How to dynamically convert the return datatype of a procedure

Hi ,
I want to write a procedure which will take two argument.
one will be string and another one will be a out variable having dynamic return type based on the data in first passing parameter.
Description:
let suppose i have one table which has 3 column
1.String_col1 varchar2 (it will contain String combination of alphabets,numbers)
2.number_col2 varchar2 (it will contain numbers only)
3.date_col3 varchar2 (it will contain DATE)
All columns are having varchar2 as their datatype.(in sort all are String).
now i want to write a procedure which will convert the datatype of all the three columns into their respective datatypes i.e.
1.String_col1 varchar2
2.number_col2 number
3.date_col3 date
Note:I am passing only 1 column in procedure as IN parameter.I dont want to convert 1 row in their respective datatype.
Please let me know if you want any more information from my side.

I'm pretty sure that isn't possible.
What you could do is write a function to determine the datatype of the input, and use the return value of that function in either a decode or case statement to determine which of 3 explicitly defined functions to use.
Carl

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TYPES: begin of errmess,
        msgnr type t100-msgnr,
        text type t100-text,
       end of errmess.
TABLES : t100.
DATA: BEGIN OF DD_VA01,
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       KUNNR TYPE RV45A-KUNNR,
       BSTKD TYPE VBKD-BSTKD,
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       KWMENG(2) type C,
       KBETR(2) type C,
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DATA:IT_VA01     Like TABLE OF DD_VA01,
     WA_VA01     Like LINE OF IT_VA01,
     WA_VA01_F   Like LINE OF IT_VA01,
     IT_BDCDATA TYPE TABLE OF BDCDATA,
     WA_BDCDATA Like Line OF IT_BDCDATA,
     W_FNAME     TYPE STRING,
     messtab like bdcmsgcoll occurs 0 with header line,
     it_errmess type table of errmess,
     wa_errmess like line of it_errmess,
     err_message type string.
data: zf1 type i,
      zc1 type c value '2',
      fn(20) type c.
Main Code ************************************************************
PERFORM get_input using 'C:\Documents and Settings\ic881592\Desktop\Daran_bdc_VA01-e.txt'.
SORT IT_VA01 BY AUART KUNNR BSTKD.
LOOP AT IT_VA01 INTO WA_VA01.
if WA_VA01_F-AUART <> WA_VA01-AUART OR
     WA_VA01_F-KUNNR <> WA_VA01-KUNNR OR
     WA_VA01_F-BSTKD <> WA_VA01-BSTKD.
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       PERFORM create_bdc_header_data.
endif.
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ENDLOOP.
PERFORM call_transaction.
PERFORM errorlog.
Procedures ***********************************************************
form get_input using w_fname.
CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      FILENAME            = W_FNAME
      HAS_FIELD_SEPARATOR = '#'
    TABLES
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endform.
form call_transaction.
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FORM set_header_flag.
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FORM BDC_DYNPRO USING PROGRAM DYNPRO.
WA_BDCDATA-PROGRAM = PROGRAM.
WA_BDCDATA-DYNPRO   = DYNPRO.
WA_BDCDATA-DYNBEGIN = 'X'.
APPEND WA_BDCDATA TO IT_BDCDATA.
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FORM BDC_FIELD USING FNAM FVAL.
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CLEAR WA_BDCDATA.
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OR     2148     0001235     R-1162     7     12
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OR     2148     0001236     R-1162     8     17
OR     2148     0001236     R-1161     2     30
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