• SQL存储过程分页


    一,常用的存储过程

    CREATE PROCEDURE  sp_GetRecordByPageOrder

    @tblName varchar(255)='wdf1', -- 表名

    @fldName varchar(1000) = '*', -- 需要返回的列

    @OrderfldName varchar(255)='userid', -- 排序的字段名

    @PageSize int = 10, -- 页尺寸

    @PageIndex int = 1, -- 页码

    @IsReCount bit = 0, -- 返回记录总数, 非 0 值则返回

    @OrderType bit = 0, -- 设置排序类型, 非 0 值则降序

    @strWhere varchar(1500) = '' -- 查询条件 (注意: 不要加 where)

    AS

    declare @strSQL varchar(5000) -- 主语句

    declare @strTmp varchar(110) -- 临时变量

    declare @strOrder varchar(400) -- 排序类型

    if @IsReCount != 0

    begin

    if @strWhere !=''

    set @strSQL = 'select count(*) as Total from [' + @tblName + '] where '+@strWhere

    else

    set @strSQL = 'select count(*) as Total from [' + @tblName + ']'

    end

    --以上代码的意思是如果@IsReCount传递过来的不是0,就执行总数统计。以下的所有代码都是@IsReCount为0的情况

    else

    begin

    if @OrderType != 0

    begin

    set @strTmp = '<(select min'

    set @strOrder = ' order by [' + @OrderfldName +'] desc'

    --如果@OrderType不是0,就执行降序,这句很重要!

    end

    else

    begin

    set @strTmp = '>(select max'

    set @strOrder = ' order by [' + @OrderfldName +'] asc'

    end

    if @PageIndex = 1

    begin

    if @strWhere != ''

    set @strSQL = 'select top ' + str(@PageSize) +' '+@fldName+ ' from [' + @tblName + '] where ' + @strWhere + ' ' + @strOrder

    else

    set @strSQL = 'select top ' + str(@PageSize) +' '+@fldName+ ' from ['+ @tblName + '] '+ @strOrder

    --如果是第一页就执行以上代码,这样会加快执行速度

    end

    else

    begin

    --以下代码赋予了@strSQL以真正执行的SQL代码

    set @strSQL = 'select top ' + str(@PageSize) +' '+@fldName+ ' from ['

    + @tblName + '] where [' + @OrderfldName + ']' + @strTmp + '(['+ @OrderfldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['+ @OrderfldName + '] from [' + @tblName + ']' + @strOrder + ') as tblTmp)'+ @strOrder

    if @strWhere != ''

    set @strSQL = 'select top ' + str(@PageSize) +' '+@fldName+ ' from ['

    + @tblName + '] where [' + @OrderfldName + ']' + @strTmp + '(['

    + @OrderfldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['

    + @OrderfldName + '] from [' + @tblName + '] where ' + @strWhere + ' '

    + @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder

    end

    end

    exec (@strSQL)
    GO


    二、在SQL server 2005 中 多了个Row_Number() over (order by ID DESC)语句,使分页更加简单了,

    意思是生成一个顺序的行号,而他生成顺序的标准,就是后面紧跟的over(order by ID Desc)

    DECLARE @rows_per_page AS INTEGER
    DECLARE @current_page AS INTEGER
    DECLARE @total_pages AS INTEGER
    DECLARE @start_item AS INTEGER
    DECLARE @items_count AS INTEGER
    -- 设置每页的行数
    SET @rows_per_page = 10
    -- 设置要显示的页号(从1开始)
    SET @current_page = 3
    SELECT @total_pages = COUNT(*) / @rows_per_page + 1,
     @items_count= COUNT(*)
     FROM BarefootIndex;--表名(这是修改的地方)
    --计算此页中从第几个开始显示
    SET @start_item = @rows_per_page * (@current_page - 1)
    select * from
    (
     select ROW_NUMBER() OVER (order by ID) as item--用什么排序(返回正在显示第几条)
      ,@items_count AS items_count --一共有多少条
      ,@current_page AS current_page  --当前页
      ,@total_pages AS total_pages --一共多少页
      ,* from BarefootIndex--表名(这是修改的地方)
    ) as T
    where T.item >= @start_item + 1
    AND T.item <= @start_item + @rows_per_page


    三、如果在sql server 2005 之前运行 我这儿提供一个方法获得行号
    --有表Test_Student: id int,name varchar(500),age int,sex bit
    declare @t table(row int,id int,[name] varchar(500),age int,sex bit)/*定义和Test_Student结构一样的表变量,但多一列int类型记录行号row*/
    declare @rt table(row int,id int,[name] varchar(500),age int,sex bit))/*定义和Test_Student结构一样的表变量,但多一列int类型记录行号row*/
    insert into @t select 0,id,[name],age,sex from Test_Student order by age

    declare @count int
    select @count=count(*) from Test_Student
    declare @r int

    set @r=1
    while @r<=@count
    begin
    insert into @rt  select top 1 @r,id,[name],age,sex from @t
    delete from @t where id=(select top 1 id from @t)
    set @r=@r+1
    end

    select * from @rt

  • 相关阅读:
    .NET Core开发日志——从搭建开发环境开始
    通过Docker构建TensorFlow Serving
    通过Jenkins在IIS上布署站点
    RabbitMQ in Depth札记——AMQ协议
    Web API对application/json内容类型的CORS支持
    ng-book札记——路由
    ng-book札记——HTTP
    ng-book札记——依赖注入
    UVA
    POJ
  • 原文地址:https://www.cnblogs.com/OpenCoder/p/1566559.html
Copyright © 2020-2023  润新知