On 1/10/08, Eric Butera <eric.butera@xxxxxxxxx> wrote: > > On Jan 10, 2008 2:28 PM, David Giragosian <dgiragosian@xxxxxxxxx> wrote: > > > > On 1/10/08, Eric Butera <eric.butera@xxxxxxxxx> wrote: > > > > > > On Jan 10, 2008 2:02 PM, Philip Thompson <philthathril@xxxxxxxxx> > wrote: > > > > On Jan 10, 2008, at 12:48 PM, Eric Butera wrote: > > > > > > > > > On Jan 10, 2008 1:33 PM, <reese@xxxxxxxxxxxxxxxx> wrote: > > > > >> I have been using define to create a constant for the link > resource > > > > >> returned by mysql > > > > >> pconnect like so: > > > > >> > > > > >> $PL = @mysql_pconnect("localhost", $DBUser, $DBPass); > > > > >> define("SITE_DB",$PL); > > > > >> > > > > >> > > > > >> Later I use the constant to select my databases. > > > > >> > > > > >> mysql_select_db($SrcdbID ,SITE_DB); > > > > >> > > > > >> This code seems to be working as I expected and I have many > > > > >> thousands of llines of code > > > > >> done over several years using this construct. > > > > >> > > > > >> But, I happened to be reading the php doco today and noticed that > > > > >> you are not supposed to > > > > >> use define for resources, so question is, is what I am doing safe > > > > >> or am I going to run into > > > > >> problems and if so what is the best way to globally pass > resources > > > > >> to multiple classes and > > > > >> functions, command line scripts etc? > > > > >> > > > > >> > > > > >> Cheers > > > > >> Charlie Reese > > > > >> > > > > >> > > > > > Hi Charlie! > > > > > > > > > > Well a CONSTANT is a value that doesn't change. I don't think > that > > > > > makes sense for a DB connection. The connection command returns a > > > > > resource that could be different on each request depending on if > > > > > you've worked on different resources. > > > > > > > > > > You could just do this: > > > > > $GLOBALS['SITE_DB'] = @mysql_pconnect("localhost", $DBUser, > $DBPass); > > > > > > > > > > Then inside your function reference it like this: > > > > > mysql_query($sql, $GLOBALS['SITE_DB']); > > > > > > > > > > This would be an easy mass find/replace that you could do. Global > > > > > variables are evil though. > > > > > > > > > > I personally use the registry pattern to hold an instance of the > > > > > database connection that can be lazy loaded whenever I need > it. Then > > > > > inside of my gateway objects I pass that instance in the > constructor > > > > > so they only have to know how to work with its interface. If > you're > > > > > okay with using object that might be a nice road to travel. You > could > > > > > also use the singleton pattern but I would advise against that > because > > > > > what if you wanted 2 instances for different databases? I've > never > > > > > ran across this myself but you never know. Plus it makes unit > testing > > > > > a little tricky since you can't mock it as easily. > > > > > > > > > > Hopefully something in all this will help you to an answer. > > > > > > > > > > > > I don't agree that "Global variables are evil." If you have a valid > > > > purpose for defining a global variable, then go with it. The usual > > > > argument is that it could accidentally be changed elsewhere (and > there > > > > are several more). However, defining a variable that you KNOW you're > > > > going to use only for a database connection, IMO, is perfectly fine. > > > > > > > > $GLOBALS['SITE_DB'] = @mysql_pconnect("localhost", $DBUser, > $DBPass); > > > > > > > > If you accidently change $GLOBALS['SITE_DB'] elsewhere, then I think > > > > you have some bigger issues at hand. =P HTH. > > > > > > > > ~Philip > > > > > > > > "Personally, most of my web applications do not have to factor 13.7 > > > > billion years of space drift in to the calculations, so PHP's rand > > > > function has been great for me..." ~S. Johnson > > > > > > > > -- > > > > > > > > PHP General Mailing List (http://www.php.net/) > > > > To unsubscribe, visit: http://www.php.net/unsub.php > > > > > > > > > > > > > > Depending on what project I'm working on sometimes I use specific > > > globals on our older procedural code because: > > > > > > 1) It is our code > > > 2) It does not use outside code > > > 3) I'm the only developer working on it > > > 4) It is very simplistic > > > > > > By specific globals I mean that I have a "namespaced" entry such as > > > $GLOBALS['ericonly']['db'] and put things inside of ericonly. I > > > basically only use this for database connections and a few other very > > > specific things. > > > > > > Aside from that I'm not going to argue the merits of globals. Someone > > > else can do that as I've made up my mind and so have you. :) > > > > > > But just to prove that I'm right > > > > http://www.google.com/search?hl=en&q=global+variables+are+evil&btnG=Search > > > :D > > > > > > Well... > > > > Personalized Results *1* - *10* of about *121,000* for > > *global< > http://www.google.com/url?sa=X&oi=dict&ei=InGGR9TUIYO6gATv4ZHKBg&sig2=rv83RnqqLJDobfnA3d78Lg&q=http://www.answers.com/global%26r%3D67&usg=AFQjCNF3eQaMYwTOPeOFmY3o3_vKZoxD3g > > > > variables< > http://www.google.com/url?sa=X&oi=dict&ei=InGGR9TUIYO6gATv4ZHKBg&sig2=PtlnDj6B_ES74-UoJFdoYg&q=http://www.answers.com/variables%26r%3D67&usg=AFQjCNHUllfcxecDiCBZ124r8p5KyQoZlQ > >are > > evil< > http://www.google.com/url?sa=X&oi=dict&ei=InGGR9TUIYO6gATv4ZHKBg&sig2=QHGtFJrSLNf_0ARuYMWpHA&q=http://www.answers.com/evil%26r%3D67&usg=AFQjCNF5_Fag6ntgqNkFzuWVU9bEyb717Q > > > > *. (*0.10* seconds) > > > > Personalized Results *1* - *10* of about *4,330,000* for > > *global< > http://www.google.com/url?sa=X&oi=dict&ei=83CGR832BpbAggSao-G9Bg&sig2=b4uu-ZcrCZM0QWEXalxTNA&q=http://www.answers.com/global%26r%3D67&usg=AFQjCNH3VaZGgornyBLBavFsd_hljiBXsA > > > > variables< > http://www.google.com/url?sa=X&oi=dict&ei=83CGR832BpbAggSao-G9Bg&sig2=kto8MuCLr5saX5VPjN8ThQ&q=http://www.answers.com/variables%26r%3D67&usg=AFQjCNF1uZkzAKhsWmdBCI0IzFzgLSEAhA > >are > > good< > http://www.google.com/url?sa=X&oi=dict&ei=83CGR832BpbAggSao-G9Bg&sig2=ntLt-I0PIDJMXBMCk4OXCg&q=http://www.answers.com/good%26r%3D67&usg=AFQjCNHkthOJTyoPGlW9T2kzBpRwIqBc_A > > > > *. (*0.25* seconds) > > > > Sorry, I couldn't resist. ;-) > > > > David > > > > Nice try, but if you don't put your query in quotes "global variabels > are evil" then it is just finding searches that contain the words such > as the first result: > > Global Variables Are Bad > A good example of a global variable is LoginId? (or NetworkId?) > whereby the app is making a lot of security or role-based calls and > must pass this all over ... > c2.com/cgi/wiki?GlobalVariablesAreBad - 24k - > While "global variables are good" in quotes did not return any results from Google, "global variables are evil" in quotes only returned a result set of 4: Results *1* - *4* of *4* for *"global<http://www.google.com/url?sa=X&oi=dict&ei=-nyGR539MKjIgQT1hKC7Bg&sig2=Gorx1ErPpjplcNDVa0qb6g&q=http://www.answers.com/global%26r%3D67&usg=AFQjCNFszs4YfNg7ok3-m08IgyrhO5EAsQ> variable<http://www.google.com/url?sa=X&oi=dict&ei=-nyGR539MKjIgQT1hKC7Bg&sig2=vCOY79teeScIcrxuvb6k3g&q=http://www.answers.com/variable%26r%3D67&usg=AFQjCNEzQBZwfNnJ4pr1pnYOXYttJJNkvg>are evil<http://www.google.com/url?sa=X&oi=dict&ei=-nyGR539MKjIgQT1hKC7Bg&sig2=eh8-cXxXIwGuHRJhXG2REQ&q=http://www.answers.com/evil%26r%3D67&usg=AFQjCNHcgNJwcVKoYcSB_Ks5OMr4LnAXWw> "* ** Hardly an overwhelming argument by using search results as a measure. David