Help: about Dynamic Table field name

[Former Member]

Hi Everyone first thanx for answering my first question in this forum.

i try to explain the situation clearly

i use a parameter to get an input table name, it can be CAWN, can be MARA, can be MVKE,

then i need to check whether in this table whether there is a colume/field called MatNr or Werks...

if so ... Process A

if not ... Process B

how can i get the name of fields.(not the data content)

i think i should use fieldsymbol or something alike, anyone has a good example or idea?

thanx!!!

[Former Member]

Use FM NAMETAB_GET and you will get the list of table fields.

[Former Member]

Hi Yunfan,

You can acheive this by using field symbols.

You need to declare two field symbols.

FIELD_SYMBOLS: <fs1> TYPE "Your internal table.
FIELD_SYMBOLS: <fs2> TYPE any

Then, You need to use the statement

ASSIGN COMPONENT 'FIELD NAME' OF STRUCTURE <FS1> TO <FS2>

- Check help for proper syntax

If this ASSIGNMENT is succcessful, this means the field that you are looking for is existing.

If the assignment is not successful, the field does not exist.

Hope this solves your query.

Best Regards,

Ram.

[Former Member]

really interested in ur answer

FIELD_SYMBOLS: <fs1> TYPE "Your internal table.

but problem is i got my type from an input through parameter, it can be mvke, mara, cawn, or ...

how can i define <fs1> using a dynamic?.

[Former Member]

here is my codes

PARAMETERS p_mat1 TYPE mara-matnr.

PARAMETERS p_mat2 type mara-matnr.

parameters p_tab(20) type c.

FIELD-SYMBOLS: <tab1> like p_tab,

<tab2> type any,

<wa> type any.

ASSIGN COMPONENT 'MATNR' OF STRUCTURE <tab1> TO <tab2>.

but the sy-subrc after this always 4 , even if i set p_tab = mvke

why???

[Former Member]

Hi

U can use fm DDIF_FIELDINFO_GET in order to find out the name of the fields of a dictionary table.

If you're working on realese => 4.7:

PARAMETERS: P_TABLE(30).

DATA: MY_TABLE TYPE  REF TO DATA,
           WA_TABLE TYPE REF TO DATA.

FIELD-SYMBOLS: <MY_TABLE> TYPE TABLE,
                             <WA_TABLE> TYPE TABLE.

* Create an internal table (this command works from rel 47)
CREATA DATA MY_TABLE TYPE TABLE OF (P_TABLE).
ASSIGN MY_TABLE->* TO <MY_TABLE>.

* Create a work area
CREATA DATA WA_TABLE TYPE (P_TABLE).
ASSIGN WA_TABLE->* TO <WA_TABLE>.

Max

[Former Member]

hi, thanx for replying

CREATA DATA MY_TABLE TYPE TABLE OF (P_TABLE).

ASSIGN MY_TABLE->* TO <MY_TABLE>.

• Create a work area

CREATA DATA WA_TABLE TYPE (P_TABLE).

ASSIGN WA_TABLE->* TO <WA_TABLE>.

then how to prove if in this p_table has a field called matnr or not?

[Former Member]

Hi

If yuo need to know if a table has field called MATNR, you don't need to use field-symbols:

PARAMETERS: P_TABLE TYPE  DDOBJNAME.

START-OF-SELECTION.

  CALL FUNCTION 'DDIF_FIELDINFO_GET'
       EXPORTING
            TABNAME        = P_TABLE
            FIELDNAME      = 'MATNR'
       EXCEPTIONS
            NOT_FOUND      = 1
            INTERNAL_ERROR = 2
            OTHERS         = 3.
  IF SY-SUBRC <> 0.
    WRITE: 'No field called MATNR'.
  ELSE.
    WRITE: 'Ok field called MATNR'.
  ENDIF.

But if you wan to use field-symbols:

PARAMETERS: P_TABLE TYPE  DDOBJNAME.

FIELD-SYMBOLS: <WA>    TYPE ANY,
               <MATNR> TYPE ANY.

DATA: WA TYPE REF TO DATA.

START-OF-SELECTION.

  CREATE DATA WA TYPE (P_TABLE).
  ASSIGN WA->* TO <WA>.

  ASSIGN COMPONENT 'MATNR' OF STRUCTURE <WA> TO <MATNR>.
  IF SY-SUBRC = 0.
    WRITE: 'Ok field called MATNR'.
  ELSE.
    WRITE: 'No field called MATNR'.
  ENDIF.

Max

[Former Member]

Hi,

your report contain varying number of columns in the output ?

If yes then only you require dynamic table logic.

Else you can use Case statement or if statement according to the requirement.

If table = CAWN

Check for the fields in the table

if sy-subrc = 0.

Process A.

else.

Process B.

endif.

endif.

Thanks.

[dev_parbutteea]

Hi,

please use the following:

data:i_table_fieldlist like ddfield occurs 0 with header line.

• Getting all fields of the specified table in internal table

call function 'DD_NAMETAB_TO_DDFIELDS'

exporting

tabname = <<---- table name

tables

ddfields = i_table_fieldlist.

then do 2 read table i_table_fieldlist with key FIELDNAME = matnr/werks.

Thanks and Regards,

Dev

[Former Member]

Hi,

FIELD-SYMBOLS:<l_fs_dyn> TYPE ANY.

ASSIGN COMPONENT ls_fcat1-fieldname

OF STRUCTURE <dyn_wa> TO <l_fs_dyn>.

Thanks & Regards,

Krishna...

[dev_parbutteea]

Hi Yunfan,

Maybe a simpler way would be :

parameters p_tab TYPE dd03l-TABNAME .

select count(*)

from dd03l

where TABNAME = p_tab

and fieldname in ('MATNR', 'WERKS').

IF sy-subrc = 0.

write: 'field exists in table', p_tab.

ENDIF.

Thanks and regards,

Dev.