The official document:
http://www.codeisbug.com/Doc/8/1159
二: 返回指定列匿名类集合
var data = db.Queryable<Student>()
.Select(f => new
{
f.ID,
f.Name
}).ToList();
/*
生成SQL:
SELECT [ID] AS [ID] , [Name] AS [Name] FROM [Student]
其它数据库类似, 不一一列举
*/
13
1
Two : Returns the specified column anonymous class collection
2
3
var data = db.Queryable<Student>()
4
.Select(f => new
5
{
6
f.ID,
7
f.Name
8
}).ToList();
9
/*
10
Generate SQL:
11
SELECT [ID] AS [ID] , [Name] AS [Name] FROM [Student]
12
Similar to other databases, not enumerate
13
*/
三: 返回单个列集合
//返回值为List<string>
List<string> data = db.Queryable<Student>().Select(f => f.Name).ToList();
/*
生成SQL:
SELECT [Name] FROM [Student]
其它数据库类似, 不一一列举
*/
1
Three : return a single column set
2
3
// the return value List <string>
4
List<string> data = db.Queryable<Student>().Select(f => f.Name).ToList();
5
/*
6
Generate SQL:
7
SELECT [Name] FROM [Student]
8
Similar to other databases, not enumerate
9
*/