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当我在控制台中尝试时,下面的查询正常工作。MySQL查询在包装在perl DBI中时似乎给出了不同的结果
mysql> SELECT COUNT(l.ID), a.MAX_PER_PRD, a.PLURAL, d.TIME_DENOM FROM logro l, challenge c, lib_accomp_type a, lib_deporte d WHERE l.PERIOD=3 AND l.GAME_ID=2 AND l.PLR_ID=3 AND l.ACC_TYPE_ID=11 AND a.sport=d.ID AND c.ACC_TYPE_ID=a.ID AND l.ACC_TYPE_ID=c.ACC_TYPE_ID;
+-------------+-------------+--------------------+------------+
| COUNT(l.ID) | MAX_PER_PRD | PLURAL | TIME_DENOM |
+-------------+-------------+--------------------+------------+
| 0 | 3 | general commodities| quarter |
+-------------+-------------+--------------------+------------+
1 row in set (0.01 sec)
然而,当我把它包在一个perl-> DBI语句句柄,并用$ sth->获取它fetchrow_array第二个值是不确定的。
my $q = "SELECT COUNT(l.ID), a.MAX_PER_PRD, a.PLURAL, d.TIME_DENOM
FROM logro l, challenge c, lib_accomp_type a, lib_deporte d
WHERE l.PERIOD=?
AND l.GAME_ID=?
AND l.PLR_ID=?
AND l.ACC_TYPE_ID=?
AND a.sport=d.ID
AND c.ACC_TYPE_ID=a.ID
AND l.ACC_TYPE_ID=c.ACC_TYPE_ID";
my $sth = $dbh->prepare($q);
$sth->execute(3, 2, 3, 11);
my ($CNT, $MAX, $ANAMEP, $TD) = $sth->fetchrow_array;
print "COUNT: ", $CNT;
print "MAX: ", $MAX;
$ perl test_sql2.pl
Use of uninitialized value $MAX in print at test_sql2.pl line 29.
COUNT: 0MAX:
任何想法,我可能做错了什么?
我放弃了,并将其分为两个不同的查询。 – gatorreina