OK, I am not a database programmer. Working in games for the last 8 years I have have rarely touched a database. Anyway, my wife has a research project that requires a simple database Access with a few tables. Two of those tables have a relationship. What my wife wants is for a new record or tuple, you know what I mean to be automatically added to one of those tables when a record is added to the other table.
All fields except for the primary key shared by both tables would of course be set to null. She expected that defining a relationship would automatically achieve this but it doesnt work that way.
Is a simple macro or VBA script the way to go here? Do macros in access only work when a form is used to enter data? Or can they be made to work when using the table view or importing data from a csv file? I do not believe Jet the database engine Access uses supports table-level triggers, so you'll need to use a macro or VBA code in a form to trigger the extra record.
Access doesn't have triggers like T-SQL, but it also sounds like you might not have the experience to write one anyway. In Access' table view, you can't run code by typing in a cell, or run macros, or do anything except type. Macros are run when they are run, they aren't tied to any specific object. If you're importing data from a csv file, and you're doing it in a vba function, you could write any code you want to add it to a table.
I'm not sure if you've already imported the csv data, or how you're doing it. If you have some programming experience you can write a vba function to read each line of the. Defining the relationship in Access is for forcing referential integrity but can't be used like a t-sql trigger. For example, if a record is required in one table before a key is added to another table it will give you an error if the condition isn't met.
If the records are to be added one at a time, you could write an Access form and then on the form's After Insert procedure add the other record to the other table. In this way, the After Insert procedure works like a trigger as long as you use the form. Thank you, table level triggers are what I was looking for without knowing it.
Pity that Access doesnt support them. I can stop looking for a way to do that now. Gecko, what you say about the relationship is as I thought: that it is used for integrity checking not automatic data insertion.Keep in touch and stay productive with Teams and Officeeven when you're working remotely. You use update queries in Access databases to add, change, or delete the information in an existing record.
You can think of update queries as a powerful form of the Find and Replace dialog box. You cannot use an update query to add new records to a database, or to delete records from a database. To add new records to a database you use an append query, and to delete whole records from a database you use a delete query. Using an update query. Update data from one table to another. Stop Disabled Mode from blocking a query. Here are the similarities and differences between Find and Replace and an update query:.
Like the Find and Replace dialog box, an update query lets you specify which value is being replaced, and what the new value is. Unlike the Find and Replace dialog box, an update query lets you:.
An update query cannot be used to update data in the following types of fields:. They only exist in your computer's temporary memory after Access calculates them.
Because calculated fields do not have a permanent storage location, you cannot update them. Some of the values represent a single record, and others represent more than one record. The update operation is not possible because it is not possible to determine what records were excluded as duplicates, and therefore not possible to update all the necessary records.
This restriction applies whether you use an update query or try to update data manually by entering values in a form or a datasheet. Because some duplicate records are removed from the results, Access cannot update all the necessary records. Top of Page. As a best practice when creating an update query, first create a select query that identifies the records that you want to update, and then convert that query to an update query that you can run to update the records.
You cannot undo the results of an update query, and making a backup helps make sure that you can reverse your changes if you change your mind. How to back up your database. Click the File Tab, and then click Save As.
Do Linked Tables in Access 2010 update automatically just by opening the database ?
On the right, under Advancedclick Back Up Database. In the Save Backup As dialog box, specify a name and location for the backup copy, and then click Save.
To revert to a backup, close and rename the original file so that the backup copy can use the name of the original version. Assign the name of the original version to the backup copy, and then open the renamed backup copy in Access. Step 1: Create a select query to identify the records to update. Step 2: Update the records. On the Create tab, in the Queries group, click Query Design.
Select the table or tables that contain the records that you want to update, click Addand then click Close. The table or tables appear as one or more windows in the query designer, and the windows list all the fields in each table. This figure shows the query designer with a typical table. Double-click the fields that you want to update in the table windows.
The selected fields appear in the Field row in the query design grid. This figure shows the query design grid with all the fields added. To limit the query results based on field values, in the query design grid, in the Criteria row, enter the criteria that you want to use to limit the results.
I have the main access database located on a stand alone PC off the network and i have a access database with linked tables on the network linked back to the stand alone PC. I have linked the tables by creating a network share to the stand alone PC and linking them though a path. Can i set it up so that when the database is opened it automatically updates the linked tables. You can. I often find it convenient to use a small check form that runs on start-up set through start-up options and checks a variety of things, including linked tables.
To this end, I also hold a table of linked tables on the local machine, although a list of linked tables can be obtained by iterating through the TableDefs collection, I think it is slightly safer to keep a list. The check form can check all links and if a link is broken or missing, either ask the user for a new location or use a fixed location. If no problems are found, the form can close itself and open a menu or other form.
Learn more. Asked 9 years, 4 months ago. Active 5 years, 2 months ago. Viewed 5k times. AstroCB Where is you front-end and where is your back-end.
Anyway if you have linked tables, they are updated when you update them. What is the point? Have you Googled "update access linked tables"? If not, why not? This is one of the most common Access questions in existence and has been answered a bazillion times in a million forms a thousand different ways.
Active Oldest Votes. In the case of linking to a linked table, it is possible to get the connection to use from: CurrentDB.For more information, contact patwood gainingaccess. In this article we will show you how you can call a single procedure using just a little code to automatically relink your back-end tables, even when the database files have been moved to a different folder.
The procedure will also relink the tables in multiple back-ends. Automating the relinking of tables just makes good sense. This is especially true if you are distributing your database to others. It can save you a lot of headaches, trouble, travel, and time. You do not have to be physically present, nor do you need to remotely access another computer.
Additionally, you do not have to enter the names of your back end database s or your linked tables. The code gets important information from the TableDefs collection in your front-end.
This includes the names of your linked tables and the names of your back-end databases. The code then uses this information along with the existing path of the front-end database to get the string needed to set the TableDef Connect Property.VBA Access Linked Tables - Entire Directory
Fulfilling this requirement allows the files to be moved to any folder, or a different computer, and the code will automatically relink the tables. To be more precise, the code must be run before a bound form loads data from the tables. So you could use other procedures in unbound forms, such as a Splash form, before calling the RefreshTableLinks procedure.
Dim db As DAO. For Each tdf In db. TableDefs tdf. End Function. The above procedure only returns a message string if an error has occurred. This allows you to quietly record the successful relinking of tables in the Immediate Window instead of using an annoying MsgBox that pops up every time you open the database.
However, you can use the MsgBox if need to notify the user when one or more of the tables fails to be relinked or there is an error. Dim strMsg As String.
Do linked tables update automatically?
It is a good idea to let the procedure run each time the database is opened. You can put the RefreshTableLinks Function in a Standard Module, add the code to call the procedure, and you are all done.
You can forget about it — at least until there is a failure to relink a table. Barring corruption of a database, this should be a rare case; that is unless someone decides to move one of the files to a different folder or rename the back-end database.
This code will only connect to Access Database tables that have already been linked in the front-end database.
Microsoft Access – How to update linked tables
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Students Click Here. I'm trying to set up an automated procedure that runs a Crystal report against an Access database. I need the linked tables to refresh when Access opens the database.
Is there a script, macro, or command line option I can use to do this? I'm not sure what you mean by "refresh". I thought the data was stored in the MDB and needed to be refresed by updating them using the linked table manager.Want to reply to this thread or ask your own question?
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I will do a report using the linked tables as well. If a user enters new records or modifies existing records in the other database, will these changes be automatically visible when I run the query or report in the database that I linked the tables to?
In reality, a linked table is really a connection string to the data in the actual database table. If the table is linked, all data changes are relected in the real table.
What cannot be saved, however, are table design changes. John Vinson. Thanks to you both for the replies.Keep in touch and stay productive with Teams and Officeeven when you're working remotely. Learn how to collaborate with Office Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services.
You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number. I was told that just by opening the database the linked table is automatically updated, but I suspect this is not true.
I believe it is actually necessary to open the Linked Table Manager and "Select the linked tables to be updated:" and then click OK. Please confirm if this is correct, i. Did this solve your problem? Yes No. Sorry this didn't help. Of course I did test this theory, and my test showed that a query against the linked table, and extracted results - - based on the premise that the linked table updates automatically simply by opening the database - - was not the same as the results of the query AFTER manually updating the linked table using the linked table manager.
That said, I am also hoping maybe some SME or Access guru might confirm my suspicions and answer my question with authority as I would prefer not to rely on just my test but to obtain validation by an expert.
I made a change to some data in my linked file, saved and closed it My initial test was based on queries run on different days this week; Tuesday and then today Thu. The data definitely changed today vs. The latest test today and your input Duane seems to confirm that it's not necessary to refresh a linked table and that it does in fact refresh automatically.
April 14, Keep in touch and stay productive with Teams and Officeeven when you're working remotely. Site Feedback. Tell us about your experience with our site. SteveSchwantes Created on August 2, I'm using Access and I have a table linked to an Excel file stored on the company network. I believe it is actually necessary to open the Linked Table Manager and "Select the linked tables to be updated:" and then click OK Please confirm if this is correct, i.
Steve S. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread. I have the same question This would be so easy to test. Thanks for marking this as the answer. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site. How satisfied are you with this response?