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cur.executemany(sql, rows)
我有rows空的迭代器，它會觸發一個錯誤。MySQLdb遊標不支持空迭代器嗎？
如果我做cur.executemany(sql, list(rows))那麼它工作正常。
File "/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/MySQLdb/cursors.py", line 252, in executemany
r = self._query('\n'.join([query[:p], ',\n'.join(q), query[e:]]))
File "/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/MySQLdb/cursors.py", line 344, in _query
rowcount = self._do_query(q)
File "/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/MySQLdb/cursors.py", line 308, in _do_query
db.query(q)
_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 '' at line 1")
以下是MySQLdb Cursors.py
def executemany(self, query, args):
"""Execute a multi-row query.
query -- string, query to execute on server
args
Sequence of sequences or mappings, parameters to use with
query.
Returns long integer rows affected, if any.
This method improves performance on multiple-row INSERT and
REPLACE. Otherwise it is equivalent to looping over args with
execute().
"""
del self.messages[:]
db = self._get_db()
if not args: return
if isinstance(query, unicode):
query = query.encode(db.unicode_literal.charset)
m = insert_values.search(query)
if not m:
r = 0
for a in args:
r = r + self.execute(query, a)
return r
p = m.start(1)
e = m.end(1)
qv = m.group(1)
try:
q = [ qv % db.literal(a) for a in args ]
except TypeError, msg:
if msg.args[0] in ("not enough arguments for format string",
"not all arguments converted"):
self.errorhandler(self, ProgrammingError, msg.args[0])
else:
self.errorhandler(self, TypeError, msg)
except (SystemExit, KeyboardInterrupt):
raise
except:
exc, value, tb = sys.exc_info()
del tb
self.errorhandler(self, exc, value)
r = self._query('\n'.join([query[:p], ',\n'.join(q), query[e:]]))
if not self._defer_warnings: self._warning_check()
return r