InvoiceDataVO invoiceDataVO = mapper.map(invoiceData, InvoiceDataVO.class);

As an AI language model, I do not have enough context to provide a detailed explanation of this code. However, I can provide some general information.

This code seems to be using a mapper object to convert an object of type "invoiceData" to an object of type "InvoiceDataVO". The mapper object seems to be using some kind of mapping logic to perform this conversion.

It is possible that this code is part of a larger program or system that deals with invoices and their data. Without more information, it is difficult to determine the exact purpose of this code.

相关问题

解释SqlSession sqlSession = this.build.openSession(); Mapper mapper = sqlSession.getMapper(Mapper.class); ArrayList<Equipment> equipments = mapper.SelectEquipment(floor, calssroomnumber);//返回到教师号 return equipments;

这段代码使用了MyBatis框架来访问数据库。让我来解释一下每一行的作用：

1. `SqlSession sqlSession = this.build.openSession();`
这行代码创建了一个`SqlSession`对象，它负责与数据库进行交互。`this.build`是一个`SqlSessionFactory`对象，调用其`openSession()`方法可以创建一个新的`SqlSession`实例。

2. `Mapper mapper = sqlSession.getMapper(Mapper.class);`
这行代码通过`getMapper()`方法从`SqlSession`中获取了一个映射器对象，这个映射器对象将用于执行数据库操作。`Mapper.class`是您自己定义的映射器接口。

3. `ArrayList<Equipment> equipments = mapper.SelectEquipment(floor, calssroomnumber);`
这行代码调用了映射器接口中的`SelectEquipment()`方法，该方法执行了一个查询操作，并返回一个包含查询结果的`ArrayList<Equipment>`对象。`floor`和`calssroomnumber`是传递给查询方法的参数。

4. `return equipments;`
最后，查询结果被返回给调用此方法的代码，您可以在该处对查询结果进行进一步处理或使用。

总结起来，这段代码的作用是通过MyBatis框架执行数据库查询操作。它创建了一个会话（`SqlSession`），获取了映射器（`Mapper`），并使用映射器执行了一个查询操作，将结果返回给调用者。

@MapperScan(annotationClass = Mapper.class)

这段代码是用于在Spring Boot中扫描MyBatis Mapper接口的注解。@MapperScan注解指定了要扫描的注解类型为Mapper.class，这样Spring Boot就会自动扫描这些接口并将它们注册为MyBatis的Mapper接口。这样，在需要使用Mapper接口的地方，我们只需要使用@Autowired注解将Mapper接口注入进来即可。