Mybatis的5种分页方式

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mapper.UserMapper"><!-- 实体类：public class User {private Integer id;private String name;private Integer age;private String email;private Integer sex;private Cat cat;private List<Course> courseList;}public class Cat {private String catname;}public class Course {private String coursename;private String teacher;private Integer userid;}--><!-- 第一种分页方式：limit，借助Sql语句进行分页。postman：localhost:8080/limitPageXxxController.java：@RequestMapping("limitPage")public void limitPage1(){Integer pageNum = 2;                            // ⻚码Integer pageSize = 3;                           // 每⻚显示记录条数Integer startIndex = (pageNum - 1) * pageSize;  // 起始下标List<User> userList = userMapper.selectAllUserByLimitPage(startIndex, pageSize);userList.forEach(user -> System.out.println(user));}XxxMapper.java：List<User> selectAllUserByLimitPage(@Param("startIndex") Integer startIndex, @Param("pageSize") Integer pageSize);效果：User{id=4, name='Sandy', age=21, email='test4@baomidou.com', sex=null, cat=null, courseList=null}User{id=5, name='Billie', age=24, email='test5@baomidou.com', sex=null, cat=null, courseList=null}--><select id="selectAllUserByLimitPage" resultType="User">select * from user limit #{startIndex},#{pageSize}</select><!-- 第二种分页方式：自定义拦截器，拦截器分页。拦截器功能的实现，在intercept方法中获取到select标签和sql语句的相关信息，拦截所有以ByPage结尾的select查询，并且统一在查询语句后面添加limit分页的相关语句，统一实现分页功能。postman：localhost:8080/selectAllUserByInterceptorByPageXxxController.java：@RequestMapping("selectAllUserByInterceptorByPage")public void selectAllUserByInterceptorByPage() {Map<String, Object> data = new HashMap();data.put("currPage", 1);data.put("pageSize", 4);List<User> userList = userMapper.selectAllUserByInterceptorByPage(data);userList.forEach(user -> System.out.println(user));}XxxMapper.java：List<User> selectAllUserByInterceptor(Map<String,Object> data);--><!--xml文件的select语句--><select id="selectAllUserByInterceptorByPage" parameterType="map" resultType="User">select * from user</select><!-- 第三种分页方式：PageHelper插件，拦截器分页。limit方法获取数据不难，难的是获取分⻚相关的数据⽐较难。可以借助mybatis的PageHelper插件。使⽤PageHelper插件进⾏分⻚，更加的便捷。准备工作：第⼀步：pom.xml，引⼊依赖<dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.3.1</version></dependency>第⼆步：mybatis-config.xml⽂件中配置插件，typeAliases标签下⾯进⾏配置：<plugins><plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin></plugins>第二步：application.yml中配置插件# PageHelper分页插件pagehelper:helperDialect: mysqlsupportMethodsArguments: trueparams: count=countSqlpostman：localhost:8080/pageHelperPageXxxController.java：@RequestMapping("pageHelperPage")public void pageHelperPage(){// 开启分⻚：在查询语句之前开启分⻚功能。PageHelper.startPage(2, 2);// 执⾏查询语句List<User> userList = userMapper.selectAllUserByPageHelperPage();// 获取分⻚信息对象：在查询语句之后封装PageInfo对象。（PageInfo对象将来会存储到request域当中。在⻚⾯上展示。）PageInfo<User> pageInfo = new PageInfo<>(userList, 5);System.out.println(pageInfo);}XxxMapper.java：List<User> selectAllUserByPageHelperPage();--><select id="selectAllUserByPageHelperPage" resultType="User">select * from user</select><!-- 第四种分页方式：RowBoundsRowBounds本质就是封装了limit,我们只需要在业务层关注分页即可,，无须再传入指定数据。Mybatis内置了一个专门处理分页的类: RowBounds, 我们使用它可以轻松完成分页。分页查询所有用户，通过自带的RowBoundspostman：localhost:8080/pageRowBoundsPageXxxController.java：@RequestMapping("pageRowBoundsPage")public void pageRowBoundsPage(){int currPage = 3;int pageSize = 2;//注意:currPage和start别搞错了，一个表示当前页码，一个是从第几行读取记录int start = (currPage-1) *pageSize;//计算从第几行读取记录RowBounds rowBounds = new RowBounds(start,pageSize);List<User> userList = userMapper.selectAllUserByRowBounds(rowBounds);userList.forEach(user -> System.out.println(user));}XxxMapper.java：List<User> selectAllUserByRowBounds(RowBounds rowBounds);--><select id="selectAllUserByRowBounds" resultType="User">select * from user</select>
</mapper><!--（1）报错:pagehelper分页不生效不能引入pagehelper，因为这样会导致分页插件不起作用，除非在mybatisConfig.xml文件中再加入配置https://blog.csdn.net/amosjob/article/details/117250315?utm_medium=distribute.wap_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-0-117250315-blog-86480431.wap_relevant_featuresortv7&spm=1001.2101.3001.4242.1（2）报错：版本冲突版本冲突：http://www.yiduhao.com/index.php/index/news/news_detail.html?id=127（3）报错：Invalid bound statement (not found): ] with root causemapper-locations: classpath:mapper/*.xml配置：https://blog.csdn.net/hmonjcae/article/details/104481784（4）报错：不能用类别名mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  #日志type-aliases-package: com.pojo                           #类别名mapper-locations: classpath:mapper/*.xml                 #配置XxxMapper.xml所在路径（5）报错：spring boot中interceptor拦截器未生效的解决本次解决的方案：@Component以后遇到大麻烦可以参考：http://events.jianshu.io/p/3309899ec399（6）参考：dljd - 老杜 - MyBatis讲义https://mikechen.cc/23836.html#%E4%BD%BF%E7%94%A8PageHelper%E6%8F%92%E4%BB%B6%E5%88%86%E9%A1%B5https://blog.csdn.net/m0_46761060/article/details/124144477（7）更多地了解https://www.cnblogs.com/fulong133/p/12711698.html（PageInfo属性表、PageInfo类的使用——Java Page分页显示、MyBatis分页插件－PageHelper的配置与应用）-->

附：项目的目标结构和关键代码

application.yml文件：

spring:datasource:type: com.zaxxer.hikari.HikariDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverjdbc-url: jdbc:mysql://10.203.5.185:3306/fLearn?serverTimezone=GMT%2B8&characterEncoding=utf-8&useSSL=falseusername: rootpassword: MySQL#567890
mybatis-plus:configuration:log-impl: org.apache.ibatis.logging.stdout.StdOutImpltype-aliases-package: com.pojomapper-locations: classpath:mapper/*.xml
# PageHelper分页插件
pagehelper:helperDialect: mysqlreasonable: falsesupportMethodsArguments: trueparams: count=countSql

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.5.6</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>boot_recieve_data</artifactId><version>0.0.1-SNAPSHOT</version><name>boot_recieve_data</name><description>Demo project for Spring Boot</description><properties><java.version>8</java.version><mybatis-plus-boot-starter.version>3.3.2</mybatis-plus-boot-starter.version><druid.version>1.2.8</druid.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>${mybatis-plus-boot-starter.version}</version></dependency><!-- Mysql驱动包 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.46</version></dependency><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.4.0</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins><resources><resource><directory>src/main/java</directory><!--所在的目录--><includes><include>**/*.properties</include><!--包括.properties、.xml文件都会扫描到--><include>**/*.xml</include></includes><filtering> false </filtering></resource></resources></build></project>

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