python-2.7 - python sqlite3 .executemany() 带有命名占位符？

Question

这有效:

ss = 'insert into images (file_path) values(?);'
dddd = (('dd1',), ('dd2',))
conn.executemany(ss, dddd)

但是这不会:

s = 'insert into images (file_path) values (:v)'
ddddd = ({':v': 'dd11'}, {':v': 'dd22'})
conn.executemany(s, ddddd)
Traceback (most recent call last):
  File "/Users/Wes/.virtualenvs/ppyy/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 3035, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-31-a999de59f73b>", line 1, in <module>
    conn.executemany(s, ddddd)
ProgrammingError: You did not supply a value for binding 1.

我想知道是否可以在executemany 中使用命名参数，如果可以，如何使用。

documentation第 11.13.3 节一般性地讨论了参数，但没有讨论为其他风格的 .executexxx() 描述的两种类型的参数。

我已查看Python sqlite3 execute with both named and qmark parameters这与executemany无关。

Answer 1

source表明 execute() 只是构造一个单元素列表并调用 executemany()，因此问题不在于 executemany() 本身；相同的调用失败并显示 execute():

>>> conn.execute('SELECT :v', {':v': 42})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
sqlite3.ProgrammingError: You did not supply a value for binding 1.

如Python documentation所示，命名参数不包含冒号:

# And this is the named style:
cur.execute("select * from people where name_last=:who and age=:age", {"who": who, "age": age})

所以你必须使用ddddd = ({'v': 'dd11'}, {'v': 'dd22'})。