def table_to_csv(table, engine, filepath, chunksize=<NUM_LIT:1000>, overwrite=False):
sql = select([table])<EOL>sql_to_csv(sql, engine, filepath, chunksize)<EOL>
Export entire table to a csv file.

:param table: :class:`sqlalchemy.Table` instance.
:param engine: :class:`sqlalchemy.engine.base.Engine`.
:param filepath: file path.
:param chunksize: number of rows write to csv each time.
:param overwrite: bool, if True, avoid to overite existing file.

**中文文档**

将整个表中的所有数据, 写入csv文件。