ABAP Select data from SAP table ERCHV_INSTGR_DISP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERCHV_INSTGR_DISP
*  INTO TABLE @DATA(IT_ERCHV_INSTGR_DISP2).
*--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_ERCHV_INSTGR_DISP INDEX 1 INTO DATA(WA_ERCHV_INSTGR_DISP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERCHV_INSTGR_DISP>-BELNR = 1.
<ERCHV_INSTGR_DISP>-ANLAGE = 1.
<ERCHV_INSTGR_DISP>-INSTGRTYPE = 1.
<ERCHV_INSTGR_DISP>-INSTROLE = 1.
<ERCHV_INSTGR_DISP>-MAININST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERCHV_INSTGR_DISP-MAINDOCNO, sy-vline,
  WA_ERCHV_INSTGR_DISP-LFDNR, sy-vline,
  WA_ERCHV_INSTGR_DISP-AB, sy-vline,
  WA_ERCHV_INSTGR_DISP-BIS, sy-vline,
  WA_ERCHV_INSTGR_DISP-OPERAND, sy-vline,
  WA_ERCHV_INSTGR_DISP-I_ABRMENGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ERCHV_INSTGR_DISP 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_ERCHV_INSTGR_DISP 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_ERCHV_INSTGR_DISP INTO WA_ERCHV_INSTGR_DISP.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ERCHV_INSTGR_DISP-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERCHV_INSTGR_DISP-BELNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field SUBINST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ERCHV_INSTGR_DISP-SUBINST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERCHV_INSTGR_DISP-SUBINST.
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_ERCHV_INSTGR_DISP_STR, 
BELNR TYPE STRING,
ANLAGE TYPE STRING,
INSTGRTYPE TYPE STRING,
INSTROLE TYPE STRING,
MAININST TYPE STRING,
MAINDOCNO TYPE STRING,
LFDNR TYPE STRING,
AB TYPE STRING,
BIS TYPE STRING,
OPERAND TYPE STRING,
I_ABRMENGE TYPE STRING,
MSEH6 TYPE STRING,
NETTOBTR TYPE STRING,
TWAERS TYPE STRING,
SUBINST TYPE STRING,
SUBABRDATS TYPE STRING,
SUBABRVORG TYPE STRING,
TARGET_OP_MAIN1 TYPE STRING,
TM1_MSEH6 TYPE STRING,
TARGET_OP_MAIN2 TYPE STRING,
TM2_MSEH6 TYPE STRING,
TARGET_OP_MAIN3 TYPE STRING,
TM3_MSEH6 TYPE STRING,
TARGET_OP_SUB1 TYPE STRING,
TS1_MSEH6 TYPE STRING,
TARGET_OP_SUB2 TYPE STRING,
TS2_MSEH6 TYPE STRING,
TARGET_OP_SUB3 TYPE STRING,
TS3_MSEH6 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERCHV_INSTGR_DISP_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_ERCHV_INSTGR_DISP_STR-BELNR sy-vline 
WA_ERCHV_INSTGR_DISP_STR-ANLAGE sy-vline 
WA_ERCHV_INSTGR_DISP_STR-INSTGRTYPE sy-vline 
WA_ERCHV_INSTGR_DISP_STR-INSTROLE sy-vline 
WA_ERCHV_INSTGR_DISP_STR-MAININST sy-vline 
WA_ERCHV_INSTGR_DISP_STR-MAINDOCNO sy-vline 
WA_ERCHV_INSTGR_DISP_STR-LFDNR sy-vline 
WA_ERCHV_INSTGR_DISP_STR-AB sy-vline 
WA_ERCHV_INSTGR_DISP_STR-BIS sy-vline 
WA_ERCHV_INSTGR_DISP_STR-OPERAND sy-vline 
WA_ERCHV_INSTGR_DISP_STR-I_ABRMENGE sy-vline 
WA_ERCHV_INSTGR_DISP_STR-MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-NETTOBTR sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TWAERS sy-vline 
WA_ERCHV_INSTGR_DISP_STR-SUBINST sy-vline 
WA_ERCHV_INSTGR_DISP_STR-SUBABRDATS sy-vline 
WA_ERCHV_INSTGR_DISP_STR-SUBABRVORG sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_MAIN1 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TM1_MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_MAIN2 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TM2_MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_MAIN3 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TM3_MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_SUB1 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TS1_MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_SUB2 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TS2_MSEH6 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TARGET_OP_SUB3 sy-vline 
WA_ERCHV_INSTGR_DISP_STR-TS3_MSEH6 sy-vline      INTO ld_text SEPARATED BY SPACE.

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