Handling A Null Datetime Column

Nov 12, 2007

can anybody tell me how to do a select query on a datetime field where if i have a null value in that column, i need to display a some character.

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Handling A NULL Datetime In DATEDIFF()

Jan 28, 2008

 I want to select records where AnswerDate is within 30 days of today, and include records that have a NULL AnswerDate.
How can I tell DATEDIFF to treat NULL as Today?  (I think I am looking for something like VBA's nz() function.) 
 
SELECT RegistrationID ,  
AnswerDate, 
(DATEDIFF(dd,AnswerDate,GETUTCDATE())) AS InvitationAge
FROM Registration
WHERE (DATEDIFF(dd,AnswerDate,GETUTCDATE())) <= 30
 
Thanks

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How To Install A Null Value Into A DateTime Column Via A TableAdapter?

Feb 8, 2007

Hi,I have a table adapter that I am using to call a stored procedure on a SQL server database to insert a record.Everything works ok, except I cannot figure out how to pass a null value to a DateTime field.  In my SQL server database, the column allow nulls.  In my typed dataset, the column is set to allow nulls.When I try to run the insert procedure with a null value: ListTableAdapter da = new ListTableAdapter();
da.InsertList(System.Data.SqlTypes.SqlDateTime.Null, Name); I get this error: Error    14    Argument '1': cannot convert from 'System.Data.SqlTypes.SqlDateTime' to 'System.DateTime?I've also tried passing it DBNull.Value, but I get an exception with that too.Can anyone steer me in the right direction with this?

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Transact SQL :: Calculate DateTime Column By Merging Values From Date Column And Only Time Part Of DateTime Column?

Aug 3, 2015

How can I calculate a DateTime column by merging values from a Date column and only the time part of a DateTime column?

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Handling Null Dates

Feb 8, 2008

Hi, I have a database field for completion dates - until a task is completed, there is no date and at the moment I have null values in this field.My problem arises when searching the records.  I have a search form which passes parameters via a query string to a SqlDataSource.  The SqlDataSource has the CancelSelectOnNullParameter set to true, so if any fields on the search form are left blank, they are ignored.  For other dates, my sql query contains something like  (Job.EnteredAt < ISNULL(DATEADD(d, 1, @EntTo), '2099-01-01')) This approach doesn't return any records for the completion date as there is no date to compare to the '2099-01-01'.Can anyone give me any tips on how I should handle this?  I'm willing to change my structure, search page or sql query!Thanks, Neil 

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Handling NULL Values.

Oct 19, 2007

Hi,

I would like to know the solution for the below problem.

Actually I have a single Hibernate xml file which has the query on it. And I am accessing the xml file for SQL server 2005 and Oracle 10G. But the query is working in Oracle and not working in SQl Server.

I noticed from the query that handling 'NULL' is the problem.

Findings:
1. The following query is the same in both Oracle and SQL Server, which is causing the Issue.
SELECT *
FROM CLIENT_SKU AS o
WHERE o.OU_ID = 20000000
AND ((o.CLIENT_SKU_START_CODE <= 'wwwww' AND o.CLIENT_SKU_END_CODE >= 'wwwww')
OR (o.CLIENT_SKU_START_CODE <= '' AND o.CLIENT_SKU_END_CODE >= '')
OR (o.CLIENT_SKU_START_CODE >= 'wwwww' AND o.CLIENT_SKU_END_CODE < '')
OR (o.CLIENT_SKU_START_CODE = 'wwwww' AND o.CLIENT_SKU_END_CODE is null))

CAUSE:
Oracle treats NULL and the empty string almost the same making the latter almost an alias for NULL
The following two statements produce identical results:
1. update employee set lastname = ''
2. update employee set lastname = NULL
In our case, the CLIENT_SKU_END_CODE is an empty string which is being checked with an empty string returns False in Oracle where as returns True in Sql Server causing the issue.

It would be great if any one who can give some possible solution to resolve the same.

Thnx

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Handling Null Date Values

Jun 30, 2000

I would like some suggestions on how to keep from displaying the value "1/1/1900" on my asp pages when my recordset field returns a Sql date value that is null

Thanks for any tips
Jim

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Null Value Handling In SSIS Package

May 24, 2007



Hi All



I am facing this problem while loading data from text file into Table.

Scenario is -



There are chances of having spaces for null values in text file.



when i m trying to rum my SSIS package this is getting failed.



How can i avoid this problem? i want null values to be inserted if ther is spaces for that field in text file.



Thanks,

Anshu

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Handling Null Fields With Three-tier Architecture

Nov 28, 2006

I using Visual Web Designer Express (with Visual Basic), with a SQL Server 2000 database.   I have a prototype application running satisfactorily using code that builds queries, but I'm now trying to rebuild the application "properly" using three-tier architecture.  I have been following the principles of Scott Mitchell's tutorials.  I have created an database .xsd with a table adaptor, and replaced the rather grotty query-building code in the business layer with better code referencing the table adaptor.   Thus where the first version had code: -
        Dim queryString As String = "SELECT * FROM NZGDB_User WHERE USRid = '" & Userid & "'"        Dim message As String = ""        Dim Found As Boolean = False        Try            Using connection As New SqlConnection(GDB_AppSettings.Connection)                Dim command As New SqlCommand(queryString, connection)                connection.Open()
                Dim reader As SqlDataReader = command.ExecuteReader()
                If reader.Read() Then                    Found = True                    _USRid = reader("USRid")                    _USRPassword = reader("USRPassword")                    _USREmail = reader("USREmail")                    _USRTitle = reader("USRTitle")                    _USRName = reader("USRName")                    _USRRole = reader("USRRole")                    If IsDBNull(reader("USRAgreedConditions")) = False Then                        _USRAgreedConditions = reader("USRAgreedConditions")                    End If                End If                reader.Close()            End Using        Catch ex As Exception            If Left(Err.Description, 68) = "An error has occurred while establishing a connection to the server." Then                Return "Cannot open database to logon"            Else                Return Err.Description            End If        End Try
the new version is much more elegant: -
        Dim taUser As New NZGDBTableAdapters.NZGDB_UserTableAdapter()
        Dim tbUser As NZGDB.NZGDB_UserDataTable = taUser.GetUserByUserid(userid)        If tbUser.Count <> 1 Then   '   Anything other than 0 or 1 should be impossible            Return "User not found"        End If
        Dim trUser As NZGDB.NZGDB_UserRow = tbUser(0)        _USRid = userid        _USRPassword = password        _USREmail = trUser.USREmail        _USRTitle = trUser.USRTitle        _USRName = trUser.USRName        _USRRole = trUser.USRRole        _USRAgreedConditions = trUser.USRAgreedConditions
However, there is a problem.  The database field USRAgreedConditions is a Datetime field that can be null.  The new version works perfectly when it is NOT null, but throws an exception: -
System.Data.StrongTypingException was unhandled by user code  Message="The value for column 'USRAgreedConditions' in table 'NZGDB_User' is DBNull."  Source="App_Code.wt2vzoc1"  ....
There is no point in writing: -        If Not IsDBNull(trUser.USRAgreedConditions) Then            _USRAgreedConditions = trUser.USRAgreedConditions        End Ifbecause the exception occurs within the automatically-created code in the data access layer.  I tried changing the Nullvalue property of the field USRAgreedConditions in the table adaptor, but the only valid option is (Throw Exception) unless the field is a String.  Of course USRAgreedConditions is a Datetime field, so I can't change the property.
It seems that my only options are: -1.   To stick with the old query-building code.   But this doesn't give me the advantages of a proper 3-tier architecture2.   To change the generated code in wt2vzoc.  This MUST be a bad idea - surely I should leave this code untouched.  Besides, what if the table adaptor has to be regenerated when I change the table design?3.   Code a Try block within the business layer: -    Try         _USRAgreedConditions = trUser.USRAgreedConditions    Catch ex As Exception         _USRAgreedConditions = Nothing    End Try
This seems to work OK, but seems less elegant than the original code in the old version: -       If IsDBNull(reader("USRAgreedConditions")) = False Then            _USRAgreedConditions = reader("USRAgreedConditions")       End IfIs there a better way?

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Millisecond Values Missing When Inserting Datetime Into Datetime Column Of Sql Server

Jul 9, 2007

Hi,
I'm inserting a datetime values into sql server 2000 from c#

SQL server table details
Table nameate_test
columnname datatype
No int
date_t DateTime

C# coding
SqlConnection connectionToDatabase = new SqlConnection("Data Source=.\SQLEXPRESS;Initial Catalog=testdb;Integrated Security=SSPI");
connectionToDatabase.Open();
DataTable dt1 = new DataTable();
dt1.Columns.Add("no",typeof(System.Int16));
dt1.Columns.Add("date_t", typeof(System.DateTime));
DataRow dr = dt1.NewRow();
dr["no"] = 1;
dr["date_t"] = DateTime.Now;
dt1.Rows.Add(dr);
for(int i=0;i<dt1.Rows.Count;i++)
{
string str=dt1.Rows["no"].ToString();
DateTime dt=(DateTime)dt1.Rows["date_t"];
string insertQuery = "insert into date_test values(" + str + ",'" + dt + "')";
SqlCommand cmd = new SqlCommand(insertQuery, connectionToDatabase);
cmd.ExecuteNonQuery();
MessageBox.Show("saved");
}
When I run the above code, data is inserted into the table
The value in the date_t column is 2007-07-09 22:10:11 000.The milliseconds value is always 000 only.I need the millisecond values also in date_t column.
Is there any conversion needed for millisecond values?

thanks,
Mani

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Cannot Insert The Value NULL Into Column 'OrderID' -- BUT IT IS NOT NULL!

Apr 2, 2007

I am getting this error: "Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails." -- But my value is not null. I did a response.write on it and it show the value. Of course, it would be nice if I could do a breakpoint but that doesn't seem to be working. I'll attach a couple of images below of my code, the error, and the breakpoint error.
 

 
 

Server Error in '/' Application.


Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.Source Error:



Line 89: sContact.Phone = sPhone.Text.Trim
Line 90: sContact.Email = sEmail.Text.Trim
Line 91: sContact.Save()
Line 92:
Line 93: Dim bContact As Contact = New Contact()Source File: F:InetpubwwwrootOutman KnifeCheckout.aspx.vb    Line: 91 Stack Trace:



[SqlException (0x80131904): Cannot insert the value NULL into column 'OrderID', table 'outman.outman.Contact'; column does not allow nulls. INSERT fails.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +857354
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734966
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +1838
System.Data.SqlClient.SqlDataReader.HasMoreRows() +150
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +214
System.Data.SqlClient.SqlDataReader.Read() +9
System.Data.SqlClient.SqlCommand.CompleteExecuteScalar(SqlDataReader ds, Boolean returnSqlValue) +39
System.Data.SqlClient.SqlCommand.ExecuteScalar() +148
SubSonic.SqlDataProvider.ExecuteScalar(QueryCommand qry) +209
SubSonic.DataService.ExecuteScalar(QueryCommand cmd) +37
SubSonic.ActiveRecord`1.Save(String userName) +120
SubSonic.ActiveRecord`1.Save() +31
Checkout.btnCheckout_Click(Object sender, EventArgs e) in F:InetpubwwwrootOutman KnifeCheckout.aspx.vb:91
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102



Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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DB Engine :: Not Able To Make Column To Null Value From Not Null

May 13, 2015

It's giving me an error while I'm trying to change column value from not null to null..

'tblid' table
- Unable to modify table.  

Cannot insert the value NULL into column 'ValidID', table 'Xe01.dbo.Tmp_tblid'; column does not allow nulls. INSERT fails.

The statement has been terminated.

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Insert NULL Value Into DateTime

Dec 11, 2006

Does anyone have a simple way of inserting a NULL value into sql 2000 datetime. I'm using vb.net.
All I want is if the user does not enter a date in a textbox to to send a NULL value to the DB instead of having the db enter the default value as 1/1/1900.
Thank you

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DateTime Parameter With NULL Value

Apr 8, 2008

Hi,
I have a report with datetime parameter which is required to be optional (there should be an option not to select this parameter which would cause in not narrowing result of this report by this parameter).

I used datetime parameter (to have the calendar control for selecting date) for which I enabled NULL value. The result is that next to this parameter there is a checkbox "NULL" which allows to send NULL as a value of this parameter. Everything is fine except for the prompt: "NULL"... Is there a way to change it? I would see there something like "Empty" or "Not selected", which would be understandable for users of the report.

Or is there any other way to send an empty date as a value of this parameter? (Setting some unusual value like 1/1/1900 for empty date is not sufficient as the empty value shouldn't appear in the parameter control).

Thank you,
Michal

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INSERT NULL Value + DateTime

Dec 10, 2007

Hi,

If a datetime variable is empty I want to insert null into the database table.

How do i do this? Below code doesn't work. Get this error...
Cannot implicitly convert type 'System.DBNull' to 'System.DateTime'




Code Block
if (myDataGridView.Rows[iRow].Cells["myDateDataGridViewTextBoxColumn"].Value.ToString() != "")
{
myDateReport = DateTime.Parse(myDataGridView.Rows[iRow].Cells["myDateDataGridViewTextBoxColumn"].Value.ToString());
}
else
{
myDateReport = DBNull.Value;
}

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Set NULL To Datetime Parameter

Dec 14, 2006

Hi All,

I have a problem while trying to set "NULL" value to my datetime parameters.

I have two datetime parameters (AllowNull=True) on my report. (BeginDate and EndDate)

it works fine in preview mode in reporting design.

The problem occurs, if I try to set an emtpy value to these parameters in my asp.net application.

The code looks like;

Dim repParams(1) As ReportParameter

repParams(0) = New ReportParameter("BeginDate", String.Empty)

repParams(1) = New ReportParameter("EndDate", String.Empty)

-----

ReportParameter method requires String parameters. If user set any datetime value, I am sending "String.Empty" value to my paramaters in order to set them as NULL. But I am getting "rsReportParameterTypeMismatch Error."

How Can I set NULL value to these parameters from asp.net application?

Thans alot in advance.

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Inserting NULL Into Datetime Field

Aug 17, 2007

I have a datetime field in a database which I am programmatically inserting values into. The field can be null or not null. However, I am having problems inserting NULL as part of my SQLCommand.
The value is pulled from a text box (linked to a calendar extender) and when I select a value it is being inserted fine. If I just leave the box blank though, I want the field to be set to NULL. I have tried adding in ,DBNULL.Value, as part of my VALUES(…) string, but this throws an exception. I Have tried just inserting ‘’ but that also throws an exception (“The conversion of a char data type to a datetime data type resulted in an out-of-range datetime valueâ€?), so I don’t know how I can insert this value when the field is blank? 
Can anyone shed some light please? Thanks
 

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Xsd Files And Null Datetime Columns

Feb 5, 2008

Ive created a Data Access Layer (xsd file) and some of the tables have DateTime columns.  I need to allow NULL values to be saved, but when I try to do that I get an error
In my code (c#) ive used Nullable DateTime, but when I try to assign a nullable Datetime to a DateTime column, I get this error
cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'
I understand the reasons why, so how do I save null DateTime values to the underlying database through a schema ?
In the schema file, the DateTime columns have <DBNULL> as the default value, AllowBDNull is true, but I am only allowed 'Throw exception' on the NULL value property
I could probably do this another way (by not using a schema and writing the code myself)  but Id prefer to keep the strongly typed code.
 I dont want to use MAx or MIn values for the default datetime values, so how can this be done ?

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DateTime Null In Sql Server Database

May 11, 2005

Hi,
I'm using this source code in order to set the DateTime field of my Sql Server database to null.I am retreiving dates from an excel sheet. If no date is found, then I set my variable myDate to DateTime.MinValue then i test it just before feeding my database.
I have an error saying that 'object' does not contain definition for 'Value'.
In french : Message d'erreur du compilateur: CS0117: 'object' ne contient pas de définition pour 'Value'dbCommand.Parameters["@DateRDV"].Value = System.Data.SqlTypes.SqlDateTime.Null;
The funny thing is that in the class browser i can see the Value property for the class Object...
C#, asp.netstring  sqlStmt ; string  conString ; SqlConnection cn =null; SqlCommand cmd =null; SqlDateTime sqldatenull ; try{sqlStmt = "insert into Emp (Date) Values (@Date)  ";conString = "server=localhost;database=Northwind;uid=sa;pwd=;";cn = new SqlConnection(conString);cmd = new SqlCommand(sqlStmt, cn); cmd.Parameters.Add(new SqlParameter("@Date", SqlDbType.DateTime));sqldatenull = System.Data.SqlTypes.SqlDateTime.Null; if (myDate == DateTime.MinValue) {cmd.Parameters ["@Date"].Value =sqldatenull ;}  else{cmd.Parameters["@Date"].Value = myDate;}cn.Open();cmd.ExecuteNonQuery();Label1.Text = "Record Inserted Succesfully";}catch (Exception ex){Label1.Text = ex.Message;}finally{cn.Close();}

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Cant Insert NULL To DateTime Field

Jun 5, 2006

Hi I'm using DetailView and I have a text box which show the date. I have formated the date as shortDate {0:d} format. I want to insert/update null if that text box is empty.
I have tried putting null value in my Update statement in sqlDataSource. And I'm getting error saying can't convert varchar to smalldatetime.
If I don't set null value as above, some large date (01/01/2033) has been inserted in my database.
Can anyone help me?
Moe

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Feb 10, 1999

I have defined fields in a table as datetime fields and allow nulls. SQL 6.5 is placing 1-Jan-1900 in all of these fields causing me to have to filter out these dates when retrieving a recordset.
How do I get rid of this?


thanks!

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Aug 28, 2006

Hi. I wrote a sproc to insert values from a tab-delimited text file into SQL 2005. There is a column in the text file that contains datetime values. Some of the values may be null. I have defined my sproc as:[CODE]createproc [dbo].[spInsertTransactionData]@LoadTransactionCode tinyint,@AccountNumber char(19),@PostingDate char(8) = '01011900'asinsert into table1( LoadTransactionCode, AccountNumber, PostingDate)values(@LoadTransactionCode,@AccountNumber,cast(stuff(stuff(@PostingDate, 3, 0, '/'), 6, 0, '/') as datetime)) [/CODE]I am getting the error:"The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value."When I step into the sproc, I see that the problem arises when the code encounters a "blank" value for PostingDate.As always, thanks for the help!

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Integration Services :: Handling Variable Column Inputs

May 18, 2015

I receive a data feed from a third party in a pipe delimited file.  From time to time, they add a column at the end.  I would like my ssis package to continue to process the data even if they add a column with out it breaking. How best do I handle this situation?

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Aug 8, 2006

Hi there ;
This Problem is goin to make me crazy!
I've got a table with couple of fields, 2 of them are DateTime, in Sql Express 05 .
I used asp.net 2.0 to insert datetime values, directly,  using sth like DateTime.Now.ToString() .
i use 2 selects as follows :
1)select * from X where  Date1='8/9/2006 11:17:41 AM'
2)select * from X where  Date2='8/9/2006 11:17:41 AM'
#1 is OK, but the second one returns a row with all columns set to NULL .
(X is the name of the table)
Thanks in advance

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How Do You Handle Null DateTime Values From SQL Server?

Aug 17, 2005

If myDateTimeColumn contains a <NULL> value.  How do you handle that when reading into a DateTime object in your code?DateTime myDate = Convert.ToDateTime(dr["myDateTimeColumn"]);Does not work, it throws: System.InvalidCastException: Object cannot be cast from DBNull to other types.
I am curious as to what others are doing to handle this?

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Null Values In Datetime Fields, Howto?

Jul 12, 1999

Hi,
When I try to insert a new record into a table that has a datetime field that allows nulls, a default 01/01/1900 date is inserted instead of null. I recreated the table and set the datatype to smalldatetime and I still get the error. What have I missed?

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Nov 3, 2005

In a VB.NET script, I am adding the dbnull value to a parameter that will populate a smalldatetime column:
cmd.Parameters.Add("@unitHdApprove", System.DBNull.Value.ToString)

The stored procedure then defines the input as smalldatetime:
@unitHdApprove smalldatetime,

However, the result is that the record is inserted with 1/1/1900 as the date value, instead of <NULL>.

I'm guessing that this occurs because the conversion of a '' to date will return 1/1/1900, and VB requries the parameter value to be a string (at least with this syntax), so System.DBNull.Value.ToString really equals ''.

I've rewritten the proc to accept the date as a string instead, and then for each date, cast it to a smalldatetime or set it to null as is appropriate. But this is a really bulky way to do things with more than a few dates! Is there any way to change what is in my VB code so that the procedure will insert the actual null value?

Thanks,
Sarah

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Jul 9, 2007

Hi,



I have a flat file source and am bringing it into an OLE DB Destination connected to a SQL Server 2005 database. Since I am bringing in the data via a flat file, I have a conversion step in the data flow, which uses a "Data Conversion" transformation to convert each column to the appropriate destination data type.



When I run my SSIS package, if the datetime column in the flatfile is NULL, then the Data Conversion step fails. I have my Data COnversion step set to redirect error rows to an error output. So, I get all the rows with populated datetime values in the intended destination, and none of the rows with null datetime values (these go to the error destination.)



This is a problem! I need to make sure all valid rows fall through. It seems very odd to me that a NULL datetime could not be converted to a datetime data type. This makes no sense, since a datetime column can naturally hold NULL, just like any other type. So, my question is: is this a bug??? It seems to me it is. I can't believe this would be the desired behavior?!



Microsoft: please let us know whether this is expected behavior. If so, then what would the desired workaround be?



Thanks

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Apr 27, 2007

Dear folks,
please tell me the query for altering a column from not null to null

Vinod

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Feb 28, 2008

Hi all,

One of my columns is the table has some Null values, and I Would like to stop having NULL values into that column any more.

I know, If I alter the column to NOT NULL will throw me an error, since it does a batch update.

Is there any way to achieve this...

Thanks...

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Feb 29, 2008

Hi all,


One of my columns is the table has some Null values, and I Would like to stop having NULL values into that column any more.


I know, If I alter the column to NOT NULL will throw me an error, since it does a batch update.


Is there any way to achieve this...


Thanks...

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Apr 7, 2006

How to replace DateTime field with null value in SQL 2005 server
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create aa  @CreateDate DatetimeAsUpdate cw set CreateDate=@CreateDate
 
 

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Feb 13, 2007

Hi

I have a really simple query which i can't figure out why its not working. I have a table called 'ADMIN' which has a datetime field called 'date_edited'. Because the majority of records have never been edited, i have allowed null values and they are filled with 'NULL' in each record. How ever, when i try:

SELECT * FROM ADMIN WHERE date_edited = NULL

I get no records, but i can see and know i have hundreds! I know i'm doing somthing really stupid, but for life of me can't figure it out! :eek:

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