SQL 使用临时表和临时变量完成update表字段---实际案例

-- 使用临时表
-- 创建临时表
--ALTER TABLE TS_ExpenseApplication_Reim_Detail ADD BgCode NVARCHAR() NULL, BgItem NVARCHAR() NULL, BgCate NVARCHAR() NULL;

IF OBJECT_ID('dbo.tempExpense','U') IS NOT NULL DROP TABLE dbo.tempExpense;
GO

SELECT *
INTO dbo.tempExpense
FROM TS_ExpenseApplication_Reim_Detail
where ISNULL(Bgcode,'')=''
ORDER BY TaskID;
--select budgetno,BgCode,* from TS_ExpenseApplication_Reim_Detail
--select * from TS_ExpenseApplication_Reim_Detail1
--SELECT * FROM dbo.tempExpense;

-- 声明变量
DECLARE
    @task AS INT,
    @budgetnum AS NVARCHAR() ,
    @budgetcode AS NVARCHAR(),
    @Costcenter AS NVARCHAR() ,
    @Feecategory AS NVARCHAR(),
    @budgetItem AS NVARCHAR();

WHILE EXISTS(SELECT TaskID FROM dbo.tempExpense)
BEGIN
    -- 也可以使用top
    SET ROWCOUNT
    SELECT @task= TaskID, @budgetnum= BudgetNo FROM dbo.tempExpense;
　　--抓取费用类别
    select @Costcenter=FreeCategory from TS_ExpenseApplication_Reim a inner join Trina_CostCenterFreeCategory b on a.costcentercode=b.CostCenterCode
    where TaskID=@task;
    print @Costcenter;
    --B002 BA05 B003 B004 B003_1 B004_1 B006 B007 B010 B017 B021 B022 B027 B030 B031 B032 B027高管手机
    --根据规则匹配对应预算号
    begin
    if  CHARINDEX('B004_1',@budgetnum)>
        set @budgetcode='B004_1';
    else if CHARINDEX('B003_1',@budgetnum)>
        set @budgetcode='B003_1';
    else if CHARINDEX('B027高管手机',@budgetnum)>
        set @budgetcode='B027高管手机';
    else if CHARINDEX('B002',@budgetnum)>
        set @budgetcode='B002';
    else if CHARINDEX('BA05',@budgetnum)>
        set @budgetcode='BA05';
    else if CHARINDEX('B003',@budgetnum)>
        set @budgetcode='B003';
    else if CHARINDEX('B004',@budgetnum)>
        set @budgetcode='B004';
    else if CHARINDEX('B006',@budgetnum)>
        set @budgetcode='B006';
    else if CHARINDEX('B007',@budgetnum)>
        set @budgetcode='B007';
    else if CHARINDEX('B010',@budgetnum)>
        set @budgetcode='B010';
    else if CHARINDEX('B017',@budgetnum)>
        set @budgetcode='B017';
    else if CHARINDEX('B021',@budgetnum)>
        set @budgetcode='B021';
    else if CHARINDEX('B022',@budgetnum)>
        set @budgetcode='B022';
    else if CHARINDEX('B027',@budgetnum)>
        set @budgetcode='B027';
    else if CHARINDEX('B030',@budgetnum)>
        set @budgetcode='B030';
    else if CHARINDEX('B031',@budgetnum)>
        set @budgetcode='B031';
    else if CHARINDEX('B032',@budgetnum)>
        set @budgetcode='B032';
    else
        set @budgetcode='';
    end

    print @budgetcode;
    --抓取关联的维护表中会计号和科目
    begin
    if @Costcenter='销售费用'
        begin
        select @budgetItem=SellingCode,@Feecategory=SellingName from MT_BudgetFeeCategory where BudgetCode=@budgetcode;
        print @budgetItem;
        print @Feecategory;
        end
    else if @Costcenter='管理费用'
        begin
        select @budgetItem=GACode,@Feecategory=GAName from MT_BudgetFeeCategory where BudgetCode=@budgetcode;
        print @budgetItem;
        print @Feecategory;
        end
    else if @Costcenter='研发费用'
        begin
        select @budgetItem=RDCode,@Feecategory=RDName from MT_BudgetFeeCategory where BudgetCode=@budgetcode;
        print @budgetItem;
        print @Feecategory;
        end
    else if @Costcenter='制造费用'
        begin
        select @budgetItem=OverheadCode,@Feecategory=OverheadName from MT_BudgetFeeCategory where BudgetCode=@budgetcode;
        print @budgetItem;
        print @Feecategory;
        end
    else
        begin
        select @budgetItem='',@Feecategory='' from MT_BudgetFeeCategory where BudgetCode=@budgetcode;
        print @budgetItem;
        print @Feecategory;
        end
    end    

    UPDATE TS_ExpenseApplication_Reim_Detail SET BgCode= @budgetcode,BgItem=@budgetItem,BgCate=@Feecategory WHERE TaskID=@task;
    set @budgetcode='';
    set @Feecategory='';
    set @budgetItem='';
    SET ROWCOUNT 

    DELETE FROM dbo.tempExpense WHERE TaskID=@task;
END