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Detecting database changes


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Do you need to determine if a user has changed any of the fields of a displayed record, but hasn't yet posted the record?
If so, you can check the current state of the database via the datasource associated with it. To do so, simply write the following code:

if (Datasource1.State in dsEditModes) then
  {...code you want to execute...}

If the datasource's State property is dsEdit, dsInsert or dsSetKey, this statement will evaluate as true.
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We're looking at it for a few thnigs: first as a 'cache' database in front of the production databases as emergency failover (even a cluster can crash, so we have a very limited set of features we support). It is an internet based application so saying 'go away we're down' isn't an option. We'll pull some amount of data into an XE database hourly and on failure point the app servers to it. We'll have about 5% functionality, but it is important functionality to 90% of the clients. Having lost the RAC a few times, this is a nice emergency solution.Second place is to remove the mySql/SQLServer/Postges/Access ... databases the business units have created over the years. With ODBC/JDBC and PHP/Perl interfaces, we don't change the applications, just the database underneath them.Then we can leverage the production DBA and engineering resources to help manage them until we can replace each one into a RAC. (Funny how the business units want our help in managing and tuning until we try to take them into our control.) [url=[/url] [link= http://yzaslkoxhe.c..xhe[/link]
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