Update DB values bases on variable expression

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employeeid  employee salaryheadid actualformula   formula     type    abb  rate         
----------- --------------------------------------------------------------------
96          rakesh    5            {1}-{2}      {Basic}-{Bus}  +      rajj  null

employeeid  salaryheadid abb                    rate
----------- ------------ ---------------------- ---------------------
96          1            Basic                  336.6667
96          2            Bus                    10.00

salaryheadid   abb
-------------- ----------
1              Basic
2              Bus
3              Other
4              TDS
5              rajj
6              tax
7              mmm

here is 3 tables in table 1 rate for employeeid=96 is null,.
i want to set its value= 336.6667 - 10 =326.6667.
the formula is coming from another tabel p_formula. it may be anything.
basic * bus or anything else.
can anyone plz help me.,.
plz give sol in asp with vb....

[edit]Code block added, title updated - OriginalGriff[/edit]

Posted 6-Oct-13 22:26pm

rajveer344

Updated 6-Oct-13 22:33pm

OriginalGriff

v3

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OriginalGriff 7-Oct-13 4:33am

Changed question title to meaningful description. Please do not use "please help me" or similar as it does not tell potential answerers what your problem is - that wastes time if they (in this case) know nothing about threading. If you use a more descriptive title, you will get better focussed responses.

rajveer344 7-Oct-13 4:35am

ok

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OriginalGriff · Answer 1 · 2013-10-06T22:43:00

If you mean that you have a text-based column in a different table that contains a list of expressions you could apply to the field, then you will need to read that into a string, and build a new SQL statement from it, then execute that. So if for example you had p_formula:

Id    Exp
1     rate-10
2     rate+10
3     rate*5

Then:

SQL

DECLARE @Cmd VARCHAR(MAX)
DECLARE @Exp VARCHAR(MAX)
SET @Exp = SELECT Exp FROM p_formula WHERE Id=1
SET @Cmd = 'UPDATE MyTable SET rate=''' + @EXP + ''' WHERE employeeID=96 AND abb=''Basic'''
Exec(@Cmd)

That probably won't do what you want exactly, but I don't fully understand your thinking here - it seems like a very odd way to do things, which means there is probably a much, much better way to get the result you want - but it gives you the general idea.