LIMIT [offset,] rows

# 每页10条记录，取第一页，返回的是前10条记录
select * from tableA limit 0,10;
# 每页10条记录，取第二页，返回的是第11条记录，到第20条记录，
select * from tableA limit 10,10;

<dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>4.1.4</version>
    </dependency>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 全局参数 -->
<settings>
  <!-- 使全局的映射器启用或禁用缓存。 -->
  <setting name="cacheEnabled" value="true"/>
  <!-- 全局启用或禁用延迟加载。当禁用时，所有关联对象都会即时加载。 -->
  <setting name="lazyLoadingEnabled" value="true"/>
  <!-- 当启用时，有延迟加载属性的对象在被调用时将会完全加载任意属性。否则，每种属性将会按需要加载。 -->
  <setting name="aggressiveLazyLoading" value="true"/>
  <!-- 是否允许单条sql 返回多个数据集 (取决于驱动的兼容性) default:true -->
  <setting name="multipleResultSetsEnabled" value="true"/>
  <!-- 是否可以使用列的别名 (取决于驱动的兼容性) default:true -->
  <setting name="useColumnLabel" value="true"/>
  <!-- 允许JDBC 生成主键。需要驱动器支持。如果设为了true，这个设置将强制使用被生成的主键，有一些驱动器不兼容不过仍然可以执行。 default:false -->
  <setting name="useGeneratedKeys" value="true"/>
  <!-- 指定 MyBatis 如何自动映射 数据基表的列 NONE：不隐射　PARTIAL:部分 FULL:全部 -->
  <setting name="autoMappingBehavior" value="PARTIAL"/>
  <!-- 这是默认的执行类型 （SIMPLE: 简单； REUSE: 执行器可能重复使用prepared statements语句；BATCH: 执行器可以重复执行语句和批量更新） -->
  <setting name="defaultExecutorType" value="SIMPLE"/>
  <!-- 使用驼峰命名法转换字段。 -->
  <setting name="mapUnderscoreToCamelCase" value="true"/>
  <!-- 设置本地缓存范围 session:就会有数据的共享 statement:语句范围 (这样就不会有数据的共享 ) defalut:session -->
  <setting name="localCacheScope" value="SESSION"/>
  <!-- 设置但JDBC类型为空时,某些驱动程序 要指定值,default:OTHER，插入空值时不需要指定类型 -->
  <setting name="jdbcTypeForNull" value="NULL"/>
</settings>
<plugins>
  <plugin interceptor="com.github.pagehelper.PageHelper">
    <property name="dialect" value="mysql"/>
    <property name="offsetAsPageNum" value="false"/>
    <property name="rowBoundsWithCount" value="false"/>
    <property name="pageSizeZero" value="true"/>
    <property name="reasonable" value="false"/>
    <property name="supportMethodsArguments" value="false"/>
    <property name="returnPageInfo" value="none"/>
  </plugin>
</plugins>
</configuration>　　

@Bean(name = "moonlightSqlSessionFactory")
  @Primary
  public SqlSessionFactory moonlightSqlSessionFactory(@Qualifier("moonlightData") DataSource dataSource) throws Exception {
    SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
    bean.setDataSource(dataSource);
    bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mybatis-mapper/*.xml"));
    bean.setConfigLocation(new ClassPathResource("mybatis-config.xml"));
    return bean.getObject();
  }  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kangaroo.studio.moonlight.dao.mapper.MoonlightMapper">
 <resultMap id="geoFenceList" type="com.kangaroo.studio.moonlight.dao.model.GeoFence">
  <constructor>
   <idArg column="id" javaType="java.lang.Integer" jdbcType="INTEGER" />
   <arg column="name" javaType="java.lang.String" jdbcType="VARCHAR" />
   <arg column="type" javaType="java.lang.Integer" jdbcType="INTEGER" />
   <arg column="group" javaType="java.lang.String" jdbcType="VARCHAR" />
   <arg column="geo" javaType="java.lang.String" jdbcType="VARCHAR" />
   <arg column="createTime" javaType="java.lang.String" jdbcType="VARCHAR" />
   <arg column="updateTime" javaType="java.lang.String" jdbcType="VARCHAR" />
  </constructor>
 </resultMap>
 <sql id="base_column">id, name, type, `group`, geo, createTime, updateTime </sql>
 <select id="queryGeoFence" parameterType="com.kangaroo.studio.moonlight.dao.model.GeoFenceQueryParam" resultMap="geoFenceList">
  select <include refid="base_column"/> from geoFence where 1=1
  <if test="type != null">
   and type = #{type}
  </if>
  <if test="name != null">
   and name like concat('%', #{name},'%')
  </if>
  <if test="group != null">
   and `group` like concat('%', #{group},'%')
  </if>
  <if test="startTime != null">
   and createTime >= #{startTime}
  </if>
  <if test="endTime != null">
   and createTime <= #{endTime}
  </if>
 </select>
</mapper>

List<GeoFence> queryGeoFence(GeoFenceQueryParam geoFenceQueryParam);

@RequestMapping(value = "/fence/query", method = RequestMethod.POST)
  @ResponseBody
  public Response queryFence(@RequestBody GeoFenceQueryParam geoFenceQueryParam) {
    try {
      Integer pageNum = geoFenceQueryParam.getPageNum()!=null?geoFenceQueryParam.getPageNum():1;
      Integer pageSize = geoFenceQueryParam.getPageSize()!=null?geoFenceQueryParam.getPageSize():10;
      PageHelper.startPage(pageNum, pageSize);
      List<GeoFence> list = moonlightMapper.queryGeoFence(geoFenceQueryParam);
      return new Response(ResultCode.SUCCESS, "查询geoFence成功", list);
    } catch (Exception e) {
      logger.error("查询geoFence失败", e);
      return new Response(ResultCode.EXCEPTION, "查询geoFence失败", null);
    }
  }

PageHelper.startPage(1, 10);
List<Country> list;
if(param1 != null){
  list = countryMapper.selectIf(param1);
} else {
  list = new ArrayList<Country>();
}

List<Country> list;
if(param1 != null){
  PageHelper.startPage(1, 10);
  list = countryMapper.selectIf(param1);
} else {
  list = new ArrayList<Country>();
}

List<Country> list;
if(param1 != null){
  PageHelper.startPage(1, 10);
  try{
    list = countryMapper.selectAll();
  } finally {
    PageHelper.clearPage();
  }
} else {
  list = new ArrayList<Country>();
}