One of the better ways I've found to handle transactions using CF is like
this:
<cflock name="AddOrder" timeout="10">
<cfset commit = true>
<cftransaction action="begin">
<cftry>
<cfquery>
blah blah
</cfquery>
<cfquery>
blah blah
</cfquery>
<cfcatch type="any">
<cfset commit = false>
<cftransaction action="rollback" />
<cflocation addtoken="false" url="errorpage.cfm">
</cfcatch>
</cftry>
<cfif commit>
<cftransaction action="commit" />
<cflocation addtoken="false" url="success.cfm">
</cfif>
</cftransaction>
</cflock>
The transaction is only added to the db if every query or function is
successful. This prevents multiple transaction sessions from interfering
with each other and disallows partial inserts/updates/etc (like in a
shopping cart solution) from being entered in to the db.
Hope this helps.
Chris
On 7/26/07, Christopher Jordan <[EMAIL PROTECTED]> wrote:
Kevin,
I'm not an authority, but here's what I think I know:
INNODB tables are slower *because* they allow for transactions.
Transactional databases (tables?) allow you to roll back changes that were
made to it. So it keeps track of all changes that have been made and store
them so that you can roll back a particular insert or update or what have
you as if that statement had not taken place. I have no idea how far back it
keeps information of this sort, I just know that on other DBs I've worked
with (older versions of DB2) this means that extra disk space is required to
store all the changes.
The only senario that *I'm* aware of (I'm sure there are loads more) would
be when doing something like this:
<cftransaction>
<cfquery name="update" datasource="blahblah">
UPDATE InventoryTable
SET ItemQuantity = ItemQuantity - 1 -- I think you can do this in
sql... if not just consider it psuedo code ;o)
WHERE ItemID = #MyItemID#
</cfquery>
<!--- customers automattically get entered for a prize drawing or
something --->
<cfquery name="insert" datasource="blahblah">
INSERT INTO PrizeDrawingTable (CustomerID, ItemID)
VALUES (#MyCustomerID#, #MyItemID#)
</cfquery>
</cftransaction>
In this case if the first query fails for some reason, then the second
query wouldn't execute. If the first query was successful but the second
query failed, then the first query would be 'Undone' or rolled back.
This may be an overly simplistic view, and since I don't do this sort of
thing often, I may have even gotten something wrong. Someone please correct
me if I did get something wrong.
Does that help?
Cheers,
Chris
On 7/26/07, Kevin <[EMAIL PROTECTED]> wrote:
> Anyone have experience with MySQL? I have been using it for years now
> but I wonder if I might have outgrown it.
>
>
>
> The way that I understand it is that my MyISAM tables are faster but
> INNODB allow for transaction support (which I have never fully understood).
>
>
>
>
> We have been using MyISAM for years and have been satisfied. However, I
> am told that in order to make a backup of the database you have to shut it
> down, back it up, then restart it. This is absurd. Therefore, we were
> considering moving to INNODB but everything I read says that these are *
> VERY* slow tables.
>
>
>
> Please let me know if you have any advise….should we move away from
> MySQL? Is there a solution to back up MyISAM? Is the performance of
> INNODB really not as bad as I have read.
>
>
>
> I am so confused and frustrated……I understand that MySQL is used by some
> pretty big hitters (http://www.mysql.com/customers/). What are these
> guys using?
>
>
>
>
>
>
>
> Any help, advise, comments, etc. will be tremendously appreciated.
>
>
>
>
>
> --------------------------------------------------------
>
>
>
> Kevin Fricke
>
> Lone Star Media
>
> [EMAIL PROTECTED]
>
> Office: (512) 371-1822
>
> Mobile: (512) 626-0528
>
> Fax: (512) 597-0909
>
> Toll Free: (877) 791-7083
>
>
>
> http://www.lonestarmedia.com
>
>
>
>
>
>
>
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