Changes to the paging plug-in after Mybatis Plus version 3.4

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一、MybatisPlusInterceptor

Starting from Mybatis Plus 3.4.0 version, the old version of PaginationInterceptor is no longer used, but MybatisPlusInterceptor is used.

MybatisPlusInterceptor is a series of interceptor chains that implement InnerInterceptor, which can also be understood as a collection. Can include some interceptors as follows

Automatic pagination: PaginationInnerInterceptor (most commonly used)
Multi-tenant: TenantLineInnerInterceptor
Dynamic table name: DynamicTableNameInnerInterceptor
Optimistic lock: OptimisticLockerInnerInterceptor
sql performance specification: IllegalSQLInnerInterceptor
Prevent full table update and deletion: BlockAttackInnerInterceptor

Second, the configuration method of the old version of the paging plug-in (Before Mybatis Plus 3.4.0 version)

@Configuration
@MapperScan(basePackages = {"com.zimug.**.mapper"})
public class MybatisPlusConfig {

    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求  默认false
        // paginationInterceptor.setOverflow(false);
        // 设置最大单页限制数量，默认 500 条，-1 不受限制
        // paginationInterceptor.setLimit(500);
        // 开启 count 的 join 优化,只针对部分 left join
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }
}

3. New configuration method of paging plug-in (Mybatis Plus 3.4.0 version and later versions)

The new paging plug-in, one mitigation and two mitigation follow the rules of mybatis, you need to set MybatisConfiguration#useDeprecatedExecutor = false to avoid caching problems

@Configuration
@MapperScan(basePackages = {"com.zimug.**.mapper"})
public class MybatisPlusConfig {

  /**
   * 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)
   */
  @Bean
  public MybatisPlusInterceptor mybatisPlusInterceptor() {
    MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
    //向Mybatis过滤器链中添加分页拦截器
    interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
    //还可以添加i他的拦截器
    return interceptor;
  }

  @Bean
  public ConfigurationCustomizer configurationCustomizer() {
    return configuration -> configuration.setUseDeprecatedExecutor(false);
  }
}

Fourth, the use of paging query

The use of paging query has not changed, and it is still consistent with the previous version of Mybatis, and there is no change . Here is a simple example

Page<SysUserOrg> page = new Page<> (pageNum,pageSize);   //查询第pageNum页，每页pageSize条数据
//将分页参数page作为Mybatis或Mybatis Plus的第一个参数传入持久层函数，即可完成分页查询
return mySystemMapper.selectUser(page, 其他参数 );

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