Modules & VBA :: When To Use Global Variable

Apr 8, 2014

I have an application where several different procedures are run repeatedly every xx seconds to get live updates from a server (different procedures depending which form the user currently has open.) Within each procedure, a separate single procedure is called only if a stored boolean setting is set as true. The setting itself is only changed very infrequently, such as on application startup, but needs to be initially set (i.e. it cannot just have a default of False if it is not set.)Because of this I am storing the setting in a single record table and have a function 'UsingWPilot' to return the boolean value. However, given the frequency that the setting needs to be accessed, and the fact that speed is crucial in the running of the app, I am considering adding a global string variable and modifying the function to look at the variable (possible values 'N' and 'Y') and only going to the table if the variable has not been set.

I have heard various things about how you should never if possible use global variables. My question is: is it faster to use a global variable than to open the table record each time?

option 1 :

Code:

Public Function UsingWPilot() As Boolean
Dim db As DAO.Database
Dim rs As DAO.Recordset
Set db = CurrentDb
Set rs = db.OpenRecordset("rbl_Settings_System")

Option 2:

Code:

Public Function UsingWPilot() As Boolean

Dim db As DAO.Database
Dim rs As DAO.Recordset
If Len(g_WPilot) > 0 Then
UsingWPilot = (g_WPilot = "Y")
Else
Set db = CurrentDb
Set rs = db.OpenRecordset("tbl_Settings_System")

[code]....

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Modules & VBA :: How To See Value From Form As Global Variable

Apr 16, 2015

I want to use several values entered in form controls as variables within multiple subs triggered by further form edits. I do not want to define the variables in each sub as this will bloat my code, but I am not being successful in declaring my variables outside of an individual sub, and it is the 'Form!' reference that is throwing it I think.

Here are my variables:

Code:
Dim limit0txt, limit1txt, limit2txt, limit3txt As Integer
limit0txt = Forms!F_Samples_CF_FF_FLot!SF_EnviroCountLimitscntrl.Form!Limit0
limit1txt = Forms!F_Samples_CF_FF_FLot!SF_EnviroCountLimitscntrl.Form!Limit1
limit2txt = Forms!F_Samples_CF_FF_FLot!SF_EnviroCountLimitscntrl.Form!Limit2
limit3txt = Forms!F_Samples_CF_FF_FLot!SF_EnviroCountLimitscntrl.Form!Limit3

If I put these at the top of a module I get an "invalid outside procedure" error message. If I put these in their own module as 'Public' I get the same error. how within a forms code module I can make these variables available to as many events as I like?

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Sep 23, 2005

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I want to be able to carry the primary key entered on form 1 to form 2 and form 3, so that the user does not have to type it 3 times. How can i accomplish this ? Can i call the last primary key entered on table 1 and automatically pop it up on form 2 & 3 every time form 2 & 3 load?
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May 18, 2005

I am trying to use a global variable in a dlookup but get an error when i try and run the form

Here is the code:

VUserID is my Global Variable.

Private Sub Form_Open(Cancel As Integer)

Dim UsersName As String

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End Sub

Any Ideas

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Oct 2, 2006

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If i do a DLookup when the form opens and have the text box value = the result it works fine ie

Private Sub Form_Open(Cancel As Integer)
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End Sub

Where MyUserID is the global variable.

if i put
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in the control source of Text2 i get #Name? as a result and if i input
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i get the correct result.

As a test i tried to have the control source = my global variable, of another text box control source with the same result.

It looks like i can only reference my global variable within the VB and not in the forms control sources. Is this correct or can you referece the Global variable in the control source.

Shot

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Dec 15, 2004

i am having trouble with my where clause.. ca someone take a peek please..

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SELECT tblCheckReq.UserName, tblUsers.UserDept, tblCheckReq.PaymentMethod, tblCheckReq.PaymentDueDate, TRIM(tblCheckReq.Company & " " & tblCheckReq.TaxType & " " & tblCheckReq.PaymentType) AS DISTDETAIL, tblCheckReq.TaxYear, tblStateTaxDepts.To, tblStateTaxDepts.Street, Trim(tblStateTaxDepts.City & ", " & tblStateTaxDepts.State & " " & tblStateTaxDepts.Zip) AS FULLADDR, tblCheckReqAmtsToAccts.GLAccountNo, tblCheckReqAmtsToAccts.Amount, tblCheckReq.ID, tblCheckReq.Approvedby, tblUsers.SalaryCode, tblCheckReq.Date, tblStateTaxDepts.Dept, tblStateTaxDepts.To, tblCheckReq.TaxYear, tblUsers_1.SalaryCode, tblCheckReq.Company, tblCheckReq.TaxType, tblCheckReq.PaymentType
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Aug 9, 2005

Hello,

I have the following query that I set up as a test, and it runs fine:

SELECT STATUSHISTORIE.*
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WHERE (((STATUSHISTORIE.STATUSDATUM)<#1/1/2005#) AND ((PROBLEM_DE.DATENBEREICH)='SPMO') AND (((Left(([PROBLEM_DE].[MODULZUORDNUNG]),InStr([PROBLEM_DE].[MODULZUORDNUNG],"-")-2)))='K29') AND ((PROBLEM_DE.ERLSTAND)<>"WEIF"))
ORDER BY STATUSHISTORIE.PROBLEM_ID,
STATUSHISTORIE.STATUSDATUM;

I then set up two global variables ( a String and a Date) and respective functions to return them – ReturnE( ) and ReturnKW( ). Now my query looks like this, but takes ages to run:

SELECT STATUSHISTORIE.*
FROM STATUSHISTORIE LEFT JOIN PROBLEM_DE ON [STATUSHISTORIE].[PROBLEM_ID]=[ PROBLEM_DE].[PROBLEMNR]
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My two public functions that return the global variables look like this:

Public gstrE As String 'global variable: contains E used for query
Public gdatKW As Date

Public Function ReturnE ()
ReturnE = gstrE
End Function

Public Function ReturnKW ()
ReturnKW = gdatKW
End Function


The tables are actually Views set up from an ODBC Data source. Can anyone please tell me why these global variables are causing the traffic jam? :)

Thanks in advance
J

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Mar 15, 2006

Hi All,

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Cheers

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I have this declaration in a module called Global Code
Option Compare Database
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Below is the SELECT code of the data source of the report.
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Note: I chose to save the current customer's ID in a global variable because, for some reason, when I select the report the Customer form loses the current customer record and goes to the end of the table as if creating a new customer record. This would not be an issue as long as I can retrieve the value in a variable.

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[Code] ....

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Code:
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'GTSdata
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[Code] ....

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Nov 6, 2013

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Code:

Private Sub Command15_Click()
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[code]....

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Code:
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Code:
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