ABAP Select data from SAP table TA20NEGOF into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP TA20NEGOF 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 TA20NEGOF. 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 TA20NEGOF 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_TA20NEGOF TYPE STANDARD TABLE OF TA20NEGOF,
      WA_TA20NEGOF TYPE TA20NEGOF,
      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: <TA20NEGOF> TYPE TA20NEGOF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TA20NEGOF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TA20NEGOF
  INTO TABLE IT_TA20NEGOF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TA20NEGOF
*  INTO TABLE @DATA(IT_TA20NEGOF2).
*--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_TA20NEGOF INDEX 1 INTO DATA(WA_TA20NEGOF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TA20NEGOF ASSIGNING <TA20NEGOF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TA20NEGOF>-MANDT = 1.
<TA20NEGOF>-PROVIDER = 1.
<TA20NEGOF>-GEOORG_TYPE = 1.
<TA20NEGOF>-GEOORG = 1.
<TA20NEGOF>-GEODEST_TYPE = 1.

ENDLOOP.

LOOP AT IT_TA20NEGOF INTO WA_TA20NEGOF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TA20NEGOF-GEODEST, sy-vline,
  WA_TA20NEGOF-DIRECTIONALITY, sy-vline,
  WA_TA20NEGOF-FAREBASIS, sy-vline,
  WA_TA20NEGOF-ENDDA, sy-vline,
  WA_TA20NEGOF-BEGDA, sy-vline,
  WA_TA20NEGOF-FARETYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TA20NEGOF 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_TA20NEGOF 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_TA20NEGOF INTO WA_TA20NEGOF.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_TA20NEGOF_STR, 
MANDT TYPE STRING,
PROVIDER TYPE STRING,
GEOORG_TYPE TYPE STRING,
GEOORG TYPE STRING,
GEODEST_TYPE TYPE STRING,
GEODEST TYPE STRING,
DIRECTIONALITY TYPE STRING,
FAREBASIS TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
FARETYPE TYPE STRING,
FARENATURE TYPE STRING,
CORPID TYPE STRING,
PTC TYPE STRING,
PUSE TYPE STRING,
CABIN TYPE STRING,
CLASS TYPE STRING,
ROUTING TYPE STRING,
BASE_PRICE TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
MANDATORY_USE TYPE STRING,
FARE_INDEX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TA20NEGOF_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_TA20NEGOF_STR-MANDT sy-vline 
WA_TA20NEGOF_STR-PROVIDER sy-vline 
WA_TA20NEGOF_STR-GEOORG_TYPE sy-vline 
WA_TA20NEGOF_STR-GEOORG sy-vline 
WA_TA20NEGOF_STR-GEODEST_TYPE sy-vline 
WA_TA20NEGOF_STR-GEODEST sy-vline 
WA_TA20NEGOF_STR-DIRECTIONALITY sy-vline 
WA_TA20NEGOF_STR-FAREBASIS sy-vline 
WA_TA20NEGOF_STR-ENDDA sy-vline 
WA_TA20NEGOF_STR-BEGDA sy-vline 
WA_TA20NEGOF_STR-FARETYPE sy-vline 
WA_TA20NEGOF_STR-FARENATURE sy-vline 
WA_TA20NEGOF_STR-CORPID sy-vline 
WA_TA20NEGOF_STR-PTC sy-vline 
WA_TA20NEGOF_STR-PUSE sy-vline 
WA_TA20NEGOF_STR-CABIN sy-vline 
WA_TA20NEGOF_STR-CLASS sy-vline 
WA_TA20NEGOF_STR-ROUTING sy-vline 
WA_TA20NEGOF_STR-BASE_PRICE sy-vline 
WA_TA20NEGOF_STR-PRICE sy-vline 
WA_TA20NEGOF_STR-CURRENCY sy-vline 
WA_TA20NEGOF_STR-MANDATORY_USE sy-vline 
WA_TA20NEGOF_STR-FARE_INDEX sy-vline      INTO ld_text SEPARATED BY SPACE.

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