I suspect your definition of a "placeholder" is my definition of a "host variable".
They are essentially the same thing. Though when I think of 'host variables' (or bind variables), it's usually in languages that support embedding a named variable inside the sql statement, e.g. "select stuff from table where id_column = :id_number", and 'id_number' is a variable in the program. The Perl/DBI way is to use a question mark instead of a program variable (which is what many databases natively support anyway), then bind a value to it when (or before) you execute the statement. (some databases support named parameters which would look like a host variable, but in perl you'd still have to bind a value to it, so it wouldn't be an actual perl 'host' variable).
Placeholders, bind variables, host variables, or whatever you want to call them are a good idea in any programming language database API that supports them, and pasting raw unfiltered (and untrusted) user input into a SQL statement in any programming language is bad.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||