libdatabase : connection problem

[Alex Tweedly]

Dan Shafer wrote:

> Off-hand I spotted a couple of potential problem spots (haven't spent  
> a lot of time analyzing whether these are the only problems):
>
> On Aug 28, 2005, at 2:46 AM, Revolution wrote:
>
>> Sunday, August 28, 2005 12:45:34 PM (GMT +02:00)
>>
>> event from button :
>>
>>   local tDbA = ""
>>   local i = 0
>>   local tDataA = ""
>
> The above lines are doing nothing for you because they are incorrect  
> syntax for Revolution. The expression "i = 0" evaluates to either  
> true or valse but does nothing with the result. IF what you intend to  
> do here is to initialize local variables, then you need the slightly  
> more verbose:
>
Sorry, Dan, but the above *is* correct syntax, and does do what you'd 
expect.

 From the docs:

> Declares one or more local variables and assigns initial values to them.
>
> local variablesList
>
> local currentStatus -- creates one local variable
> local thisThing,thatThing,theOtherThing -- creates three variables
> local A=1,B=2,C=3 -- creates variables with initial values
>
and

> Description
> Use the local command to define a local variable for a handler, or to 
> define a script local variable that is shared between all the handlers 
> in a script.
>
> Parameters:
> The variablesList consists of one or more name=value pairs, separated 
> by commas:
>     * The name is any string.
>     * The value is any literal string.
> The value is optional; you can specify just the variable name. In this 
> case, the specified local variables contain empty when created.
>
[end of docs quotation]

Dan said:

> Having said that, it is strictly optional in Transcript to use the  
> word "local" and I'd venture to say that the vast majority of us  
> never use it. Variables are local unless they're explicitly defined  
> to be global. In that case, you eliminate the three "local" lines in  
> the above and just assign the initialization values to the variables  
> with the same effect.
>
I use it often - mostly because my typing is bad and I often mistype 
variable names - therefore I always use explicitVariables to help detect 
my typos - and therefore need to use "local", but also I use it to 
initialize locals as above. (And you can use the initialization form to 
assign values to script-local variables too).

-- 
Alex Tweedly       http://www.tweedly.net



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