这篇文章主要讲解了“mssql access数据库利用top分页的方法”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“mssql access数据库利用top分页的方法”吧！
察隅网站制作公司哪家好，找创新互联！从网页设计、网站建设、微信开发、APP开发、
成都响应式网站建设等网站项目制作，到程序开发，运营维护。创新互联从2013年创立到现在10年的时间，我们拥有了丰富的建站经验和运维经验，来保证我们的工作的顺利进行。专注于网站建设就选创新互联。
复制代码 代码如下:
uusing system.collections.generic;sing system;using system.text;/// /// 构造分页后的sql语句/// public static class paginghelper{ /// /// 获取分页sql语句，排序字段需要构成记录 /// /// 记录总数 /// 每页记录数 /// 当前页数 /// sql查询语句 /// 排序字段，多个则用“,”隔开 /// 分页sql语句 public static string createpagingsql(int _recordcount, int _pagesize, int _pageindex, string _safesql, string _orderfield) { //重新组合排序字段，防止有错误 string[] arrstrorders = _orderfield.split(new char[] { ',' }, stringsplitoptions.removeemptyentries); stringbuilder sboriginalorder = new stringbuilder(); //原排序字段 stringbuilder sbreverseo教程rder = new stringbuilder(); //与原排序字段相反，用于分页 for (int i = 0; i < arrstrorders.length; i++) { arrstrorders[i] = arrstrorders[i].trim(); //去除前后空格 if (i != 0) { sboriginalorder.append(", "); sbreverseorder.append(", "); } sboriginalorder.append(arrstrorders[i]);
int index = arrstrorders[i].indexof(" "); //判断是否有升降标识 if (index > 0) { //替换升降标识，分页所需 bool flag = arrstrorders[i].indexof(" desc", stringcomparison.ordinalignorecase) != -1; sbreverseorder.appendformat("{0} {1}", arrstrorders[i].remove(index), flag ? "asc" : "desc"); } else { sbreverseorder.appendformat("{0} desc", arrstrorders[i]); } }
//计算总页数 _pagesize = _pagesize == 0 ? _recordcount : _pagesize; int pagecount = (_recordcount + _pagesize - 1) / _pagesize;
//检查当前页数 if (_pageindex < 1) { _pageindex = 1; } else if (_pageindex > pagecount) { _pageindex = pagecount; }
stringbuilder sbsql = new stringbuilder(); //第一页时，直接使用top n，而不进行分页查询 if (_pageindex == 1) { sbsql.appendformat(" select top {0} * ", _pagesize); sbsql.appendformat(" from ({0}) as t ", _safesql); sbsql.appendformat(" order by {0} ", sboriginalorder.tostring()); } //最后一页时，减少一个top n else if (_pageindex == pagecount) { sbsql.append(" select * from "); sbsql.append(" ( "); sbsql.appendformat(" select top {0} * ", _recordcount - _pagesize * (_pageindex - 1)); sbsql.appendformat(" from ({0}) as t ", _safesql); sbsql.appendformat(" order by {0} ", sbreverseorder.tostring()); sbsql.append(" ) as t "); sbsql.appendformat(" order by {0} ", sboriginalorder.tostring()); } //前半页数时的分页 else if (_pageindex < (pagecount / 2 + pagecount % 2)) { sbsql.append(" select * from "); sbsql.append(" ( "); sbsql.appendformat(" select top {0} * from ", _pagesize); sbsql.append(" ( "); sbsql.appendformat(" select top {0} * ", _pagesize * _pageindex); sbsql.appendformat(" from ({0}) as t ", _safesql); sbsql.appendformat(" order by {0} ", sboriginalorder.tostring()); sbsql.append(" ) as t "); sbsql.appendformat(" order by {0} ", sbreverseorder.tostring()); sbsql.append(" ) as t "); sbsql.appendformat(" order by {0} ", sboriginalorder.tostring()); } //后半页数时的分页 else { sbsql.appendformat(" select top {0} * from ", _pagesize); sbsql.append(" ( "); sbsql.appendformat(" select top {0} * ", ((_recordcount % _pagesize) + _pagesize * (pagecount - _pageindex))); sbsql.appendformat(" from ({0}) as t ", _safesql); sbsql.appendformat(" order by {0} ", sbreverseorder.tostring()); sbsql.append(" ) as t "); sbsql.appendformat(" order by {0} ", sboriginalorder.tostring()); }
return sbsql.tostring(); }
/// /// 获取记录总数sql语句 /// /// 限定记录数 /// sql查询语句 /// 记录总数sql语句 public static string createtopnsql(int _n, string _safesql) { return string.format(" select top {0} * from ({1}) as t ", _n, _safesql); }
/// /// 获取记录总数sql语句 /// /// sql查询语句 /// 记录总数sql语句 public static string createcountingsql(string _safesql) { return string.format(" select count(1) as recordcount from ({0}) as t ", _safesql); }}
感谢各位的阅读，以上就是“mssql access数据库利用top分页的方法”的内容了，经过本文的学习后，相信大家对mssql access数据库利用top分页的方法这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是创新互联网站建设公司，，小编将为大家推送更多相关知识点的文章，欢迎关注！
分享名称：mssqlaccess数据库利用top分页的方法-创新互联
分享地址：
http://kswjz.com/article/dedphe.html
