一个专门实现访问sql server数据库增删改查的操作代码，分享给大家，具体内容如下
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.windows.forms;
using system.data;
using system.data.sqlclient;
namespace windowsformsapplication1
{
public partial class form1 : form
{
public form1()
{
initializecomponent();
}
//查询
private void button1_click(object sender, eventargs e)
{
string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";//定义数据库连接参数
sqlconnection myconnection = new sqlconnection(myconn);//定义一个数据连接实例
sqlcommand mycommand = new sqlcommand("select * from 图书借阅", myconnection); //定义一个数据库操作指令
sqldataadapter selectadapter = new sqldataadapter();//定义一个数据适配器
selectadapter.selectcommand = mycommand;//定义数据适配器的操作指令
dataset mydataset = new dataset();//定义一个数据集
myconnection.open();//打开数据库连接
selectadapter.selectcommand.executenonquery();//执行数据库查询指令
myconnection.close();//关闭数据库
selectadapter.fill(mydataset);//填充数据集
datagrid1.datasource = mydataset.tables[0];
//datagrid1.databind();//将数据表格用数据集中的数据填充
}
//添加
private void button2_click(object sender, eventargs e)
{
string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
sqlconnection myconnection = new sqlconnection(myconn);
string myinsert = "insert into 图书借阅 (图书编号,读者编号,续借次数) values ('" + convert.tostring(textbox2.text) + "','" +
convert.tostring(textbox3.text)+ "','"+convert.toint32(textbox4.text)+ "')";
sqlcommand mycommand = new sqlcommand(myinsert, myconnection);
try//异常处理
{
myconnection.open();
mycommand.executenonquery();
myconnection.close();
}
catch (exception ex)
{
messagebox.show(ex.message);
}
}
//更新
private void button3_click(object sender, eventargs e)
{
string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
sqlconnection myconnection = new sqlconnection(myconn);
string myupdate = "update 图书借阅 set 操作员='" + textbox2.text + "'" + " where 借阅编号=" + "'" + textbox1.text + "'";
sqlcommand mycommand = new sqlcommand(myupdate, myconnection);
try
{
myconnection.open();
mycommand.executenonquery();
myconnection.close();
textbox1.text = "";
}
catch (exception ex)
{
messagebox.show(ex.message);
}
}
//删除
private void button4_click(object sender, eventargs e)
{
string myconn = "server=127.0.0.1;uid=sa;pwd=123654;database=libbook;trusted_connection=no";
sqlconnection myconnection = new sqlconnection(myconn);
string mydelete = "delete from 图书借阅 where 借阅编号=" + textbox1.text;
sqlcommand mycommand = new sqlcommand(mydelete, myconnection);
try
{
myconnection.open();
mycommand.executenonquery();
myconnection.close();
textbox1.text = "";
}
catch (exception ex)
{
messagebox.show(ex.message);
}
}
}
}
|
数据库如下；
winform中查询成功；
插入时，因为借阅编号为自增，不能插入值，会自己生成；
更新，外键冲突；插入的图书编号为000999，无此图书，故出错；
插入成功；
更新操作员为"王老师"；
删除借阅编号为31的记录；
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。