How to pass a empty parameter in URL filter query string

[MarceloSilva5_]

Hello i have a question:

I created this query:

(Name as text,datetimestart as text, datetimeend as text, listzones as text, listaps as text, listdevices as text, listuserprops as text, topreg as text) as table =>

let
    Source = Csv.Document(Web.Contents("https://localhost:44310/api/Emp?Name=" & Name & "&datetimestart=" &  datetimestart & "&datetimeend=" & datetimeend & "&listzones=" & listzones & "&listaps=" & listaps & "&listdevices=" & listdevices & "&listuserprops=" & listuserprops & "&topreg=" & topreg &  ""),[Delimiter=":", Encoding=65001, QuoteStyle=QuoteStyle.None])
in
    Source

In total i have 8 parameters and i need to pass to the URL some empty parameters like "listdevices and listuserprops"
But when i try to do it i receive the message "Please specify a value for listuserprops"

Is there a way to pass a empty parameter and how  ?


Thanks!!!

[v-yiruan-msft · Accepted solution]

Hi @MarceloSilva5_ ,

Please try to update the codes of parameter listdevices and listuserprops as below and check if it can work or not:

null meta [IsParameterQuery=true, Type="Text", IsParameterQueryRequired=false]

And you can get the details of query parameter in the following links.

Creating Dynamic Parameters in Power Query

Best Regards

[MarceloSilva5_]

My Stored procedure :

if (@Name = 'UniqueVisits')
            begin
                  set @BaseQuery = 'select count(distinct fp.device_id) as NVisits from f_presence fp '

				  if (@listzones is not null)
				  begin
					--set @includeap = 1
					set @QueryFilter = @QueryFilter + ' and coalesce(fp.zone_id,-1) in (' + @listzones + ')'   
				  end

				  if (@listaps is not null)
					set @QueryFilter = @QueryFilter + ' and coalesce(fp.ap_id,-1) in (' + @listaps + ')'

				  

                  set @QueryFilter = ' WHERE ((fp.datetime_start < ' + cast(@datetimeend as nvarchar(12)) + ' and fp.datetime_end > ' + cast (@datetimestart as nvarchar(12)) + ') OR fp.datetime_start = ' +  cast (@datetimestart as nvarchar(12)) + ')' + @QueryFilter 
                  
                  if (@includedevice = 1)
						set @TablesJoin = @TablesJoin + ' inner join l_device ld on ld.device_id = fp.device_id '
						
				  --if (@includeap = 1)
						--set @TablesJoin = @TablesJoin + ' inner join l_accesspoint lap on lap.ap_id = fp.ap_id '
                  
                  if (@includesession = 1)
                        set @TablesJoin = @TablesJoin + ' inner join f_session fs on fs.presence_id = fp.presence_id and ((fs.datetime_start <'+ cast(@datetimeend as nvarchar(12)) + ' and fs.datetime_end > ' + cast (@datetimestart as nvarchar(12)) + ') OR fs.datetime_start = ' +  cast (@datetimestart as nvarchar(12)) + ')'
                  
                  if (@includeappsession = 1)
                        set @TablesJoin = @TablesJoin + ' inner join f_applicationsession fapps on fapps.session_id = fs.session_id and fapps.datetime_start < ' + cast(@datetimeend as nvarchar(12)) + ' and fapps.datetime_start >= ' + cast (@datetimestart as nvarchar(12))
                        
                  if (@includeuserproperty = 1)
                        set @TablesJoin = @TablesJoin + ' inner join (' + @listuserprops + ') as lup on lup.aleuser_id = fs.user_id '

If I change to Dynamic Parameters . I always got this error i am not sure if is the power by  or the API i never saw anything like that

Error:

 My api :

public string getStudentDetails(string Name,Int64? Datetimestart, Int64? Datetimeend, string Listzones, string Listaps, string Listdevices, string Listuserprops, int? Topreg)
        {
            SqlConnection myConnection = new SqlConnection();
            myConnection.ConnectionString = "Data Source=DESKTOP-R7QRMCV;Initial Catalog=DW_NSA;Integrated Security=True;TrustServerCertificate=true";
            SqlCommand sqlCmd = new SqlCommand();
            sqlCmd.CommandType = CommandType.StoredProcedure;
            sqlCmd.CommandText = "GetMeasures2";
            sqlCmd.Connection = myConnection;
            sqlCmd.Parameters.AddWithValue("@Name", Name);
            sqlCmd.Parameters.AddWithValue("@datetimestart", Datetimestart);
            sqlCmd.Parameters.AddWithValue("@datetimeend", Datetimeend );
            sqlCmd.Parameters.AddWithValue("@listzones", Listzones);
            sqlCmd.Parameters.AddWithValue("@listaps", Listaps);
            sqlCmd.Parameters.AddWithValue("@listdevices", Listdevices);
            sqlCmd.Parameters.AddWithValue("@listuserprops", Listuserprops);
            sqlCmd.Parameters.AddWithValue("@topreg", Topreg);
            SqlDataAdapter sda = new SqlDataAdapter(sqlCmd);
            DataSet ds = new DataSet();
            string jsonString = string.Empty;
            myConnection.Open();
            sda.Fill(ds);
            myConnection.Close();
            if (ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
            {
                jsonString = JsonConvert.SerializeObject(ds.Tables[0]);

            }
            return jsonString;
        }

[mohammedadnant]

Hi @MarceloSilva5_

Pls use nullable in between

from

listdevices as text, listuserprops as text

to

listdevices as nullable text, listuserprops as nullable text

Thanks & Regards,

Mohammed Adnan

Learn Power BI: https://www.youtube.com/c/taik18

[MarceloSilva5_]

Doesn't Work 😪