【Springboot总结】24 整合Mybatis -- 注解版-优快云博客

1. 创建项目

2. 整合Druid数据源

https://blog.youkuaiyun.com/FullStackDeveloper0/article/details/89552139

3. 创建数据表

4. 创建JavaBean

【提示】别忘记实现相应的get与set方法，以及有参、无参构造器！

5. 注解版

（1）创建mapper接口

//指定这是一个操作数据库的mapper
@Mapper
public interface DepartmentMapper {

    @Select("select * from department where id=#{id}")
    public Department getDeptById(Integer id);

    @Delete("delete from department where id=#{id}")
    public int deleteDeptById(Integer id);

    @Options(useGeneratedKeys = true,keyProperty = "id")
    @Insert("insert into department(departmentName) values(#{departmentName})")
    public int insertDept(Department department);

    @Update("update department set departmentName=#{departmentName} where id=#{id}")
    public int updateDept(Department department);
}

（2） Controller

【提示】数据表的列名与实体的属性不一致，需要开启驼峰命名！

（3）开启驼峰迷命名

@org.springframework.context.annotation.Configuration
public class MyBatisConfig {

    @Bean
    public ConfigurationCustomizer configurationCustomizer(){
        return new ConfigurationCustomizer(){

            @Override
            public void customize(Configuration configuration) {
            	//驼峰命名规则
                configuration.setMapUnderscoreToCamelCase(true);
            }
        };
    }
}

（4）扫描Mapper接口

使用MapperScan批量扫描所有的Mapper接口；
@MapperScan(value = "com.atguigu.springboot.mapper")
@SpringBootApplication
public class SpringBoot06DataMybatisApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringBoot06DataMybatisApplication.class, args);
	}
}

【提示】使用扫描之后，类上就不需要加上@Mapper注解了！