C# Parameterized Query With Null Values

Jul 19, 2005

Hello.

I have (2) related questions.

#1: I am using a paramterized query, but am unable to make it work if one of the values happens to be null.

        if (Request.Form["txtLink1"] != "")
            {
           
    mySqlCmd.Parameters.Add(new SqlParameter("@link1",
SqlDbType.VarChar));
           
    mySqlCmd.Parameters["@link1"].Value =
Request.Form["txtLink1"];
            }
            else
            {
           
    mySqlCmd.Parameters.Add(new SqlParameter("@link1",
SqlDbType.VarChar));
                mySqlCmd.Parameters["@link1"].Value = null;
            }

If txtLink1 happens to be empty, I want @link1 to enter null. The
column in the Sql Server allows for nulls, but I get an error message
that says no value was supplied. In short, how do I supply a null value
using a parameterized query?

#2: For debugging purposes, how can I view what my SQL string looks
like (with all the values entered) before it gets submitted to the
database? When I view the string, it still contains the placeholder
values (@link1) instead of the actual values.

Thanks in advance!

-Brenden

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Parameterized Query Returns One Row With Null Values.

Jul 28, 2006

I am hoping someone could help me understand why this is happening and perhaps a solution.
I am using ASP.NET 2.0 with a SQL 2005 database.
In code behind, I am performing a query using a parameter as below:
sql = "SELECT field_name FROM myTable WHERE (field_name = @P1)"
objCommand.Parameters.Add(New SqlParameter("@P1", TextBox1.Text))
The parameter is obtained from TextBox1 which has valid input. However, the value is not in the table. The query should not return ANY results. However, I am getting one single row back with null values for each field requested in the query.
The SQL user account for this query has select, insert, and update permissions on the table. The query is simple, no joins, and the table has no null values in any fields. If I perform the exact same query using an account with select only permission on the table, I get what I was expecting, no records. Then if I go back to the previous user account with more permissioins, and I change the query to pass the paramter this way:
sql = String.Format("SELECT field_name FROM myTable WHERE (field_name = {0})", TextBox1.Text)
I also get NO records retuned using the same criteria.
What is going on here? I would prefer to use the parameterized query method with the account having elevated permissions. Is there some command object setting that can prevent the null row from returning?
Thanks!

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Jul 18, 2006

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cmd.Add(new SqlCeParameter("@IntColumn", DBNull.Value));

cmd.CommandText = "select count(*) from TableName where IntColumn is not @IntColumn";

cmd.Add(new SqlCeParameter("@IntColumn", SqlInt32.Null));

cmd.CommandText = "select count(*) from TableName where not IntColumn = @IntColumn";

cmd.Add(new SqlCeParameter("@IntColumn", DBNull.Value));


cmd.CommandText = "select count(*) from TableName where not IntColumn = @IntColumn";

cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Int32));
cmd.Parameters["@IntColumn"].Value = SqlInt32.Null;
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cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Int32));

cmd.Parameters["@IntColumn"].Value = SqlInt32.Null;

cmdGetNumRead.CommandText = "select count(*) from TableName where not IntColumn = @IntColumn";

cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Int32));

cmd.Parameters["@IntColumn"].Value = DBNull.Value;

cmdGetNumRead.CommandText = "select count(*) from TableName where IntColumn is not @IntColumn";



cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Int32));


cmd.Parameters["@IntColumn"].Value = DBNull.Value;


cmdGetNumRead.CommandText = "select count(*) from TableName where not IntColumn = @IntColumn";

cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Variant));


cmd.Parameters["@IntColumn"].Value = SqlInt32.Null;
cmd.CommandText = "select count(*) from Meter where IntColumn is not @IntColumn";

cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Variant));



cmd.Parameters["@IntColumn"].Value = SqlInt32.Null;

cmd.CommandText = "select count(*) from Meter where not IntColumn = @IntColumn";

md.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Variant));



cmd.Parameters["@IntColumn"].Value = DBNull.Value;

cmd.CommandText = "select count(*) from Meter where IntColumn is not @IntColumn";



cmd.Parameters.Add(new SqlCeParameter("@IntColumn", SqlDbType.Variant));




cmd.Parameters["@IntColumn"].Value = DBNull.Value;


cmd.CommandText = "select count(*) from Meter where not IntColumn = @IntColumn";

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An unhandled exception occurred during the execution of the current web
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2 Imports System.Data.SqlClient
3 Partial Class News_Articles_Default
4 Inherits System.Web.UI.Page
5
6 Protected Sub btnPost_Click( _
7 ByVal sender As Object, _
8 ByVal e As System.EventArgs) _
9 Handles btnPost.Click
10
11 Dim cs As String
12 cs = WebConfigurationManager _
13 .ConnectionStrings("ConnectionStringNews") _
14 .ConnectionString
15 Dim insertNews As String
16 insertNews = "INSERT news " _
17 + "(newsid, author, date, articles) " _
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19
20 Dim con As SqlConnection
21 con = New SqlConnection(cs)
22 Dim cmd As SqlCommand
23 cmd = New SqlCommand(insertNews, con)
24
25 Dim newsid As String
26 newsid = Request.QueryString("news")
27
28 cmd.CommandText = insertNews
29 cmd.Parameters.Clear()
30 cmd.Parameters.AddWithValue("newsid", _
31 newsid)
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33 txtAuthor.Text)
34 cmd.Parameters.AddWithValue("date", _
35 DateTime.Now)
36 cmd.Parameters.AddWithValue("articles", _
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39 cmd.ExecuteNonQuery()
40 con.Close()
41
42 End Sub
43
44
45 End Class
46
 

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cn.Open();
cmd.ExecuteNonQuery();
  thanks,vijay

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SqlDataReader dtr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
 
 
return dtr;
 
This is the code trying to accomplish the same thing with a Dataset instead.
 
public DataSet organID(DataSet dataset)
{
Singleton s1 = Singleton.Instance();
Guid uuid;
uuid = new Guid(s1.User_id);
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SqlCommand cmd = new SqlCommand(queryString, con);
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SqlDataAdapter adapter = new SqlDataAdapter();
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adapter.Fill(dataset);
return dataset;
 
 
 
}
 
Assume that the conString is set to a valid connection string. The Singlton passes the userid in from some code in the code behind page ...this functionality works as well.
So assume that the Guid is a valid entry..I should return a valid dataset but its null.

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Apr 16, 2008

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I know I can't do this:

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Currently, I'm doing this by writing the <list of cities> out to a separate table, just so I can do the query.

Select * from people where city in (Select CityName from CityTable)

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Hi,

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Hey everyone,

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SQL Execution Error.

Executed SQL statement: SELECT LocationID, StreetNum, StreetName, rowguid FROM tblLocations WHERE (StreetNum = @StreetNum) AND (StreetName LIKE '%' + @StreetName + '%')
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1 - -
2 - -
3 - -
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Depending on the table size I see 1M or more reads for these querries.

If I rebuild the query in SSMS, but replace the paramerters with actual values I only see a few reads.

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Is there a way to make SQL Server use another strategy when using the parameterized query?

SQL Server Version is 11.0.3401.
if object_id('tempdb..#tbl') is not null
drop table #tbl;
create table #tbl
(
[No] nvarchar(20)
,[Description1] nvarchar(250)

[Code] ....

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[URL] ...

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