Mybatis plus 分页插件使用

1、导入依赖，注意版本问题

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.11</version>
        <relativePath/>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>MybatisplusDemo</artifactId>
    <version>1.0-RELEASE</version>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.16</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!--mybatis plus和springboot整合-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

2、配置分页插件

@Configuration
public class MybatisPlusPageConfig {

    /**
     * 旧版本配置(已过时)
     */
    /*@Bean
    public PaginationInterceptor paginationInterceptor(){
        return new PaginationInterceptor();
    }*/

    /**
     * 新的分页插件（推荐）
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }

}

3、编写测试案列

需要自行搭建好工程，不会整合mybatis plus的同志，可以去学习一下！

这里跳过整合过程，直接编写案列测试：

@SpringBootTest(classes = MybatisplusDemoApp.class)
@Log4j2
public class TestQuery {

    @Autowired
    private Test3Dao test3Dao;

    @Test
    public void showTest3(){
        // current 1 表示当前页
        // size 2 表示分页大小
        Page<Test3> page = new Page<>(1,3);
        Page<Test3> test3Page = test3Dao.selectPage(page, new QueryWrapper<Test3>().orderByDesc("birthday"));
        log.info("总条数：{}",test3Page.getTotal());
        log.info("总页数：{}",test3Page.getPages());
        log.info("当前页：{}",test3Page.getCurrent());
        log.info("查询数据：{}",test3Page.getRecords());
    }
}

测试效果：