Solved

Display a messagebox based on results of a query - MS Access

Posted on 2016-09-20
2
82 Views
Last Modified: 2016-09-21
I have an Access database with a form to add records using a command button.  There are a number of textboxes on the form that require the user to enter data into.  One of the textboxes is used for entering a date.

I have a small table with a list of invalid dates.   When the user clicks the command button to attempt to add a record, I want the date value entered in the textbox to be checked against the table to see if the date entered is valid.  If the date exists in the table, it is an invalid date.

The basic query for that is as follows:

SELECT Count(*) AS Expr1
FROM MyDatesTable
WHERE (((MyDatesTable[invalid_date])=Forms![Form1]![txt_Date]));

When the above query is run, it returns a value of 1 (invalid date because the date selected exists in the table) or 0 (a valid date).

What I need is, rather than have a 1 or 0 returned, I want a messagebox to pop up indicating "invalid date selected" when the query result is 1 and no action when the value is 0.  So, I'm looking to have the query results that get returned to be replaced by a messagebox (for invalid dates) or nothing (when the user entered a valid date).

Right now, under the command button to add a record, I have the following to get the basic query to run:

DoCmd.OpenQuery "Valid_Date_query"

How do I modify it or what do I replace it with to get the action I'm looking for?  Thank you.
0
Comment
Question by:dbfromnewjersey
2 Comments
 
LVL 49

Accepted Solution

by:
Gustav Brock earned 500 total points
ID: 41807549
You can use:

If CBool(DCount("*", "MyDatesTable", "[invalid_date] = #" & Format(Forms![Form1]![txt_Date].Value, "yyyy\/mm\/dd") & "#")) Then
     MsgBox "Date in use."
End If

Open in new window

/gustav
0
 

Author Comment

by:dbfromnewjersey
ID: 41807629
Perfect. Thank you very much.
0

Featured Post

The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Overview: This article:       (a) explains one principle method to cross-reference invoice items in Quickbooks®       (b) explores the reasons one might need to cross-reference invoice items       (c) provides a sample process for creating a M…
Describes a method of obtaining an object variable to an already running instance of Microsoft Access so that it can be controlled via automation.
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Learn how to number pages in an Access report over each group. Activate two pass printing by referencing the pages property: Add code to the Page Footers OnFormat event to capture the pages as there occur for each group. Use the pages property to …

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question