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Re: update mysql without manually tying SET statements [message #178165 is a reply to message #178161]

Wed, 16 May 2012 16:06

Thomas 'PointedEars'
Messages: 701
Registered: October 2010

Karma:

Senior Member

Shake wrote:

> El 16/05/2012 16:12, apavluck(at)gmail(dot)com escribió:
>> I am trying to setup some generic code that will allow me to update a
>> mysql database via form and php. I can capture the data in the row of
>> the database that I want to update. I can present that in a form
>> populated with the existing values. What I can't figure out how to do is
>> to avoid typing out the SET statements in the update query.
>> [...]
>> The reason I want to do this is because I manage many projects all with
>> their own variables and databases and the update is the only part that I
>> have to type in manually.
>
> Withouth entering in details, security and best practices...
>
> $sqlString = ' UPDATE blablalba SET ';

The leading space does not make sense.

> foreach($_POST as $key => $value)
> {
> $sqlString .= " `$key` = '$value', ";
> }
>
> // You have to deal here a little with the last comma ;)

That is one reason why you should _not_ build queries that way, but at least
join an array instead. See also <news:1762069(dot)ZWGnKmheAe(at)PointedEars(dot)de>.

> It's possible not all data in $_POST are fields of the database. You
> could manage prefixing the indexes or other ways...
>
> foreach($_POST as $key => $value)
> {
> if(!preg_match('/^my_prefix.+/',$key)) continue;
> $sqlString .= " `$key` = '$value', ";
> }

Or you filter out the items that you do not want, by key, using the
array_filter() function, which also returns the array to join that
I mentioned above.

<http://php.net/array_filter>

PointedEars
--
Sometimes, what you learn is wrong. If those wrong ideas are close to the
root of the knowledge tree you build on a particular subject, pruning the
bad branches can sometimes cause the whole tree to collapse.
-- Mike Duffy in cljs, <news:Xns9FB6521286DB8invalidcom(at)94(dot)75(dot)214(dot)39>

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[Message index]

		update mysql without manually tying SET statements By: Alex Pavluck on Wed, 16 May 2012 14:12
		Re: update mysql without manually tying SET statements By: Shake on Wed, 16 May 2012 14:23
		Re: update mysql without manually tying SET statements By: Thomas 'PointedEars' on Wed, 16 May 2012 16:06
		Re: update mysql without manually tying SET statements By: Alex Pavluck on Thu, 17 May 2012 18:06
		Re: update mysql without manually tying SET statements By: Shake on Thu, 17 May 2012 19:06
		Re: update mysql without manually tying SET statements By: M. Strobel on Wed, 16 May 2012 20:48
		Re: update mysql without manually tying SET statements By: IRC on Thu, 17 May 2012 11:14
		Re: update mysql without manually tying SET statements By: Erwin Moller on Fri, 18 May 2012 08:49
		Re: update mysql without manually tying SET statements By: bill on Thu, 17 May 2012 11:09

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