2分法-通用存储过程分页(top max模式)版本_MySQL

–/*—–存储过程 分页处理 孙伟 2005-03-28创建 ——-*/
–/*—– 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 ——-*/
–/*—–存储过程 分页处理 孙伟 2005-04-21修改 添加Distinct查询功能——-*/
–/*—–存储过程 分页处理 孙伟 2005-05-18修改 多字段排序规则问题——-*/
–/*—–存储过程 分页处理 孙伟 2005-06-15修改 多字段排序修改——-*/
–/*—–存储过程 分页处理 孙伟 2005-12-13修改 修改数据分页方式为top max模式 性能有极大提高——-*/
–/*—–缺点：相对之前的not in版本主键只能是整型字段,如主键为GUID类型请使用not in 模式的版本——-*/
CREATE PROCEDURE dbo.proc_ListPageInt
(
@tblName nvarchar(200), —-要显示的表或多个表的连接
@fldName nvarchar(500) = ‘*’, —-要显示的字段列表
@pageSize int = 10, —-每页显示的记录个数
@page int = 1, —-要显示那一页的记录
@pageCount int = 1 output, —-查询结果分页后的总页数
@Counts int = 1 output, —-查询到的记录数
@fldSort nvarchar(200) = null, —-排序字段列表或条件
@Sort bit = 0, —-排序方法，0为升序，1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)–程序传参如：’ SortA Asc,SortB Desc,SortC ‘)
@strCondition nvarchar(1000) = null, —-查询条件,不需where
@ID nvarchar(150), —-主表的主键
@Dist bit = 0 —-是否添加查询字段的 DISTINCT 默认0不添加/1添加
)
AS
SET NOCOUNT ON
Declare @sqlTmp nvarchar(1000) —-存放动态生成的SQL语句
Declare @strTmp nvarchar(1000) —-存放取得查询结果总数的查询语句
Declare @strID nvarchar(1000) —-存放取得查询开头或结尾ID的查询语句

Declare @strSortType nvarchar(10) —-数据排序规则A
Declare @strFSortType nvarchar(10) —-数据排序规则B

Declare @SqlSelect nvarchar(50) —-对含有DISTINCT的查询进行SQL构造
Declare @SqlCounts nvarchar(50) —-对含有DISTINCT的总数查询进行SQL构造

if @Dist = 0
begin
set @SqlSelect = ‘select ‘
set @SqlCounts = ‘Count(*)’
end
else
begin
set @SqlSelect = ‘select distinct ‘
set @SqlCounts = ‘Count(DISTINCT ‘ @ID ‘)’
end

if @Sort=0
begin
set @strFSortType=’ ASC ‘
set @strSortType=’ DESC ‘
end
else
begin
set @strFSortType=’ DESC ‘
set @strSortType=’ ASC ‘
end

——–生成查询语句——–
–此处@strTmp为取得查询结果数量的语句
if @strCondition is null or @strCondition=” –没有设置显示条件
begin
set @sqlTmp = @fldName ‘ From ‘ @tblName
set @strTmp = @SqlSelect ‘ @Counts=’ @SqlCounts ‘ FROM ‘ @tblName
set @strID = ‘ From ‘ @tblName
end
else
begin
set @sqlTmp = @fldName ‘From ‘ @tblName ‘ where (1>0) ‘ @strCondition
set @strTmp = @SqlSelect ‘ @Counts=’ @SqlCounts ‘ FROM ‘ @tblName ‘ where (1>0) ‘ @strCondition
set @strID = ‘ From ‘ @tblName ‘ where (1>0) ‘ @strCondition
end

—-取得查询结果总数量—–
exec sp_executesql @strTmp,N’@Counts int out ‘,@Counts out
declare @tmpCounts int
if @Counts = 0
set @tmpCounts = 1
else
set @tmpCounts = @Counts

–取得分页总数
set @pageCount=(@tmpCounts @pageSize-1)/@pageSize

/**//**当前页大于总页数 取最后一页**/
if @page>@pageCount
set @page=@pageCount

–/*—–数据分页2分处理——-*/
declare @pageIndex int –总数/页大小
declare @lastcount int –总数%页大小

set @pageIndex = @tmpCounts/@pageSize
set @lastcount = @tmpCounts%@pageSize
if @lastcount > 0
set @pageIndex = @pageIndex 1
else
set @lastcount = @pagesize

–//***显示分页
if @strCondition is null or @strCondition=” –没有设置显示条件
begin
if @pageIndex<2 or @page<=@pageIndex / 2 @pageIndex % 2 –前半部分数据处理
begin
if @page=1
set @strTmp=@SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ order by ‘ @fldSort ‘ ‘ @strFSortType
else
begin
set @strTmp=@SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where ‘ @ID ‘ <(select min(' @ID ') from (' @SqlSelect ' top ' CAST(@pageSize*(@page-1) as Varchar(20)) ' ' @ID ' from ' @tblName
‘ order by ‘ @fldSort ‘ ‘ @strFSortType ‘) AS TBMinID)’
‘ order by ‘ @fldSort ‘ ‘ @strFSortType
end
end
else
begin
set @page = @pageIndex-@page 1 –后半部分数据处理
if @page <= 1 –最后一页数据显示
set @strTmp=@SqlSelect ‘ * from (‘ @SqlSelect ‘ top ‘ CAST(@lastcount as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TempTB’ ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
else
set @strTmp=@SqlSelect ‘ * from (‘ @SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where ‘ @ID ‘ >(select max(‘ @ID ‘) from(‘ @SqlSelect ‘ top ‘ CAST(@pageSize*(@page-2) @lastcount as Varchar(20)) ‘ ‘ @ID ‘ from ‘ @tblName
‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TBMaxID)’
‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TempTB’ ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
end
end

else –有查询条件
begin
if @pageIndex<2 or @page<=@pageIndex / 2 @pageIndex % 2 –前半部分数据处理
begin
if @page=1
set @strTmp=@SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where 1=1 ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
else
begin 本文来源gaodai#ma#com搞*代#码9网#
set @strTmp=@SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where ‘ @ID ‘ <(select min(' @ID ') from (' @SqlSelect ' top ' CAST(@pageSize*(@page-1) as Varchar(20)) ' ' @ID ' from ' @tblName
‘ where (1=1) ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strFSortType ‘) AS TBMinID)’
‘ ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
end
end
else
begin
set @page = @pageIndex-@page 1 –后半部分数据处理
if @page <= 1 –最后一页数据显示
set @strTmp=@SqlSelect ‘ * from (‘ @SqlSelect ‘ top ‘ CAST(@lastcount as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where (1=1) ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TempTB’ ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
else
set @strTmp=@SqlSelect ‘ * from (‘ @SqlSelect ‘ top ‘ CAST(@pageSize as VARCHAR(4)) ‘ ‘ @fldName ‘ from ‘ @tblName
‘ where ‘ @ID ‘ >(select max(‘ @ID ‘) from(‘ @SqlSelect ‘ top ‘ CAST(@pageSize*(@page-2) @lastcount as Varchar(20)) ‘ ‘ @ID ‘ from ‘ @tblName
‘ where (1=1) ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TBMaxID)’
‘ ‘ @strCondition ‘ order by ‘ @fldSort ‘ ‘ @strSortType ‘) AS TempTB’ ‘ order by ‘ @fldSort ‘ ‘ @strFSortType
end
end

——返回查询结果—–
exec sp_executesql @strTmp
–print @strTmp
SET NOCOUNT OFF
GO
调用方法列子：
/**////

/// SqlCommand对象
/// 查询的表/表联合
/// 要查询的字段名
/// 每页数据大小
/// 当前第几页
/// 排序字段
/// 排序顺序0降序1升序
/// 过滤条件
/// 主表主键
/// 返回的SqlDataReader ref
public static void CutPageData(SqlConnection conn, ref SqlCommand comm, string _tblName, string _fldName, int _pageSize, int _page, string _fldSort, int _Sort, string _strCondition, string _ID, ref SqlDataReader _dr)
{
//注意：在函数调用外部打开和关闭连接，以及关闭数据读取器
//comm = new SqlCommand(“proc_ListPage”,conn);
//comm.CommandType = CommandType.StoredProcedure;
comm.Parameters.Add(“@tblName”, SqlDbType.NVarChar, 200);
comm.Parameters[“@tblName”].Value = _tblName;
comm.Parameters.Add(“@fldName”, SqlDbType.NVarChar, 500);
comm.Parameters[“@fldName”].Value = _fldName;
comm.Parameters.Add(“@pageSize”, SqlDbType.Int);
comm.Parameters[“@pageSize”].Value = _pageSize;
comm.Parameters.Add(“@page”, SqlDbType.Int);
comm.Parameters[“@page”].Value = _page;
comm.Parameters.Add(“@fldSort”, SqlDbType.NVarChar, 200);
comm.Parameters[“@fldSort”].Value = _fldSort;
comm.Parameters.Add(“@Sort”, SqlDbType.Bit);
comm.Parameters[“@Sort”].Value = _Sort;
comm.Parameters.Add(“@strCondition”, SqlDbType.NVarChar, 1000);
comm.Parameters[“@strCondition”].Value = _strCondition;
comm.Parameters.Add(“@ID”, SqlDbType.NVarChar, 150);
comm.Parameters[“@ID”].Value = _ID;
comm.Parameters.Add(“@Counts”, SqlDbType.Int, 0);
comm.Parameters[“@Counts”].Direction = ParameterDirection.Output;
comm.Parameters.Add(“@pageCount”, SqlDbType.Int, 0);
comm.Parameters[“@pageCount”].Direction = ParameterDirection.Output;

_dr = comm.ExecuteReader();
}
调用例如：
CutPageData(conn, ref comm, “VOX_CDSinger”, “id, cdsinger, cdsingertype, area, cdsingerreadme”, 15, page, “id”, 1, strFilter, “id”, ref dr);
对应说明：
CutPageData(数据连接对象, ref Sqlcommand对象, “需要表或视图名称”, “要查询的字段”, 每页读取数据条数, 当前页, “排序字段可多字段如(addtime desc, visitcounts注意这里最后一个字段不加desc或asc 最后一个字段对应于后面的排序规则)”, 排序方式(1 desc 0 asc), where条件（这里不再添加where条件添加如：’ and visitcounts>100’）, 表主键, ref 返回的SqlDataReader对象);

这里的调用同样适用于之前的not in版本.

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