Relationships: Can't Lock A Table...

Sep 17, 2006

I am trying to define a relationship between tables. The relationship is one-to-many with forcing referential integrity. When I try to define it, I get the dabaase engine error:

"The database engine couldn't lock the table, because it is already in use by another person or process"

I am sure that the database is not opened by anyone else, it is 100% local, no other instance of Access is running, and there was no *.ldb file... What can be the problem?

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I have a DB with multiple import processes to take in information and populate various tables. This has been in place for some time and works with no issue.

The import process involves the creation of a local staging table, to which I import the received data, normalise it according to my own table structure, remove any duplication (i.e. same data imported repeatedly) and append the cleansed data to the main tables.

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However, since I added this extra step, I am getting the following error message during my import process :

Error 3211 : The database engine could not lock table 'tblStaging' because it is already in use by another person or process

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But I can't replicate the error while debugging so it seems to be a run-time issue. It's definitely not another user as the staging table is deliberately local (specific to that user's front-end)

I suspect I can probably solve the problem by adding some kind of DoEvents call or brief pause somewhere but the problem is, I don't know where the problem is occuring, so I don't know where to add the line? Or if that would even solve the problem at all?

Is there an easy function I can call to check if the staging table is locked? Which I could then use to debug and identify exactly where the lock is causing a problem? Or even apply the DoEvents to release the lock? (It must eventually get released as if I step through the code, I don't get the error?)

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In the main form there is a button which opens a report with a historical record of dates of value changes of each product up to a chosen date. This chosen date is determined by inputting a date into a text box.

This report also sources (tbl_companies, tbl_deals, tbl_products, tbl_vl).

When I try to open the report, I get the run-time error "3211".

'The database engine could not lock the table "Tbl_companies" because its already in use by another person or process.'

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I have setup a number of tables for a booking system. The tables are as follow:

tblCustomers
tblBookings
tblRegularCustomers
tblRegularBookings

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The fields in each are as follow:

tblBookings:
Booking ID
Customer ID (linked to tblCustomers)
Date for Booking *
Time Period *
Weddings/Birthdays (yes/no)
Extension (yes/no)
Cost

tblRegularBookings
Regular Booking ID
RegCust ID
Date For *
Time Period *
Extension
Cost


What should i link to allow me to not create a normal booking on the same date as a regular?

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Here are my relationships for my 5 tables I created. My database is something that a turn key automotive performance shop would use. Tell me if my relationships are correct and what I need to do. I think I got a good start but I am not sure on a few things. Also what do I need to do for my validation and look up tables. Any help on that would be great. Thanks.


http://www.mustangmods.com/data/1030/relationships.jpg

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This is a simple video library database, 1 member can have many loans, 1 video can have many loans and 1 loan can have many videos, so with that in mind woud anyone be able to make my relationships right? because at the moment you cant take out more than one video on each loan?

thanks in advance

http://www.the22nd.com/forum/uploads/post-12-1107976078.jpg

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Apr 1, 2005

I have restructed my original tables into 3NF and added relationships. But I think I am missing a few more items to go on to next step. Help me, please! I am putting together an automated Time Card Entry Database based on a timesheet and other reports already existed in Excel.
I have the following fields on this form as follows:
1. Week Ending: automatically populates with "mm/dd/yyyy" date format from tblPayrollSchedule. This field will insert the correct pay period with comparing against today's date.
2. Employee Number: combo box that will populate next fields (1. Employee Last Name; 2. Employee First Name) after user select correct Employee Number.
3. Employee Last Name: automatically populates when Employee Number is selected.
4. Employee First Name: automatically populates when Employee Number is selected.
5. Acct Id: combo box containing a list of labor description that has associated fields as follows.
6. Description: Text Box will populate after selecting Acct Id.
7. Cost Center: Text Box will populate after selecting Acct Id.
8. Acct: Text Box will populate after selecting Acct Id.
9. Category: Text Box will populate after selecting Acct Id.
10 Pay Type Id: combo box that will populate Pay Type.
10. Pay Type: automatically populates when Pay Type Id is selected.
11. Allocation: Free form, to type comments.
12. Days of Week: Sat, Sun, Mon, Tue, Wed, Thu, Fri
13. Total Wk Hrs: total hours for the week for per line of Acct Id.

Here are my tables:
1. tblEmployees:
1) pkeyEmployeeId = AutoNumber
2) strLastName = Text
3) intStaffNumber = Number
4) fkeyEmployeeTypeId = Number

2. tblEmployeeType:
1) pkeyEmployeeTypeId = AutoNumber
2) strEmployeeClass = Text
3) strEmployeeType = Text

3. tblAccounts:
1) pkeyAcctId = AutoNumber
2) intCostCenter = Number
3) intAcctNo = Number
4) intCategory = Text
5) strAcctName = Text
6) strAcctDescription = Text

3. tblPayType:
1) pkeyPayTypeId = AutoNumber
2) strPayType = Text
3) strDescription = Text

4. tblPayroll Schedule:
1) pkeyPayrollScheduleId = AutoNumber
2) intPayPeriodId = Number
3) dtmPayStartDate = Date/Time
4) dtmPayEndDate = Date/Time
5) dtmCheckDate = Date/Time

5. tblTimecard:
1) pkeyTimecardId = AutoNumber
2) intStaffNumber = Number
3) fkeyPayPeriodId = Number

6. tblTimecardHours:
1) pkeyTimecardDetailId = AutoNumber
2) fkeyTimecardId = Number
3) fkeyAcctId = Number
4) fkeyPayTypeId = Number
5) strAllocation = Text
6) intSat = Number
7) intSun = Number
8) intMon = Number
9) intTue = Number
10) intWed = Number
11) intThu = Number
12) intFri = Number

Here is the layout of my form in this order:
1. Pay Period Id
2. Week Ending
3. Employee Number
4. Employee Last Name
5. Employee First Name
6. Acct Id
7. Description
8. Cost Center
9. Acct
10. Category
11. Pay Type Id
12. Pay Type
13. Allocation
14. SAT
15. SUN
16. MON
17. TUE
18. WED
19. THU
20. FRI
18. Wk Hrs

Question 1: Please review table relationships to see if I overlooked any tables that can be broken down or named its column differently?

Question 2: I have restructured these tables into 3NF, please see my previous posts under AccessRookie (although before 3/2005, someone used this ID).

Question 3: what code do I need to automatically populate "Week Ending" field with the correct "CheckDate" that will compare against today's date and insert into "Week Ending" field? Currently, user selects from Combo Box(Pay Period Id) then it populates Text Box(Week Ending).

Question 4: how come "tblTimecardHours.fkeyTimecardId" field is not populating? I think it is my table relationship: tblTimecard & tblTimecardHours.

Question 5: what code do I need for "Wk Hrs" on subfrmTimeEntry, this column needs to sum these columns: SAT, SUN, MON, TUE, WED, THU, FRI).
No need to store total since it is only need to display in data entry form (subform) and printing report.

I need your assistance since sometimes, it just takes another pair of eyes to review another peers' work. It's been ages since I've done any development from scratch. Help!!! Is there any way, I can attach my zipped database? It is 217KB zipped but this site only allow 100KB attachments.
Sincerely,
AccessRookie =)

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I Have These Tables:
Case, Agents, Forwarders, Orders.
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1 Agent Many Forwarders
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