/***************************************************************************
描述：1.支持多表查询 2.支持任意排序 3.不支持表别名
　　　参考了evafly920:[分享]千万数量级分页存储过程
IF(EXISTS(SELECT * FROM sysobjects WHERE [id]=OBJECT_ID('sp_GetRecordsByPage') AND xtype='P'))
DROP PROCEDURE sp_GetRecordsByPage
******************************************************************************/
ALTER       PROCEDURE sp_GetRecordsByPage
@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) + 1
print @TopRows
print @Operator
EXEC('
DECLARE @SortColumnBegin ' + @type + '
SET ROWCOUNT ' + @TopRows + '
SELECT @SortColumnBegin=' + @SortColumn + ' FROM  ' + @TableNames + ' ' + @Filter + ' AND ' + @SortColumn + ' IS NOT NULL ' + @Group + ' ORDER BY ' + @Order + '
SET ROWCOUNT ' + @PageSize + '
SELECT ' + @Fields + ' FROM  ' + @TableNames + ' ' + @Filter  + ' AND ' + @SortColumn + '' + @Operator + '@SortColumnBegin ' + @Group + ' ORDER BY ' + @Order + '
')
----------------------------------------------------------------------------------------------------------
/**//*    DECLARE @sql varchar(1000)
SET @sql='
DECLARE @SortColumnBegin ' + @type + '
SELECT @SortColumnBegin=' + @SortColumn + ' FROM  ' + @TableNames + ' ' + @Filter + ' ' + @Group + ' ORDER BY ' + @Order + '
SELECT ' + @Fields + ' FROM  ' + @TableNames + ' ' + @Filter  + ' AND ' + @SortColumn + '' + @Operator + '@SortColumnBegin ' + @Group + ' ORDER BY ' + @Order + '
'
PRINT @sql
*/
---------------------------------------------------------------------------------------------------------------
END