Re: proposal: doc: simplify examples of dynamic SQL

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

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';