The correct answer for MySQL (at least as of 5.0).
sub table_exists {
my ($dbh, $table, $schema) = @_;
unless ($schema) {
($schema) = $dbh->selectrow_array('SELECT DATABASE()');
}
my ($exists) = $dbh->selectrow_array(
"SELECT COUNT(*) FROM information_schema.tables WHERE table_sc
+hema = ? AND table_name = ?",
undef, $schema, $table,
);
return $exists > 0;
}
My criteria for good software:
- Does it work?
- Can someone else come in, make a change, and be reasonably certain no bugs were introduced?
-
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.
|