SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees   .Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employees select new {e.LoginID, e.JobTitle} Employees   .Select…

SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees   .Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employees select new {e.LoginID, e.JobTitle} Employees   .Select…

SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees   .Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employees select new {e.LoginID, e.JobTitle} Employees   .Select…

从网上收藏的复杂Linq语句写法 1.case when: 原型: sql原型: SELECT ProductID, Name, Color, CASE WHEN Color = 'Red' THEN StandardCost WHEN Color = 'Black' THEN StandardCost + 10 ELSE ListPrice END Price FROM SalesLT.Product Linq代码: Products.Select(P => new { ID = P.Prod…

如果你熟悉SQL语句,当使用LINQ时,会有似曾相识的感觉.但又略有不同.下面是SQL和LINQ,Lambda语法对照图 SQL LINQ Lambda SELECT * FROM HumanResources.Employee from e in Employees select e Employees.Select (e => e) SELECT e.LoginID, e.JobTitle FROM HumanResources.Employee AS e from e in Employe…

出错代码如下:static String u = "user";static String p = "psw";static String url = "jdbc:oracle:thin:@localhost:1521:db_name";con = DriverManager.getConnection(url, u, p); statement = con.createStatement();String query1="select…

ADO方式,VC调用Execute执行INSERT INTO插入变量SQL语句的写法 有些情况下,SQL SERVER 2008r2中需要保存float,int类型的数据,当C 中的变量为double类型时,先格式化为Cstring格式,再组合成SQL语句. 对应的C 插入语句写法如下: [cpp] view plain copy     m_pConnection->Execute(_bstr_t("INSERT INTO Gps(GPSTIME,S1XZWZ,S1X,S1Y,S1HZJ…

https://www.cnblogs.com/johnblogs/p/6006867.html DataTable ds = new DataTable(); //1.lamda 表达式写法(推荐) var result = ds.AsEnumerable().GroupBy(s => new{Year = s.Field<int>("Year"), Month = s.Field<int>("Month"), Day = s.Fie…

string[] arID = { "0001", "0002" }; var dict = this.service.GetMyList(m => arID.Contains(m.ID))//等同于SQL里的 id in('0001','0002') .Select(m => new { m.ID, m.Name,m.Age }) .ToDictionary(s => s.ID);//以ID作为key,{ID,Name,Age}作为Value,转…

1.查询Student表中的所有记录的Sname.Ssex和Class列. SQL:select sname,ssex,class from Students linq:from s in Students select new{s.sname,s.ssex,s.class} lambda:Students.select(s=>new{sname=s.sname,ssex=s.ssex,class=s.class}) 2.查询教师所有的单位即不重复的Depart列. SQL:select dis…