无为清净楼资源网 Design By www.qnjia.com
分享一下两种方式的分页代码
1.用DataReader分页
复制代码 代码如下:
/// <summary>
/// PageList for DataReader
/// </summary>
/// <param name="connectionString"></param>
/// <param name="sql"></param>
/// <param name="pageSize"></param>
/// <param name="curPage"></param>
/// <param name="pageCount"></param>
/// <param name="count"></param>
/// <param name="cmdParms"></param>
/// <returns></returns>
public DataTable PageListReader(string connectionString, string sql, int pageSize, int curPage, out int pageCount, out int count, params DbParameter[] cmdParms)
{
int first = 0;
int last = 0;
int fieldCount = 0;
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = conn.CreateCommand();
PrepareCommand(cmd, conn, null, CommandType.Text, sql, cmdParms);
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataTable dt = new DataTable();
fieldCount = reader.FieldCount;
for (int i = 0; i < fieldCount; i++)
{
DataColumn col = new DataColumn();
col.ColumnName = reader.GetName(i);
col.DataType = reader.GetFieldType(i);
dt.Columns.Add(col);
}
count = 0;
first = (curPage - 1) * pageSize+1;
last = curPage * pageSize;
while (reader.Read())
{
count++;
if (count >= first && last >= count)
{
DataRow r = dt.NewRow();
for (int i = 0; i < fieldCount; i++)
{
r[i] = reader[i];
}
dt.Rows.Add(r);
}
}
reader.Close();
pageCount = Convert.ToInt32(Math.Ceiling((double)count / (double)pageSize));
return dt;
}
}
2.用ROW_NUMBER()分页
复制代码 代码如下:
/// <summary>
/// 分页获取数据(Sql Server 2005) for ROW_NUMBER()
/// </summary>
/// <param name="connectionString">数据库链接</param>
/// <param name="sql">获取数据集的Sql</param>
/// <param name="fldSort">排序字段,可以多个</param>
/// <param name="pageSize">每页显示多少条</param>
/// <param name="curPage">当前页码</param>
/// <param name="pageCount">总页数</param>
/// <param name="count">总记录数</param>
///<param name="cmdParms">DbParameter</param>
/// <returns>DataTable</returns>
public DataTable PageList(string connectionString, string sql, string fldSort, int pageSize, int curPage, out int pageCount, out int count, params DbParameter[] cmdParms)
{
StringBuilder strSql = new StringBuilder();
strSql.AppendFormat(@"SELECT count(0) from {0} as MyTableCount;
select * from (
SELECT ROW_NUMBER() OVER(order by {1}) RowNumber,*
from {0} mytable
) mytable2
where RowNumber between {2} and {3}"
, sql, fldSort, Convert.ToString((curPage - 1) * pageSize + 1), Convert.ToString((curPage * pageSize)));
DataSet ds = ExecuteQuery(connectionString, CommandType.Text, strSql.ToString(), cmdParms);
count = Convert.ToInt32(ds.Tables[0].Rows[0][0]);
pageCount = Convert.ToInt32(Math.Ceiling((double)count / (double)pageSize));
return ds.Tables[1];
}
1.用DataReader分页
复制代码 代码如下:
/// <summary>
/// PageList for DataReader
/// </summary>
/// <param name="connectionString"></param>
/// <param name="sql"></param>
/// <param name="pageSize"></param>
/// <param name="curPage"></param>
/// <param name="pageCount"></param>
/// <param name="count"></param>
/// <param name="cmdParms"></param>
/// <returns></returns>
public DataTable PageListReader(string connectionString, string sql, int pageSize, int curPage, out int pageCount, out int count, params DbParameter[] cmdParms)
{
int first = 0;
int last = 0;
int fieldCount = 0;
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = conn.CreateCommand();
PrepareCommand(cmd, conn, null, CommandType.Text, sql, cmdParms);
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataTable dt = new DataTable();
fieldCount = reader.FieldCount;
for (int i = 0; i < fieldCount; i++)
{
DataColumn col = new DataColumn();
col.ColumnName = reader.GetName(i);
col.DataType = reader.GetFieldType(i);
dt.Columns.Add(col);
}
count = 0;
first = (curPage - 1) * pageSize+1;
last = curPage * pageSize;
while (reader.Read())
{
count++;
if (count >= first && last >= count)
{
DataRow r = dt.NewRow();
for (int i = 0; i < fieldCount; i++)
{
r[i] = reader[i];
}
dt.Rows.Add(r);
}
}
reader.Close();
pageCount = Convert.ToInt32(Math.Ceiling((double)count / (double)pageSize));
return dt;
}
}
2.用ROW_NUMBER()分页
复制代码 代码如下:
/// <summary>
/// 分页获取数据(Sql Server 2005) for ROW_NUMBER()
/// </summary>
/// <param name="connectionString">数据库链接</param>
/// <param name="sql">获取数据集的Sql</param>
/// <param name="fldSort">排序字段,可以多个</param>
/// <param name="pageSize">每页显示多少条</param>
/// <param name="curPage">当前页码</param>
/// <param name="pageCount">总页数</param>
/// <param name="count">总记录数</param>
///<param name="cmdParms">DbParameter</param>
/// <returns>DataTable</returns>
public DataTable PageList(string connectionString, string sql, string fldSort, int pageSize, int curPage, out int pageCount, out int count, params DbParameter[] cmdParms)
{
StringBuilder strSql = new StringBuilder();
strSql.AppendFormat(@"SELECT count(0) from {0} as MyTableCount;
select * from (
SELECT ROW_NUMBER() OVER(order by {1}) RowNumber,*
from {0} mytable
) mytable2
where RowNumber between {2} and {3}"
, sql, fldSort, Convert.ToString((curPage - 1) * pageSize + 1), Convert.ToString((curPage * pageSize)));
DataSet ds = ExecuteQuery(connectionString, CommandType.Text, strSql.ToString(), cmdParms);
count = Convert.ToInt32(ds.Tables[0].Rows[0][0]);
pageCount = Convert.ToInt32(Math.Ceiling((double)count / (double)pageSize));
return ds.Tables[1];
}
标签:
DataReader,高效率分页
无为清净楼资源网 Design By www.qnjia.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
无为清净楼资源网 Design By www.qnjia.com
暂无评论...
P70系列延期,华为新旗舰将在下月发布
3月20日消息,近期博主@数码闲聊站 透露,原定三月份发布的华为新旗舰P70系列延期发布,预计4月份上市。
而博主@定焦数码 爆料,华为的P70系列在定位上已经超过了Mate60,成为了重要的旗舰系列之一。它肩负着重返影像领域顶尖的使命。那么这次P70会带来哪些令人惊艳的创新呢?
根据目前爆料的消息来看,华为P70系列将推出三个版本,其中P70和P70 Pro采用了三角形的摄像头模组设计,而P70 Art则采用了与上一代P60 Art相似的不规则形状设计。这样的外观是否好看见仁见智,但辨识度绝对拉满。
更新日志
2024年09月26日
2024年09月26日
- 纯音入心系列纯音乐《中央民族乐团-古筝传奇》1CD[MP3][253.1MB]
- 江玲.1989-这样你才爱我,是吗?【新作有声】【WAV+CUE】
- 郭美美.2010-我是郭美美【华纳】【WAV+CUE】
- 黄心懋1991-轻忧郁【滚石】【WAV+CUE】
- 群星.2000-大地金曲世纪回顾2CD【大地】【WAV+CUE】
- 王菲.1996-浮躁(2024环球MQA-UHQCD限量版)【环球】【WAV+CUE】
- 群星.2022-传家电视剧原声带【东阳欢娱】【FLAC分轨】
- 《摇滚教父 伍佰黄金精选 2CD》 [WAV+CUE][1GB]
- 《凤凰传奇 我从草原来》[WAV/分轨][400MB]
- 《叶倩文 真心真意过一生》[WAV+CUE][400MB]
- 潘越云.1985-世间女子(滚石25周年经典复刻版)【滚石】【WAV+CUE】
- 陈柏宇.2009-CANT.BE.HALF【SONY】【WAV+CUE】
- 李明依.1989-小女生【滚石】【WAV+CUE】
- 《李荣浩 新时代创作新人王》[WAV分轨][310MB]
- 《黑鸭子与马头琴 史上最动听草原音乐》[WAV+CUE][320MB]