（二）整合分页插件pagehelper

谁借莪１个温暖的怀抱￠ 2022-04-10 02:11 268阅读 0赞

分页插件依赖：

<dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>1.2.10</version>
            </dependency>

application.yml添加配置：

pagehelper:
      helperDialect: mysql
      reasonable: true
      supportMethodsArguments: true
      params: count=countSql

分页参数类PageRequest.java

/** * description: 分页参数 * * @author sanchar * @date 12/12/2018 19:26 * lastUpdateBy: sanchar * lastUpdateDate: 12/12/2018 */
    public class PageRequest { 
    
        private int page;
        private int size;
        private String sort;
    
        public PageRequest() { }
    
        public PageRequest(int page, int size) { 
            this(page, size, null);
        }
    
        public PageRequest(int page, int size, String sort) { 
            this.page = page;
            this.size = size;
            this.sort = sort;
        }
    
        public int getPage() { 
            return page;
        }
    
        public void setPage(int page) { 
            this.page = page;
        }
    
        public int getSize() { 
            return size;
        }
    
        public void setSize(int size) { 
            this.size = size;
        }
    
        public String getSort() { 
            return sort;
        }
    
        public void setSort(String sort) { 
            this.sort = sort;
        }
    }

查询方法function接口：

/** * description: Select * * @author sanchar * @date 12/13/2018 12:46 * lastUpdateBy: sanchar * lastUpdateDate: 12/13/2018 */
    @FunctionalInterface
    public interface Select<E> { 
        List<E> doSelect();
    }

自定义PageHelper：

**
     * description:
     *
     * @author sanchar
     * @date 12/13/2018 12:11
     * lastUpdateBy: sanchar
     * lastUpdateDate: 12/13/2018
     */
    public class PageHelper extends PageMethod { 
        public PageHelper() { 
        }
    
        public static <E> PageInfo<E> doPage(PageRequest pageRequest, Select select) { 
            startPage(pageRequest.getPage(), pageRequest.getSize());
            List<E> list = select.doSelect();
            PageInfo<E> pageInfo = new PageInfo<>(list);
            return pageInfo;
        }
    }

使用PageHelper参考（service实现层）：

@Override
        public PageInfo<Demo> pageQuery(PageRequest pageRequest, Demo demo) { 
            return PageHelper.doPage(pageRequest, () -> demoMapper.select(demo));
        }