set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[UP_PageView]
@tbname sysname, --要分页显示的表名
@FieldKey nvarchar(1000), --用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段
@PageCurrent int=1, --要显示的页码
@PageSize int=10, --每页的大小(记录数)
@FieldShow nvarchar(1000)='', --以逗号分隔的要显示的字段列表,如果不指定,则显示所有字段
@FieldOrder nvarchar(1000)='', --以逗号分隔的排序字段列表,可以指定在字段后面指定DESC/ASC用于指定排序顺序
@Where nvarchar(1000)='', --查询条件
@PageCount int OUTPUT, --总页数
@RecordCount int OUTPUT --总记录数
AS
SET NOCOUNT ON
--检查对象是否有效
IF OBJECT_ID(@tbname) IS NULL
BEGIN
RAISERROR(N'对象"%s"不存在',1,16,@tbname)
RETURN
END
IF OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTable')=0
AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsView')=0
AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTableFunction')=0
BEGIN
RAISERROR(N'"%s"不是表、视图或者表值函数',1,16,@tbname)
RETURN
END
--分页字段检查
IF ISNULL(@FieldKey,N'')=''
BEGIN
RAISERROR(N'分页处理需要主键（或者惟一键）',1,16)
RETURN
END
--其他参数检查及规范
IF ISNULL(@PageCurrent,0)<1 SET @PageCurrent=1
IF ISNULL(@PageSize,0)<1 SET @PageSize=10
IF ISNULL(@FieldShow,N'')=N'' SET @FieldShow=N'*'
IF ISNULL(@FieldOrder,N'')=N''
SET @FieldOrder=N''
ELSE
SET @FieldOrder=N'ORDER BY '+LTRIM(@FieldOrder)
IF ISNULL(@Where,N'')=N''
SET @Where=N''
ELSE
SET @Where=N'WHERE ([email='+@Where+N')']'+@Where+N')'[/email]
--如果@PageCount为NULL值,则计算总页数(这样设计可以只在第一次计算总页数,以后调用时,把总页数传回给存储过程,避免再次计算总页数,对于不想计算总页数的处理而言,可以给@PageCount赋值)
IF @PageCount IS NULL
BEGIN
DECLARE @sql nvarchar(4000)
SET @sql=N'SELECT @RecordCount=COUNT(*)'
+N' FROM [email='+@tbname]'+@tbname[/email]
+N' [email='+@Where]'+@Where[/email]
EXEC sp_executesql @sql,N'@RecordCount int OUTPUT',@RecordCount OUTPUT
SET @PageCount=(@RecordCount+@PageSize-1)/@PageSize
END
--计算分页显示的TOPN值
DECLARE @TopN varchar(20),@TopN1 varchar(20)
SELECT @TopN=@PageSize,
@TopN1=@PageCurrent*@PageSize
--第一页直接显示
IF @PageCurrent=1
EXEC(N'SELECT TOP [email='+@TopN]'+@TopN[/email]
+N' [email='+@FieldShow]'+@FieldShow[/email]
+N' FROM [email='+@tbname]'+@tbname[/email]
+N' [email='+@Where]'+@Where[/email]
+N' [email='+@FieldOrder]'+@FieldOrder[/email])
ELSE
BEGIN
--生成主键(惟一键)处理条件
DECLARE @Where1 nvarchar(4000),@s nvarchar(1000)
SELECT @Where1=N'',@s=@FieldKey
WHILE CHARINDEX(N',',@s)>0
SELECT @s=STUFF(@s,1,CHARINDEX(N',',@s),N''),
@Where1=@Where1
+N' AND a.'+LEFT(@s,CHARINDEX(N',',@s)-1)
+N'='+LEFT(@s,CHARINDEX(N',',@s)-1)
SELECT @Where1=STUFF(@Where1+N' AND [email=a.'+@s+N'='+@s,1,5,N'']a.'+@s+N'='+@s,1,5,N''[/email]),
@TopN=@TopN1-@PageSize
--执行查询
EXEC(N'SET ROWCOUNT [email='+@TopN1]'+@TopN1[/email]
+N' SELECT [email='+@FieldKey]'+@FieldKey[/email]
+N' INTO # FROM [email='+@tbname]'+@tbname[/email]
+N' [email='+@Where]'+@Where[/email]
+N' [email='+@FieldOrder]'+@FieldOrder[/email]
+N' SET ROWCOUNT [email='+@TopN]'+@TopN[/email]
+N' DELETE FROM #'
+N' SELECT [email='+@FieldShow]'+@FieldShow[/email]
+N' FROM [email='+@tbname]'+@tbname[/email]
+N' a WHERE EXISTS(SELECT * FROM # WHERE [email='+@Where1]'+@Where1[/email]
+N') [email='+@FieldOrder]'+@FieldOrder[/email])
END
