Mysql Perl sql全选

这是我的密码

my $results = $dbh->selectall_hashref('SELECT * FROM sample.teachers where term like "$searchterm%"', 'teacher');
my $searchedresults= "";
foreach my $e (keys %$results) {
    print "$e\n";
    print "searching\n";
    $searchedresults = $e;
    }
    print $searchresult."\n";

我正在尝试从mysql服务器中的表中搜索。但似乎不起作用 我使用硬编码的方法测试了它，用普通字符串替换$searchterm，这很有效。然而，我需要使用$searchterm，但我不明白为什么它不能工作

my $results = $dbh->selectall_hashref(
   'SELECT * FROM sample.teachers where term like '.$dbh->quote("$searchterm%"),
   'teacher'
);

或

my $results = $dbh->selectall_hashref(
   'SELECT * FROM sample.teachers where term like ?,
   'teacher',
   undef,
   "$searchterm%"
);