ABAP Select data from SAP table ECHDISP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ECHDISP
*  INTO TABLE @DATA(IT_ECHDISP2).
*--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_ECHDISP INDEX 1 INTO DATA(WA_ECHDISP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ECHDISP>-MANDT = 1.
<ECHDISP>-EVGRP = 1.
<ECHDISP>-REFTAB = 1.
<ECHDISP>-REFFIELD = 1.
<ECHDISP>-LENGTH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ECHDISP-CVSEQ, sy-vline,
  WA_ECHDISP-CVSUM, sy-vline,
  WA_ECHDISP-CVSORT, sy-vline,
  WA_ECHDISP-CVSORTYP, sy-vline,
  WA_ECHDISP-GRPIND, sy-vline,
  WA_ECHDISP-NVGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ECHDISP 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_ECHDISP 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_ECHDISP INTO WA_ECHDISP.


*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_ECHDISP_STR, 
MANDT TYPE STRING,
EVGRP TYPE STRING,
REFTAB TYPE STRING,
REFFIELD TYPE STRING,
LENGTH TYPE STRING,
CVSEQ TYPE STRING,
CVSUM TYPE STRING,
CVSORT TYPE STRING,
CVSORTYP TYPE STRING,
GRPIND TYPE STRING,
NVGRP TYPE STRING,
NVSEQ TYPE STRING,
NVSUM TYPE STRING,
NVSORT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ECHDISP_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_ECHDISP_STR-MANDT sy-vline 
WA_ECHDISP_STR-EVGRP sy-vline 
WA_ECHDISP_STR-REFTAB sy-vline 
WA_ECHDISP_STR-REFFIELD sy-vline 
WA_ECHDISP_STR-LENGTH sy-vline 
WA_ECHDISP_STR-CVSEQ sy-vline 
WA_ECHDISP_STR-CVSUM sy-vline 
WA_ECHDISP_STR-CVSORT sy-vline 
WA_ECHDISP_STR-CVSORTYP sy-vline 
WA_ECHDISP_STR-GRPIND sy-vline 
WA_ECHDISP_STR-NVGRP sy-vline 
WA_ECHDISP_STR-NVSEQ sy-vline 
WA_ECHDISP_STR-NVSUM sy-vline 
WA_ECHDISP_STR-NVSORT sy-vline      INTO ld_text SEPARATED BY SPACE.

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