if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[HB_GetBooksForPage]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[HB_GetBooksForPage]
GO
------------------------------------
--用途:得到指定分类的某页的数据
--项目名称:DownKe
--说明:
--时间:2009-4-23 23:34:47
------------------------------------
CREATE PROCEDURE [dbo].HB_GetBooksForPage
@Count VARCHAR(10) output,
@TableNames VARCHAR(200), --表名,可以是多个表,但不能用别名
@PrimaryKey VARCHAR(100), --主键,可以为空,但@Order为空时该值不能为空
@Fields VARCHAR(200), --要取出的字段,可以是多个表的字段,可以为空,为空表示select *
@PageSize INT, --每页记录数
@CurrentPage INT, --当前页,0表示第1页
@Filter VARCHAR(200) = '', --条件,可以为空,不用填 where
@Group VARCHAR(200) = '', --分组依据,可以为空,不用填 group by
@Order VARCHAR(200) = '' --排序,可以为空,为空默认按主键升序排列,不用填 order by
AS
BEGIN
DECLARE @SortColumn VARCHAR(200)
DECLARE @Operator CHAR(2)
DECLARE @SortTable VARCHAR(200)
DECLARE @SortName VARCHAR(200)
IF @Fields = ''
SET @Fields = '*'
IF @Filter = ''
SET @Filter = 'WHERE 1=1'
ELSE
SET @Filter = 'WHERE ' + @Filter
IF @Group <>''
SET @Group = 'GROUP BY ' + @Group
IF @Order <> ''
BEGIN
DECLARE @pos1 INT, @pos2 INT
SET @Order = REPLACE(REPLACE(@Order, ' asc', ' ASC'), ' desc', ' DESC')
IF CHARINDEX(' DESC', @Order) > 0
IF CHARINDEX(' ASC', @Order) > 0
BEGIN
IF CHARINDEX(' DESC', @Order) < CHARINDEX(' ASC', @Order)
SET @Operator = '<='
ELSE
SET @Operator = '>='
END
ELSE
SET @Operator = '<='
ELSE
SET @Operator = '>='
SET @SortColumn = REPLACE(REPLACE(REPLACE(@Order, ' ASC', ''), ' DESC', ''), ' ', '')
SET @pos1 = CHARINDEX(',', @SortColumn)
IF @pos1 > 0
SET @SortColumn = SUBSTRING(@SortColumn, 1, @pos1-1)
SET @pos2 = CHARINDEX('.', @SortColumn)
IF @pos2 > 0
BEGIN
SET @SortTable = SUBSTRING(@SortColumn, 1, @pos2-1)
IF @pos1 > 0
SET @SortName = SUBSTRING(@SortColumn, @pos2+1, @pos1-@pos2-1)
ELSE
SET @SortName = SUBSTRING(@SortColumn, @pos2+1, LEN(@SortColumn)-@pos2)
END
ELSE
BEGIN
SET @SortTable = @TableNames
SET @SortName = @SortColumn
END
END
ELSE
BEGIN
SET @SortColumn = @PrimaryKey
SET @SortTable = @TableNames
SET @SortName = @SortColumn
SET @Order = @SortColumn
SET @Operator = '>='
END
DECLARE @type varchar(50)
DECLARE @prec int
SELECT @type=t.name, @prec=c.prec
FROM sysobjects o
JOIN syscolumns c on o.id=c.id
JOIN systypes t on c.xusertype=t.xusertype
WHERE o.name = @SortTable AND c.name = @SortName
IF CHARINDEX('char', @type) > 0
SET @type = @type + '(' + CAST(@prec AS varchar) + ')'
DECLARE @TopRows INT
SET @TopRows = @PageSize * @CurrentPage + 1
print @TopRows
print @Operator
EXEC('
DECLARE @SortColumnBegin ' + @type + '
SET ROWCOUNT ' + @TopRows + '
SELECT @SortColumnBegin=' + @SortColumn + ' FROM ' + @TableNames + ' ' + @Filter + ' ' + @Group + ' ORDER BY ' + @Order + '
SET ROWCOUNT ' + @PageSize + '
SELECT ' + @Fields + ' FROM ' + @TableNames + ' ' + @Filter + ' AND ' + @SortColumn + '' + @Operator + '@SortColumnBegin ' + @Group + ' ORDER BY ' + @Order + '
')
exec('select * from '+@TableNames + ' ' + @Filter)
set @Count=@@rowcount
END
GO
下面是基于sqlhelper的方法: public SqlDataReader GetBookInPages(string tableNames,string primaryKey,string fields,int pageIndex, int pageSize, string filter,string group,string order)
{
SqlParameter[] parameters = {
new SqlParameter("@Count",SqlDbType.Char,10),
new SqlParameter("@TableNames",SqlDbType.Char,200),
new SqlParameter("@PrimaryKey",SqlDbType.Char,100),
new SqlParameter("@Fields", SqlDbType.Char,200),
new SqlParameter("@PageSize",SqlDbType.Int,4),
new SqlParameter("@CurrentPage",SqlDbType.Int,4),
new SqlParameter("@Filter",SqlDbType.Char,200),
new SqlParameter("@Group",SqlDbType.Char,200),
new SqlParameter("@Order",SqlDbType.Char,200)};
parameters[0].Direction = ParameterDirection.Output;
parameters[1].Value = tableNames;
parameters[2].Value = primaryKey;
parameters[3].Value = fields;
parameters[4].Value = pageSize;
parameters[5].Value = pageIndex;
parameters[6].Value = filter;
parameters[7].Value = group;
parameters[8].Value = order;
SqlDataReader reader = DbHelper.RunProcedure("HB_GetBooksForPage", parameters);
string count = parameters[0].Value.ToString();
return reader;
}
但是parameters[0].Value总是null,请问是哪里出问题了?
drop procedure [dbo].[HB_GetBooksForPage]
GO
------------------------------------
--用途:得到指定分类的某页的数据
--项目名称:DownKe
--说明:
--时间:2009-4-23 23:34:47
------------------------------------
CREATE PROCEDURE [dbo].HB_GetBooksForPage
@Count VARCHAR(10) output,
@TableNames VARCHAR(200), --表名,可以是多个表,但不能用别名
@PrimaryKey VARCHAR(100), --主键,可以为空,但@Order为空时该值不能为空
@Fields VARCHAR(200), --要取出的字段,可以是多个表的字段,可以为空,为空表示select *
@PageSize INT, --每页记录数
@CurrentPage INT, --当前页,0表示第1页
@Filter VARCHAR(200) = '', --条件,可以为空,不用填 where
@Group VARCHAR(200) = '', --分组依据,可以为空,不用填 group by
@Order VARCHAR(200) = '' --排序,可以为空,为空默认按主键升序排列,不用填 order by
AS
BEGIN
DECLARE @SortColumn VARCHAR(200)
DECLARE @Operator CHAR(2)
DECLARE @SortTable VARCHAR(200)
DECLARE @SortName VARCHAR(200)
IF @Fields = ''
SET @Fields = '*'
IF @Filter = ''
SET @Filter = 'WHERE 1=1'
ELSE
SET @Filter = 'WHERE ' + @Filter
IF @Group <>''
SET @Group = 'GROUP BY ' + @Group
IF @Order <> ''
BEGIN
DECLARE @pos1 INT, @pos2 INT
SET @Order = REPLACE(REPLACE(@Order, ' asc', ' ASC'), ' desc', ' DESC')
IF CHARINDEX(' DESC', @Order) > 0
IF CHARINDEX(' ASC', @Order) > 0
BEGIN
IF CHARINDEX(' DESC', @Order) < CHARINDEX(' ASC', @Order)
SET @Operator = '<='
ELSE
SET @Operator = '>='
END
ELSE
SET @Operator = '<='
ELSE
SET @Operator = '>='
SET @SortColumn = REPLACE(REPLACE(REPLACE(@Order, ' ASC', ''), ' DESC', ''), ' ', '')
SET @pos1 = CHARINDEX(',', @SortColumn)
IF @pos1 > 0
SET @SortColumn = SUBSTRING(@SortColumn, 1, @pos1-1)
SET @pos2 = CHARINDEX('.', @SortColumn)
IF @pos2 > 0
BEGIN
SET @SortTable = SUBSTRING(@SortColumn, 1, @pos2-1)
IF @pos1 > 0
SET @SortName = SUBSTRING(@SortColumn, @pos2+1, @pos1-@pos2-1)
ELSE
SET @SortName = SUBSTRING(@SortColumn, @pos2+1, LEN(@SortColumn)-@pos2)
END
ELSE
BEGIN
SET @SortTable = @TableNames
SET @SortName = @SortColumn
END
END
ELSE
BEGIN
SET @SortColumn = @PrimaryKey
SET @SortTable = @TableNames
SET @SortName = @SortColumn
SET @Order = @SortColumn
SET @Operator = '>='
END
DECLARE @type varchar(50)
DECLARE @prec int
SELECT @type=t.name, @prec=c.prec
FROM sysobjects o
JOIN syscolumns c on o.id=c.id
JOIN systypes t on c.xusertype=t.xusertype
WHERE o.name = @SortTable AND c.name = @SortName
IF CHARINDEX('char', @type) > 0
SET @type = @type + '(' + CAST(@prec AS varchar) + ')'
DECLARE @TopRows INT
SET @TopRows = @PageSize * @CurrentPage + 1
print @TopRows
print @Operator
EXEC('
DECLARE @SortColumnBegin ' + @type + '
SET ROWCOUNT ' + @TopRows + '
SELECT @SortColumnBegin=' + @SortColumn + ' FROM ' + @TableNames + ' ' + @Filter + ' ' + @Group + ' ORDER BY ' + @Order + '
SET ROWCOUNT ' + @PageSize + '
SELECT ' + @Fields + ' FROM ' + @TableNames + ' ' + @Filter + ' AND ' + @SortColumn + '' + @Operator + '@SortColumnBegin ' + @Group + ' ORDER BY ' + @Order + '
')
exec('select * from '+@TableNames + ' ' + @Filter)
set @Count=@@rowcount
END
GO
下面是基于sqlhelper的方法: public SqlDataReader GetBookInPages(string tableNames,string primaryKey,string fields,int pageIndex, int pageSize, string filter,string group,string order)
{
SqlParameter[] parameters = {
new SqlParameter("@Count",SqlDbType.Char,10),
new SqlParameter("@TableNames",SqlDbType.Char,200),
new SqlParameter("@PrimaryKey",SqlDbType.Char,100),
new SqlParameter("@Fields", SqlDbType.Char,200),
new SqlParameter("@PageSize",SqlDbType.Int,4),
new SqlParameter("@CurrentPage",SqlDbType.Int,4),
new SqlParameter("@Filter",SqlDbType.Char,200),
new SqlParameter("@Group",SqlDbType.Char,200),
new SqlParameter("@Order",SqlDbType.Char,200)};
parameters[0].Direction = ParameterDirection.Output;
parameters[1].Value = tableNames;
parameters[2].Value = primaryKey;
parameters[3].Value = fields;
parameters[4].Value = pageSize;
parameters[5].Value = pageIndex;
parameters[6].Value = filter;
parameters[7].Value = group;
parameters[8].Value = order;
SqlDataReader reader = DbHelper.RunProcedure("HB_GetBooksForPage", parameters);
string count = parameters[0].Value.ToString();
return reader;
}
但是parameters[0].Value总是null,请问是哪里出问题了?
select @Count;
exec('select top 3 DocDate from Owtr')
set @Count=@@rowcount
select @Count;
----------结果---------------
2007-10-22 00:00:00.000
2007-10-22 00:00:00.000
2007-10-22 00:00:00.0003