This is typical of frameworks that map object models to relational database models.
这是将对象模型映射到关系数据库模型的一种典型框架。
One easy way to do that is with a Map object that associates the variable name with its value.
做到这一点最容易的一种方式是，利用一个map对象将变量名与它的值相关联。
The first line is the output of the Map object, and the second line is the UserInfo object reference.
第一行是map对象的输出，第二行是UserInfo对象引用。
The first line is the output of the Map object, and the second line is the UserInfo object reference.
第一行是map对象的输出，第二行是UserInfo对象引用。
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