dbm
— 简单数据库接口
¶
注意
The
dbm
module has been renamed to
dbm.ndbm
in Python 3. The
2to3
tool will automatically adapt imports when converting your sources to Python 3.
The
dbm
module provides an interface to the Unix “(n)dbm” library. Dbm objects behave like mappings (dictionaries), except that keys and values are always strings. Printing a dbm object doesn’t print the keys and values, and the
items()
and
values()
methods are not supported.
This module can be used with the “classic” ndbm interface, the BSD DB compatibility interface, or the GNU GDBM compatibility interface. On Unix, the configure script will attempt to locate the appropriate header file to simplify building this module.
模块定义如下：
dbm.
error
¶
Raised on dbm-specific errors, such as I/O errors.
KeyError
is raised for general mapping errors like specifying an incorrect key.
dbm.
library
¶
Name of the
ndbm
implementation library used.
dbm.
open
(
filename
[
,
flag
[
,
mode
]
]
)
¶
Open a dbm database and return a dbm object. The
filename
argument is the name of the database file (without the
.dir
or
.pag
extensions; note that the BSD DB implementation of the interface will append the extension
.db
and only create one file).
可选 flag argument must be one of these values:
|
值 |
含义 |
|---|---|
|
|
Open existing database for reading only (default) |
|
|
Open existing database for reading and writing |
|
|
Open database for reading and writing, creating it if it doesn’t exist |
|
|
Always create a new, empty database, open for reading and writing |
可选
mode
argument is the Unix mode of the file, used only when the database has to be created. It defaults to octal
0666
(and will be modified by the prevailing umask).
In addition to the dictionary-like methods,
dbm
objects provide the following method:
dbm.
close
(
)
¶
Close the
dbm
database.
另请参阅