DBPRO Data Principles - Data Types, Sizes, Optimization and Operations

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Chris Tate

DBPro Master

16

Years of Service

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Joined: 29th Aug 2008

Location: London, England

Posted: 12th Sep 2011 15:29 Edited at: 13th Sep 2011 12:40

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Here is a guide which demonstrates how to use and optimize data to be saved to disk or be sent over a network. Find out the size of data types, how to store more than one property in the smallest datatype available and how to use binary expressions. The article features a data size knowledge test.

Visit page one of the guide

Disclaimer: If you know DBPRO like the back of your hand, and you work for Microsoft during the weekdays and you can produce a fully working Super Mario level 7 minutes, and you can spot 4 problems with this code snippet without compiling it

+ Code Snippet

#constant Eaten = 0
#constant ManySausages = 4
#constant PoisonSausageFromMars = 22
#constant PoisonSausageDamage = 23.0

dim Sausages(5)
Sausages(0) = 1
Sausages(1) = 1
Sausages(2) = 1
Sausages(3) = 1
Sausages(4) = 1
Sausages(5) = PoisonSausageFromMars

print "Initial sausages on plate "; array count( Sausages ) 

Eat( 0 )
Eat( 1 )
Eat( 2 )
Eat( 3 )
Eat( 4 )
Eat( 5 )

array insert at bottom Sausages()
Sausages(0) = 1

print "Sausages left "; array count( Sausages ) 

if array count( Sausages ) > TooManySausages
    print "Stop eating so much; Please wait while the system downloads a diet program"
endif

wait key

function Eat( sausageId )
    if Sausages( sausageId ) = PoisonSausageFromMars
        print "Deal "; PoisonSausageDamage; " sausage damage to player"
    endif
    list delete element Sausages( sausageId )
    inc Eaten
    
endfunction

then leave this page now as the article may bore you to death, Chris is not to be held responsible for any damages caused.

If you have just installed DBPRO and you have not written more than 1000 lines of code in your life, and you think that a string and cord are both datatypes, and you think that declaring a 3D boat as a float will make it travel on water, and this is your first time here, then, welcome anyway.

Providing you have knowledge of how to use datatypes such as strings and floating point numbers, proceed with the article. If not, then it is recommended for you to look up the principles section of the shipped documentation; accessible by pressing F1 in your code editor. What you read in this article today may cause a panic attack, but tommorow it will make a little more sense. Be sure to add the article to your favourites if you wish to learn this stuff later.

+ Code Snippet

(I lied about there only being 4 problems in the snippet above...)

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Grog Grueslayer

Valued Member

19

Years of Service

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Joined: 30th May 2005

Playing: Green Hell

Posted: 12th Sep 2011 17:35 Edited at: 12th Sep 2011 17:56

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Quote: "(I lied about there only being 4 problems in the snippet above...)"

I see four problems.

1. No END after WAIT KEY (otherwise it'll error out when it hits the function)

2. "list delete element" should be "ARRAY DELETE ELEMENT"... unless "list delete element" is a command in a plugin I don't have. But technically it should be remed off because of Eat(0) to Eat(5) function calls... as elements are deleted the number will eventually go beyond the array size and thus causing an error.

3. "Sausages(0) = 1" should be "Sausages() = 1" so it's added to the end of the array rather than redefine the first element in the array.

4. Each time the ARRAY COUNT() command is called "Sausages" needs to have () added to it so ARRAY COUNT() detects the actual count of the array rather than showing -1 like it's an empty array. "ARRAY COUNT(Sausages)" changed to "ARRAY COUNT(Sausages())"

You're just lieing about lieing.

Edit: I do love your charts by the way. I'm going to grab your data chart as an image and use that as a reference instead of the one in the Darkbasic help files.

I just wish booleans were true booleans in Darkbasic rather than acting like bytes with a 0 to 255 limit.