VS2008开发-Linq to sql
首先创建一个C#控制台工程LINQToSQL，然后打开服务浏览器，单击右键，创建数据库Student
数据库创建数据库完成后，创建表stu_info
在解决方案管理器中击右键，选择添加新项，在弹出窗口中选择Linq to sql class
创建完成后，在服务管理器中，拖到刚创建的表Stu_info到Student.dbml中，
打开Program.cs文件，键入如下代码：
1
using
System;
2
using
System.Collections.Generic;
3
using
System.Linq;
4
using
System.Text;
5
namespace
LINQToSQL
6
{
7
class
Program
8
{
9
static
void
Main(
string
[] args)
10
{
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//
插入测试
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//
Stu_Info s = new Stu_Info();
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//
s.Stu_Name = \"萧秋水\";
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//
s.Stu_Age = 20;
15
//
StudentList.Insert_Student(s);
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//
Console.WriteLine(\"插入成功！\");
17
18
//
筛选测试
19
20
//
IEnumerable students = StudentList.Select_Students();
21
//
foreach (var stu in students)
22
//
{
23
//
Console.WriteLine(stu.Stu_Name);
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//
}
25
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//
删除测试
27
28
//
StudentList.Del_Students(1);
29
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//
更新测试
31
32
/*
Stu_Info s = new Stu_Info();
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s.Stu_Name = \"燕狂徒\";
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s.Stu_Age = 60;
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StudentList.Update_Student(s);
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*/
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}
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}
39
public
class
StudentList
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{
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///
42
///
插入数据
43
///
44
///
45
///
46
public
static
bool
Insert_Student(Stu_Info stu)
47
{
48
StudentDataContext stu_DataContext
=
new
StudentDataContext();
49
try
50
{
51
stu_DataContext.Stu_Infos.InsertOnSubmit(stu);
52
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stu_DataContext.SubmitChanges();
54
return
true
;
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}
56
catch
(Exception e)
57
{
58
Console.WriteLine(e);
59
return
false
;
60
}
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}
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///
63
///
筛选数据
64
///
65
///
66
public
static
IEnumerable Select_Students()
67
{
68
StudentDataContext stu_DataContext
=
new
StudentDataContext();
69
try
70
{
71
var s
=
from stu
in
stu_DataContext.Stu_Infos select stu;
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return
s;
73
74
//
string sql = \"select * from Stu_Info\";
75
//
Object[] obj = new Object { };
76
//
stu_DataContext.Log = Console.Out;
77
//
return stu_DataContext.ExecuteQuery(s.ToString(),obj);
78
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}
80
catch
(Exception e)
81
{
82
Console.WriteLine(e);
83
return
null
;
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}
85
86
}
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///
88
///
删除数据
89
///
90
///
91
///
92
public
static
bool
Del_Students(
int
id)
93
{
94
StudentDataContext stu_DataContext
=
new
StudentDataContext();
95
try
96
{
97
var s
=
from stu
in
stu_DataContext.Stu_Infos
where
stu.Stu_ID
==
1
select stu;
98
if
(s.Count()
>
0
)
99
{
100
stu_DataContext.Stu_Infos.DeleteOnSubmit(s.First());
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stu_DataContext.SubmitChanges();
102
}
103
104
return
true
;
105
106
}
107
catch
(Exception e)
108
{
109
Console.WriteLine(e);
110
return
false
;
111
}
112
113
}
114
///
115
///
更新数据
116
///
117
///
118
///
119
public
static
bool
Update_Student(Stu_Info stu)
120
{
121
StudentDataContext stu_DataContext
=
new
StudentDataContext();
122
try
123
{
124
var s
=
from student
in
stu_DataContext.Stu_Infos
where
student.Stu_ID
==
2
select student;
125
126
foreach
(Stu_Info newStu
in
s)
127
{
128
newStu.Stu_Name
=
stu.Stu_Name ;
129
newStu.Stu_Age
=
stu.Stu_Age;
130
}
131
132
stu_DataContext.SubmitChanges();
133
134
return
true
;
135
}
136
catch
(Exception e)
137
{
138
Console.WriteLine(e);
139
return
false
;
140
}
141
}
142
}
143
}