要将数据加载到数据库中，需要定义加载映射，以将来自数据文件的记录中的字段与数据表中的列相关联。

To load data into a database, you define a load map, which associates fields from records in a data file to columns in a database table.

youdao

每个多对多的关联映射到唯一的表。

Each many-to-many association maps to a distinct table.

youdao

映射与前面的关联很相似；你将找到一个与每一个类同名的相关表。

The mapping is quite similar to the previous relation; you will find a table corresponding to each class with an identical name.

youdao