ABAP Select data from SAP table /TDAG/GFWWIS_CUST_SYMBOL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /TDAG/GFWWIS_CUST_SYMBOL table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /TDAG/GFWWIS_CUST_SYMBOL. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /TDAG/GFWWIS_CUST_SYMBOL table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/TDAG/GFWWIS_CUST_SYMBOL TYPE STANDARD TABLE OF /TDAG/GFWWIS_CUST_SYMBOL,
      WA_/TDAG/GFWWIS_CUST_SYMBOL TYPE /TDAG/GFWWIS_CUST_SYMBOL,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </TDAG/GFWWIS_CUST_SYMBOL> TYPE /TDAG/GFWWIS_CUST_SYMBOL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/TDAG/GFWWIS_CUST_SYMBOL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /TDAG/GFWWIS_CUST_SYMBOL
  INTO TABLE IT_/TDAG/GFWWIS_CUST_SYMBOL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TDAG/GFWWIS_CUST_SYMBOL
*  INTO TABLE @DATA(IT_/TDAG/GFWWIS_CUST_SYMBOL2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/TDAG/GFWWIS_CUST_SYMBOL INDEX 1 INTO DATA(WA_/TDAG/GFWWIS_CUST_SYMBOL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/TDAG/GFWWIS_CUST_SYMBOL ASSIGNING </TDAG/GFWWIS_CUST_SYMBOL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TDAG/GFWWIS_CUST_SYMBOL>-MANDT = 1.
</TDAG/GFWWIS_CUST_SYMBOL>-LSYTYPE = 1.
</TDAG/GFWWIS_CUST_SYMBOL>-LSYID = 1.
</TDAG/GFWWIS_CUST_SYMBOL>-LSYGRP = 1.
</TDAG/GFWWIS_CUST_SYMBOL>-LSYFKOB = 1.

ENDLOOP.

LOOP AT IT_/TDAG/GFWWIS_CUST_SYMBOL INTO WA_/TDAG/GFWWIS_CUST_SYMBOL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/TDAG/GFWWIS_CUST_SYMBOL-LSYFKEL, sy-vline,
  WA_/TDAG/GFWWIS_CUST_SYMBOL-LSYFKPA, sy-vline,
  WA_/TDAG/GFWWIS_CUST_SYMBOL-ESTCAT, sy-vline,
  WA_/TDAG/GFWWIS_CUST_SYMBOL-LSYRTIM, sy-vline,
  WA_/TDAG/GFWWIS_CUST_SYMBOL-LSYRMOD, sy-vline,
  WA_/TDAG/GFWWIS_CUST_SYMBOL-LSYRPAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/TDAG/GFWWIS_CUST_SYMBOL you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/TDAG/GFWWIS_CUST_SYMBOL TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/TDAG/GFWWIS_CUST_SYMBOL INTO WA_/TDAG/GFWWIS_CUST_SYMBOL.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/GFWWIS_CUST_SYMBOL-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/GFWWIS_CUST_SYMBOL-LANGU.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/TDAG/GFWWIS_CUST_SYMBOL_STR, 
MANDT TYPE STRING,
LSYTYPE TYPE STRING,
LSYID TYPE STRING,
LSYGRP TYPE STRING,
LSYFKOB TYPE STRING,
LSYFKEL TYPE STRING,
LSYFKPA TYPE STRING,
ESTCAT TYPE STRING,
LSYRTIM TYPE STRING,
LSYRMOD TYPE STRING,
LSYRPAR TYPE STRING,
LSYRVAL TYPE STRING,
LSYUFLG TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
ATNAM TYPE STRING,
LMSGFLG TYPE STRING,
LANGU TYPE STRING,
LSYNAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TDAG/GFWWIS_CUST_SYMBOL_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-MANDT sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYTYPE sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYID sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYGRP sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYFKOB sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYFKEL sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYFKPA sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-ESTCAT sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYRTIM sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYRMOD sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYRPAR sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYRVAL sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYUFLG sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-TABNAME sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-FIELDNAME sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-KLART sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-CLASS sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-ATNAM sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LMSGFLG sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LANGU sy-vline 
WA_/TDAG/GFWWIS_CUST_SYMBOL_STR-LSYNAM sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.