• Topcat Aircraft Database Update Statement Example
• Topcat Aircraft Database Update Statement Template

I'm just starting out to learn all about sql databases. For now based on previous suggestions that was given to me online, I've incorporated a using statement to avoid problems in sql connection and then I applied parameterized queries to avoid sql injection. I was also been given an advice to use sqlparameter arrays to supplement the parameterized queries that i implemented. I just want to know if there are other techniques that you would recommend to improve my code, which i will indicate below. Feel free to suggest better solutions.

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Topcat Aircraft Database Update Statement Example

1 Answer

Stacking the using statements

I am particularly difficult to please with code that has nesting, and I highly prefer to stack the usings when it is possible.

versus

Exception Handling

You should include exception handling into your code, as it will likely throw an exception sooner or later (such as getting disconnected, network issues, etc.)

Using Lists not Arrays

It would likely do you more harm than good to be using an array, especially in the context of maintainable code. I would recommend you switch to using Lists, like this:

This will let you introduce more items into your parameters without having to do deal with the headaches of explicitly indexing.

Note: If you want to keep the same method signature for yourGetExample()method, then don't forget to pass the parameters as an array --- you could useToArray()to accomplish that.

Here it all is together...

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Topcat Aircraft Database Update Statement Template

When you update, you work with two SAS data sets. The data setthat contains the original information is the master data set. The data set that contains the new information is the transactiondata set. Many applications, such as maintaining mailing listsand inventories, call for periodic updates of information.

In a DATA step, the UPDATE statement reads observationsfrom the transaction data set and updates corresponding observations (observationswith the same value of all BY variables) from the master data set. All nonmissingvalues for variables in the transaction data set replace the correspondingvalues that are read from the master data set. SAS writes the modified observationsto the data set that you name in the DATA statement without modifying eitherthe master or the transaction data set.

The general form of the UPDATE statement is

where

is the SAS data set containing informationyou want to update.

is the SAS data set containing informationwith which you want to update the master data set.

is the list of BY variables by which youidentify corresponding observations.

If the master data set contains an observation thatdoes not correspond to an observation in the transaction data set, the DATAstep writes that observation to the new data set without modification. Anobservation from the transaction data set that does not correspond to anyobservation in the master data set becomes the basis for a new observation.The new observation may be modified by other observations from the transactiondata set before it is written to the new data set.