winform中利用ado.net实现对单表的增删改查的详细例子，具体如下：
1.前言：
运行环境：vs2013+sql2008+windows10
程序界面预览：
使用的主要控件：datagridview和menustrip等。
2.功能具体介绍：
1.首先，我们要先实现基本的数据操作，增删改查这几个操作。
（1）先定义一个数据库操作的公共类：
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using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using system.data;
using system.configuration;
using system.data.sqlclient;
using system.security.cryptography;
namespace data
{
class sqldesigner
{
private static string connstr = configurationmanager.connectionstrings["data"].connectionstring;
/// <summary>
/// 返回受影响的数据行数
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static int executenoquery(string sql)
{
using (sqlconnection conn=new sqlconnection(connstr))
{
conn.open();
using (sqlcommand cmd=conn.createcommand())
{
cmd.commandtext = sql;
return cmd.executenonquery();
}
}
}
/// <summary>
/// 返回一个数据集
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
public static dataset executedataset(string sql)
{
using (sqlconnection xonn=new sqlconnection(connstr))
{
xonn.open();
using (sqlcommand cmd = xonn.createcommand())
{
cmd.commandtext = sql;
sqldataadapter adapter = new sqldataadapter(cmd);
dataset dataset = new dataset();
adapter.fill(dataset);
return dataset;
}
}
}
public static object executescalar(string sql)
{
using (sqlconnection conn=new sqlconnection(connstr))
{
conn.open();
using (sqlcommand cmd=conn.createcommand())
{
cmd.commandtext = sql;
return cmd.executescalar();
}
}
}
/// <summary>
/// md5加密
/// </summary>
/// <param name="strpwd"></param>
/// <returns></returns>
public static string getmd5(string strpwd)
{
string pwd = "";
//实例化一个md5对象
md5 md5 = md5.create();
// 加密后是一个字节类型的数组
byte[] s = md5.computehash(encoding.utf8.getbytes(strpwd));
//翻转生成的md5码
s.reverse();
//通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
//只取md5码的一部分，这样恶意访问者无法知道取的是哪几位
for (int i = 3; i < s.length - 1; i++)
{
//将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（x）则格式后的字符是大写字符
//进一步对生成的md5码做一些改造
pwd = pwd + (s[i] < 198 ? s[i] + 28 : s[i]).tostring("x");
}
return pwd;
}
}
}
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（2）运用建立的公共类，进行数据库的操作：
a.数据查询：
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ds = sqldesigner.executedataset("select * from dtuser");
dt = ds.tables[0];
datagridview1.datasource = dt;
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b.数据添加
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i = sqldesigner.executenoquery("insert into dtuser(uid,uname,pwd,uflag)values('" + textbox1.text + "','" + textbox2.text + "','" +textbox3.text+ "','" + textbox4.text + "')");
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c.数据删除
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string currentindex = datagridview1.currentrow.cells[0].value.tostring();
i = sqldesigner.executenoquery("delete from dtuser where uid='" + currentindex + "'");
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d.数据修改
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i = sqldesigner.executenoquery("update dtrole set rname='" + textbox2.text + "',flag='" + textbox3.text + "'where rid='" + textbox1.text + "'");
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e.一些细节
这里，我们修改一下添加数据，让添加的数据变成字符串的形式，也就是加密操作：
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string str = sqldesigner.getmd5(textbox3.text.trim());
i = sqldesigner.executenoquery("insert into dtuser(uid,uname,pwd,uflag)values('" + textbox1.text + "','" + textbox2.text + "','" + str + "','" + textbox4.text + "')");
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（3）datagridview控件：
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//绑定数据源
datagridview1.datasource = dt;
//自动适应列宽
datagridview1.columns[1].autosizemode = datagridviewautosizecolumnmode.allcells;
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3.代码仅供参考：
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using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
namespace data
{
public partial class form1 : form
{
public form1()
{
initializecomponent();
}
dataset ds = new dataset();
datatable dt = new datatable();
private void textboxnull()
{
textbox1.text = "";
textbox2.text = "";
textbox3.text = "";
textbox4.text = "";
}
private void 用户toolstripmenuitem_click(object sender, eventargs e)
{
textboxnull();
ds = sqldesigner.executedataset("select * from dtuser");
dt = ds.tables[0];
datagridview1.datasource = dt;
labelshow();
}
private void 角色toolstripmenuitem_click(object sender, eventargs e)
{
textboxnull();
ds = sqldesigner.executedataset("select *from dtrole");
dt = ds.tables[0];
datagridview1.datasource = dt;
label4.text = "none";
textbox4.text = "none";
labelshow();
}
private void 对象toolstripmenuitem_click(object sender, eventargs e)
{
textboxnull();
ds = sqldesigner.executedataset("select * from dtfunction");
dt = ds.tables[0];
datagridview1.datasource = dt;
labelshow();
}
private void 帮助toolstripmenuitem_click(object sender, eventargs e)
{
textboxnull();
ds = sqldesigner.executedataset("select * from help");
dt = ds.tables[0];
datagridview1.datasource = dt;
datagridview1.columns[1].autosizemode = datagridviewautosizecolumnmode.allcells;
}
//双击datagridview1
private void datagridview1_celldoubleclick(object sender, datagridviewcelleventargs e)
{
string index = datagridview1.currentrow.cells[0].value.tostring();
if (label1.text == "uid")
{
ds = sqldesigner.executedataset("select *from dtuser where uid='" + index + "'");
dt = ds.tables[0];
datarow row = dt.rows[0];
textbox1.text = row["uid"].tostring();
textbox2.text = row["uname"].tostring();
textbox3.text = row["pwd"].tostring();
textbox4.text = row["uflag"].tostring();
}
if (label1.text == "rid")
{
ds = sqldesigner.executedataset("select *from dtrole where rid='" + index + "'");
dt = ds.tables[0];
datarow row = dt.rows[0];
textbox1.text = row["rid"].tostring();
textbox2.text = row["rname"].tostring();
textbox3.text = row["flag"].tostring();
textbox4.text = "none";
}
if (label1.text == "fid")
{
ds = sqldesigner.executedataset("select *from dtfunction where fid='" + index + "'");
dt = ds.tables[0];
datarow row = dt.rows[0];
textbox1.text = row["fid"].tostring();
textbox2.text = row["fname"].tostring();
textbox3.text = row["flag"].tostring();
textbox4.text = row["uflag"].tostring();
}
}
private void labelshow()
{
label1.text = datagridview1.columns[0].headertext;
label2.text = datagridview1.columns[1].headertext;
label3.text = datagridview1.columns[2].headertext;
try
{
label4.text = datagridview1.columns[3].headertext;
}
catch (exception)
{
label4.text = "none";
}
}
private void btn_add_click(object sender, eventargs e)
{
int i = 0;
if (label1.text=="uid")
{
string str = sqldesigner.getmd5(textbox3.text.trim());
i = sqldesigner.executenoquery("insert into dtuser(uid,uname,pwd,uflag)values('" + textbox1.text + "','" + textbox2.text + "','" + str + "','" + textbox4.text + "')");
}
else if (label1.text == "rid")
{
i = sqldesigner.executenoquery("insert into dtrole(rid,rname,flag)values('" + textbox1.text + "','" + textbox2.text + "','" + textbox3.text + "')");
}
else
{
try
{
i = sqldesigner.executenoquery("insert into dtfunction(fid,rid,uid,uflag)values('" + textbox1.text + "','" + textbox2.text + "','" + textbox3.text + "','" + textbox4.text + "')");
}
catch (exception)
{
messagebox.show("添加失败");
}
}
if (i > 0)
{
messagebox.show("添加成功");
}
else
{
messagebox.show("添加失败");
}
}
private void btn_del_click(object sender, eventargs e)
{
int i = 0;
string currentindex = datagridview1.currentrow.cells[0].value.tostring();
if (label1.text=="uid")
{
i = sqldesigner.executenoquery("delete from dtuser where uid='" + currentindex + "'");
}
else if (label1.text=="fid")
{
i = sqldesigner.executenoquery("delete from dtfunction where fid='" + currentindex + "'");
}
else
{
i = sqldesigner.executenoquery("delete from dtrole where rid='" + currentindex + "'");
}
if (i > 0)
{
messagebox.show("删除成功");
}
else
{
messagebox.show("删除失败");
}
}
private void btn_update_click(object sender, eventargs e)
{
int i = 0;
if (label1.text == "rid")
{
i = sqldesigner.executenoquery("update dtrole set rname='" + textbox2.text + "',flag='" + textbox3.text + "'where rid='" + textbox1.text + "'");
}
if (label1.text == "uid")
{
i = sqldesigner.executenoquery("update dtuser set uname='" + textbox2.text + "',pwd='" + textbox3.text + "',uflag='" + textbox4.text + "'where uid='" + textbox1.text + "'");
}
if (label1.text=="fid")
{
i = sqldesigner.executenoquery("update dtfunction set rid='" + textbox2.text + "',uid='" + textbox3.text + "',uflag='" + textbox4.text + "'where fid='" + textbox1.text + "'");
}
if (i > 0)
{
messagebox.show("succeed！");
}
else
{
messagebox.show("failed！");
}
}
}
}
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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。
原文链接：http://www.cnblogs.com/zhiboday/p/6107057.html