今天在使用format拼sql语句时遇到一下问题:
其中数据库中first_16字段是text类型
>>> s = '12345'
>>> q0 = "select nid from news_simhash where first_16={0}"
>>> q1 = "select nid from news_simhash where first_16='{0}'"
>>> from doc_process import get_postgredb_query
>>> conn, cursor = get_postgredb_query()
>>> cursor.execute(q0.format(s)) #出错
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
psycopg2.ProgrammingError: operator does not exist: text = integer
>>> conn2, cursor2 = get_postgredb_query()
>>> cursor2.execute(q1.format(s)) #正确执行
上述q0和q1执行format:
>>> q0.format(s)
'select nid from news_simhash where first_16=12345'
>>> q1.format(s)
"select nid from news_simhash where first_16='12345'"
数据看中字段first_16是text类型,q0.format(s)出现text=int,执行出错; 所有像q1一样手动添加单引号是必须的.
原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/9342.html