<dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.1.1</version>
    </dependency>
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus</artifactId>
      <version>2.0-beta</version>
    </dependency>

@Configuration
public class MybatisPlusConfig {
  @Autowired
  private DataSource dataSource;

  @Autowired
  private MybatisProperties properties;

  @Autowired
  private ResourceLoader resourceLoader = new DefaultResourceLoader();

  @Autowired(required = false)
  private Interceptor[] interceptors;

  @Autowired(required = false)
  private DatabaseIdProvider databaseIdProvider;

  /**
   *  mybatis-plus分页插件
   */
  @Bean
  public PaginationInterceptor paginationInterceptor() {
    PaginationInterceptor page = new PaginationInterceptor();
    page.setDialectType("mysql");
    return page;
  }
  /**
   * 这里全部使用mybatis-autoconfigure 已经自动加载的资源。不手动指定
   * 配置文件和mybatis-boot的配置文件同步
   * @return
   */
  @Bean
  public MybatisSqlSessionFactoryBean mybatisSqlSessionFactoryBean() {
    MybatisSqlSessionFactoryBean mybatisPlus = new MybatisSqlSessionFactoryBean();
    mybatisPlus.setDataSource(dataSource);
    mybatisPlus.setVfs(SpringBootVFS.class);
    if (StringUtils.hasText(this.properties.getConfigLocation())) {
      mybatisPlus.setConfigLocation(this.resourceLoader.getResource(this.properties.getConfigLocation()));
    }
    mybatisPlus.setConfiguration(properties.getConfiguration());
    if (!ObjectUtils.isEmpty(this.interceptors)) {
      mybatisPlus.setPlugins(this.interceptors);
    }
    MybatisConfiguration mc = new MybatisConfiguration();
    mc.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);
    mybatisPlus.setConfiguration(mc);
    if (this.databaseIdProvider != null) {
      mybatisPlus.setDatabaseIdProvider(this.databaseIdProvider);
    }
    if (StringUtils.hasLength(this.properties.getTypeAliasesPackage())) {
      mybatisPlus.setTypeAliasesPackage(this.properties.getTypeAliasesPackage());
    }
    if (StringUtils.hasLength(this.properties.getTypeHandlersPackage())) {
      mybatisPlus.setTypeHandlersPackage(this.properties.getTypeHandlersPackage());
    }
    if (!ObjectUtils.isEmpty(this.properties.resolveMapperLocations())) {
      mybatisPlus.setMapperLocations(this.properties.resolveMapperLocations());
    }
    return mybatisPlus;
  }
}

@Bean
  public PaginationInterceptor paginationInterceptor() {
    PaginationInterceptor page = new PaginationInterceptor();
    page.setDialectType("mysql");
    return page;
  }

# mybatis_config
mybatis.mapper-locations=classpath:com/boot/mapper/xml/*Mapper.xml 
mybatis.typeAliasesPackage=com.boot.entity

@MapperScan("com.boot.mapper*")
@SpringBootApplication
public class BootApplication {

//可以在controller：
Egg egg = new Egg();
eggService.insert(egg);
//可以在service
Egg egg = new Egg();
this.selectList(new EntityWrapper<Egg >(egg));//mybatisplus提供依靠实体查询的方法的写法
//也可以
mapper.selectList(new EntityWrapper<Egg >(egg));

<select id="getPage" resultMap="RoleResultMap">
  select 
  <include refid="columns"/> 
  from ella_role 
  <include refid="where"/>
 </select>

public Page<EllaRole> getPage(RoleParam param) {
//new 一个page 初始化传入current当前页，size每页几个，order 排序（默认asc要改的话page.setAsc(false);）
    Page<Role> page = new Page<Role>(param.getCurrent(), param.getSize(), param.getOrder());
    page.setRecords(iRoleMapper.getPage(page, param));
    return page;
  }

mybatisPlus.setDbColumnUnderline(true);