• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 81
  • Last Modified:

is it possible to create a function in access and use it in a query?

Hello guys

I'd like to know if it is possible to create a function in access and use it in my query.

if so, could you give me an example? Or a link where I can study this.

thanks
0
hidrau
Asked:
hidrau
4 Solutions
 
Eric ShermanAccountant/DeveloperCommented:
Yes, it's pretty straightforward.  Just create a Public Function in a Module and use it in your query passing any of the fields as parameters you have defined.

I you give a little more specifics ... we can help you more precisely.

ET
1
 
Eric ShermanAccountant/DeveloperCommented:
This is a good simple example here on EE that Expert DatabaseMX provided.  This function is called in a query to split a string in one field into separate City, State and Zip fields.

https://www.experts-exchange.com/questions/28972160/How-to-split-a-string-in-a-Microsoft-Access-Database.html#a41814429

ET
1
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
Anders Ebro (Microsoft MVP)Microsoft DeveloperCommented:
You are not the first one to ask that question. I actually saw so many questions about this topic that I decided to make a video about it couple of years ago. You can see the video here:
How to use a custom Function in MS Access
1
 
DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform)Commented:
+1
0
 
Helen FeddemaCommented:
I frequently use the GetProperty function in queries -- here is some showing how to create and use custom database properties:

Option Compare Database
Option Explicit

Private dbs As DAO.Database
Private prp As DAO.Property
Private prps As DAO.Properties


Public Sub SetProperty(strName As String, lngType As Long, _
   varValue As Variant)
'Created by Helen Feddema 2-Oct-2006
'Modified by Helen Feddema 11-Oct-2014
'Called from various procedures

On Error GoTo ErrorHandler

   'Attempt to set the specified property
   Set prps = CurrentDb.Properties
   prps(strName) = varValue

ErrorHandlerExit:
   Exit Sub

ErrorHandler:
    If Err.Number = 3270 Then
      'The property was not found; create it
      Set prp = CurrentDb.CreateProperty(Name:=strName, _
         Type:=lngType, Value:=varValue)
      CurrentDb.Properties.Append prp
      Resume Next
   Else
   MsgBox "Error No: " & Err.Number _
      & " in SetProperty procedure; " _
      & "Description: " & Err.Description
      Resume ErrorHandlerExit
   End If

End Sub

Public Function GetProperty(strName As String, strDefault As String) _
   As Variant
'Created by Helen Feddema 2-Oct-2006
'Modified by Helen Feddema 11-Oct-2014
'Called from various procedures

On Error GoTo ErrorHandler
   
   'Attempt to get the value of the specified property
   GetProperty = CurrentDb.Properties(strName).Value

ErrorHandlerExit:
   Exit Function

ErrorHandler:
   If Err.Number = 3270 Then
      'The property was not found; use default value
      GetProperty = strDefault
      Resume Next
   Else
      MsgBox "Error No: " & Err.Number _
         & " in GetProperty procedure; " _
         & "Description: " & Err.Description
      Resume ErrorHandlerExit
   End If

End Function

Public Function ListCustomProps()
'Created by Helen Feddema 3-Oct-2006
'Modified by Helen Feddema 3-Oct-2006
'Lists DB properties created in code (as well as built-in properties)

On Error Resume Next
   
   Set dbs = CurrentDb
   Debug.Print "Database properties:"
   
   For Each prp In dbs.Properties
      Debug.Print vbTab & prp.Name & ": " & prp.Value
   Next prp

End Function

==================================
Usage examples:

Private dbs As DAO.Database
Private prp As DAO.Property
Private prps As DAO.Properties
Private lngDataType As Long
Private strPropertyName As String
Private strPropertyValue as String
Private varPropertyValue As Variant

Date
====
   If IsDate(Me![txtStartDate].Value) = False Then
      strTitle = "Invalid date"
      strPrompt = "Please enter a valid start date"
      Me![txtStartDate].SetFocus
      MsgBox prompt:=strPrompt, _
         buttons:=vbExclamation + vbOKOnly, _
         Title:=strTitle
      GoTo ErrorHandlerExit
   Else
      dteStart = CDate(Me![txtStartDate].Value)
   End If
   
   strPropertyName = "PropName"
   lngDataType = dbDate
   Call SetProperty(strPropertyName, lngDataType, dteStart)

   GetStartDate = CDate(GetProperty("PropName", ""))

Text
====
   strPropertyName = "PropName"
   strPropertyValue = CStr(cbo.Value)
   lngDataType = dbText
   Call SetProperty(strPropertyName, lngDataType, _
      strPropertyValue )

   strDocsPath = GetProperty("PropName", "")

Long
====
   strPropertyName = "PropName"
   lngDataType = dbLong
   Call SetProperty(strPropertyName, lngDataType, lngID)

   lngID = CLng(GetProperty("PropName", ""))

Integer
=======
   strPropertyName = "PropName"
   lngDataType = dbInteger
   Call SetProperty(strPropertyName, lngDataType, intMonth)

   intID = CInt(GetProperty("PropName", ""))

Boolean
=======
   strPropertyName = "PropName"
   lngDataType = dbBoolean
   Call SetProperty(strPropertyName, lngDataType, "True")

   blnValue = CBln(GetProperty("PropName", ""))


Saving to a custom property from a control's AfterUpdate event
==============================================================
Private Sub txtDate_AfterUpdate()
'Created by Helen Feddema 2-Sep-2009
'Last modified 2-Sep-2009

On Error GoTo ErrorHandler
   
   If IsDate(Me![txtDate].Value) = True Then
      dteSingle = CDate(Me![txtDate].Value)
      strPropertyName = "SingleDate"
      Call SetProperty(strName:=strPropertyName, _
         lngType:=dbDate, varValue:=dteSingle)
   End If
   
ErrorHandlerExit:
   Exit Sub

ErrorHandler:
   MsgBox "Error No: " & Err.Number & "; Description: " & _
      Err.Description
   Resume ErrorHandlerExit

End Sub

Open in new window

1
 
hidrauAuthor Commented:
Thanks a lot for your help
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now