两种通用分页存储过程的对比

发表：联高软件www.legalsoft.com.cn，本文被阅读：1 次

两种通用分页存储过程的对比

第一种：

CREATE PROCEDURE xsp_ination
(
@tblName   varchar(64),				   
@strGetFields varchar(256) = "*", 
@fldName varchar(64)="",				
@PageSize   int = 20,					
@PageIndex  int = 1,						
@OrderType bit = 1,						
@strWhere  varchar(512) = ""	
)
AS 
BEGIN
declare @strSQL   varchar(1000)   
declare @strTmp   varchar(110)     
declare @strOrder varchar(400)   
SET NOCOUNT ON
if @OrderType != 0
	begin
		set @strTmp = "<(select min" 
		set @strOrder = " order by [" + @fldName +"] desc" 
	end
else 
	begin 
		set @strTmp = ">(select max" 
		set @strOrder = " order by [" + @fldName +"] asc" 
	end 
if @PageIndex = 1
	begin
		if @strWhere != ""   
			set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ "  from " + @tblName + " where " + @strWhere + " " + @strOrder
		else 
			set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ "  from "+ @tblName + " "+ @strOrder
	end
else 
	begin
		set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ "  from "
							+ @tblName + " where [" + @fldName + "]" + @strTmp + "(["+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " ["+ @fldName + "] from " + @tblName + " " + @strOrder + ") as tblTmp)"+ @strOrder
		if @strWhere != "" 
			set @strSQL = "select top " + str(@PageSize) +" "+@strGetFields+ "  from "
							+ @tblName + " where [" + @fldName + "]" + @strTmp + "(["
							+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) + " [" 
							+ @fldName + "] from " + @tblName + " where " + @strWhere + " "
							+ @strOrder + ") as tblTmp) and " + @strWhere + " " + @strOrder 
	end
EXEC (@strSQL)
if @@error=0 return 1
SET NOCOUNT OFF
END
GO

优点：使用相对简单；
缺点：个别时候会出现数据查询结果不对。

CREATE PROC xsp_page
@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
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 ("+@Where+N")"
--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)
DECLARE @PageCount int
IF @PageCount IS NULL
BEGIN
    DECLARE @sql nvarchar(4000)
    SET @sql=N"SELECT @PageCount=COUNT(*)"
        +N" FROM "+@tbname
        +N" "+@Where
    EXEC sp_executesql @sql,N"@PageCount int OUTPUT",@PageCount OUTPUT
    SET @PageCount=(@PageCount+@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-1)*@PageSize
--第一页直接显示
IF @PageCurrent=1
    EXEC(N"SELECT TOP "+@TopN
        +N" "+@FieldShow
        +N" FROM "+@tbname
        +N" "+@Where
        +N" "+@FieldOrder)
ELSE
BEGIN
    --处理别名
    IF @FieldShow=N"*"
        SET @FieldShow=N"a.*"
    --生成主键(惟一键)处理条件
    DECLARE @Where1 nvarchar(4000),@Where2 nvarchar(4000),
        @s nvarchar(1000),@Field sysname
    SELECT @Where1=N"",@Where2=N"",@s=@FieldKey
    WHILE CHARINDEX(N",",@s)>0
        SELECT @Field=LEFT(@s,CHARINDEX(N",",@s)-1),
            @s=STUFF(@s,1,CHARINDEX(N",",@s),N""),
            @Where1=@Where1+N" AND a."+@Field+N"=b."+@Field,
            @Where2=@Where2+N" AND b."+@Field+N" IS NULL",
            @Where=REPLACE(@Where,@Field,N"a."+@Field),
            @FieldOrder=REPLACE(@FieldOrder,@Field,N"a."+@Field),
            @FieldShow=REPLACE(@FieldShow,@Field,N"a."+@Field)
    SELECT @Where=REPLACE(@Where,@s,N"a."+@s),
        @FieldOrder=REPLACE(@FieldOrder,@s,N"a."+@s),
        @FieldShow=REPLACE(@FieldShow,@s,N"a."+@s),
        @Where1=STUFF(@Where1+N" AND a."+@s+N"=b."+@s,1,5,N""),    
        @Where2=CASE
            WHEN @Where="" THEN N"WHERE ("
            ELSE @Where+N" AND ("
            END+N"b."+@s+N" IS NULL"+@Where2+N")"
    --执行查询
    EXEC(N"SELECT TOP "+@TopN
        +N" "+@FieldShow
        +N" FROM "+@tbname
        +N" a LEFT JOIN(SELECT TOP "+@TopN1
        +N" "+@FieldKey
        +N" FROM "+@tbname
        +N" a "+@Where
        +N" "+@FieldOrder
        +N")b ON "+@Where1
        +N" "+@Where2
        +N" "+@FieldOrder)
END
GO

优点：稳定，性能不错；
缺点：对主键设置要求很高。
技巧：如果出现查询结果没有，需要检察主键设置，或者干脆重新创建一个表。

联高软件

联高软件 > 技术文章 > Web数据库开发

·程序员必须知道的SQLSERVER数据库优化技巧 (14860)
·在Windows xp系统上安装了SQL server服务器版 (2798)
·SQL优化(索引、存储过程、数据分页的存储过程) (3688)
·ASP与存储过程 (1878)
·数据库中存储过程的自动化生成 (2393)
·在ASP.Net中两种利用CSS实现多界面的方法 (914)
·介绍两种调试程序的方法 (2999)
·C++Builder下实现对端口读写的两种方法 (2467)