1 ,service 层代码实现
Integer start = (pageNum - 1) * pageSize;
Integer end = pageSize;
List<entity> entityList;
//调用mapper查询数据库
entityList = entityPOMapper.query(start, end);
SimplePageInfo simplePageInfo = SimplePageInfo.of(entityList );
simplePageInfo.setNumber(pageNum);
simplePageInfo.setPageSize(pageSize);
// 查询出来数据等于size,总数据量加一，页数加一
if (entityList .size() == pageSize) {
Integer totalElements = (pageNum * pageSize) + 1;
Integer pages = pageNum + 1;
simplePageInfo.setTotalElements(totalElements);
simplePageInfo.setPages(pages);
} else {
//数据不够size
Integer totalElements = ((pageNum - 1) * pageSize + entityList .size());
Integer pages = pageNum;
simplePageInfo.setTotalElements(totalElements);
simplePageInfo.setPages(pages);
}
return simplePageInfo;
}
2,mapper
<select .............>
select..
from ...
where ...
LIMIT #{start}, #{end}
</select>
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