asp.net|存储过程|分页
在这里,感谢所有CSDN BLOG上贴过相关主题贴子的兄弟,下面的方法是建立在CSDN BLOG上七篇关于分页存储过程的基础上的
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
回复人: heroman1979(网络虫子) ( ) 信誉:96 2004-8-19 18:24:44 得分: 0
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