How to write table name in SQL according to the user input

Question

hi
  i want to select data from a table , and the table name, field name is input by the user, for example, user input table name T1, field name F1 and i want to construct a SQL like select F1 into a_var from T1 . how does the SQL statement written? thanks for your advice.

Answer 1

hi
for ur requirement u should go for field sysmbols...
dynamic internal tables..
u can chk this....
TYPE-POOLS : slis.
PARAMETERS : p_struc LIKE dd02l-tabname.
DATA : it_fieldcat TYPE lvc_t_fcat,
        t_output TYPE REF TO data .
FIELD-SYMBOLS: <t_output> TYPE table ,
               <wa_output> TYPE ANY,
               <fval> TYPE ANY.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
EXPORTING
  I_BUFFER_ACTIVE              = I_BUFFER_ACTIVE
   i_structure_name             = p_struc
  I_CLIENT_NEVER_DISPLAY       = 'X'
  I_BYPASSING_BUFFER           = I_BYPASSING_BUFFER
  I_INTERNAL_TABNAME           = I_INTERNAL_TABNAME
  CHANGING
    ct_fieldcat                  = it_fieldcat
EXCEPTIONS
  INCONSISTENT_INTERFACE       = 1
  PROGRAM_ERROR                = 2
  OTHERS                       = 3
IF sy-subrc <> 0.
MESSAGE i000(bctrain) WITH 'MERGE FAILED'.
*ELSE.
MESSAGE i000(bctrain) WITH 'MERGE SUCCESS'.
ENDIF.
CREATE DATA t_newline LIKE LINE OF <t_dyntable>.
ASSIGN t_newline->* TO <fs_dyntable>.
CALL METHOD cl_alv_table_create=>create_dynamic_table
  EXPORTING
   I_STYLE_TABLE             =
    it_fieldcatalog           = it_fieldcat
   I_LENGTH_IN_BYTE          =
  IMPORTING
    ep_table                  = t_output
   E_STYLE_FNAME             =
  EXCEPTIONS
    generate_subpool_dir_full = 1
    OTHERS                    = 2
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
           WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ASSIGN t_output->* TO <t_output>.
SELECT * up to 10 rows FROM
   (p_struc)  INTO
   CORRESPONDING FIELDS OF
   TABLE <t_output>.
*write : / 'dynamic table created'.
LOOP AT <t_output> ASSIGNING  <wa_output>.
  DO.
    ASSIGN component sy-index of structure <wa_output> to <fval>.
    IF sy-subrc <> 0.
      WRITE : /.
      EXIT.
    ELSE.
      WRITE : <fval>.
    ENDIF.
  ENDDO.
ENDLOOP.
Message was edited by:
        Premalatha G