2014-10-03 5:16 GMT+02:00 Jim Nasby <jim.na...@bluetreble.com>:

> On 10/2/14, 6:51 AM, Pavel Stehule wrote:
>> EXECUTE format('UPDATE tbl SET %I = newvalue WHERE key = %L',
>>                     colname, keyvalue)
>> or
> -1, because of quoting issues

No it isn't. I is 100% safe

>  EXECUTE format('UPDATE tbl SET %I = newvalue WHERE key = $1',
>>                     colname)
>>   USING keyvalue;
> Better, but I think it should really be quote_ident( colname )
>> A old examples are very instructive, but little bit less readable and
>> maybe too complex for beginners.
>> Opinions?
> Honestly, I'm not to fond of either. format() is a heck of a lot nicer
> than a forest of ||'s, but I think it still falls short of what we'd really
> want here which is some kind of variable substitution or even a templating
> language. IE:
> EXECUTE 'UDPATE tbl SET $colname = newvalue WHERE key = $keyvalue';

Your proposal significantly increase a work with string. Escaping and
quoting depends on context, and should be different in different context.
In PHP or Perl, this technique is the most simple backdoor for SQL


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