE NOT ([t0].[ShippedDate] IS NOT NULL)
v 方法四:
- from o in Orders
- where o.ShippedDate.Value==(DateTime?)null
- select o
对应的Lamda表达式为:
- Orders
- .Where (o => ((DateTime?)(o.ShippedDate.Value) == (DateTime?)null))
对应的SQL语句为:
- SELECT [t0].[OrderID], [t0].[CustomerID], [t0].[EmployeeID], [t0].[OrderDate], [t0].[RequiredDate], [t0].[ShippedDate], [t0].[ShipVia], [t0].[Freight], [t0].[ShipName], [t0].[ShipAddress], [t0].[ShipCity], [t0].[ShipRegion], [t0].[ShipPostalCode], [t0].[ShipCountry]
- FROM [Orders] AS [t0]
- WHERE ([t0].[ShippedDate]) IS NULL
v 方法五:
- from o in Orders
- where System.Data.Linq.SqlClient.SqlMethods.Equals(o.ShippedDate.Value,null)
- select o
对应的Lamda表达式为:
- Orders
- .Where (o => Object.Equals (o.ShippedDate.Value, null))
对应的SQL语句为:
- SELECT [t0].[OrderID], [t0].[CustomerID], [t0].[EmployeeID], [t0].[OrderDate], [t0].[RequiredDate], [t0].[ShippedDate], [t0].[ShipVia], [t0].[Freight], [t0].[ShipName], [t0].[ShipAddress], [t0].[ShipCity], [t0].[ShipReg
0 0
- LINQ TO SQL Null 查询 自己留用
- LINQ TO SQL Null 查询
- LINQ TO SQL Null 查询 .
- LINQ TO SQL Null 查询
- LINQ TO XML查询结果null 解决方法
- LINQ系列:LINQ to SQL Select查询
- LINQ to SQL查询句法
- Linq to SQL 查询Tips
- LINQ to SQL 简单查询
- LINQ to SQL异步查询
- Linq to sql :查询句法
- Linq to sql查询句法
- Linq to SQL查询数据库
- LINQ to SQL查询和SQL命令
- LINQ to SQL查询和SQL命令
- linq To SQl之多表联合查询
- Linq to sql(四):查询句法
- Linq To SQL动态查询 之 IQueryBuilder
- TIMIT语音库-----下载和matlab读取
- Http 的状态码
- H.264 Profile、Level、Encoder三张简图
- Windows Server 2008 下Oracle 11g 定时备份任务
- C++GUIQT编程
- LINQ TO SQL Null 查询 自己留用
- 在C#中在服务器上打包压缩文件,并下载
- IOS NSConditionLock 条件锁 NSCondition 断言
- Android MediaPlayer 代理 完成缓存、预缓存
- Linux 下timer的使用方法
- ORACLE的高级复制资料
- 网络
- ListView中CovertView复用详解
- 201312文摘