有关 torndb query 传入变量的问题

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In [43]: conn.query('select %s from topic order by %s limit 2', 'id', 'id desc')
Out[43]: [{'id': u'id'}, {'id': u'id'}]

In [44]: conn.query('select id from topic order by id desc limit 2')
Out[44]: [{'id': 10L}, {'id': 9L}]

一直是这么用的, 之前都没发现问题, 怎么现在就有问题了呢? 真是搞不懂了, 为啥以上两个执行结果不一样呢? query的变量不是这么传进去的吗

desc

conn.query

变量

1 replies • 2014-12-09 00:29:59 +08:00

1

geew

OP

Dec 9, 2014

解决了是我的用法有问题, %s是用来传变量的, 不应该用来传列名或者sql关键字, 因为这会被mysqldb做转化.
In [43]: conn.query('select %s from topic order by %s limit 2', 'id', 'id desc')
Out[43]: [{'id': u'id'}, {'id': u'id'}]
-- 实际执行的是 select 'id' from topic order by 'id desc' limit 2