pageHelper分页插件的使用

1. 导入依赖坐标

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>4.1.6</version>
</dependency>

2. MyBatis配置文件（整合在Spring）（Springboot不用这一步）

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="typeAliasesPackage" value="com.lagou.domain"/>
        <property name="plugins">
            <array>
                <bean class="com.github.pagehelper.PageHelper">
                    <property name="properties">
                        <value>helperDialect=mysql</value>
                    </property>
                </bean>
            </array>
        </property>
            
</bean>

3. 代码使用（Service层）

    @Override
    public PageInfo<PromotionAd> findAllPromotionAdByPage(PromotionAdVO promotionAdVO) {

        PageHelper.startPage(promotionAdVO.getCurrentPage(),promotionAdVO.getPageSize());
        List<PromotionAd> allPromotionAdByPage = promotionAdMapper.findAllPromotionAdByPage();

        PageInfo<PromotionAd> pageInfo = new PageInfo<>(allPromotionAdByPage);

        return pageInfo;
    }