真正的分页存储过程,借鉴了CSDN上众多力量,除BUG版

前段时间研究分页的时候,在CSDN的BLOG上看到了一位兄弟写的分页存储过程,发现非常好,于是,就使用了这个存储过程,下面是原版的分页存储过程


--开始


CREATE PROCEDURE GetRecordFromPage


@tblName varchar(255), -- 表名


@fldName varchar(255), -- 字段名


@PageSize int = 10, -- 页尺寸


@PageIndex int = 1, -- 页码


@IsCount bit = 0, -- 返回记录总数, 非 0 值则返回


@OrderType bit = 0, -- 设置排序类型, 非 0 值则降序


@strWhere varchar(1000) = '' -- 查询条件 (注意: 不要加 where)


AS




declare @strSQL varchar(1000) -- 主语句


declare @strTmp varchar(300) -- 临时变量


declare @strOrder varchar(400) -- 排序类型




if @OrderType != 0


begin


set @strTmp = "<(select min"


set @strOrder = " order by [" + @fldName +"] desc"


end


else


begin


set @strTmp = ">(select max"


set @strOrder = " order by [" + @fldName +"] asc"


end




set @strSQL = "select top " + str(@PageSize) + " * from ["


+ @tblName + "] where [" + @fldName + "]" + @strTmp + "(["


+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["


+ @fldName + "] from [" + @tblName + "]" + @strOrder + ") as tblTmp)"


+ @strOrder




if @strWhere != ''


set @strSQL = "select top " + str(@PageSize) + " * from ["


+ @tblName + "] where [" + @fldName + "]" + @strTmp + "(["


+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["


+ @fldName + "] from [" + @tblName + "] where " + @strWhere + " "


+ @strOrder + ") as tblTmp) and " + @strWhere + " " + @strOrder




if @PageIndex = 1


begin


set @strTmp = ""


if @strWhere != ''


set @strTmp = " where " + @strWhere




set @strSQL = "select top " + str(@PageSize) + " * from ["


+ @tblName + "]" + @strTmp + " " + @strOrder


end




if @IsCount != 0


set @strSQL = "select count(*) as Total from [" + @tblName + "]"




exec (@strSQL)


GO


--结束



当我在用这个存储过程的时候,刚开始没有发现问题,后来当我的条件很复杂的时候,发现,此存储过程执行遇到错误,下面是出现问题的条件
id<>0 and (companyenname like '%shenzhen%' or companychname like '%shenzhen%' or web like '%shenzhen%' or memo like '%shenzhen%' or address like '%shenzhen%') order by [id] desc) as tblTmp) and id<>0 and (companyenname like '%shenzhen%' or companychname like '%shenzhen%' or web like '%shenzhen%' or memo like '%shenzhen%' or address like '%shenzhen%') and salesid=9
照说这个条件是没有问题的,可是,用上面的存储过程执行,却老是报告错误
后来,经调试,输出生成后的SQL语句,发现,原来问题是出现在嵌套的SQL语句中使用的()身上,于是,我把存储过程改为下面的效果,终于排除了BUG,下面的存储过程不管你的条件有多复杂,只要格式正确,就能运行
CREATE PROCEDURE GetRecordFromPage
@tblName varchar(255), -- 表名
@fldName varchar(255), -- 字段名
@PageSize int = 10, -- 页尺寸
@PageIndex int = 1, -- 页码
@IsCount bit = 0, -- 返回记录总数, 非 0 值则返回
@OrderType bit = 0, -- 设置排序类型, 非 0 值则降序
@strWhere varchar(1000) = '' -- 查询条件 (注意: 不要加 where)
AS

declare @strSQL varchar(1000) -- 主语句
declare @strTmp varchar(300) -- 临时变量
declare @strOrder varchar(400) -- 排序类型

if @OrderType != 0
begin
set @strTmp = "<(select min"
set @strOrder = " order by [" + @fldName +"] desc"
end
else
begin
set @strTmp = ">(select max"
set @strOrder = " order by [" + @fldName +"] asc"
end

set @strSQL = "select top " + str(@PageSize) + " * from ["
+ @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
+ @fldName + "] from [" + @tblName + "]" + @strOrder + ") as tblTmp)"
+ @strOrder

if @strWhere != ''
set @strSQL = "select top " + str(@PageSize) + " * from ["
+ @tblName + "] where [" + @fldName + "]" + @strTmp + "(["
+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["
+ @fldName + "] from [" + @tblName + "] where (" + @strWhere + ") "
+ @strOrder + ") as tblTmp) and (" + @strWhere + ") " + @strOrder

if @PageIndex = 1
begin
set @strTmp = ""
if @strWhere != ''
set @strTmp = " where (" + @strWhere + ")"

set @strSQL = "select top " + str(@PageSize) + " * from ["
+ @tblName + "]" + @strTmp + " " + @strOrder
end

if @IsCount != 0
set @strSQL = "select count(*) as Total from [" + @tblName + "]"

exec (@strSQL)
GO

要注意看,修改后的存储过程在使用@strWhere时,都在其前后加上了(),这样,就防止嵌套的()出现错误

下面的代码是引用该存储过程的一个范例

SqlConnection MyConnection=new SqlConnection(ConfigurationSettings.AppSettings["dsn"]);
DataSet MyDataSet=new DataSet();




string strKeyword=Keyword.Text.Trim().Replace("'","''");


string strSalesId=Sales.SelectedItem.Value;


int RecordCount=CalcRecordCount();


RecordNumber.Text=RecordCount.ToString();


LblRecordNumber.Text=RecordCount.ToString();


string strExpress="Id<>0";


if (strKeyword!="")


strExpress=strExpress+" and (companyenname like '%"+strKeyword+"%' or companychname like '%"+strKeyword+"%' or Companyshortname like '%"+strKeyword+"%' or web like '%"+strKeyword+"%' or mainproduct like '%"+strKeyword+"%' or phone like '%"+strKeyword+"%' or memo like '%"+strKeyword+"%' or address like '%"+strKeyword+"%' or linkmanphone like '%"+strKeyword+"%')";


if (strSalesId!="")


strExpress=strExpress+" and salesid="+strSalesId;


SqlCommand MyCommand=new SqlCommand();


MyCommand.Connection=MyConnection;


MyCommand.CommandText="GetRecordFromPage";


MyCommand.CommandType=CommandType.StoredProcedure;


MyCommand.Parameters.Add("@tblName","customerview");


MyCommand.Parameters.Add("@fldName","id");


MyCommand.Parameters.Add("@strWhere",strExpress);


MyCommand.Parameters.Add("@PageSize",Int32.Parse(CustomerList.PageSize.ToString()));


MyCommand.Parameters.Add("@PageIndex",Int32.Parse(ViewState["PageIndex"].ToString())+1);


SqlDataReader MyReader;


MyConnection.Open();


MyReader=MyCommand.ExecuteReader();


CustomerList.VirtualItemCount=RecordCount;


CustomerList.DataSource=MyReader;


CustomerList.DataKeyField="id";


CustomerList.DataBind();


MyReader.Close();


MyConnection.Close();




在这里,要注意的是存储过程使用的PAGEINDEX变量是从1开始




最后,再排除一个BUG


将存储过程中


declare @strSQL varchar(1000) -- 主语句


declare @strTmp varchar(300) -- 临时变量


declare @strOrder varchar(400) -- 排序类型


改为


declare @strSQL varchar(2000) -- 主语句


declare @strTmp varchar(1000) -- 临时变量


declare @strOrder varchar(1000) -- 排序类型







因为我在调试中发现有些查询用的语句选不止300
最后,只要将以上存储过程代码复制并加入到你的数据库中,再按照范例来调用即可了