Mapper系列三：自定义Mapper接口

自定义 Mapper接口。根据开发的实际需要对 Mapper接口进行定制

1、创建自定义 Mapper接口。注意：自定义的Mapper接口不能和EmployeeMapper放在同一个包下。

/**
 * 自定义接口根据需要选择要继承的接口
 */
public interface MyMapper<T> 
		extends SelectAllMapper<T>,SelectByExampleMapper<T> {

}

2、EmployeeMapper 继承自定义的Mapper接口

public interface EmployeeMapper extends MyMapper<Employee> {

}

3、在spring配置文件中配置自定义Mapper接口

<bean class="tk.mybatis.spring.mapper.MapperScannerConfigurer">
	<property name="basePackage" value="com.atguigu.mapper.mappers"/>
	<!-- 在配置 MapperScannerConfigurer 中注册自定义Mapper接口 MyMapper<T>  -->	
	<property name="properties">
		<value>
			mappers=com.atguigu.mapper.mine_mappers.MyMapper
		</value>
	</property>
</bean>

测试：

public class MyMapperTest {
	
	public static void main(String[] args) {
		ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("spring-context.xml");
		EmployeeService employeeService = context.getBean(EmployeeService.class);
		
		List<Employee> empList = employeeService.getAll();
		for (Employee employee : empList) {
			System.out.println(employee);
		}
		
		context.close();
	}

}