昨天邹建大哥给了我一个分页存储过程,我想在ASP.NET里得到@Count的值,不知道怎么做啊??
以下我的代码:
SqlParameter[] parameters = new SqlParameter[5];
parameters[0] = new SqlParameter("@Source",SqlDbType.NVarChar,4000);
parameters[1] = new SqlParameter("@Size",SqlDbType.Int);
parameters[2] = new SqlParameter("@Index",SqlDbType.Int);
parameters[3] = new SqlParameter("@List",SqlDbType.NVarChar,1000);
parameters[4] = new SqlParameter("@Order",SqlDbType.NVarChar,1000);
parameters[0].Value = "V_Goods";
parameters[1].Value = 1;
parameters[2].Value = Pager.CurrentPageIndex;
parameters[3].Value = "ID,Name,GK_Name,GSK_Name,Hits";
parameters[4].Value = "ID DESC";
DataBase db = new DataBase(CommandType.StoredProcedure);
GoodsList.DataSource = db.GetDataReader("pager",parameters);
GoodsList.DataBind();
Pager.RecordCount = ;//这里怎么做????存储过程代码:
CREATE Proc pager
@Source nvarchar(4000), --表名、视图名、查询语句
@Size int=10, --每页的大小(行数)
@Index int=1, --要显示的页
@List nvarchar (1000)='', --要显示的字段列表,如果查询结果有标识字段,需要指定此值,且不包含标识字段
@Order nvarchar (1000)='', --排序字段列表
@Count int = null OUTPUT -- 输出记录数, 如果@Count为null, 则输出记录数, 否则不要输出
as
set nocount on
declare @FdName nvarchar(250) --表中的主键或表、临时表中的标识列名
,@Id1 varchar(20),@Id2 varchar(20) --开始和结束的记录号
,@Obj_ID int --对象ID
--表中有复合主键的处理
declare @strfd nvarchar(2000) --复合主键列表
,@strjoin nvarchar(4000) --连接字段
,@strwhere nvarchar(2000) --查询条件
select @Obj_ID=object_id(@Source)
,@List=case isnull(@List,'') when '' then ' *' else ' '+@List end
,@Order=case isnull(@Order,'') when '' then '' else ' order by '+@Order end
,@Source=case when @Obj_ID is not null then ' '+@Source else ' ('+@Source+') a' end--如果显示第一页,可以直接用top来完成
if @Index=1
begin
select @Id1=cast(@Size as varchar(20))
exec('select top '+@Id1+@List+' from '+@Source+@Order)
return
end--如果是表,则检查表中是否有标识更或主键
if @Obj_ID is not null and objectproperty(@Obj_ID,'IsTable')=1
begin
select @Id1=cast(@Size as varchar(20))
,@Id2=cast((@Index-1)*@Size as varchar(20)) select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
if @@rowcount=0 --如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype='PK')
goto lbusetemp --如果表中无主键,则用临时表处理 select @FdName=name from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
)))
if @@rowcount>1 --检查表中的主键是否为复合主键
begin
select @strfd='',@strjoin='',@strwhere=''
select @strfd=@strfd+',['+name+']'
,@strjoin=@strjoin+' and a.['+name+']=b.['+name+']'
,@strwhere=@strwhere+' and b.['+name+'] is null'
from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
)))
select @strfd=substring(@strfd,2,2000)
,@strjoin=substring(@strjoin,5,4000)
,@strwhere=substring(@strwhere,5,4000)
goto lbusepk
end
end
end
else
goto lbusetemp/*--使用标识列或主键为单一字段的处理方法--*/
lbuseidentity:
if @Count is null
begin
declare @lbuseidentity nvarchar(1000)
set @lbuseidentity = 'select @Count = count(*) from '+@Source
exec sp_executesql @lbuseidentity, N'@Count int out', @Count out
end
exec('select top '+@Id1+@List+' from '+@Source
+' where '+@FdName+' not in(select top '
+@Id2+' '+@FdName+' from '+@Source+@Order
+')'+@Order
)
return/*--表中有复合主键的处理方法--*/
lbusepk:
if @Count is null
begin
declare @lbusepk nvarchar(1000)
set @lbusepk = 'select @Count = count(*) from '+@Source
exec sp_executesql @lbusepk, N'@Count int out', @Count out
end exec('select '+@List+' from(select top '+@Id1+' a.* from
(select top 100 percent * from '+@Source+@Order+') a
left join (select top '+@Id2+' '+@strfd+'
from '+@Source+@Order+') b on '+@strjoin+'
where '+@strwhere+') a'
)
return/*--用临时表处理的方法--*/
lbusetemp:
select @FdName='[ID_'+cast(newid() as varchar(40))+']'
,@Id1=cast(@Size*(@Index-1) as varchar(20))
,@Id2=cast(@Size*@Index-1 as varchar(20))declare @lbusetemp nvarchar(4000)
set @lbusetemp = 'select '+@FdName+'=identity(int,0,1),'+@List+'
into #tb from'+@Source+@Order
+case when @Count is null then ' set @Count = @@rowcount ' else '' end + '
select '+@List+' from #tb where '+@FdName+' between '
+@Id1+' and '+@Id2
exec sp_executesql @lbusetemp, N'@Count int out', @Count out
GO
以下我的代码:
SqlParameter[] parameters = new SqlParameter[5];
parameters[0] = new SqlParameter("@Source",SqlDbType.NVarChar,4000);
parameters[1] = new SqlParameter("@Size",SqlDbType.Int);
parameters[2] = new SqlParameter("@Index",SqlDbType.Int);
parameters[3] = new SqlParameter("@List",SqlDbType.NVarChar,1000);
parameters[4] = new SqlParameter("@Order",SqlDbType.NVarChar,1000);
parameters[0].Value = "V_Goods";
parameters[1].Value = 1;
parameters[2].Value = Pager.CurrentPageIndex;
parameters[3].Value = "ID,Name,GK_Name,GSK_Name,Hits";
parameters[4].Value = "ID DESC";
DataBase db = new DataBase(CommandType.StoredProcedure);
GoodsList.DataSource = db.GetDataReader("pager",parameters);
GoodsList.DataBind();
Pager.RecordCount = ;//这里怎么做????存储过程代码:
CREATE Proc pager
@Source nvarchar(4000), --表名、视图名、查询语句
@Size int=10, --每页的大小(行数)
@Index int=1, --要显示的页
@List nvarchar (1000)='', --要显示的字段列表,如果查询结果有标识字段,需要指定此值,且不包含标识字段
@Order nvarchar (1000)='', --排序字段列表
@Count int = null OUTPUT -- 输出记录数, 如果@Count为null, 则输出记录数, 否则不要输出
as
set nocount on
declare @FdName nvarchar(250) --表中的主键或表、临时表中的标识列名
,@Id1 varchar(20),@Id2 varchar(20) --开始和结束的记录号
,@Obj_ID int --对象ID
--表中有复合主键的处理
declare @strfd nvarchar(2000) --复合主键列表
,@strjoin nvarchar(4000) --连接字段
,@strwhere nvarchar(2000) --查询条件
select @Obj_ID=object_id(@Source)
,@List=case isnull(@List,'') when '' then ' *' else ' '+@List end
,@Order=case isnull(@Order,'') when '' then '' else ' order by '+@Order end
,@Source=case when @Obj_ID is not null then ' '+@Source else ' ('+@Source+') a' end--如果显示第一页,可以直接用top来完成
if @Index=1
begin
select @Id1=cast(@Size as varchar(20))
exec('select top '+@Id1+@List+' from '+@Source+@Order)
return
end--如果是表,则检查表中是否有标识更或主键
if @Obj_ID is not null and objectproperty(@Obj_ID,'IsTable')=1
begin
select @Id1=cast(@Size as varchar(20))
,@Id2=cast((@Index-1)*@Size as varchar(20)) select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
if @@rowcount=0 --如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype='PK')
goto lbusetemp --如果表中无主键,则用临时表处理 select @FdName=name from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
)))
if @@rowcount>1 --检查表中的主键是否为复合主键
begin
select @strfd='',@strjoin='',@strwhere=''
select @strfd=@strfd+',['+name+']'
,@strjoin=@strjoin+' and a.['+name+']=b.['+name+']'
,@strwhere=@strwhere+' and b.['+name+'] is null'
from syscolumns where id=@Obj_ID and colid in(
select colid from sysindexkeys where @Obj_ID=id and indid in(
select indid from sysindexes where @Obj_ID=id and name in(
select name from sysobjects where xtype='PK' and parent_obj=@Obj_ID
)))
select @strfd=substring(@strfd,2,2000)
,@strjoin=substring(@strjoin,5,4000)
,@strwhere=substring(@strwhere,5,4000)
goto lbusepk
end
end
end
else
goto lbusetemp/*--使用标识列或主键为单一字段的处理方法--*/
lbuseidentity:
if @Count is null
begin
declare @lbuseidentity nvarchar(1000)
set @lbuseidentity = 'select @Count = count(*) from '+@Source
exec sp_executesql @lbuseidentity, N'@Count int out', @Count out
end
exec('select top '+@Id1+@List+' from '+@Source
+' where '+@FdName+' not in(select top '
+@Id2+' '+@FdName+' from '+@Source+@Order
+')'+@Order
)
return/*--表中有复合主键的处理方法--*/
lbusepk:
if @Count is null
begin
declare @lbusepk nvarchar(1000)
set @lbusepk = 'select @Count = count(*) from '+@Source
exec sp_executesql @lbusepk, N'@Count int out', @Count out
end exec('select '+@List+' from(select top '+@Id1+' a.* from
(select top 100 percent * from '+@Source+@Order+') a
left join (select top '+@Id2+' '+@strfd+'
from '+@Source+@Order+') b on '+@strjoin+'
where '+@strwhere+') a'
)
return/*--用临时表处理的方法--*/
lbusetemp:
select @FdName='[ID_'+cast(newid() as varchar(40))+']'
,@Id1=cast(@Size*(@Index-1) as varchar(20))
,@Id2=cast(@Size*@Index-1 as varchar(20))declare @lbusetemp nvarchar(4000)
set @lbusetemp = 'select '+@FdName+'=identity(int,0,1),'+@List+'
into #tb from'+@Source+@Order
+case when @Count is null then ' set @Count = @@rowcount ' else '' end + '
select '+@List+' from #tb where '+@FdName+' between '
+@Id1+' and '+@Id2
exec sp_executesql @lbusetemp, N'@Count int out', @Count out
GO
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parameters[0] = new SqlParameter("@Source",SqlDbType.NVarChar,4000);
parameters[1] = new SqlParameter("@Size",SqlDbType.Int);
parameters[2] = new SqlParameter("@Index",SqlDbType.Int);
parameters[3] = new SqlParameter("@List",SqlDbType.NVarChar,1000);
parameters[4] = new SqlParameter("@Order",SqlDbType.NVarChar,1000);//>>>out parameter
parameters[5] = new SqlParameter("@Count ",SqlDbType.Int);
parameters[5].Direction = ParameterDirection.Output
parameters[0].Value = "V_Goods";
parameters[1].Value = 1;
parameters[2].Value = Pager.CurrentPageIndex;
parameters[3].Value = "ID,Name,GK_Name,GSK_Name,Hits";
parameters[4].Value = "ID DESC";
DataBase db = new DataBase(CommandType.StoredProcedure);
GoodsList.DataSource = db.GetDataReader("pager",parameters);
GoodsList.DataBind();
//>>>RecordCount
Pager.RecordCount = parameters[5].Value;//这里怎么做????
错误:
@@Count 不是过程 pager 的参数。
不过删除掉一个@后,还是不对.
错误
未将对象引用设置到对象的实例。
行 58: GoodsList.DataSource = db.GetDataReader("pager",parameters);
行 59: GoodsList.DataBind();
行 60: Pager.RecordCount = (int)parameters[5].Value;
行 61: db.CloseConnection();
大家帮帮忙,顶一下.
错误:
异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。
指示这行:
行 78 Pager.RecordCount = (int)cmd.Parameters[5].Value;代码
SqlConnection conn = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["DSN"]);
SqlCommand cmd = new SqlCommand("pager",conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@Source",SqlDbType.NVarChar,4000));
cmd.Parameters[0].Value = "V_Goods";
cmd.Parameters.Add(new SqlParameter("@Size",SqlDbType.Int));
cmd.Parameters[1].Value = 1;
cmd.Parameters.Add(new SqlParameter("@Index",SqlDbType.Int));
cmd.Parameters[2].Value = Pager.CurrentPageIndex;
cmd.Parameters.Add(new SqlParameter("@List",SqlDbType.NVarChar,4000));
cmd.Parameters[3].Value = "ID,Name,GK_Name,GSK_Name,Hits";
cmd.Parameters.Add(new SqlParameter("@Order",SqlDbType.NVarChar,1000));
cmd.Parameters[4].Value = "ID DESC";
cmd.Parameters.Add(new SqlParameter("@Count",SqlDbType.Int));
cmd.Parameters[5].Direction = ParameterDirection.Output;
conn.Open();
GoodsList.DataSource = cmd.ExecuteReader();
GoodsList.DataBind();
Pager.RecordCount = (int)cmd.Parameters[5].Value;
conn.Close();
谁告诉我,为什么这样却行呢?
于是把PageIndex改为2,结果要以访问了.跟踪输出结果,显示也为正确的记录数.
于是看了一下存储过程代码,原来好象是有问题,不过T-SQL不是很强,不会改,还得请大哥帮忙.
大哥请看:
--如果显示第一页,可以直接用top来完成
if @Index=1
begin
select @Id1=cast(@Size as varchar(20))
exec('select top '+@Id1+@List+' from '+@Source+@Order)
return
end这是存储过程代码的一部分,如果是显示第一页,那么RecordCount不就没有计算吗?难怪我怎么调试都出错喔...???!!!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~着能不错?你什么地方定义了第5个参数?另外,记得要给输出参数的ParameterDirection设置为OUTPUT
cmd.Parameters.Add(new SqlParameter("@Count",SqlDbType.Int));
cmd.Parameters[5].Direction = ParameterDirection.Output;谢谢你的回答,我想我找到问题所在了,应该在存储过程里.
存储过程中,处理显示第一页的代码好象没有给输出参数赋值.所以在使用的时候出错.
if @Index=1
begin
if @Count is null
begin
declare @lbtop1 nvarchar(1000)
set @lbtop1 = 'select @Count = count(*) from '+@Source
exec sp_executesql @lbtop1, N'@Count int out', @Count out
end
select @Id1=cast(@Size as varchar(20))
exec('select top '+@Id1+@List+' from '+@Source+@Order)
return
end