动态创建临时表，插入到临时表中，然后选择 [英] Dynamically create temp table, insert into temp table, and then select

问题描述

基本上，我希望能够基于现有表动态创建临时表，然后将值插入到临时表中，然后选择插入的值.

Basically i want to be able to dynamically create a temp table based off of an existing table, and then insert values into the temp table, and select the inserted values.

我可以在其中创建临时表，可以很好地工作，只是插入和选择表格效果不佳.

i've got the part where i can create the temp table working just fine, it's just that inserting and selecting form it aren't working too well.

这是我当前的代码.

declare @table table 
(
    OrdinalPosition int, 
    ColumnName nvarchar(255), 
    DataType nvarchar(50), 
    MaxChar int, 
    Nullable nvarchar(5)
)
declare @i int
declare @count int
declare @colname nvarchar(255), @datatype nvarchar(50), @maxchar int
declare @string nvarchar(max)
declare @tblname nvarchar(100)

set @tblname='Projects'

set @string='create table #' + @tblname + ' ('

insert into @table 
(
    OrdinalPosition, 
    ColumnName, 
    DataType, 
    MaxChar, 
    Nullable
)

SELECT    
    ORDINAL_POSITION ,
    COLUMN_NAME ,
    DATA_TYPE ,
    CHARACTER_MAXIMUM_LENGTH ,
    IS_NULLABLE
FROM INFORMATION_SCHEMA.COLUMNS 
WHERE TABLE_NAME = @tblname

set @i=1
select @count=count(*) from @table

while (@i<=@count)
begin

    select @colname=ColumnName from @table where OrdinalPosition=@i
    select @datatype=DataType from @table where OrdinalPosition=@i
    select @maxchar=MaxChar from @table where OrdinalPosition=@i

    if (@maxchar is null)
    begin

        set @string = @string + @colname + ' ' + @datatype

    end
    else
    begin

        set @string = @string + @colname + ' ' + @datatype + '(' + cast(@maxchar as nvarchar(20)) + ')'

    end

    if (@i=@count)
    begin

        set @string = @string + ')'

    end
    else
    begin

        set @string = @string + ', '

    end


    set @i=@i+1
end

select @string

exec(@string)

set @string='
insert into #Projects (pk_prID, prWASSN_ID, prProjectStatus, prBusinessUnit, prServiceLine, prStudyTypeCode, prStudyNumber, prTimePoint, prStudyDirector, 
                      prGroupLeader, prBookedDate, prBookedAmount, prConsumed, prBudgetedHours, prFinalReport, prFinalYear, prFinalMonth, prStartQA, 
                      prLabWorkStarted, prLabWorkCompleted, prProjImpDate, prCompanyName, prCompanyNumber, prIsFTE, prRevisedDeadlineDate, prProjectFinalized, 
                      prBookedYear, prBookedMonth, prCRMQuoteID, prLineItemNumber, prDraftReport, prInternalTargetDeadlineDate, prProtocolSignedDate, 
                      prDataToRWS, prRWSWorkStarted, prFirstDraftToPL, prFirstDraftToQA, prArchivedDate, prToPLForQACommentReview, 
                      prAnticipatedProjectArchiveDate, prToQAWithPLCommentResponse, prProjectReactivatedDate, prQAFinishDate, prSecondDraftReportToClient)
select *
from cube.Projects'

select @string

exec (@string)

set @string='select * from #Projects'

exec (@string)

这是我得到的错误:

(受影响的44行)

(受影响的1行)

(受影响的1行) 消息208，级别16，状态0，第2行 无效的对象名称"#Projects". 消息208，级别16，状态0，第1行 无效的对象名称"#Projects".

(1 row(s) affected) Msg 208, Level 16, State 0, Line 2 Invalid object name '#Projects'. Msg 208, Level 16, State 0, Line 1 Invalid object name '#Projects'.

推荐答案

尝试使用两个##命名表，这将创建一个全局临时表.范围界定可能是一个问题，您可能正在使用exec创建表，但返回时看不到它.

Try to name the table with two ##, this will create a global temp table. It could be an issue with scoping, you might be creating the table with exec but it is not visible when it comes back.

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