a question about mysqldb

Edwin.Madari at VerizonWireless.com Edwin.Madari at VerizonWireless.com
Thu Aug 14 17:39:31 CEST 2008


replace the name of table before calling *.execute.
s.dbptr.execute(str % (e[0]))

good luck.
Edwin
-----Original Message-----
From: python-list-bounces+edwin.madari=verizonwireless.com at python.org
[mailto:python-list-bounces+edwin.madari=verizonwireless.com at python.org]
On Behalf Of Evan
Sent: Thursday, August 14, 2008 11:27 AM
To: python-list at python.org
Subject: a question about mysqldb


a simple problem but I do not know why...:(, could anyone help me?

MySQLdb nominally uses just the %s placeholder style, in my script, i
got error if you want to use placeholder(%s) for table name:
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>> str="select tID,tNote from %s where tID=1"       <-------- check here
>>>
>>> e=["tmp"]

>>> s.dbptr.execute(str,e)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.4/site-packages/MySQLdb/cursors.py", line
166, in execute
    self.errorhandler(self, exc, value)
  File "/usr/lib/python2.4/site-packages/MySQLdb/connections.py", line
35, in defaulterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.ProgrammingError: (1064, "You have an error in your
SQL syntax; check the manual that corresponds to your MySQL server
version for the right syntax to use near ''tmp') where tID=1' at line
1")
>>>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


But sql worked but the I got no query result:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>> str="select tID,tNote from tmp where %s = %s"      <----------check here
>>> e=["tID",int(1)]
>>> s.dbptr.execute(str,e)
0L    <------------------ check here
>>>
>>> s.dbptr.fetchall()
()
>>>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++


And then, it worked if I do:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>> str="select tID,tNote from %s where %s = %s" % ("tmp","tID",1)
>>>
>>> str
'select tID,tNote from tmp where tID = 1'
>>> s.dbptr.execute(str)
1L
>>>
>>> s.dbptr.fetchall()
({'tID': 1L, 'tNote': 'kao'},)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
mysql> desc tmp
    -> ;
+-------+-------------+------+-----+---------+----------------+
| Field | Type        | Null | Key | Default | Extra          |
+-------+-------------+------+-----+---------+----------------+
| tID   | int(11)     | NO   | PRI | NULL    | auto_increment |
| tDate | date        | YES  |     | NULL    |                |
| tSID  | int(11)     | NO   |     | NULL    |                |
| tCom  | varchar(15) | YES  |     | NULL    |                |
| tNote | text        | YES  |     | NULL    |                |
+-------+-------------+------+-----+---------+----------------+
5 rows in set (0.00 sec)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

mysql>
mysql>

Thanks,
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