Null Vs New Record
Feb 19, 2008
Hello Smart People!
This one is driving me nuts. After doing quite a bit of research, I cannot find the answer that I need, so I am posting...
For a new record on frm1 I am trying to make the label (lblTest) for a text box named txtTest a certain color if a value has not been filled in. For some reason, I cannot get the code to work and I am guessing it is due to my lack of understanding of our good old friend NULL. Here is what in both the after update event for txtTest and the on current event for the form...
If Me.txtTest = Null Then
Me.lblTest.ForeColor = 255
Me.lblTest.FontBold = True
Else
Me.lblTest.ForeColor = 0
Me.lblTest.FontBold = False
End If
Why isn't the field red when I create a new record? Why is it that if I fill something into the field, then delete it, that it doesn't get bolded in red?
Regards,
James C.
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Feb 5, 2006
I'm hoping someone can help a noob with a simple problem:) I did a search but couldn't find the answer.
When a user clears a record and leaves it Null I would like to prompt them whether they would like to delete the record before the access error message about invalid use of Null comes up. If they don't want to delete the record then the code should undo the change. The problem I have is I can't seem to run my code without the access error coming up. I can't see where I can trap the error (err.Number 3398).
For example, this doesn't work:
Private Sub txtSalesItem_BeforeUpdate(Cancel As Integer)
On Error GoTo Err_txtSalesItem_BeforeUpdate
Dim response as Integer
If IsNull(Me.txtSalesItem) Then
response = MsgBox("Do you want to delete this category?", vbExclamation + vbYesNo, "Delete Sales Item?")
If response = 6 Then
Runcommand acCmdDelete
else
RunCommand acCmdUndo
endif
End If
.
.
.
I know I can put in a validation rule, but I would like to go a bit further.
Does anyone have any suggestions?
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Oct 14, 2015
Okay so I have a column called 'totalincome' on TblCashflow. There are 60 records of TotalIncome (represents 5 years or 60 months) per asset that I have on another table, TblLoanGeneral.
What I need to return is the LAST value from totalincome that is not null. For example, we may only have entries in the 60 records that go to row #35, or 50 or whatever. When I use the Last criteria it gives me the 60th record (in example would give me a 0), and when I use the Max criteria, it gives me the largest income value regardless of location(would be 50,000 in example). What I need is really where the "last" income amt is >1 (20) however, when you set last, it only considers row 60.In the example below I would want 20 to be returned.
ID
Row#
TotalIncome
1
1
1000
1
2
2500
1
3
50000
1
4
20
1
5
0
1
6
0
1
7
0
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May 2, 2007
Using the sql profiler gives me no clue.
This is the insert query from the profiler.
exec sp_executesql N'INSERT INTO "ENVIS_GSD".."wat_springflow" ("result_dt","site_id","result_va","remark_tx") VALUES (@P1,@P2,@P3,@P4,@P5,@P6)', N'@P1 datetime,@P2 int,@P3 float,@P4 nvarchar(4),@P5 varchar(3),@P6 datetime', 'Feb 10 2009 12:00:00:000AM', 3000723, 8.000000000000000e-001, N'test'
The two records that I get the proplem on are not included here, but somehow they have been updated. I traced the access code, but I could see no reference to them that they were used for the update in either the form or any modules called.
Somehow up to a few weeks ago those two columns were updated.
Tracing the code and using the immediate window the user_name variable stores the login name corectly.
Someone mentioned "error 28" any ideas?
Thanks in advance
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Sep 7, 2005
What I need to accomplish is an alert if a query finds any records. In other words, When the main page is loaded a query will run in the background. This query is looking for any records that need to amended within the next 30 days. What i would like to do is if the query finds any records that need amending an alert "form" or conditional formatting in a field with turn it red as an indicator that attention is needed.
My problem is how do i write a code to see if the record set from the query is greater than null???
any ideas would be greatly appreciated.
Ricky
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Mar 27, 2006
Hi all,
New to this, but found some helpful tips/code already that I've integrated into my project.
You may well be familar the issue tracker database available for download from Office Online, well I'm using this for a little project I'm running.
What I want to do is tie up a few snippets as follows:
1-On my form I have a button called "Close"
2-When I click the Close button I want to check two fields, "closure" and "fix" and ensure that they have content i.e. not null
3-If they have content then I want to alter the "Status" field of the displayed record from Open or Suspended to closed (these are the three options for this field)
4-If the "closure" and/or "fix" fields are empty then I want a msgbox to pop up promting the user to fill out the relevent field/s, otherwise mark the record as closed
So;
Click close button, check contents of two fields, pop up a message if either or both empty, enter details in empty field/s, click button again and as both fields are now complete,mark the records status field as closed.
I've got so far but can't quite tie it all together, is what I'm asking possible? What do you need from me to help answer the question?
Thanks very much for your help.
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May 11, 2015
Nutshell: My user DB has one menu with 4 tabs (2 for adding records, and 2 for searching/editing records). Since the form opens up in the acFormAdd mode, Access already creates a new record (blank) before they type anything. It is resulting in blank false new records that are getting added to the table and they are getting annoying. My audit table is full of "user X created new record at this time" when it's just a blank record.
There must be a way to prevent this using VBA, but I cannot find it.
I've seen ways to disable "add new record" buttons and such, but nothing that disables Access from being smarter than me and creating a new record before I decide to.
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Sep 23, 2014
I've designed a DB in access which has a BackEnd and 2 FrontEnds (one person insert all the records and the others just keep inserting infos till the process is finished.The DB has 12 tables and we used it for about 6 months without having any trouble but recently (2 weeks ago) i've add 3 new tables and then related them to one table that already exist.
The DB was running smoothly for a week after the changes but last monday (09/15) the "Record is deleted" appeared. I've compacted and repaired an the following errors descriptions appeared:
ErrorCode: -1017
ErrorDescription: Record is deleted.
ErrorTable: tblFatura
ErrorCode: -1053
ErrorDescription: Index or primary key cannot contain a Null value.
ErrorTable: tblFatura
ErrorCode: -1630
ErrorDescription: You cannot add or change a record because a related record is required in table 'TblExpense'.
ErrorTable: tblFatura
I've restored the file via IT using the Backup2 days before the error occurred but after 30 minutes the same error appeared! I dont know if it is related to the new tables that i have add or no?
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Jul 11, 2013
On a push of a button from a form, I want to locate specific records within the table and update a field to Null if it matches a name
Dim strSQL As String
strSQL = "UPDATE tblmaster SET Score = "" WHERE [AdvocateName] = 'Anna Maria'"
DoCmd.RunSQL (strSQL)
I'm certain I don't have the syntax correct between the Set to Null and WHERE clauses..
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Oct 2, 2014
If a new record is created, insert date only if customerID is not null
Private Sub Form_Current()
If "CustomerID", "TblDietPlan" = <> 0 Then
If Me.NewRecord Then Me.MealDate = DMax("MealDate", "TblDietPlan")
End Sub
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Dec 6, 2012
I am building a database to capture monthly statistics on a number of items. I want to ensure that users don't enter statistics for the same item for the same reporting period. I found the following instruction, but can't make it work:
It suggests that I create multiple primary keys in the table
When I do it, it comes back with an error: Index or primary key cannot contain a null value.
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Aug 13, 2013
I've created some code that enables a user to copy an existing record to a new record, which looks like this:
Private Sub btnCopytoNewRecord_Click()
Dim Salutation As String
Dim First_Name As String
Dim Surname As String
'Copy fields to variables
Salutation = Me.Salutation
[Code] ....
This code is working fine, until it hits an empty field, and then I get an error message: Run time error '94':
Invalid use of NullIs there some code I can use to tell it to skip any null fields?
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Nov 16, 2014
I do not understand what is happening here. I have foll0wing line in a calculated query field:
m: Switch([EmpID]<5,1) ' run Query 18 in attached example, A2007/2010
this produces 1 for all EmpID<5 and Null for all other EmpID's. All as expected.
But if I do this:
m: Switch([EmpID]<5,1,[EmpID]>=5,Null) ' run Query 19 in attached example
then the entire column is set to Null
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Jul 5, 2013
It might be an easy one but I just wasted the past hour deciphering through my code in order to solve the run-time error '94' that I'm getting when trying to execute the following code:
Code:
Private Sub cmdUpdateDates_Click()
'###################################
'This sub aims at combining the timesheet date and the start and end time into the fields [Start Time] and [End Time].
'###################################
Dim intCounter As Integer
intCounter = 0
Dim rs As ADODB.Recordset
[Code] ....
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Apr 18, 2006
Hello all,
A bit of a weird one, I've got a query and the criteria for showing records is that one particular field is null. However the query is showing records with the values in the field chosen for the Is Null.
Not sure why this is happening, has anyone come across this problem before?
Thanks.
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Apr 3, 2008
I am having problems with setting up a set of combo boxes.
What I am trying to do is if combo Productline is empty then in combo PartNumber would show all products but if combo Productline has a value selected then in the combo partnumber would only be able to select the partnumbers in that productline.
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Nov 16, 2006
Hi, I have some problem with assigmnet with date and string variable. what i wana do is get data from Forms textboxes into variable and then by insert query send to history table.
the problem occurs when there is blank textbox its says invalid use of null.
e.g
myStringVariable = Forms!myform!EmpName
myDateVariable = Forms!myform!EmpDOB
this code is behind the update button which i press when ever i want to shift data to History table
so when the fields are empty the invalid use of null error arrise
any idea how to handle this null specially in date
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Nov 24, 2005
Lock field for a record if another field is null:
I would like to stop users from entering a date in "Ctrl Closed" unless they have populated "Ctrl Reason" for any given record.
Not sure how to do this.
Any ideas would be greatly appreciated.
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Nov 16, 2007
I think the title pretty much sums it up....
I have a query where data is first sorted by user input; first field's criteria: [fieldname], then by another field's criteria: Is Null.
I know there are records containing null values in the second field, as I have run a select query with the criteria: Like "*", to make sure they are null, and not zero-length-strings.
The query is refusing to return any results...
Any ideas?
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Jul 3, 2005
I have created a data base over the last few months I just kept adding information in the fields that I created but now have a problem I have the sections in a drop down menus of which access will let me ad info but when I com to save I get this message
"Index or primary key cannot contain a null value"
Access will not let me save any added info in any field I have tried all the ways that I know to get round this problem to no avail it is most properly some think silly but I am desperate now as I have worked hard on this project.
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Aug 1, 2005
I am using Access to connect to a sybase (symposium) database... I pull records depending on what state the record was pegged.... This is based apon a user inpuyting a code on a telephone. Of the user puts a number that does not reprsent any of our set codes it will show the code feild as blank or null. I need to make this blank feild something representable as furhter down my querys it removes these blanks or nulls. I would like the blank field to be shown as "Bad Code"
Any help would be great...
p.s I have used iif and as and like and nothing is working..
Ta
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Aug 3, 2006
Hy guys!
I would like to know if is any way to inverse the following code:
This:
if isnull (txt1) then 'recognise if the box is empty
to something like this:
if isNotNull (txt1) then 'recognise if the box is not empty
Thanks
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Jul 17, 2007
In response to: http://www.access-programmers.co.uk/forums/showthread.php?t=131593
I personally believe 'NULL' should be banned as a possibility entirely. :eek:
It has been pounded into my head that 'NULL' is not the same as 'EMPTY' or 'ZERO'; and that it literally means 'NOT KNOWN'. Now consider a contact database that has a field for lets say Apt# or Street Direction such as N or S or ?? as an example. There are many, many instances where these fields would be left blank or empy: NULL | NOT KNOWN. When in fact the situation is known: the object has no such attribute; and in query or some other form of program logic the venerable NZ(subject, response) function may be used which would replace the NULL with a value. Or program logic and or error trapping would be used to handle such occasions. Which is an absurd waste of time and talent IMHO.
Therefore, if there is no applicable attribute to enter (something known) why not say so with 'N/A'? Else what we are saying by using 'NULL' is that we are building a dataset containing data that cannot be known. Kind of like saying
This statement is FALSE
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Jul 17, 2007
In response to: http://www.access-programmers.co.uk/forums/showthread.php?t=131593
I personally believe 'NULL' should be banned as a possibility entirely. :eek:
It has been pounded into my head that 'NULL' is not the same as 'EMPTY' or 'ZERO'; and that it literally means 'NOT KNOWN'. Now consider a contact database that has a field for lets say Apt# or Street Direction such as N or S or ?? as an example. There are many, many instances where these fields would be left blank or empy: NULL | NOT KNOWN. When in fact the situation is known: the object has no such attribute; and in query or some other form of program logic the venerable NZ(subject, response) function may be used which would replace the NULL with a value. Or program logic and or error trapping would be used to handle such occasions. Which is an absurd waste of time and talent IMHO.
Therefore, if there is no applicable attribute to enter (something known) why not say so with 'N/A'? Else what we are saying by using 'NULL' is that we are building a dataset containing data that cannot be known. Kind of like explaining:
This statement is FALSE
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Apr 9, 2008
how do I set an entire colum to not accept nulls. example I have a colum that will be checkboxes. I want all the checkboxes to be in the unchecked state.
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Oct 6, 2005
When filtering by form I suddenly get the words: Is Null / Is Not Null appearing in the drop down menu of all fields.
I can then no longer filter at all?
This is carried over to filter by form too!
When I export, or cut and paste the records into my backup database (filters working ok before I do!) the same thing happens!
Can anyone help….please?
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