动态创建临时表,插入临时表,然后选择

Question

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

我有一个部分,我可以创建临时表工作得很好,只是插入和选择形式它不是很好.

这是我目前的代码.

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:

(44行受影响)

(1排受影响)

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

Answer 1

尝试用两个##命名表,这将创建一个全局临时表.这可能是范围界定的问题,您可能正在使用exec创建表,但它在返回时不可见.

Answer 2

当你调用exec时我相信它在你的临时表被声明的上下文之外执行我相信如果你把你的字符串附加在一起并执行一次调用exec就会成功.另一种选择是使用全局临时表,其中##作为前缀而不是#.