SQL Server 分頁通用存儲過程（1）

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[UP_PageView]
@tbname     sysname,             --要分頁顯示的表名
@FieldKey   nvarchar(1000),      --用於定位記錄的主鍵(惟一鍵)字段,可以是逗號分隔的多個字段
@PageCurrent int=1,              --要顯示的頁碼
@PageSize   int=10,              --每頁的大小(記錄數)
@FieldShow  nvarchar(1000)='',   --以逗號分隔的要顯示的字段列表,如果不指定,則顯示所有字段
@FieldOrder  nvarchar(1000)='',  --以逗號分隔的排序字段列表,可以指定在字段後面指定DESC/ASC用於指定排序順序
@Where     nvarchar(1000)='',    --查詢條件
@PageCount  int OUTPUT,          --總頁數
@RecordCount int OUTPUT          --總記錄數
AS
SET NOCOUNT ON
--檢查對象是否有效
IF OBJECT_ID(@tbname) IS NULL
BEGIN
    RAISERROR(N'對象"%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、視圖或者表值函數',1,16,@tbname)
    RETURN
END
--分頁字段檢查
IF ISNULL(@FieldKey,N'')=''
BEGIN
    RAISERROR(N'分頁處理需要主鍵（或者惟一鍵）',1,16)
    RETURN
END
--其他參數檢查及規範
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爲NULL值,則計算總頁數(這樣設計可以只在第一次計算總頁數,以後調用時,把總頁數傳回給存儲過程,避免再次計算總頁數,對於不想計算總頁數的處理而言,可以給@PageCount賦值)
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
--計算分頁顯示的TOPN值
DECLARE @TopN varchar(20),@TopN1 varchar(20)
SELECT @TopN=@PageSize,
    @TopN1=@PageCurrent*@PageSize
--第一頁直接顯示
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
    --生成主鍵(惟一鍵)處理條件
    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
    --執行查詢
    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