What are the ways of writing Mapper

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What are the ways to write Mapper?

First: interface implementation class inherits SqlSessionDaoSupport: to use this method, you need to write mapper interface, mapper interface implementation class, mapper.xml file.

(1) configure the location of mapper.xml in sqlMapConfig.xml

(2) define mapper interface

(3) implement class integration SqlSessionDaoSupport

In the mapper method, you can add, delete, modify and query data by this.getSqlSession ().

(4) spring configuration

The second is to use org.mybatis.spring.mapper.MapperFactoryBean:

(1) configure the location of mapper.xml in sqlMapConfig.xml. If the names of mapper.xml and mappre interfaces are the same and in the same directory, you do not need to configure them here.

(2) define the mapper API:

(3) namespace in mapper.xml is the address of mapper interface

(4) the method name in the mapper interface is consistent with the id of the statement defined in mapper.xml.

(5) defined in Spring

Third: use mapper scanners:

(1) mapper.xml file writing:

Namespace in mapper.xml is the address of the mapper interface

The method name in the mapper interface is consistent with the id of the statement defined in mapper.xml

If you keep the names of the mapper.xml and mapper interfaces the same, you do not need to configure them in sqlMapConfig.xml.

(2) define the mapper API:

Note that the file name of mapper.xml is the same as the interface name of mapper and is placed in the same directory

(3) configure mapper scanner:

(4) obtain the implementation object of mapper from the spring container after using the scanner.

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