You generally use placeholders or DBI's quote but usually not both. I never use quote myself. placeholders are generally the way to go because you can often prepare the SQL once with the placeholders and execute as many times as you like - thus saving parsing and preparing of the SQL repeatedly.

When DBI says don't quote placeholders it means don't run the quote method on placeholders i.e., don't do:

  $s = $h->prepare(/select * from table where a = ?/);
  $s->execute($h->quote("myvalueforcolumna"));

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You use quote when you are building all the SQL yourself and not using placeholders so the above would be:

  $s = $h->prepare(q/select * from table where a = / . $h->quote("myva
+lueforcolumna");

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Try and stick with placeholders. I don't know your schema but you can usually do something like:

  select col1, col2, col3 from tab_name where (? is null or foo = ?) a
+nd (? is null or bar = ?) and (? is null or baz = ?)

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then pass each value for foo, bar and baz twice

In reply to Re^3: DBI, place holders and CGI forms by mje
in thread DBI, place holders and CGI forms by Anonymous Monk

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