System.Data.OleDb.OleDbException (0x80040E14)：查詢表達式中的語法錯誤（缺少運算符）電子郵件 = '12' 和密碼 '12''

Question

它已連接到數據庫，但是當我嘗試從數據庫中讀取以驗證登錄時，出現此錯誤。

System.Data.OleDb.OleDbException (0x80040E14): Syntax error (missing operator) in query expression 'Email= '12' and Password 'fgrt''.
           at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(OleDbHResult hr)
           at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult)
           at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult)
           at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method)
           at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior)
           at COSSA_E_Voting_System.LoggingIn.guna2Button2_Click(Object sender, EventArgs e) in C:\Users\kusic\Desktop\COSSA E-Voting System\LoggingIn.cs:line 72
           at System.Windows.Forms.Control.OnClick(EventArgs e)
           at Guna.UI2.WinForms.Guna2Button.OnClick(EventArgs e)
           at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
           at System.Windows.Forms.Control.WndProc(Message& m)
           at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
        
    

這是單擊按鈕登錄時的代碼

con.Open();
    OleDbCommand cmd = new OleDbCommand();
    OleDbDataAdapter da = new OleDbDataAdapter();
    // cmd.Connection = con;
    string login = "SELECT * FROM tbl_students WHERE Email= '" + txtEmail.Text + "' and Password '" + txtPassword.Text + "'";
    cmd = new OleDbCommand(login, con);
    
    OleDbDataReader reader;
    reader = cmd.ExecuteReader();
    
    if (reader.Read() == true)
    {
                   
       MessageBox.Show("Email and Password is valid!");
    }

Answer 1

這看起來像位大小錯誤。 嘗試將您的項目從 ANY cpu 更改（強制）為 x86，然后重新構建 - 看看是否可行。