comment on

Use placeholders, but not because they're more efficient. Use them because they're safer.

What if the value of $XYZ is a single quote? Your SQL will no longer parse. You either have to escape the quotes in $XYZ, or use placeholders.

The efficiency issues mentioned above are true, but not worth worrying about right now. The gains from using placeholders are likely to be small. Chances are that the bottleneck on the program will be the DB updating itself, rather than the parsing.

As an aside, I despair of the flag of efficiency being raised at every opportunity, to the exclusion of correctness and safety. See A Tirade Against The Cult Of Performance .

xoxo,
Andy
--
<megaphone> Throw down the gun and tiara and come out of the float! </megaphone>

In reply to Placeholders, safety and the relative unimportance of efficiency by petdance
in thread SQL in Perl and setting variables by Zo

Are you posting in the right place? Check out Where do I post X? to know for sure.
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
Want more info? How to link or How to display code and escape characters are good places to start.


good chemistry is complicated, and a little bit messy -LW
	PerlMonks