Access VBA Statement To Check For Null Entries
Jan 24, 2012
I've built a form on my Access database that invites a user to enter a start date and an end date into two textboxes. When i press a command button, a parameter query runs which uses the two textboxes as the parameter's criteria. However, to ensure that both textboxes have a data entry, i have tried entering in some VBA that prompts the user to enter in a date if its left null...then set focus to that textbox: Here it is...
If IsNull(Me.txtWeight1) Then MsgBox "You must enter a minimum weight!"
Me.txtWeight1.SetFocus
Else
If IsNull(Me.txtWeight2) Then MsgBox "You must enter a maximum weight!"
Me.txtWeight2.SetFocus
Else
If IsNull(Me.txtWeight1) And IsNull(Me.txtWeight2) Then MsgBox "You must enter a min and max weight!"
End If
This will not compile for me! I've tried with and End If and without an End If and other stuff. Why won't it work?
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May 17, 2006
I have a problem where in a table called tblPatientLanguage
that contains three fields
PatientLanguageID
PatientID
LanguageID
a patient who is identified by PatientID can speak several languages
identified by the LanguageID.
The problem is with my current form and code
For Each varSelected In Me!lstLanguage.ItemsSelected
rs.AddNew
rs("PatientID") = [Forms]![frmPatientDemographics]![PatientID]
rs("LanguageID") = Me!lstLanguage.ItemData(varSelected)
rs.Update
Next varSelected
when the user click on the command button called cmdOK it will put the
data in the table "tblPatientLanguage" and corresponding fields. without
checking to see if there is already a duplicate languageID that corresponds to the
same patientID in the table
This has lead to duplicates in the table
example
PatientID = 9
if I look in the table I will see 7 entries that say
PatientID = 9 and LangaugeID = 7
I want to prevent this from happening with and if statement
I could make both the PatientID and LanguageID primary keys
this would prevent this from happening. But I would rather do it in
the VBA code? This way in will move thorugh the selections without poping an error and the person inputing the date. Any ideas sorry for being long winded. I attached the
database.
PS. If looking at the database you have to use form frmPatientDemographics and click on the language link
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May 9, 2014
I have a form in my Access database that has 3 input boxes by which a user can locate a record by. The problem I am running into is that I can not get a nested IF statement to work properly to first check which of the search boxes are filled in and second search by whichever is filled in. I have come up with the following code that seems to be only searching by the first input box. If the first input box is blank it does not move to the second or third numbers so I imagine there may be something wrong with the order of my IF statement or the syntax is off.
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Jul 31, 2007
Im trying to concatenate a bunch of fields (50 arghh) which each are either blank or just contain one letter. This was someone elses setup for an attendance register which I think is an odd way of doing it. I would have used one field and then to get the mark for a week take a substring at the appropriate position. Anyway im trying to replace an empty string field with a letter to represent the register hasn't been marked using sql statement:
SELECT [400 Student Marks].acad_period, [400 Student Marks].student_id, [400 Student Marks].register_id, [400 Student Marks].register_group, Replace([1],"","U") AS attendance
FROM [400 Student Marks];
[1] being the first register week then I would have concatenated with [2] etc...
This however causes an error each time on the attendance field so im guessing replace doesn't work on empty strings. Is there a way round this/alternative.
Thanks for any advice.
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Jun 24, 2005
I have a Qry that has a criteria of
Like "*" & [Forms]![FrmSearch![Cmbo1]
However on this field there are null field entries and even if the cmbo box is null it wont display these results.
I tood out the & [Forms]![FrmSearch![Cmbo1] section and just left the wild card and again only displayed the records where this field had an entry.
How can i get it so that when no selcetion has been made in the combo box all the records show up.
Many Thanks
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Mar 3, 2007
Hi, first of all I have to say I'm quite a noob at Access, so I apologise if my question seems stupid. :p I Googled for quite a bit looking for a solution but couldn't really get anything to work (maybe because I wasn't doing some of the possible solutions correctly?).
Anyway, I have a database with two tables, and I'm trying to make a QBF to search for data from these two tables. Quite a few of these entries have null values.
SELECT [M-Table].Firstc, [M-Table].Secondc, [S-Table].Thirdc
FROM [M-Table] LEFT JOIN [S-Table] ON [M-Table].Firstc = [S-Table].Firstc
WHERE
((([M-Table].Secondc) Like "*" & [Forms]![interface]![TxtSecondc] & "*")
AND (([Forms]![interface]![TxtFirstc]) Is Null)
AND (([Forms]![interface]![TxtThirdc]) Is Null))
OR ((([M-Table].Firstc) Like "*" & [Forms]![interface]![TxtFirstc] & "*")
AND (([Forms]![interface]![TxtThirdc]) Is Null)
AND (([Forms]![interface]![TxtSecondc]) Is Null))
OR ((([S-Table].Thirdc) Like "*" & [Forms]![interface]![TxtThirdc] & "*")
AND (([Forms]![interface]![TxtFirstc]) Is Null)
AND (([Forms]![interface]![TxtSecondc]) Is Null))
OR ((([M-Table].Firstc) Like "*" & [Forms]![interface]![TxtFirstc] & "*")
AND (([M-Table].Secondc) Like "*" & [Forms]![interface]![TxtSecondc] & "*")
AND (([Forms]![interface]![TxtThirdc]) Is Null))
OR ((([M-Table].Secondc) Like "*" & [Forms]![interface]![TxtSecondc] & "*")
AND (([S-Table].Thirdc) Like "*" & [Forms]![interface]![TxtThirdc] & "*")
AND (([Forms]![interface]![TxtFirstc]) Is Null))
OR ((([M-Table].Firstc) Like "*" & [Forms]![interface]![TxtFirstc] & "*")
AND (([M-Table].Secondc) Like "*" & [Forms]![interface]![TxtSecondc] & "*")
AND (([S-Table].Thirdc) Like "*" & [Forms]![interface]![TxtThirdc] & "*"))
OR ((([M-Table].Firstc) Like "*" & [Forms]![interface]![TxtFirstc] & "*")
AND (([S-Table].Thirdc) Like "*" & [Forms]![interface]![TxtThirdc] & "*")
AND (([Forms]![interface]![TxtSecondc]) Is Null));
This really long and tedious code was the only way I could get it to work such that in my query form, if I leave any one of the fields blank the search will still pull all the related results out, regardless of whether there are nulls in the values themselves, e.g. if I search for anything with "ab" in Secondc, it will give me all the data with "ab" in Secondc, even if there are null values for those entries in Firstc and Thirdc. Similarly for searches with the other fields.
I tried using IIF and Nz, first using IIF under Criteria, then I read somewhere that they should be used under Field rather than Criteria, but I couldn't really get it to work. Either the QBF wouldn't return any results, or it would return only those entries without null values, so if I searched for "ab" in Secondc, I wouldn't get the entries that had "ab" in Secondc but null values in either Firstc or Thirdc.
The problem with my solution is that I wouldn't be able to get it to work in another database with like 10 fields. The number of combinations would be a killer...
Is there any workaround? Many thanks! :)
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Jul 29, 2013
I have a form that feeds information to a query which in turn sets up a report. For clarity i will list out in basic terms what I have
Input Form
- Check Box to activate/De-activate a text field [chk-active]
- Text field for a parameter [txt-Parameter]
the query has a column that has null values from the originating table. These values will be added a t a later date, but need to be queried and reported at some business intervals.
In the query criteria for this column, I have the following Criteria
Like IIF([Forms]![ReportGenerator]![chk-Active]=0, "*", [Forms]![ReportGenerator]![txt-Parameter])[/I][/I]
I have tried for the last 5 hours to figure out how to write the formula to be able to get the blank entries to show up as well but have had no luck.
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Nov 15, 2005
Hi there
I have some a little programing in microsoft access vb and so I am here asking for advice.
I need to copy a data value from one field down the list of null entries till it reaches the next value and then use that an so on in a loop.
E.G
[Area Code]
199a
null
null
null
null
132f
null
null
null
Regards
Luke
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Jul 31, 2013
I have a Membership List Table with a calculated field entitled Member Name.
The second table entitled Groups contains only 46 records each of which has up to 30 Fields also containing member names.
I Have written a query to establish which of the members from the single field of the first table do NOT featured in any of the fields and records of the second table. In the Query Design View I have listed 'Member name' from Table 1 followed by all the relevant member fields from Table 2, carrying the criteria 'Is Null'.
When I run the query, it merely lists all the members from Table 1.
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Aug 30, 2005
I'm pretty new to Access, so please overlook any stupid questions :)
I have a data entry form that has one field that cannot be a duplicate. So, in the table I have it Indexed with No duplicates.
The problem is that the form doesn't notify the user that they have entered duplicate information until they close the form. So the 10 minutes they spent filling it out is wasted.
So, after consulting various posts, I did a BeforeUpdate event with the following code:
(the field that must be unique is called "LS Number", in the form "Q and D" based on the table "Q and D Database")
Private Sub LS_Number_BeforeUpdate(Cancel As Integer)
On Error GoTo LS_Number_BeforeUpdate_Err
If (DLookup("[LS Number]", "Q and D Database", "[LS Number]=Forms![Q and D]![LS Number]")) Then
MsgBox "The LS Number you entered already exists. Enter a unique LS Number", vbInformation, "Duplicate LS Number"
End If
LS_Number_BeforeUpdate_Exit:
Exit Sub
LS_Number_BeforeUpdate_Err:
MsgBox Error$
Resume LS_Number_BeforeUpdate_Exit
End Sub
When I test this by entering a duplicate LS Number, it gives me the error "Type Mismatch." Unfortunately, I have no idea what this means, nor do I know how to fix it.
Please help, my head hurts!
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Sep 28, 2012
I have a login form. 2 spots for users to input and ID and their name. I want to do error checking to see the user inputs a wrong name or wrong id with their corresponding name or ID. For example, I don't want User A to be able to login with User B's name. If User A inputs their ID and inputs User B's name, I want to show an error message stating the their is a mismatch of credentials. Here is my code
Private Sub Command12_Click()
Dim rs As DAO.Recordset
Dim txtID As Variant
txtID = Forms![LoginForm2]![txtEmployeeID]
txtName = Forms![LoginForm2]![Text13]
Set rs = CurrentDb.OpenRecordset("SELECT * FROM CoachTable WHERE EmployeeID = '" & txtID & "'", dbOpenDynaset)
[Code] .....
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Oct 11, 2004
How (in VB) do you "check" to see if the user has selected an item from a listbox? I've searched the forums and tried everything I know and I keep getting: "Invalid Use of Null"
Any Ideas?
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Oct 23, 2006
Hello,
I am putting a check whether the inputted value in a text box(txt_id) is filled or not. If it is 'null' then it should not execute the insert statement but somehow the check for the null value is not working. Can someone tell me why??
Private Sub cmd_inserer_Click()
If txt_id.Value = Null Or txt_id.Value = "" Or txt_id.Enabled = False Then
info = MsgBox("Veuillez remplir champ « Id »", vbInformation)
ElseIf txt_id.BackColor = &HFF& Or txt_libelle.BackColor = &HFF& Or txt_description.BackColor = &HFF& Then
info = MsgBox("Veuillez remplir tous les champs fausses!", vbInformation)
Else
MsgBox txt_id.Value
Set db = CurrentDb
strSQL = "INSERT INTO objectif ( id , libelle,description) values ('" & txt_id.Value & "' , '" & txt_libelle.Value & "','" & txt_description.Value & "') ;"
db.Execute strSQL
db.Close
Form_objectif.Requery
txt_id.Value = ""
txt_libelle.Value = ""
txt_description.Value = ""
cmd_ajouter.Enabled = True
cmd_modifier.Enabled = False
End If
End Sub
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Apr 24, 2013
I am trying to using an iif statement to pick up null values, but I don't know what to type in the function. I tried using "is null", but got an invalid message.
What value I should type in to get null value in the function below?
IIf([popi_r2a] is null","",[popi_r2a])
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Jun 8, 2014
After hours of playing around i finally have my IIF statement working the proplem is now is that when the Value is null it gives a blank value on my Report. How do i get it to show the value of 0 when it is Null. can i use an isNull withen my IIf statement maybe nested what is best practice?
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Feb 10, 2008
I need to add a Yes/No field to a table. I know I can do this in design view. Next I want to loop through the table and set it to Yes if certain fields are null. What I need help with is the VBA looping part and setting the boolean field to Yes if the fields being checked are null.
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Oct 8, 2013
I have this IIF statement however all empty cells are also coming up as Expired. How do I exclude empty cells?
Status: IIf([Expiration Date]>= Date() ,"CURRENT"," EXPIRED")
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Jan 13, 2014
I have form that user can filter the records and generate a report but I have difficult trying filter null date.
If I have check box called filter null if it has a tick in I would like it only show records that have no value (is null) in field "date start" but if unticked I would like it to only show records with a date in field "date start" ...
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May 1, 2013
how to run a report to show a Client if one or of the following fields are blank or unchecked(Yes/NO?
Fields
Client
Assessment Date(Null)
Placement Fee Paid(Check Box)(No)
TJ Completed(Check Box)(No)
So basically, if one of the above fields are null or unchecked, please show in the report. I'm sure it's easy but to do, but not up on coding.
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Aug 30, 2013
I have a form with two list boxes on it: listAllBANANA and listActiveBANANA
The listboxes are populated from tblBANANA. Active is defined by the tblBANANA field "ResponseDate" being Null.
Also on the form is a CloseBANANA command button. When pressed with no selection, it opens frmCloseBANANA to the first record. If a BANANA is selected in listActiveBANANA, the form opens to the selected record.
Now comes the tricky part: if a BANANA is selected in listAllBANANA, I first need to verify they have an Active BANANA selected, before opening the form. I've poked and tested and searched and cut and pasted my little fingers off with no joy. What I've deduced is that I'm either messing up the syntax of the DLookup or I'm incorrectly referencing the selected record. There's also the third option that I'm going about this in entirely the wrong way.
All other code below works. If I delete or comment out the line in red, I have no issues other than I may open up a blank form because I'm trying to close a BANANA that is already closed.
Code:
'If a BANANA is selected in Active BANANA or All BANANA, open Close BANANA to that record. If not, open form to most recent record
Private Sub cmdCloseBANANA_Click()
If Not IsNull(Forms!frmGUI!listActiveBANANA) Then
[Code] .....
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Dec 29, 2014
I have a report based on a query with 3 fields (Tested, RMA, OpenRMA). The query searches all the tables in my database and gives me a count of the equipment tested, RMA reported and open rma.
The report has two fields (Equipment, NumberTested) with a total below and also a total of the RMAs and OpenRMAs. I'm trying to hide RMAs and OpenRMAs from appearing in the body and only showing below the total. All three totals are showing correctly, but I am still seeing RMA and Open RMA with a null in the count in the body.
So in the report's Equipment.control I wanted to put
Iif([NumberTested] is null, null, [Equipment])
Meaning if the numbertested field is null the equipment field will be blank, if it is not just leave what is in the equipment field there, but it returns a #Error in the printout. It seems to handle the two null records correctly. Trying Equipment.Value also returned the same error.
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Mar 13, 2014
Payroll main form to post attendance record. Before I open the attendance form, I wanted to check if there is a record in the sql statement.
The code below produces error MS Acces object "Variable or With Block Variable Not Set"
Code:
Private Sub cmdPostAtt_Click()
Dim stSQL As String
Dim dbHBK As DAO.Database
[Code].....
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Jul 5, 2013
My issue is that I am trying to update a date field. When I do the date field may have a date or may be a null. When I try to pass in a NULL date with no quotes, I get a syntax error. When I have single quotes in the statement and a null value is passed in, I get an invalid use of date.
Dim DENIEDDATE1 As Date
If (Not IsDate(rs.Fields("DENIED_DATE"))) Then
DENIEDDATE1 = Null
Else
DENIEDDATE1 = "'" & rs.Fields("DENIED_DATE") & "'"
End If
update table1 set table1.denieddate = " & denieddate1 & " 'get Update syntax error with this statement
update table1 set table1.denieddate = '" & denieddate1 & "' 'fails due to invalid use of null
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Jun 19, 2014
I have a form with a check box. A query is run that looks at that check box and decides what the criteria are based on that. So, if the check box is checked, it should pull in all data in the field that is a Y. If it is not checked, i want it to pull all data (Y's and N's and blanks).
here is my criteria:
IIf([Forms]![frm_Query_Form]![CheckBox]<>0,"Y","*")
This does not seem to work. I have also tried:
IIf([Forms]![frm_Query_Form]![CheckBox]<>0,"Y")
IIf([Forms]![frm_Query_Form]![CheckBox]<>0,"Y",Like "*")
IIf([Forms]![frm_Query_Form]![CheckBox]<>0,"Y","like "*"")
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Mar 26, 2015
basically am creating a booking system, i have a add a room form. my form should check whether i already have a room number in my table, which works when the form is filled in. however when my form is null, then i press add new room button, i get this error rather than " please fill your form in"
Error: runtime error '3075' syntax error (missing operator) in query expression 'Room Number ='.
room number is a number field, integer but has primary key. i cant keep autonumber, as my requirement is to add new room number, but the roomnumber has to be unique.
here is the dlookup;
If DLookup("RoomNumber", "tblRooms", "RoomNumber = " & Forms!RoomPackages!txtRoomNumber) > 0 Then
MsgBox "This number already exists."
Else
p.s it unbound form
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Mar 19, 2007
Long time lurker, first time poster.
I'm in need a of a check-in/check-out application for my company. We have about 550-600 employees at any given time and our turnover is about 20-30% per year. Our check-in/check-out process requires our employees to personally visit between 30-40 areas in our company (personnel, safety, credentials, parking, insurance, etc) within the first month of employment. This is currently done manually and is a huge drain on labor, especially when check-in sheets are lost, misplaced or, in some cases, forged.
I'm looking to build a database that would be intranet based, password secure (by check-in area) that would allow the new employee to present at a particular check-in, check-out site, complete that portion of the check-in/out process and then allow the person responsible for the check-in/out to enter the status into the database. At any point in the process, I would want to know the status of the person checking in/out (how long they've been checking in/out and what portion of the process have they completed).
Can this be done in ACCESS?
Thanks
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