TV Guide Database
Apr 7, 2006
I am trying to write a query showing me all tv shows on right now.
The design of the tables are unchangeable because they are given to me.
The 2 important fields in the Schedule table are:
time (which is a date/time value, for when the program starts ex: 2/3/05 8:30AM)
durations (a number giving the program lenght in minutes ex: 60 (1 hour)
I want to write a query showing me what is on right now, then problem is I do not want to use MSAccess functions like DatePart or Cint ect... because the SQL from this query will be used through on a webpage using a jscript activex ADO connection and I dont think Functions like DatePart() are supported.
Thanks
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Oct 23, 2006
Hi,
I have created a simple database named: tblcustomer.mdb with fields of Company, Address and Tel
I would like to create another database which records the jobs that I have done for these companies. I name it tbljobrecord.mdb with fields of Company, job 1 and job 2
My question is, how can I link the Company field (tblcustomer) with the Company field of (tbljobrecord) so that everytime I add in a new Company (tblcustomer), it will be updated on the tbljobrecord too.
Thanks.
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Sep 12, 2006
I'm new to Access and have been learning how to use it for the better part of a year. I've done all the Microsoft online tutorials relevant to the work I need to do with it, and gotten a few books out of the library besides. In general, I self-teach very well given a good resource.
Here's my problem: the main area in which I need to be proficient is running queries, and I cannot find a good, comprehensive explanation of how to construct expressions or set up calculated fields.
In case I'm not clear (I've had quite a time just figuring out what to call what I need), I'll give you an example. I was able to arrange a short tutorial with someone in another department. As part of a query, she used the following statement in the "Field" section to convert date information stored as mm/dd/yyyy into just the year:
Year: IIf([referraldate]<#1/1/2003#,"2002",IIf([referraldate] Between #12/31/2002# And #1/1/2004#,"2003",IIf([referraldate] Between #12/31/2003# And #1/1/2005#,"2004",IIf([referraldate] Between #12/31/2004# And #1/1/2006#,"2005",IIf([referraldate] Between #12/31/2005# And #1/1/2007#,"2006")))))
This is the kind of thing I want to learn how to do. Unfortunately, the Microsoft tutorials don't do much more that give examples of different expressions and functions; I feel like I've been given a handful of sample sentences, a few nouns, and a few verbs--and then told to go speak English.
What I need is a comprehensive guide that not only gives me the building blocks of expressions, but tells me how to combine them into a syntactically meaningful statement--so I know what order things go in, where commas and parentheses should be, etc. Both online or print materials are fine--I've been looking on my own, but with no luck.
Thanks for your help!
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Nov 20, 2007
Having had little luck in getting any concrete information about effective ways to manage ODBC data, and after days of long trials and errors, I thought at least I could write up a summary of what I've found to work well for ODBC sources and hopefully others may be able to contribute to this.Disclaimer: This is a far cry from being an authoritative and is woefully very subjective, being written by me and myself, using a MySQL server and Access 2003. I do hope that others who are able, can contribute more information to make this somehow more useful for those who would like to use Access as a front-end client.There are three principal issues that must be considered when you are using a ODBC data sources:1. Numbers of connections and different flavor of connections.2. Size of recordsets and network traffic.3. Binding forms to ODBC data sources.As a starting point, one should read the whitepaper on Jet and ODBC Connectivity. (http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnaraccessdev/html/ODC_JetDatabaseEngineVersion30ODBCConnectivity.asp ) This was for Jet 3.0, but should be valid for 4.0 as well. ODBC Driver and ConnectionsThe next thing is to understand what your ODBC driver is capable of. In a connection string, there is a parameter for "Options", which is usually a long integer. You should look at the ODBC driver's manual to ensure you have all options you need turned on. A good example would be to ensure that a certain data type is correctly mapped to Access's data type. In my case, I ensured that Big Integer (64-bit) were turned off because Access does not support this (and thankfully, I don't need it anyway). By far most important thing you want to look for is to ensure that the driver supports two things- Multiple statements and Active statements. Jet does try to pool all queries to the server into one connection whenever possible, but if the driver cannot support multiple statements over single connection, Jet will open another connection to submit a statement. Therefore, if you have a form that has a combobox, Jet will send two queries, one for form's recordsource and another for combobox's rowsource. In case of lack of support for multiple statement, Jet will need two connections. Even if your driver supports multiple statements, Jet may find it necessary to open a second connection if the driver cannot have more than one active statement. Active statement is when you fetch a big recordset and need to wait a bit for the full set to come over the wire. So back to that form with a combobox, if Jet find that the form's recordsource will take a while to be fetched, it will go ahead and open second connection to populate the combobox in order to allow for 'instantaneous' loading of a form from a user's POV.Wherever possible, keep numbers of connection to a minimum. As mentioned before, Jet will try to pool all statements into one connection wherever possible, but Jet cannot help you out if you issue a query using a new ADO connection, DAO ODBCDirect workspace, or create a recordset within VBA. If you want to avoid the additional overhead of another connection, you should use a stored query instead, and make sure it has a Connection string in its query property window set, so Jet knows that it uses ODBC data and pools it with its open connection to the ODBC server. The stored query can then be called within VBA without incurring another connection.DSN and DSN-less/ODBC and OLE DB connectionsThere are two ways to create connections, by using Data Source Name (DSN) or direct connection. To find right connection string, look at Carl Prothman's excellent website listing all possible connection strings (http://www.carlprothman.net/Default.aspx?tabid=81). Some people say connecting to DSN is better than without. Others say it's faster without DSN. One thing for sure is if you use DSN, you will need to distribute the DSN file to your users along with the finished database. I would recommend experimenting with both connection flavors before deciding which is better suited for your needs.To make a DSN connection DSN-less, look at Doug J Steele's example (http://www.accessmvp.com/DJSteele/DSNLessLinks.html) or perhaps this Add-in by Paul Litwin (http://www.mvps.org/access/modules/mdl0064.htm).Also, make sure you know whether you have different drivers available. I know for an example, some people prefer third-party drivers for Oracle over one supplied by Oracle themselves. Furthermore, some drivers are OLE DB which is supposedly better than ODBC (I say supposedly only because I am skeptical of Microsoft's promises of new and latest technology superseding a older technology, then dropping their claims and going back to older technology). Binding formsTo Jet's credit, it is quite intelligent in retrieving just enough rows to populate the bound form, and will continue to fill up the recordset periodically while a user is working on a row. However, Jet has some quirks where it can do something very stupid, such as asking for multiple full table scans. If you bind a form to ODBC table, Jet will do a full table scan. The simplest solution would be to add a WHERE clause to make the recordset smaller. But by far the better solution would be to set the recordsource's connection string to use ODBC instead of "(current database)". Jet will then query for keys, which it must have locally in order to manage a recordset, then afterward query a few rows at a time. If you can manage to keep keys smaller, all the better.Furthermore, if you want to use subform, do not use Master/Child linking fields. This makes Jet go ape-shit, issuing several queries to show tables and index which is quite unnecessary. Rather, leave the link blank, and set subform's recordsource with a WHERE clause to match the parent form's key, so Jet will only ask for rows that match the key only without asking for indexes and table status every time you move around.An additional benefit of making all queries for forms' recordsource an ODBC query is that you now have more control over how you handle those forms *with* Jet's intelligence. For example, you now can start transaction across multiple forms with subforms and commiting/rollbacking as you see fit, which would have not been possible using Access itself. I have been able to rollback the changes in two parent records and their related child records by issuing a SQL Pass-through query which simply says "Rollback;" and nothing was changed for any one of records, just as expected. If you have a combobox or listbox on a form, this will mean another query in order to fill in the rowsource. Ideally, you want to keep some tables local to front-end clients, especially for tables that will never change (e.g. a list of states or provinces for example). For tables that may be updated peridocially but is otherwise select-only, you need to decide whether you want to make it a dynaset or a snapshot. For a small set, snapshot is faster, but for a larger set, dynaset is faster. You will need to experiment with the rowsoource to ensure that the network traffic and time to load the rowsource is satisfactory. One problem is that Access won't accept an variable (at least I have been unable to do so) for a stored query's connection string, so if you need to change a connection string (e.g. you want to use different set of options, perhaps?), you would need to do this by hand, or at least write a function to loop through queries and updating the connection strings. Haven't tried that yet, but would imagine this is very possible.Keep an eye on SQL log when developingYou definitely will want to have the server write a log of what queries it has received from Jet to give you feedback in ensuring that Jet doesn't do anything stupid. This has told me far much more about Jet than working within Access environment. Unresolved issuesThere is only one thing I haven't yet worked on- Sharing a recordset for different controls. Suppose we have a form with a combobox and a subform, both which use same table as a rowsource and recordsource, respectively. In this case, Jet will issue two separate query to the server, even if they may use same recordset. If anyone has been able to show how to get such controls to share recordset, that would be cool.Also, I'm a bit worried about scattering connection strings all over the place, especially that it will contain a password. As I see no point in asking users to authenicate themselves every time they use a query with a ODBC connection string, given that variables can't be used in query's connection string. Would MDE make this less of a problem (I do not know if password still can be plucked out from a hex editor?). A possible solution is to synchronize Access's security with the server's security, because Jet will try to use Access's user & password for initial connection, and if a call to retrieve password was made along with a module at startup to 'fix connections' along with updating the connection string with the entered password, this may help somehow with keeping the password secret? Does anyone have more information on that?External LinkA useful FAQ (http://archives.postgresql.org/pgsql-interfaces/2000-07/msg00193.php) for linking Access with Postgresql which may be useful in giving you some ideas of how you can work with Access. If anyone wants to contribute to this, please do feel free to do so. If anyone finds anything that is dead-on wrong, please give me a good can of whoop-ass- I hate to lead blind into ditch, so to speak. :)
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Sep 7, 2011
I'm trying to set up a simple query that links four tables. However, the tables are extremely large, all in excess of 1.5GB each so I had to split the tables up into four separate DBs. I've tried the following with no success:
1) Link the 4 tables in the DB which contains my primary key. This quickly inflates increases the file size above 2GB and won't let me go any further.
2) Build a remote query to connect the four tables. This looked promising until I tried to run the query and it became evident that it only knows to point to the last database source that you specified.
I'm running everything locally on my C drive. The data source are simple text files (1.6 million rows) from the FDA website.
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Oct 7, 2005
Hello All...
Well, I am facing one problem..in my application; I need to show all forms / reports name of other database( .mdb ) file without opening the other database physically. I tried a lot but didnt succeded. I tried with below code..
Set AcApl = New Access.Application
Call AcApl.OpenCurrentDatabase(strfolder, True)
Set AcProj = AcApl.CurrentProject
Set frm1 = AcProj.AllForms
intCount = frm1.Count
But here wen the second line AcApl.opencurrentdatabase get executed at that time the database get open physically, and i dont want that..So is there any other way around..If so..please please help me..
Thanks in advance..!!
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Aug 22, 2014
i have a database that runs updates from within itself.what i need is, this database to then open a another database run a update query, then close it.
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Sep 12, 2012
Database: Access 2007
I have designed a touchscreen input system using Visual Basic.net and this writes to an Access Database. Each Touchscreen has its database locally so it can still work even if there are Network problems.
Now what I would like to do is have all these local databases write to a central database say every minute but only write new records to the central database. The Central Database can either be Access or SQL.
What is the best way to do this?
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Jun 24, 2015
I have been working on a database for over a month now, and my boss just threw a monkey wrench in my work. I believed that the Metal Market Prices would be entered once a week in the current DB. My boss informs me today that he wants an employee to go in every morning and enter that days Price for Each Metal with respect to many different markets.
There is a total of 12 metals, and 5 markets. I need the data to be stored first by date, then by either market or metal, and lastly by which ever isn't used second (Either: date-market-metal, or date-metal-market). I think the Latter of the two methods makes the most sense. Is it possible for my current DB to lookup values from the Metals Database based on date-metal-market?
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Jul 7, 2005
I have a problem that seems to be happening on several users' databases and is causing a big problem. None of the databases is a shared database...they are all single-user databases on stand-alone computers. I have tried looking for help within previous posts, but all seem to be related to shared databases.
I am getting an error message: "The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time." The database cannot be opened, imported, repaired...nothing seems to work.
Again...these are NOT shared databases. I appreciate any help I can get. I created the database for all of the secretaries in our school district to keep up with absence data. It involves many tables, queries, forms and reports, and has generally worked well. However I am now seeing several that are getting similar errors as mentioned.
Thanks!
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Dec 25, 2005
I'm new to Access and VBA, for the record. What I need to do is copy a SQL database (table structures and records) and save it as a local Access database, so that the user can query and make any changes on the local file without editting the SQL database.
Looking around, it seems like the best option would be to use the TransferDatabase method with the acImport option. Does this sound reasonable, or can someone with more experience suggest a better way to go about it? Thanks.
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Aug 28, 2013
I am testing the security of my DB X on Acccess 2007. I could create a new database Y and linked to the database X. Unfortunately i could change the records on the tables. I don't want other DB that make connections to my DB to change my tables!
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Aug 29, 2005
Is it possible to access a table in one Database (Database A) from a separate Database (Database B) and if so how. I should clarify that this is an Access Database.
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Oct 24, 2013
I created a database with forms, querys, etc. Now I was thinking of creating a exe so everyone can use this database without having access to all the design functions.
the only problem I see about doing this is if we need to use the same database for different project, we need to always create a new exe for each project.
Is there a way to make a empty database exe with just the layout, querys etc but with no data on the tables and have a save, open and save as option. So we can have several projects using the same database?
I was thinking to create a VB code for the database to delete all data on the tables when the database is open.
and before closing the database exporting all the data to a txt file or something.
Then the next time someone opens the database goes to the main form which has a open bottom which imports the txt file into the tables.
This way we can have several txt file for several project and use always the same exe database.
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Nov 20, 2006
I am working on a database that will be an addition to an existing one on the company server. However, to make the overall layout not so complex and allow room for other additions in the future, I'd like to keep the databases separate. This will also ensure more efficiency, integrity and troubleshooting overall.
Does anyone know how this is done?
Thank you in advance for your help,
~Kilch :eek:
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Oct 2, 2007
The menu for make a MDE file is blanked out or grey’d out. The database is partly made using access 2000 then xp
Jabez
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Dec 21, 2013
I have a series of unrelated access databases and I would like to have one 'super menu' where i can click a button to go to different databases.
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May 24, 2005
I have a car dealership database and have a servicing section.
I want to create a form to service these vehicles.
The only vehicles which will be displayed on the from are the sold ones (because you cannot service a vehcile which hasnt been sold) which i have a query for.
I also want the form to display the customer who owns the car the service details (eg what they need), the parts availiable and the parts required for the service.
The calculations i need to make in this form are as follows
quantity needed (parts required table) - quantity in stock (purchasing customer parts table)
quantity needed (parts required table) * price (Parts Table) + labour (servicing table) = part/labour costs (servicing table)
http://pic18.picturetrail.com/VOL885/3178839/6480291/97832270.jpg
any suggestions on how to do this would be fantastic
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Jan 4, 2006
i havent been able to figure out how to get my subform to work properly....
i've posted in the forms section (http://www.access-programmers.co.uk/forums/showthread.php?t=99624 )
it is really important that i figure this out so that i can keep my job..
how else can i obtain help? even if i have to pay for it?
what do you guys suggest?
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Feb 13, 2006
Hi all,
I was playing with passwords for one of my access db.
I tried opening the db with the password, but it won't work. So, I thought I forgot the password. I checked some posts on this forum that helped in retrieving the password and it's the same that I have been trying. I am not sure if the Name is correct, is there a way to retrieve the log on name?
I also noticed that when I try opening any other db on my system, it asks me to log on, I though I was only applying a password to one file.
Please help
Thanks!
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Apr 3, 2006
Hello Here is my question I have a datbase with 4 tables
I have one of the table related to the other 3 by agent name.
I Have a page with the agents and all thier info. NO problem
I want to create a link from each agent to thier listings..
Do I need to have a seprate page for each agent or can one page
create the info I need with that agent..??
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Apr 15, 2006
I have been tasked with setting up a database for all employees the info contained is along the following lines:
Employee Number:
Name:
Qualification Status:
Qualification Run Out Date:
To name but a few of the parameters
I have currently set up the start up screen, main switch board and the complete employee records table with form (for simple viewing/input).
My problem is this we have four departments that require access to the database
Admin - Require access to all employee records (View)
1 Dept - Require access to their employees (View and update records)
2 Dept - Require access to their employees (View and update records)
3 Dept - Require access to their employees (View and update records)
Currently i have created one complete employee record table (Admin) how do i break this down for each department so that when the info within each one is updated it in turn updates the main Admin table?
I started by copying and renaming the Admin table for each department but this never updated.
Any help and info would be appreciated.
On a slightly less important note for the time being at least can i password protect each command button on the main switchboard?
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May 16, 2006
Hello,
I basically started teaching myself how to use Access 2000 about a week ago. I am working on a project for work, that requires to have a report of all the training records. But my boss wants it to be color coded. He wants one color to show the people's training classes that are 45 days out from being over due, he wants another color to show what classes are due. And another color that shows classes that are over due. In my table, I have a column for the classes that show the date that they took the class, and I have another column that shows the due date of the class. But I have no idea how to go about getting the report color coded with what he wants. Any help at all would be great. Many thanks in advance.
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Jun 28, 2006
I am being asked to modify a old program for a new similar function.
In the blue heading bar above the tool bars there is a name (ECB License) for the database. I need to modify this name to the new name (wheat license).
Thanks for your help. GG
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Aug 2, 2006
I have be requested to find or create something that will track and reports meals served at the camp.
They require breakfast,lunch,dinner and midnight meals recorded for each section and for the day.
I have look for an access db or and excel spreadsheet samples but not able to find anything.
Maybe someone here is already doing this or knows where I can finded something like this.
Thanks for everyones help.
:)
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Nov 6, 2006
Hi,
I'm designing a database but it is turning into a bit of a state. :(
I Understand that my approach is probably poor but i am fairly new to Access. and realln need some advice/help
All other programs i have written have used inputs from list and combo boxes to wirte to a table. This is the first that reqires me to manipulate data already stored in a fixed sized datasheet.
I have two tables: tblMainProgressList and tblLog
The database is used to check the status of different 'line numbers' in a construction project. like a time line; when all boxes have been ticked, the project is complete!
the different Status's have been named STN1,STN2,STN3.. etc (Station1,2,3..) This will enable the program to be migrated to a different project by simply changing it's name instead of digging deep into and changing lots of code.
So far, when i click any STN tickbox, the reletive STNDate will be assigned with the current date. and likewise removed if the STN is unticked. (all from the Afterupdate event of the subform)
I have managed this with a large bunch of udate querys in SQL. However, this is just a prototype; the final design will have nearly 30 different stations! This means a huge amount of update querys that will probably make the operation of the program very slow.
surely there's a better method to handle this? :( (i'm all ears :D )
In a similar way, each time a STN is ticked, a reletive field (STN1Val, STN2Val...etc) is given a load value (percentage of project completion). A TOTAL field adds all STNVals to produce the total percentage complete.
Now, This all works (although the coding will probably be laughed at).
but my next taks is to send the data to a log each time it is updated:
So- for example . if STN1 is ticked on line-20000
i would like the last record in tblLog to store the data:
| Line No | Name | Date/Time | Total Load |
| line-20000 | PIDNoRev | 06.11.06 12.00 | XX |
where name is the name of the station that was ticked.
I really need some advice on how to single out the STN that i was ticked last, and write it to the name field in tblLog . If this is solved i could work out the rest.
Also any help on my update query issue will be greatly appreciated..
I have attached the database to make all this a bit clearer (hopefully)
Many thanks, Jamie
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