.net C#實現登入介面並進行跳轉
阿新 • • 發佈:2019-02-20
登入介面:
Userloagin.aspx
Userloagin.aspx.cs<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Userloagin.aspx.cs" Inherits="UserLogin.Userloagin" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <div style="text-align: center;margin-bottom: 40px;"> 登入畫面<br /> <br /> 使用者ID:<asp:TextBox ID="id" runat="server" Height="20px" Width="180px"></asp:TextBox> <br /> <br /> 密 碼:<asp:TextBox ID="password" runat="server" Height="20px" Width="180px"></asp:TextBox> <br /> <br /> <asp:Button ID="Button" runat="server" Height="24px" OnClick="Button_Click" Text="登入" Width="75px" /> <br /> <br /> <asp:Label ID="Label" runat="server" ForeColor="Red"></asp:Label> <br /> </div> </form> </body> </html>
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; //新增以下參照 using System.Windows.Forms; //using Oracle.DataAccess.Client;//oracle自帶的 using System.Data.OracleClient; using System.Data.SqlClient;//using Oracle.DataAccess.Client; using System.Data;//注意 namespace UserLogin { public partial class Login : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button_Click(object sender, EventArgs e) { if (id.Text == "") { //MessageBox.Show("使用者ID必須存在入內!");//using System.Windows.Forms; Response.Write(@"<script>alert('使用者名稱不能為空!');</script>"); } if (password.Text == "") { //MessageBox.Show("密碼不能為空!"); Response.Write(@"<script>alert('使用者密碼不能為空!');</script>"); } //連線Oracle string connString = "User ID=system;Password=Lg_12358134711;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 10.167.23.31)(PORT = 1521))) (CONNECT_DATA = (SID = oracletest)))"; OracleConnection conn = new OracleConnection(connString); conn.Open(); //方法一 //DataSet 是用來儲存資料庫資料的。資料庫 DataSet,表 DataTable,列 DataColumn,行 DataRow //DataSet 和 物理資料庫是兩個客體,要使這兩個客體保持一致,就需要使用 DataAdapter 類來同步兩個客體。 //一般來說操作流程是:使用 DataAdapter 把物理資料庫中的資料填充到 DataSet 中的 DataTable 裡。當我們對記憶體中的 DataSet 做了增、刪、改操作後,可以使用 DataAdapter 同步回資料庫。 //http://blog.163.com/jianzhong_w/blog/static/3833113620077245104435/ //建立DataSet SqlDataAdapter物件 //string strSql = "select * from USER_MST"; //OracleDataAdapter odr = new OracleDataAdapter(strSql,conn); //try //{ // DataSet ds = new DataSet(); // odr.Fill(ds, "USER_MST"); // for (int i = 0; i < ds.Tables["USER_MST"].Rows.Count; i++) // { // string User = id.Text; // string Psw = id.Text.Trim(); // string db_Uid = ds.Tables["USER_MST"].Rows[i]["USERID"].ToString(); // string db_Psw = ds.Tables["USER_MST"].Rows[i]["PASSWORD"].ToString(); // string username = ds.Tables["USER_MST"].Rows[i]["USERNAME"].ToString(); // if (id.Text == db_Uid && password.Text == db_Psw) // { // Label.Text = "登陸成功"; // Session["username"] = username; // Session["userid"] = db_Uid; // Server.Transfer("menu.aspx"); // } // } // Label.Text = "登陸失敗!使用者ID或密碼錯誤!"; //} //catch (OracleException ex) //{ // Console.WriteLine(ex.Message); //} //finally //{ // conn.Close(); //} //string strOrcSelect = "select USERNAME from USER_MST where USERID=@USERID and PASSWORD=@PASSWORD"; //OracleCommand comm = new OracleCommand(strOrcSelect, conn); //comm.Parameters.Add("USERID", id.Text); //comm.Parameters.Add("PASSWORD", password.Text); //OracleDataReader sdr = comm.ExecuteReader(); //while (sdr.Read()) //{ // Label.Text = "登陸成功"; // Session["USERID"] = id.Text; // Session["PASSWORD"] = password.Text; // Response.Redirect("menu"); //} // Label.Text = "登陸失敗!使用者ID或密碼錯誤!"; try { string userid = id.Text; string psd = password.Text; //Oracle //string strOrcSelect = "select * from USER_MST where USERID=" + userid + " and PASSWORD=" + psd;//select * from USER_MST where USERID= 12 and PASSWORD = 123 //string strOrcSelect = "select * from USER_MST where USERID='userid' and PASSWORD='psd'";//select * from USER_MST where USERID='userid' and PASSWORD='psd'; //上述表示錯誤,應為下面的兩種形式 //形式一: //string strOrcSelect = "select * from [USER_MST] where id='" + userid + "' and password='" + psd + "'"; //形式二: //string strOrcSelect = string.Format("select count(*) from USER_MST where USERID= '{0}'and PASSWORD = '{1}'", this.id.Text.Trim(), this.password.Text.Trim()); //string strOrcSelect = string.Format("select count(*) from USER_MST where USERID= '{0}'and PASSWORD = '{1}'", this.id.Text.Trim(), this.password.Text.Trim()); //OracleCommand comm = new OracleCommand(strOrcSelect, conn); //if (comm.ExecuteScalar() == null)//可能會失敗,需要進行判斷 //{ // Label.Text = "登陸失敗!使用者ID或密碼錯誤!"; //} //else //{ // int i = int.Parse(comm.ExecuteOracleScalar().ToString()); //} //ExecuteScalar():從資料庫中檢索單個值。執行查詢,並返回查詢所返回的結果集中第一行的第一列或空引用(如果結果集為空).忽略其他列或行. //ExecuteScalar()所求的資料集為空或不存在兩種情況: //object obj = comm.ExecuteScalar(); //情況一:if (obj == System.DBNull.Value) { MessageBox.Show("Result Is Null 資料集的行數為一");} //情況二:if (obj == null ) {MessageBox.Show("資料集的行數為零");} //OracleCommand cmd = conn.CreateCommand(); //建立命令物件 //cmd.CommandText = "select USERNAME from USER_MST where id='" + userid + "'"; //提供oracle命令 //不可以使用:string strOrcSelect = string.Format("select count(*) from USER_MST where USERID = '{0}'and PASSWORD = '{1}'", this.id.Text.Trim(), this.password.Text.Trim()); //ExecuteReader()和ExecuteScalar()的用法 string strOrcSelect = "select USERNAME from USER_MST where USERID='" + userid + "'and PASSWORD='" + psd + "'";//注意使用'" + userid + "','" + psd + "'中單引號可以加也可以不加 //string strOrcSelect = string.Format("select USERNAME from USER_MST where USERID = '{0}' and PASSWORD = '{1}'", this.id.Text.Trim(), this.password.Text.Trim()); OracleCommand cmd = new OracleCommand(strOrcSelect, conn); if (cmd.ExecuteScalar() == null || cmd.ExecuteScalar()== System.DBNull.Value)//comm.ExecuteScalar()需要進行判斷,資料庫查詢結果為空時;注意大寫NULL是錯誤的 { //MessageBox.Show("登陸失敗!使用者ID或密碼錯誤!"); //Response.Write(@"<script>alert('登陸失敗!使用者ID或密碼錯誤!')</script>"); //Response.Write(@"<script language='javascritp'>alert('登陸失敗!使用者ID或密碼錯誤!');location.href='Userloagin.aspx'</script>"); //Page.ClientScript.RegisterStartupScript(GetType(), "error", "<script>alert('使用者ID或密碼錯誤!');</script>"); Label.Text = "登陸失敗!使用者ID或密碼錯誤!"; } else { int i = int.Parse(cmd.ExecuteScalar().ToString());//comm.ExecuteScalar()大於0 Label.Text = "登入成功"; //利用Session進行儲存userid,username //方法二: //OracleDataReader讀取多個結果集,OracleDataReader中的NextResult()來接收多個結果集 //DataReader物件提供只讀單向資料的快速傳遞。 //單向:您只能依次讀取下一條資料;只讀:DataReader中的資料是隻讀的,不能修改;相對地,DataSet中的資料可以任意讀取和修改 //只可使用:select USERNAME from USER_MST where USERID = userid and PASSWORD = psd; //OracleDataReader red = cmd.ExecuteReader(); //執行命令返回結果指派給DataReader物件 //while (red.Read())//迴圈列 //{ // string username = red["USERNAME"].ToString(); // Session["username"] = username; // Session["userid"] = userid; // Server.Transfer("menu.aspx"); //} //方法三 //只可使用:select USERNAME from USER_MST where USERID = userid and PASSWORD = psd; string username = cmd.ExecuteScalar().ToString(); Session["username"] = username; Console.Write(Session["username"].ToString()); Session["userid"] = userid; Response.Redirect("menu.aspx"); //Server.Transfer("menu.aspx"); } } catch (OracleException ex) { Console.WriteLine(ex.Message); } finally { conn.Close(); } } } }
登陸成功後跳轉到系統主介面:
menu.aspx
menu.aspx<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="menu.aspx.cs" Inherits="UserLogin.main" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> </head> <body> <form id="form1" runat="server"> <div style="text-align: center"> 歡迎進入該系統</div> <p> 使用者ID:<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </p> <p> 使用者名稱:<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label> </p> </form> <p> </p> </body> </html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace UserLogin
{
public partial class main : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = Session["userid"].ToString();
Label2.Text = Session["username"].ToString();
}
}
}