c#简单数据库操作代码

<div id="td_content">protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)<br> {<br> OleDbConnection conn = new OleDbConnection();<br> conn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("app_data/sdr.mdb");<br> string sql;<br> switch (DropDownList2.SelectedValue) {<br> case "插入数据":<br><br> sql = "insert into userinfo(sname,spwd) values('MM','sym')";<br> OleDbCommand cmd = new OleDbCommand(sql, conn);<br> conn.Open();<br> cmd.ExecuteNonQuery();<br> conn.Close();<br> break;
<p> case "删除数据":<br> sql = "delete * from userinfo";<br> OleDbCommand cmd1 = new OleDbCommand(sql, conn);<br> conn.Open();<br> cmd1.ExecuteNonQuery();<br> conn.Close();<br> break;<br> case "读取数据":<br> sql = "select * from userinfo";<br> OleDbCommand cmd2 = new OleDbCommand(sql, conn);<br> conn.Open();</p>
<p> OleDbDataReader dr = cmd2.ExecuteReader();<br> if (dr.Read())<br> { <br> Response.Write(dr[1]);<br> }<br> else<br> { <br> Response.Write ("Roung");<br> }</p>
<p> conn.Close();<br> break;<br> case"更新数据":<br> sql = "update userinfo set sname='张海波',spwd='sym'";<br> OleDbCommand cmd3 = new OleDbCommand(sql, conn);<br> conn.Open();<br> cmd3.ExecuteNonQuery();<br> conn.Close();<br> break;<br> };<br></p>
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