SqlServer分页存储过程

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IF OBJECT_ID(N'dbo.p_show') IS NOT NULL
    DROP PROCEDURE dbo.p_show
GO

/**//*--实现分页的通用存储过程

    显示指定表、视图、查询结果的第X页
    对于表中主键或标识列的情况,直接从原表取数查询，其它情况使用临时表的方法
    如果视图或查询结果中有主键,不推荐此方法
    如果使用查询语句,而且查询语句使用了order by,则查询语句必须包含top 语句

最后更新时间: 2008.01.20
--邹建 2003.09(引用请保留此信息)--*/

/**//*--调用示例
EXEC dbo.p_show
    @QueryStr = N'tb',
    @PageSize = 5,
    @PageCurrent = 3,
    @FdShow = 'id, colid, name',
    @FdOrder = 'colid, name'
select id, colid from tb
order by colid, name


EXEC dbo.p_show
    @QueryStr = N'
SELECT TOP 100 PERCENT
    *
FROM dbo.sysobjects
ORDER BY xtype',
    @PageSize = 5,
    @PageCurrent = 2,
    @FdShow = 'name, xtype',
    @FdOrder = 'xtype, name'
--*/
CREATE PROC dbo.p_show
    @QueryStr nvarchar(4000),        -- 表名、视图名、查询语句
    @PageSize int=10,                -- 每页的大小(行数)
    @PageCurrent int=1,                -- 要显示的页
    @FdShow nvarchar (4000) = N'',    -- 要显示的字段列表,如果查询结果不需要标识字段,需要指定此值,且不包含标识字段
    @FdOrder nvarchar (1000) = N''    -- 排序字段列表
AS
SET NOCOUNT ON
DECLARE
    @FdName sysname,    --表中的主键或表、临时表中的标识列名
    @Id1 sysname,        --开始和结束的记录号
    @Id2 sysname,
    @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(@QueryStr),
    @FdShow = CASE
                WHEN @FdShow > N'' THEN N' ' + @FdShow
                ELSE N' *'
            END,
    @FdOrder = CASE
                WHEN @FdOrder > N'' THEN N' ORDER BY ' + @FdOrder
                ELSE N' '
            END,
    @QueryStr = CASE
                WHEN @Obj_ID IS NULL THEN N' (' + @QueryStr + N')A'
                ELSE N' ' + @QueryStr
            END

-- 如果显示第一页，可以直接用 top 来完成
IF @PageCurrent = 1   
BEGIN
    SELECT
        @Id1 = CAST(@PageSize as varchar(20))
    EXEC(N'
SELECT TOP ' + @Id1 + N'
    ' + @FdShow + N'
FROM ' + @QueryStr + N'
' + @FdOrder
)
    RETURN
END

-- 如果是表, 则检查表中是否有标识更或主键
IF @Obj_ID IS NULL OR OBJECTPROPERTY(@Obj_ID, 'IsTable') = 0
    GOTO lb_usetemp
ELSE
BEGIN
    SELECT
        @Id1 = CAST(@PageSize as varchar(20)),
        @Id2 = CAST((@PageCurrent - 1) * @PageSize as varchar(20))

    -- 标识列
    SELECT
        @FdName = name
    FROM dbo.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
        DECLARE
            @pk_number int

        SELECT
            @strfd = N'',
            @strjoin = N'',
            @strwhere = N''

        SELECT
            @strfd = @strfd
                    + N',' + QUOTENAME(name),
            @strjoin = @strjoin
                    + N' AND A.' + QUOTENAME(name)
                    + N'=B.' +  QUOTENAME(name),
            @strwhere = @strwhere
                    + N' AND B.' + QUOTENAME(name) + N' IS NULL'
        FROM(
            SELECT
                IX.id, IX.indid,
                IXC.colid, ixc.keyno,
                C.name
            FROM dbo.sysobjects O,
                dbo.sysindexes IX,
                dbo.sysindexkeys IXC,
                dbo.syscolumns C
            WHERE O.parent_obj = @Obj_ID
                AND O.xtype = 'PK'
                AND O.name = IX.name
                AND IX.id = @Obj_ID
                AND IX.id = IXC.id
                AND IX.indid = IXC.indid
                AND IXC.id = C.id
                AND IXC.colid = C.colid
        )A
        ORDER BY keyno

        SELECT
            @pk_number = @@ROWCOUNT,           
            @strfd = STUFF(@strfd, 1, 1, N''),
            @strjoin = STUFF(@strjoin, 1, 5, N''),
            @strwhere = STUFF(@strwhere, 1, 5, N'')           

        IF @pk_number = 0
            GOTO lb_usetemp        --如果表中无主键,则用临时表处理
        ELSE IF @pk_number = 1
        BEGIN
            SELECT
                @FdName = @strfd
            GOTO lb_useidentity    -- 使用单一主键
        END
        ELSE
            GOTO lb_usepk        -- 使用复合主键
    END
END

/**//*--使用标识列或主键为单一字段的处理方法--*/
lb_useidentity:   
EXEC(N'
SELECT TOP ' + @Id1 + N'
    ' + @FdShow + N'
FROM '+@QueryStr + N'
WHERE ' + @FdName + ' NOT IN(
        SELECT TOP ' + @Id2 + N'
            ' + @FdName + '
        FROM ' + @QueryStr + N'
        ' + @FdOrder + N')
' + @FdOrder + N'
')
RETURN

/**//*--表中有复合主键的处理方法--*/
lb_usepk:       
EXEC(N'
SELECT
    ' + @FdShow + N'
FROM(
    SELECT TOP ' + @Id1 + N'
        A.*
    FROM ' + @QueryStr + N' A
        LEFT JOIN(
                SELECT TOP ' + @Id2 + N'
                    ' + @strfd + N'
                FROM ' + @QueryStr + N'
                ' + @FdOrder + N'
            )B
                ON ' + @strjoin + N'
    WHERE ' + @strwhere + N'
    ' + @FdOrder + N'
)A
' + @FdOrder + N'
')
RETURN

/**//*--用临时表处理的方法--*/
lb_usetemp:       
SELECT
    @FdName = QUOTENAME(N'ID_' + CAST(NEWID() as varchar(40))),
    @Id1 = CAST(@PageSize * (@PageCurrent-1) as varchar(20)),
    @Id2 = CAST(@PageSize * @PageCurrent-1 as varchar(20))

EXEC(N'
SELECT
    ' + @FdName + N' = IDENTITY(int, 0, 1),
    ' + @FdShow + N'
INTO #tb
FROM(
    SELECT TOP 100 PERCENT
        *
    FROM ' + @QueryStr + N'
    ' + @FdOrder + N'
)A
' + @FdOrder + N'

SELECT
    ' + @FdShow + N'
FROM #tb
WHERE ' + @FdName + ' BETWEEN ' + @Id1 + ' AND ' + @Id2 + N'
'
)
GO