After issuing a SELECT query with <sql:query>, you can access the row
count with ${rs.rowCount} (where rs is the result set variable).

However, in other APIs such as Perl DBI, the equivalent construct
is deprecated because some drivers do not return a count reliably;
the recommended course of action is to count the rows as you fetch
them.

Is there any such constraint or caution in JSTL?

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