I would locate the problematic tables and outsource them into a decent DBMS and rewrite the affected parts using 2 concurrent connections to get some peace for the first time. Then I'd not touch it for the next decade.
Good points. Was the first procedure for a general library I ever wrote in Delphi 7. And every database is set up and then connected to dbiSaveIt (my procedure's name in GProcs7, which gets added along with GDefs and GBDE) to every project). It's autonomic at this point to create the table (I ALWAYS use woll2woll's InfoPower controls for this stuff and have for most of this century) and immediately go to AfterPost and type in dbi Ctrl-Space which expands to dbiSaveIt(dataset.handle);
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Appreciate your extensive inquiry. As for the preponderance of issues on Mondays and Fridays, I have looked into usage patterns. The main app, some 2M lines of code worth, is NOT the only program accessing the data. There are 15 other apps, SOME written in Delphi XE7 with the 32 bit personality, the rest in Delphi 7. I tried to spot the possibility of an XE7 app being used on the target days. No such pattern from the 39 users who use the product during the days and the 9 that use it at night. The programs will refuse to exit if still in dsEditMode. Now, I can't prevent exiting via Task Manager, but that's a step I don't believe any users were using as an out. And I do have EurekaLog running on all the apps. Looking at the errors, they mainly pertain to two: Index is out of Date and Blob has been Modified errors. The latter is almost always, I believe, a conflict between two users making changes to the same record and having both produce an audit change to add to the top of the History memo field. The former?? no idea, other than possibly cached updates via Windows not keeping with the BDE changes, which I write to disk IMMEDIATELY on posting via the AfterPost routines. Now, there are TWO other smaller percentage issues. Windows updates somehow affect the Win.INI file that is a remnant leftover that BDE REQUIRES to know which idapi.cfg file to use (we use the centrally located one on the server). So, we get an error about initializing the BDE. Users know to run BDEadmin and 're-load' the central CFG file. Noisome, but somewhat predictable. The other issue is an error on exiting by some users some of the time citing a Variant or safe array is locked. THIS error is attributable to library that I used to create the records for the auditing. The third party library has a flaw in it cleaning up after itself. It's STILL there because the program that some of the users use was frozen in time after a crash made the source code to change it inaccessible. (actually multiple failures due to natural disaster ... but again, that's excuse making). In their daily use, there are certain sequences that trigger use of the library and it's predictable that that one or two sequences will mean the user MUST stay long enough for that error to appear on shutdown, so that they can exit out of the error message. This lets the program exit finally. BUT, the user in question, has to make a bus that leaves right around our shift end. Sometime, she doesn't stay long enough. And the backup that night fails because she is STILL in the program, occupying BDE. Syncback just ignores files in use. Sigh. Now, I've looked and the last time we ran into the variant error and backup failure was in November of last year. The time before that was in June. Three times in all last year. Not really a contributor to the REGULAR WEEKLY ISSUES, but not nothing either.
Do I write software to academic AND real world best standards. No. Not even close. I'm not elegant. I just plug away to get the end result. Might not be the fastest. in fact might isn't even close. It's NOT the fastest. I'm a nibbler. A tester of a small change and once that works, next change up. It's not the fastest developmental strategy. I use direct manipulation of table data with table objects (mostly woll2woll stuff) And remember, I'm working with a RELATIONAL database, not a database server product. Heck, Delphi 7 doesn't even have a decent implementation of SQL built in. I designed against normalization rules I gleaned from reading back in the 80's. Did I understand the full form set? Nope. But I was aware of every byte of memory each record took and I used normalization rules as they made sense to me. It made MORE sense to me to have a small database of extra data than to create a field in the main database for something less than 1 percent utility. And I didn't want to have the overhead of that waste byte or two. These self-directed rules have never changed, even if worrying about a byte in a database design has become silly.
The first thing you need to do is to create a new application in Delphi. On the main form of the application, drop the following components: Two (2) TTable Components Two (2) TDatasource Components One (1) TDBGrid One (1) TDBLookupComboBox (You can drop this anywhere, we'll be positioning it at runtime) To make things easier, set both TTables' DatabaseName properties to "DBDEMOS." Point the first table (Table1) to ORDERS.DB, and the second table (Table2) to CUSTOMER.DB (this will be our lookup table). Point DataSource1 to Table1 and DataSource2 to Table2. In plain english, you're setting DataSource1 and Table1 to point to the data entry table, while DataSource2 and Table2 point to the lookup data table. From there it's a matter of setting DBGrid1 to point to DataSource1.
Most controls from the AlphaControls package may have support of Unicode (in Delphi6-2007, Delphi 2009 and newer has an automatic support of unicode). In this case used the TntControls package (thanks TNT authors, TntControls must be installed already). For using this feature should be uncommented the TNTUNICODE key in the sDefs.inc file (should be {$DEFINE TNTUNICODE}) and AlphaControls package must be reinstalled (sources needed).Note: don't forget backup all projects before opening after package installation, some Unicode data may be lost if compiled without TNTUNICODE key. be457b7860
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