Insert Null Values

Jan 28, 2005

Hi all





Iam having some problems with null values





try


{


cmd.Parameters["@fmv"].Value = Convert.ToDecimal(TextBox13.Text);


}


catch


{


cmd.Parameters["@fmv"].Value =System.Data.SqlTypes.SqlDecimal.Null;


}





for Empty Textbox values


i am getting the following error,





System.Data.SqlTypes.SqlNullValueException: Data is Null. This method or property cannot be called on Null values.





My Database is allowed to accept null values.





System.Data.SqlType.SqlDatetime.Null works but SqlDecimal.Null does not work.





Could any one help me with this?





Thanks





Raj

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Aspnet_regsql.exe - Cannot Insert Null Values

Oct 20, 2006

Im trying to setup a SQL server 2000 database to use membership & roles.  Running aspnet_regsql.exe gives me the following errorsSetup failed.Exception:An error occurred during the execution of the SQL file 'InstallCommon.sql'. The SQL error number is 515 and the SqlException message is: Cannot insert the value NULL into column 'Column', table 'tempdb.dbo.#aspnet_Permissions_________________________________________________________________________________________________000000008000'; column does not allow nulls. INSERT fails.Warning: Null value is eliminated by an aggregate or other SET operation.The statement has been terminated.----------------------------------------Details of failure----------------------------------------SQL Server: Database: [AddressVerification]SQL file loaded:InstallCommon.sqlCommands failed:CREATE TABLE #aspnet_Permissions(    Owner     sysname,    Object    sysname,    Grantee   sysname,    Grantor   sysname,    ProtectType char(10),    [Action]    varchar(20),    [Column]    sysname)INSERT INTO #aspnet_PermissionsEXEC sp_helprotectIF (EXISTS (SELECT name              FROM sysobjects             WHERE (name = N'aspnet_Setup_RestorePermissions')               AND (type = 'P')))DROP PROCEDURE [dbo].aspnet_Setup_RestorePermissionsSQL Exception:System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'Column', table 'tempdb.dbo.#aspnet_Permissions_________________________________________________________________________________________________000000008000'; column does not allow nulls. INSERT fails.Warning: Null value is eliminated by an aggregate or other SET operation.The statement has been terminated.   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async)   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()   at System.Web.Management.SqlServices.ExecuteFile(String file, String server, String database, String dbFileName, SqlConnection connection, Boolean sessionState, Boolean isInstall, SessionStateType sessionStatetype)Ive run this many times on other servers and have never come across this problem before.  Has anyone else ?  Does anyone know the cause and if there is a fix ??** I am logged in with full admin privaliges tiaMark. 

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Jan 5, 2004

- I'm a Novice -

I'd like to use an insert command to insert whatever data that is on the unbound form. The first three fields are required and I check those values prior to executing the code below. But some fields may be null.

Dim strSQL as string
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.
code
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I'm sorry, this question has a pretty long preamble, but bear with me as this will fully explain my problem, and save a number of clarification questions.I am using Visual Web Developer 2005 Express, with SQL Server 2005. After reading a Microsoft article saying that it was much better to use a three tier architecture with data adapters than to write explicit queries, I have used this approach extensively, and generally it works very well.  Typical code patterns are: -        Dim taPassenger As New ShippingTableAdapters.VPassengerTableAdapter        Dim tbpassenger As Shipping.VPassengerDataTable        Dim trpassenger As Shipping.VPassengerRow        .....        '   to process all passengers from a voyage: -        tbpassenger = taPassenger.GetDataByVOYid(Voyageid)        For Nbr As Integer = 1 To tbpassenger.Count            trpassenger = tbpassenger(Nbr - 1)             '    I now have the row available in properly-typed fields, eg trpassenger.vpxName             ...        Next        '   to read and process a single passenger        tbpassenger = tapassenger.GetDataByVPXid(VPXid)        trpassenger = tbpassenger(0)The table adapter has been created with Insert,Update, Delete methods.   Thus you can assign values to row fields, and then update the row: -        trpassenger.VPXName = "New Name"        ....        tapassenger.update(trpassenger)There are actually several overloads of the update method:  you could have written a field list, like this, where the names (VPXid etc) would be defined in my program as variables of the appropriate type for the corresponding column.        tapassenger.update(VPXid, VPXName, VPXAge, ....HOWEVER,  this doesn't work properly if you have non-string data that could be null.   Thus if the fourth field is a foreign key that could be null, if you write        Dim VPXVoyId as Nullable(of GUID)        VPXVoyid = nothing        tapassenger.update(VPXid, VPXname, VPXAge, VPXVoyid, ...or         Trpassenger.VPXVoyid = Nothing        tapassenger.update(trpassenger) you do NOT put a null value into the database.  Instead you store a value of "00000000-0000-0000-0000-000000000000".   You can solve this annoying problem in two ways: -A.   If you will ALWAYS be storing a null value at this point of your program, then simply write the update statement like this: -        tapassenger.update(VPXid, VPXname, VPXAge, Nothing, ...Here "Nothing" actually means "DBNull" even though it doesn't mean this when used in a normal VB assignment (and neither does DBNull).B   You can use the SetxxxxNULL method: -        If trpassenger.VPXVoyid = nothing then             trpassenger.SetVPXVoyidNull        End If        tapassenger.update(trpassenger) Thus when the program logic is complex and there are many paths to the update statement I will often put statements such as this in front of the update statement, using SetxxxxxNull for all non-string values that may be null.  You don't need to worry about string values because the Nullvalue property can be used to simply say that Null values are empty, and it all works properly, but for reasons unknown Microsoft have prohibited this for other data types. Now at last we get to my question, which is "How do I do the equivalent for an Insert?"   tapassenger.insert does not have any overloads, and the only form is  tapassenger.insert(field list).   But this creates the problem above:  if VPXVoyid = nothing then I insert the not-null value of "00000000-0000-0000-0000-000000000000".   If I COULD use the form tapassenger.insert(trpassenger), then I'd have another problem: if you haven't set trpassenger (for example with trpassenger = tbpassenger(0)) then it will not exist, so you will get an exception when you try to reference it.  Yet you can't write    If isnothing(trpassenger) then       trpassenger = new shipping.vpassengerrow)         (I've tries this both as an assignment, and as a Dim statement)    end ifSo far I can think of only two solutions, both awful: -a/    Use multi-choice logic to choose an appropriate insert statement.  If there is only one or two possibly-null fields, I could write:-        If field4 = nothing then            trpassenger.insert (VPXid, VPXname, VPXAge, Nothing, ..        However if there is more than one possibly-null field, you need (2 to the power of  nbr-of-possibly-null-fields) insert statements, with of course a lot of testing to choose which oneb/    I could insert the record with nulls, then read it back and update it.  Surely there is a better way!   Help! Thank you, Robert Barnes.    

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Server Error in '/' Application.


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Code Snippet
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SUM When There Are Null Values.

Nov 2, 2007

Would this take care of null values in either a.asset or b.asset?

SELECT convert(decimal(15,1),(sum(isnull(a.asset,0))/1000.0)+(sum(isnull(b.asset,0))/1000.0)) as total_assets

What's throwing me off is that there are multiple a.asset or b.asset for each unique ID. It seems to work, but I'm not following the logic too well. If I were doing this in another language, I would loop through, summing a.asset and b.asset wherever it's not null for each unique ID.

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Null Values

Jan 16, 2006

Hi,

How can I use "Derived Column" to check if a Datetime value is null or not and if null to insert  00/00/00 instead. ?

The background being that while using a "Derived Column" to change a Column from a (DT_DATE) to a (DT_DBTIMESTAMP) everytime I get a null value it see's it as a error.

And the column in particular has ~ 37 K blank / null fields so Im getting a lot of errors

So far I have tried to use something like

ISNULL([Column 34])

Or

SELECT ISNULL(ID, '00/00/0000') FROM [Column 34]

Or


SELECT ISNULL(au_id, '00/00/0000 00:00') AS ssn
FROM [Column 34

but none seems to work [Column 34] being the offending column.

What a normally use is just a simple "(DT_DBTIMESTAMP)[Column 34]"
in the expression column, which seems to work well, but here I get alot of errors

Any ideas?

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Null Values

Apr 20, 2007

I set up a new SQL database file, in that file I allowed nulls, When I went through code to save the record, the exception is saying it doesnt allow nulls.



Before I get to involved with SQL, is it a bad practice to use nulls?



If it is what do you enter in place of the null value,

which will lead to more code, right?



Davids Learning SQL

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Problem With Insert , Cannot Insert NULL Value

Jan 30, 2007

Good evening,

I have created a table like this:

create table Teacher(tid integer,
fname varchar(20),
lname varchar(30),
primary key(tid));

Well i insert many Teachers uning : insert into values ... etc.
These inserts are being placed in an sql file named insert.sql.
All the insertions are fine.

Now I'm trying to insert another teacher using another file e.g. my_insert.sql and it says cannot insert NULL into teacher tid etc.

Why does this happen,in my my_insert.sql file all the filds of the tid are filled with non null values?

What's going wrong?

Thanks, in advance!

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Dealing With Null Values

Jul 31, 2006

hi ive got a inert sub where i grab values from text boxes etxthe values are passed to a stored procedure however , one of these fields is a date field , but the field is not required ...so on this line if the date text box is left blank i get an error , not a valid date    .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Texti have tried ( the actiondate field can take nulls ..)if txtActionDate="" then    .Parameters.Add("@actiondate", SqlDbType.DateTime).Value = nothing else.Parameters.Add("@actiondate", SqlDbType.DateTime).Value = txtActionDate.Textend if but this doesnt workwhat is the best way of allowing blank values to be passed to the stored procedure( it doesnt fall over with normal text / varchar fields ) thanks

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SQLDataSource And Null Values

Dec 20, 2006

I have a sproce that accepts null for one of its parameters I can execute the sproce and enter null and it works fine, it returns all rows. When I try doing this with my GridView and the SQLDataSource it does not work. I need some help in understanding how the SQLDatasource wants a null. Here is what the parameter row of the SQLDataSource looks like.
<asp:ControlParameter ControlID="EnteredByText" DefaultValue="Null" Name="EnteredBy" PropertyName="Text"
Type="String" ConvertEmptyStringToNull="true" />
In my sproce I have setup the parameter as follows;
@EnteredBy Nvarchar(50)=Null
In my WHERE Clause I have:
WHERE (tblClient.EnteredBy = @EnteredBy OR @EnteredBy IS NULL)

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How To Check For NULL Values In T-SQL

Jan 19, 2007

How can I check on NULL values in a Select statement?
SELECT ID FROM TabelWHERE somecolumn <> NULL??

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Querying When Some Values Are Null

Mar 5, 2007

I wonder if someone out there can help me. I am writing an ASP application to query a MSSQL database. The users will be able to use one or all of 4 columns. There may be time when the columns are empty (null). How can I write a select query to ignore null values? A rough example of what I am talking about it below.
select * from table where value1='something' value2=<null> value3='something' value4=<null>
 I would like to ignore the null values so that in effect the statement would just do the following.
select * from table where value1='something' and value3='something'
 I realize my syntax is wrong but I think you get the idea. Any thoughts?

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Selecting Null Values

Mar 12, 2007

I have a stored procedure that allows users to select addresses based on partially supplied information from the user.  My procedure seems to work fine in all but a few cases. If a user decides to select all the rows for a particular country the procedure below does not return any rows even if the rows exist.  I tracked this down to the fact that for Non US countries I set both the StateCode and Country Code to nulls. .
 Below is a partial version of my code.  Can anyone show me how I can do a "Like" Search even if some of the fields in the row contain null values?
Thanks
 1 CREATE PROCEDURE dbo.Addresses_Like( @SendTo VarChar(50) = Null
2 , @AddressLine1 VarChar(50) = Null
3 , @AddressLine2 VarChar(50) = Null
4 , @City VarChar(50) = Null
5 , @StateCode VarChar(2) = Null
6 , @ZipCode VarChar(10) = Null
7 , @CountryCode VarChar(2) = Null)
8
9
10 Declare @SearchSendTo VarChar(50)
11 Declare @SearchAddressLine1 VarChar(50)
12 Declare @SearchAddressLine2 VarChar(50)
13 Declare @SearchCity VarChar(50)
14 Declare @SearchStateCode VarChar(2)
15 Declare @SearchZipCode VarChar(10)
16 Declare @SearchCountryCode VarChar(2)
17
18 If (@SendTo Is Null)
19 Set @SearchSendTo = ""
20 Else
21 Set @SearchSendTo = @SendTo
22
23 If (@AddressLine1 Is Null)
24 Set @SearchAddressLine1 = ""
25 Else
26 Set @SearchAddressLine1 = @AddressLine1
27
28 If (@AddressLine2 Is Null)
29 Set @SearchAddressLine2 = ""
30 Else
31 Set @SearchAddressLine2 = @AddressLine2
32
33 If (@City Is Null)
34 Set @SearchCity = ""
35 Else
36 Set @SearchCity = @City
37
38 If (@StateCode Is Null)
39 Set @SearchStateCode = ""
40 Else
41 Set @SearchStateCode = @StateCode
42
43 If (@ZipCode Is Null)
44 Set @SearchZipCode = ""
45 Else
46 Set @SearchZipCode = @ZipCode
47
48 If (@CountryCode Is Null)
49 Set @SearchCountryCode = ""
50 Else
51 Set @SearchCountryCode = @CountryCode
52
53
54 Select AddressID
55 , SendTo
56 , AddressLine1
57 , AddressLine2
58 , City
59 , StateCode
60 , ZipCode
61 , CountryCode
62 , RowVersion
63 , LastChangedDateTime
64 , OperID
65 From Addresses
66 Where SendTo Like RTrim(LTrim(@SearchSendTo)) + "%"
67 And AddressLine1 Like RTrim(LTrim(@SearchAddressLine1)) + "%"
68 And AddressLine2 Like RTrim(LTrim(@SearchAddressLine2)) + "%"
69 And City Like RTrim(LTrim(@SearchCity)) + "%"
70 And StateCode Like RTrim(LTrim(@SearchStateCode)) + "%"
71 And ZipCode Like RTrim(LTrim(@SearchZipCode)) + "%"
72 And CountryCode Like RTrim(LTrim(@SearchCountryCode)) + "%"
73 Order By CountryCode, City, AddressLine1, AddressLine2, SendTo
 

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Finding NULL Values

Apr 10, 2007

I want to write a query to bring out any records in a table
where any of its fields contain a null value.  I could do it in this way:
 
select    *

from    
customers
where   name is
null
or         role
 is null
or         email
is null
u003c/p>u003cp styleu003d"margin:0cm 0cm 0pt">u003cfont faceu003d"Times New Roman" sizeu003d"3">u003cfont coloru003d"#000000">However I want to perform a similar function for a number of tables and the method above would mean more sql and maintenance.u003cspan>Â u003c/span>I was hoping there was a simple way to do the same thingu003cspan> ie find any rows with a blank fieldu003c/span>?u003cspan>u003cfont faceu003d"Arial" sizeu003d"2">Â u003c/font>u003c/span>u003c/font>u003c/font>u003c/p>u003c/span>u003c/font>u003c/div>",0]
);
D(["ce"]);

//--> 
However I want to perform a similar function for a
number of tables and the method above would mean more sql and maintenance.  I was hoping there was a simple way to
do the same thing ie find any rows with a blank
field?

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Returning Null Values

Jun 4, 2007

I have a simple table on my webpage which shows data from my database.
It all worked fine apart from one part. I wanted the select statement to select only NULL values from a column, as these are classed as open queries. Once I have closed the query a 0 or 1 will automatically be posted and will no longer have a NULL value.
I have a simple select statement (which I will post on here when I log in with my work computer) and at the end I have a WHERE Column = NULL. I have also tried WHERE column <> 0.0 AND column <>1.0 and that did not work.
If I only did WHERE column <> 1.0, i only get the 0.0 results and none of the NULL results, but if I have no WHERE statement I get all the results including the NULL values.
 
Oliver

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