I would send different statements to MySQL, based on the MySQL version.
my ($major,$minor) = get_my_sql_version();
my $statement;
if ($major < 5) {
$statement = 'show variables';
} elsif ("$major.$minor" eq "5.0") {
$statement = 'show global variables';
} elsif ("$major.$minor" gt "5.0") {
$statement = 'Select * from information_schema.global_variables or
+der by 1';
};
$dbh->execute($statement);
...
The implementation of get_my_sql_version() is left as an exercise to the reader. As literature, I recommend get mysql version.
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