Question

我有一个“我的用户帐户”＆＃39;我想要从我的Azure数据库中的18列填充18个控件的网页。我已将用户登录电子邮件设置为会话值＆＃39;新＆＃39;我用它来搜索数据库并找到相应的行。

我正在使用以下代码，但我认为这必须是漫长的（并且执行缓慢）方式。之前我被告知如果我发现自己使用了复制＆gt;粘贴，那么我做错了！

有人可以建议更短（阅读：＆＃34;更好＆＃34;）的方式来编码吗？

显示的代码适用于页面上的前两个标签。其余控件是TextBoxes和DropDownList。我认为必须有一种方法，除了SQL CommandText需要为每个控件更改以获取更正列数据（account_no，first_name，last_name，email_1，phone_1等）

try
{
    if (Session["New"] == null)
    {
        Response.Redirect("~/Account/Login.aspx"); //*****CHANGE REDIRECT WEBPAGE*****
    }
    else
    {
        string str = Convert.ToString(Session["New"]);
        string cpUsersConnection = ConfigurationManager.ConnectionStrings["cp_usersConnection"].ToString();
        SqlConnection oSqlConnection = new SqlConnection(cpUsersConnection);
        oSqlConnection.Open();
        SqlCommand oSqlCommand = new SqlCommand();
        oSqlCommand.Connection = oSqlConnection;
        oSqlCommand.CommandType = CommandType.Text;
        oSqlCommand.CommandText = "select account_no from users where email_1 = '" + str + "'";
        SqlDataAdapter oSqlDataAdapter = new SqlDataAdapter();
        oSqlDataAdapter.SelectCommand = oSqlCommand;
        SqlDataReader reader = oSqlCommand.ExecuteReader();

        if (reader.Read())
        {
            AcNo.Text = reader["account_no"].ToString();
        }

        string str1 = Convert.ToString(Session["New"]);
        string cpUsersConnection1 = ConfigurationManager.ConnectionStrings["cp_usersConnection"].ToString();
        SqlConnection oSqlConnection1 = new SqlConnection(cpUsersConnection);
        oSqlConnection.Open();
        SqlCommand oSqlCommand1 = new SqlCommand();
        oSqlCommand1.Connection = oSqlConnection;
        oSqlCommand1.CommandType = CommandType.Text;
        oSqlCommand1.CommandText = "select registration_date from users where email_1 = '" + str + "'";
        SqlDataAdapter oSqlDataAdapter1 = new SqlDataAdapter();
        oSqlDataAdapter1.SelectCommand = oSqlCommand1;
        SqlDataReader reader1 = oSqlCommand1.ExecuteReader();

        if (reader1.Read())
        {
            RegDate1.Text = reader1["registration_date"].ToString();
        }

    }
}
catch
{
    if (Session["New"] == null)
    {
        Response.Redirect("~/Account/Login.aspx"); //*****CHANGE REDIRECT WEBPAGE*****
    }

    AcNo.Text = "";
    RegDate1.Text = "";
    SetDBdateMessages.Text = "User Session Error - Please Contact Support";
}

有什么想法吗？

更新：

以下答案中的代码似乎正在生成一个迷路引号，这会影响我的数据库搜索我的下拉列表。见这里：

            else
            {

                string str = Convert.ToString(Session["New"]);
                string cmdText = @"select account_no, first_name, last_name, email_1, email_2, business_street_1, business_street_2, business_street_3, business_city, business_state, business_postal_code, business_country, company_name, business_type, phone_1, phone_2, phonecode_1, phonecode_2, website, registration_date, screens_no, user_password from users where email_1 =@email";
                string cpUsersConnection = ConfigurationManager.ConnectionStrings["cp_usersConnection"].ToString();
                using (SqlConnection oSqlConnection = new SqlConnection(cpUsersConnection))
                using (SqlCommand oSqlCommand = new SqlCommand(cmdText, oSqlConnection))
                {
                    oSqlConnection.Open();
                    oSqlCommand.Parameters.Add("@email", SqlDbType.NVarChar).Value = str;
                    using (SqlDataReader reader1 = oSqlCommand.ExecuteReader())
                    {
                        if (reader1.Read())
                        {
                            AcNo.Text = reader1["account_no"].ToString();
                            TextBoxFName.Text = reader1["first_name"].ToString();
                            TextBoxLName.Text = reader1["last_name"].ToString();
                            TextBoxEmail1.Text = reader1["email_1"].ToString();
                            TextBoxEmail2.Text = reader1["email_2"].ToString();
                            TextBoxBusAddr1.Text = reader1["business_street_1"].ToString();
                            TextBoxBusAddr2.Text = reader1["business_street_2"].ToString();
                            TextBoxBusAddr3.Text = reader1["business_street_3"].ToString();
                            TextBoxBusAddrCity.Text = reader1["business_city"].ToString();
                            TextBoxBusAddrState.Text = reader1["business_state"].ToString();
                            TextBoxPostalCode.Text = reader1["business_postal_code"].ToString();
                            TextBoxBusAddrCountry.Text = reader1["business_country"].ToString();
                            TextBoxCoyName.Text = reader1["company_name"].ToString();
                            TextBoxPhn1.Text = reader1["phone_1"].ToString();
                            TextBoxPhn2.Text = reader1["phone_2"].ToString();
                            TextBoxWebsite.Text = reader1["website"].ToString();
                            RegDate1.Text = reader1["registration_date"].ToString();
                            TextBoxScreensNo.Text = reader1["screens_no"].ToString();

                            var findBusType = reader1["business_type"].ToString();
                                var selectedIndex = -1;

                                for (int i = 0; i < BusTypeddl.Items.Count; i++)
                                {
                                    if (BusTypeddl.Items[i].ToString() == findBusType)
                                    {
                                        selectedIndex = i;
                                        break;
                                    }
                                }
                                if (selectedIndex > -1)
                                {
                                    BusTypeddl.SelectedIndex = selectedIndex;
                                }                                
                        }
                    }
                }
            }

business_type从reader1列检索的值应该是Advertising，它存在于我的DropDownList中，但当我单步执行调试器时，findBusType的值为"Advertising {1}}显然不匹配我的DropDownList中的任何值。我无法找到迷路"出现的位置。你的想法一如既往地非常感激。

Answer 1

SQL中的SELECT语句允许选择要从表中检索的字段。您不仅限于一个领域。

.....
string cmdText = @"select account_no,registration_date, other_field1, 
                   other_field2, other_fieldN
                   from users 
                   where email_1 = @email";

using(SqlConnection oSqlConnection = new SqlConnection(cpUsersConnection))
using(SqlCommand oSqlCommand = new SqlCommand(cmdText, oSqlConnection))
{
     oSqlConnection.Open();
     oSqlCommand.Parameters.Add("@email", SqlDbType.NVarChar).Value = str;
     using(SqlDataReader reader = oSqlCommand.ExecuteReader())
     {
        if (reader.Read())
        {
             AcNo.Text = reader["account_no"].ToString();
             RegDate1.Text = reader["registration_date"].ToString();
             otherTextBox.Text = reader["other_field1"].ToString();
             ... and so on ...
        }
    }
}

此示例中有两点需要强调：

定义sql语句，使用单个字符串声明要检索的所有字段，并使用参数占位符而不是字符串连接
将您的一次性物品放入使用声明中以正确使用退出使用区块时将它们丢弃

使用最小代码从SQL数据库行填充TextBox

1 个答案: