sql 针对拼接语句的优化

在日常的开发中尽量少采用拼接语句，但针对多条件联合查询，并有多字段可以偏序的情况下，的确采用拼接语句要方便简单得多，单数据库会因为传入的参数不同而产生不同的计划数，计划数多了，对数据库影响很大。

为了降低计划数，我们采用以下方法

ALTER PROCEDURE pppp
    @nPageIndex INT ,
    @nPageSize INT ,
    @vcChatRoomId varchar(200),
    @vcWXID varchar(200),
    @vcType varchar(10),
    @vcDay varchar(10),
    @nSwith int,
    @vcKeyword varchar(40),
    @vcRobotWxId varchar(200),
    @vcSort varchar(10)
AS
BEGIN
    ----优化
    DECLARE @vcListSql nVARCHAR(1000)= ''
    DECLARE @vcListSql1 nVARCHAR(3000)= ''
    DECLARE @vcListSql2 nVARCHAR(1000)= ''
    DECLARE @vcSumSql nVARCHAR(4000)= ''
    DECLARE @vcCommonSql nvarchar(4000)= '' --表
    DECLARE @vcSigleSql nvarchar(4000)= '' --个人
    DECLARE @vcSortSql VARCHAR(100)= ''
    DECLARE @vcSigleSortSql VARCHAR(100)= '' 

    declare @temp_date_start varchar(10)
    declare @temp_date_end varchar(10)
    DECLARE @date1_1 varchar(50)
    DECLARE @date1_2 varchar(50)

    DECLARE @vcPage varchar(4)

    if @vcKeyword =''
    begin
        set @vcKeyword = '%'
    end
    else
    begin
        --set @vcKeyword =  '%'+RTRIM(@vcKeyword) + '%'
        set @vcKeyword =  '%'+@vcKeyword + '%'
    end

    DECLARE @inAdmin VARCHAR(200)=''

    --排序
    if @vcType = 'fy' --发言
        begin
            SET @vcSortSql = ' bb.inMsgCount ' + @vcSort
            SET @vcSigleSortSql = ' bb.inMsgCount desc'
        end
    else if @vcType = 'dt' --动态
        begin
            set @vcSortSql = ' bb.inLinkCount ' + @vcSort
            set @vcSigleSortSql = ' bb.inLinkCount desc'
        end
    else if @vcType = 'qd' --签到
        begin
            set @vcSortSql = ' bb.inQd ' + @vcSort
            set @vcSigleSortSql = ' bb.inQd desc'
        END
    ELSE IF @vcType='gl' --管理员
        begin
            SET @vcSortSql = ' bb.inMsgCount ' + @vcSort
            SET @vcSigleSortSql = ' bb.inMsgCount desc'
            SET @inAdmin=' and inAdmin = 2'
        end
    ELSE IF @vcType='fhb'
        begin
            SET @vcSortSql = ' bb.nmMoney ' + @vcSort
            SET @vcSigleSortSql = ' bb.nmMoney desc'
        end
    ELSE IF @vcType='qhb'
        begin
            SET @vcSortSql = ' bb.nmTakeMoney ' + @vcSort
            SET @vcSigleSortSql = ' bb.nmTakeMoney desc'
        end    

    set @temp_date_end = CONVERT(VARCHAR(10), GETDATE(),23)

    if @vcDay = ''
    begin
        set @date1_1 ='1900-01-01 00:00:00'
        set @date1_2 = @temp_date_end +' 23:59:59'
    end
    else if @vcDay = 'd'
    begin
        set @temp_date_start =  CONVERT(VARCHAR(10), GETDATE(),23)
        set @date1_1 = @temp_date_start +' 00:00:00'
        set @date1_2 = @temp_date_end +' 23:59:59'
    end
    else if @vcDay = 'w'
    begin
        set @temp_date_start =  CONVERT(VARCHAR(10), GETDATE()-7,23)
        set @date1_1 = @temp_date_start +' 00:00:00'
        set @date1_2 = @temp_date_end +' 23:59:59'
    end
    else if @vcDay = 'm'
    begin
        set @temp_date_start =  CONVERT(VARCHAR(10), GETDATE()-31,23)
        set @date1_1 = @temp_date_start +' 00:00:00'
        set @date1_2 = @temp_date_end +' 23:59:59'
    end    

    --拼接Sql语句

    --累计条数分页
    set @vcPage = CONVERT(VARCHAR(10),(@nPageIndex * @nPageSize))

    SET @vcListSql = 'SELECT ROW_NUMBER() OVER (order by OrderByColumn) as nRowNumber,aa.vcWXID,aa.vcHeadImgLocal,aa.dtLastTime,aa.nTheID,aa.vcFatherWX,aa.nRelationType
                     ,aa.vcTag,aa.inAdmin,aa.vcGroupRemarks,aa.vcDisplayName as vcNickName,bb.inMsgCount,bb.inQd,bb.inLinkCount,bb.nmMoney,bb.nmTakeMoney '

    set @vcListSql1 = ' FROM TableZZ aa JOIN    (
                                        SELECT a.vcChatRoomID,a.vcWXID

                                        ,ISNULL(c.inMsgCount,0)as inMsgCount,ISNULL(c.inSignCount,0)as inSignCount
                                        ,ISNULL(e.inQd,0) as inQd
                                        ,ISNULL(f.inLinkCount,0) as inLinkCount
                                        ,isnull(g.nmMoney,0) as nmMoney
                                        ,isnull(h.nmTakeMoney,0) as  nmTakeMoney

                                        FROM TableZZ a
                                            left join  (select vcChatRoomID,vcWXID,SUM(inMsgCount)inMsgCount,SUM(inSignCount) inSignCount from tabale1
                                                        where vcChatRoomID=@vcChatRoomID
                                                        and dtReportDate >= @date1_1 and dtReportDate<=@date1_2
                                                        GROUP BY vcChatRoomID,vcWXID
                                                        ) c
                                                        on  a.vcChatRoomID=c.vcChatRoomID and a.vcWXID=c.vcWXID
                                            left join (select vcChatRoomID,vcWXID,SUM(case when vcWXID is not null then 1 else 0 end) as inQd from table2
                                                        where vcChatRoomID=@vcChatRoomID
                                                        and dtCreateDate >= @date1_1   and dtCreateDate<=@date1_2
                                                        GROUP BY vcChatRoomID,vcWXID
                                                        ) e
                                                        on  a.vcChatRoomID=e.vcChatRoomID and a.vcWXID=e.vcWXID
                                            left join  (select vcChatRoomID,vcFormWXID,SUM(case when vcFormWXID is not null then 1 else 0 end) as inLinkCount from table3
                                                        where vcChatRoomID=@vcChatRoomID
                                                        and dtCreateTime >= @date1_1   and dtCreateTime<=@date1_2
                                                        GROUP BY vcChatRoomID,vcFormWXID
                                                        ) f
                                                        on  a.vcChatRoomID=f.vcChatRoomID and a.vcWXID=f.vcFormWXID
                                            left join (SELECT vcSendWXId,SUM(nmMoney) nmMoney FROM table4
                                                        where vcChatRoomID=@vcChatRoomID
                                                        GROUP BY vcChatRoomID,vcSendWXId ) g ON a.vcWXID=g.vcSendWXId
                                            left join (SELECT vcTakeWXID,SUM(nmTakeMoney) nmTakeMoney
                                                        FROM table5
                                                        where vcChatRoomID=@vcChatRoomID GROUP BY vcTakeWXID ) h
                                                    ON a.vcWXID=h.vcTakeWXID
                                            WHERE  a.vcChatRoomID=@vcChatRoomID and a.vcWXID <> @vcRobotWxId AND a.inStatus=0 ' 

    set @vcListSql2 = ' and (a.vcNickName like @vcKeyword)

                                        )    bb on aa.vcChatRoomID=bb.vcChatRoomID and aa.vcWXID=bb.vcWXID'
    --group by a.vcChatRoomID,a.vcWXID
    --记录条数
    SET @vcSumSql = 'SELECT 1 AS nResult,COUNT(*) AS nCount ' +@vcListSql1 +@inAdmin + @vcListSql2 

    --
    SET @vcCommonSql = 'SELECT * from (' + @vcListSql +@vcListSql1 +@inAdmin + @vcListSql2 + ' ) as ChatRoomMemberList where nRowNumber BETWEEN 1 AND @vcPage'

    --个人
    SET @vcSigleSql = 'SELECT * from (' + @vcListSql + @vcListSql1 + @vcListSql2 + ' ) as ChatRoomMemberSigle where vcWXID = @vcWXID'

    --针对排序语句 采用替换
    set @vcCommonSql = replace(@vcCommonSql,'OrderByColumn',@vcSortSql);

    set @vcSigleSql = replace(@vcSigleSql,'OrderByColumn',@vcSigleSortSql);

    if @nSwith = 0 --是否查询个人
    begin
        -- 针对条件参数，采取以下方式
        --显示统计
        exec sp_executesql @vcSumSql,N'@date1_1 varchar(50),@date1_2 varchar(50),@vcChatRoomID varchar(100),@vcRobotWxId varchar(200),@vcKeyword varchar(40)',@date1_1,@date1_2,@vcChatRoomID,@vcRobotWxId,@vcKeyword
        --分页列表
        exec sp_executesql @vcCommonSql,N'@date1_1 varchar(50),@date1_2 varchar(50),@vcChatRoomID varchar(100),@vcRobotWxId varchar(200),@vcKeyword varchar(40),@vcPage varchar(4)',@date1_1,@date1_2,@vcChatRoomID,@vcRobotWxId,@vcKeyword,@vcPage
        --个人信息
        exec sp_executesql @vcSigleSql,N'@date1_1 varchar(50),@date1_2 varchar(50),@vcChatRoomID varchar(100),@vcRobotWxId varchar(200),@vcKeyword varchar(40),@vcWXID varchar(200)',@date1_1,@date1_2,@vcChatRoomID,@vcRobotWxId,@vcKeyword,@vcWXID
    end
    else
    begin
        --print 1
        --显示统计
        exec sp_executesql @vcSumSql,N'@date1_1 varchar(50),@date1_2 varchar(50),@vcChatRoomID varchar(100),@vcRobotWxId varchar(200),@vcKeyword varchar(40)',@date1_1,@date1_2,@vcChatRoomID,@vcRobotWxId,@vcKeyword
        --分页列表
        exec sp_executesql @vcCommonSql,N'@date1_1 varchar(50),@date1_2 varchar(50),@vcChatRoomID varchar(100),@vcRobotWxId varchar(200),@vcKeyword varchar(40),@vcPage varchar(4)',@date1_1,@date1_2,@vcChatRoomID,@vcRobotWxId,@vcKeyword,@vcPage
    end    

end