ABAP Select data from SAP table REDS_LOADGEN_L 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 REDS_LOADGEN_L 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 REDS_LOADGEN_L. 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 REDS_LOADGEN_L 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_REDS_LOADGEN_L TYPE STANDARD TABLE OF REDS_LOADGEN_L,
      WA_REDS_LOADGEN_L TYPE REDS_LOADGEN_L,
      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: <REDS_LOADGEN_L> TYPE REDS_LOADGEN_L.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REDS_LOADGEN_L
*  INTO TABLE @DATA(IT_REDS_LOADGEN_L2).
*--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_REDS_LOADGEN_L INDEX 1 INTO DATA(WA_REDS_LOADGEN_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REDS_LOADGEN_L>-PGMID = 1.
<REDS_LOADGEN_L>-OBJECT = 1.
<REDS_LOADGEN_L>-OBJNAME = 1.
<REDS_LOADGEN_L>-NAME = 1.
<REDS_LOADGEN_L>-COMPONENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REDS_LOADGEN_L-GENSTATUS, sy-vline,
  WA_REDS_LOADGEN_L-STATUSGEN, sy-vline,
  WA_REDS_LOADGEN_L-RFCHOST, sy-vline,
  WA_REDS_LOADGEN_L-GENTIME, sy-vline,
  WA_REDS_LOADGEN_L-TASKNUMBER, sy-vline,
  WA_REDS_LOADGEN_L-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REDS_LOADGEN_L 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_REDS_LOADGEN_L 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_REDS_LOADGEN_L INTO WA_REDS_LOADGEN_L.


*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_REDS_LOADGEN_L_STR, 
PGMID TYPE STRING,
OBJECT TYPE STRING,
OBJNAME TYPE STRING,
NAME TYPE STRING,
COMPONENT TYPE STRING,
GENSTATUS TYPE STRING,
STATUSGEN TYPE STRING,
RFCHOST TYPE STRING,
GENTIME TYPE STRING,
TASKNUMBER TYPE STRING,
STATUS TYPE STRING,
INFOTEXT TYPE STRING,
COLOR TYPE STRING,
GENNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REDS_LOADGEN_L_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_REDS_LOADGEN_L_STR-PGMID sy-vline 
WA_REDS_LOADGEN_L_STR-OBJECT sy-vline 
WA_REDS_LOADGEN_L_STR-OBJNAME sy-vline 
WA_REDS_LOADGEN_L_STR-NAME sy-vline 
WA_REDS_LOADGEN_L_STR-COMPONENT sy-vline 
WA_REDS_LOADGEN_L_STR-GENSTATUS sy-vline 
WA_REDS_LOADGEN_L_STR-STATUSGEN sy-vline 
WA_REDS_LOADGEN_L_STR-RFCHOST sy-vline 
WA_REDS_LOADGEN_L_STR-GENTIME sy-vline 
WA_REDS_LOADGEN_L_STR-TASKNUMBER sy-vline 
WA_REDS_LOADGEN_L_STR-STATUS sy-vline 
WA_REDS_LOADGEN_L_STR-INFOTEXT sy-vline 
WA_REDS_LOADGEN_L_STR-COLOR sy-vline 
WA_REDS_LOADGEN_L_STR-GENNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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