ABAP Select data from SAP table ETRG into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ETRG 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 ETRG. 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 ETRG 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_ETRG TYPE STANDARD TABLE OF ETRG,
      WA_ETRG TYPE ETRG,
      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: <ETRG> TYPE ETRG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ETRG
*  INTO TABLE @DATA(IT_ETRG2).
*--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_ETRG INDEX 1 INTO DATA(WA_ETRG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ETRG>-MANDT = 1.
<ETRG>-ANLAGE = 1.
<ETRG>-ABRDATS = 1.
<ETRG>-ABRVORG = 1.
<ETRG>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ETRG-SPARTE, sy-vline,
  WA_ETRG-PORTION, sy-vline,
  WA_ETRG-ABRVORG2, sy-vline,
  WA_ETRG-TRIGSTAT, sy-vline,
  WA_ETRG-ABLEINH, sy-vline,
  WA_ETRG-ADATSOLL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ETRG 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_ETRG 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_ETRG INTO WA_ETRG.


*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 ALPHA, internal->external for field ANLAGE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ETRG-ANLAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETRG-ANLAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SC_BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ETRG-SC_BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETRG-SC_BELNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MEM_OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ETRG-MEM_OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETRG-MEM_OPBEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MAINDOCNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ETRG-MAINDOCNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETRG-MAINDOCNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ETRG-VKONTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETRG-VKONTO.
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_ETRG_STR, 
MANDT TYPE STRING,
ANLAGE TYPE STRING,
ABRDATS TYPE STRING,
ABRVORG TYPE STRING,
BUKRS TYPE STRING,
SPARTE TYPE STRING,
PORTION TYPE STRING,
ABRVORG2 TYPE STRING,
TRIGSTAT TYPE STRING,
ABLEINH TYPE STRING,
ADATSOLL TYPE STRING,
ABRDATSU TYPE STRING,
ABRVORGU TYPE STRING,
BEGEND TYPE STRING,
SC_BELNR TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
ENDPRIO TYPE STRING,
ABSCHLPAN TYPE STRING,
ZUORDDAT TYPE STRING,
MEM_OPBEL TYPE STRING,
MEM_BUDAT TYPE STRING,
ADATSOLLU TYPE STRING,
ESTINBILL TYPE STRING,
ESTINBILLU TYPE STRING,
ESTINBILL_SAV TYPE STRING,
ESTINBILL_USAV TYPE STRING,
OSB_GROUP TYPE STRING,
MAINDOCNO TYPE STRING,
WAIT_BI TYPE STRING,
VKONTO TYPE STRING,
MDUSREQUESTID TYPE STRING,
MDUSRQSTAT TYPE STRING,
COLOGRP_INST TYPE STRING,
BILLG_ERR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ETRG_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_ETRG_STR-MANDT sy-vline 
WA_ETRG_STR-ANLAGE sy-vline 
WA_ETRG_STR-ABRDATS sy-vline 
WA_ETRG_STR-ABRVORG sy-vline 
WA_ETRG_STR-BUKRS sy-vline 
WA_ETRG_STR-SPARTE sy-vline 
WA_ETRG_STR-PORTION sy-vline 
WA_ETRG_STR-ABRVORG2 sy-vline 
WA_ETRG_STR-TRIGSTAT sy-vline 
WA_ETRG_STR-ABLEINH sy-vline 
WA_ETRG_STR-ADATSOLL sy-vline 
WA_ETRG_STR-ABRDATSU sy-vline 
WA_ETRG_STR-ABRVORGU sy-vline 
WA_ETRG_STR-BEGEND sy-vline 
WA_ETRG_STR-SC_BELNR sy-vline 
WA_ETRG_STR-ERDAT sy-vline 
WA_ETRG_STR-ERNAM sy-vline 
WA_ETRG_STR-AEDAT sy-vline 
WA_ETRG_STR-AENAM sy-vline 
WA_ETRG_STR-ENDPRIO sy-vline 
WA_ETRG_STR-ABSCHLPAN sy-vline 
WA_ETRG_STR-ZUORDDAT sy-vline 
WA_ETRG_STR-MEM_OPBEL sy-vline 
WA_ETRG_STR-MEM_BUDAT sy-vline 
WA_ETRG_STR-ADATSOLLU sy-vline 
WA_ETRG_STR-ESTINBILL sy-vline 
WA_ETRG_STR-ESTINBILLU sy-vline 
WA_ETRG_STR-ESTINBILL_SAV sy-vline 
WA_ETRG_STR-ESTINBILL_USAV sy-vline 
WA_ETRG_STR-OSB_GROUP sy-vline 
WA_ETRG_STR-MAINDOCNO sy-vline 
WA_ETRG_STR-WAIT_BI sy-vline 
WA_ETRG_STR-VKONTO sy-vline 
WA_ETRG_STR-MDUSREQUESTID sy-vline 
WA_ETRG_STR-MDUSRQSTAT sy-vline 
WA_ETRG_STR-COLOGRP_INST sy-vline 
WA_ETRG_STR-BILLG_ERR sy-vline      INTO ld_text SEPARATED BY SPACE.

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