连接到访问数据库和查询用户登录信息不拉回数据

任何帮助将是伟大的谢谢你。不知道为什么它的所有方法返回一个空值我不确定它是否连接到数据库。连接到访问数据库和查询用户登录信息不拉回数据

我的网络配置文件

<configuration> 
    <connectionStrings> 
    <add name="accessConnectionString" providerName="Microsoft.Jet.OLEDB.4.0" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\***\Desktop\pratice\AccessTest\App_Data\TheList.mdb;Persist Security Info=True"/> 
    </connectionStrings> 
    <system.web> 
    <compilation debug="true" targetFramework="4.0"/> 
    </system.web> 
</configuration>

中间层的代码来检查，如果用户是在数据库中，如果他们一些回报，如果没有返回null

OleDbConnection sconn = new OleDbConnection(); 
    OleDbCommand scmd = new OleDbCommand(); 
    public DBMiddleTier() 
    { 
     try 
     { 
      // set up the connection strings   
      sconn.ConnectionString = ConfigurationManager.ConnectionStrings["accessConnectionString"].ToString(); 
     } 
     catch(Exception ex) 
     { 
      throw ex; 
     } 
    }//end of constructor 
    //class to check membership 
    public object checkMembership(string logid, string password) 
    { 
     try 
     { 
      sconn.Open(); 
      //set propertiers of the command 
      scmd.Connection = sconn; 
      scmd.CommandType = CommandType.Text; 
      scmd.CommandText = "select * from SubDealers where LoginID = @InputUsername and Password = @InputPassword"; 
      scmd.Parameters.Clear(); 
      OleDbParameter checkUsername = scmd.Parameters.Add("@InputUsername", OleDbType.VarChar, 50); 
      checkUsername.Value = logid; 
      OleDbParameter checkPassword = scmd.Parameters.Add("@InputPassword", OleDbType.VarChar, 50); 
      checkPassword.Value = password; 
      object result = scmd.ExecuteScalar(); 
      return result; 
     } 
     catch (OleDbException sqx) 
     { 
      throw sqx; 
     } 
     finally 
     { 
      sconn.Close(); 
     } 
    }//end of method

我的代码隐藏页

try 
     { 
      object result = dm.checkMembership(txtLoginID.Text, txtPassword.Text); 
      if (result != null) 
      { 
       Response.Redirect("https://www.google.com/"); 
      } 
      else 
      { 
       txtLoginID.Text = ""; 
       txtPassword.Text = ""; 
       Page.ClientScript.RegisterStartupScript(this.GetType(), "notAmember", "alert('Sorry wrong id or password');", true); 
      } 
     } 
     catch (Exception ex) 
     { 
      Page.ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + ex.Message + "');", true); 
     }

来源

2012-10-20 user996502

难道你不能通过代码来检查？ – SearchAndResQ

你有试过吗？

select * from [SubDealers] where [LoginID] = @InputUsername and [Password] = @InputPassword"

来源

2012-10-20 07:35:19

连接到访问数据库和查询用户登录信息不拉回数据

回答

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