ABAP Select data from SAP table ECNSTRUCD 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 ECNSTRUCD 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 ECNSTRUCD. 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 ECNSTRUCD 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_ECNSTRUCD TYPE STANDARD TABLE OF ECNSTRUCD,
      WA_ECNSTRUCD TYPE ECNSTRUCD,
      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: <ECNSTRUCD> TYPE ECNSTRUCD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ECNSTRUCD
*  INTO TABLE @DATA(IT_ECNSTRUCD2).
*--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_ECNSTRUCD INDEX 1 INTO DATA(WA_ECNSTRUCD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ECNSTRUCD>-MANDT = 1.
<ECNSTRUCD>-CONFIG = 1.
<ECNSTRUCD>-PATHNO = 1.
<ECNSTRUCD>-OBJTYP = 1.
<ECNSTRUCD>-PARENTNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ECNSTRUCD-ROOTFLAG, sy-vline,
  WA_ECNSTRUCD-TYPATTRIB, sy-vline,
  WA_ECNSTRUCD-TYPCOLOR, sy-vline,
  WA_ECNSTRUCD-TYPINTENS, sy-vline,
  WA_ECNSTRUCD-SUPPRESS, sy-vline,
  WA_ECNSTRUCD-NODISPLAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ECNSTRUCD 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_ECNSTRUCD 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_ECNSTRUCD INTO WA_ECNSTRUCD.


*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_ECNSTRUCD_STR, 
MANDT TYPE STRING,
CONFIG TYPE STRING,
PATHNO TYPE STRING,
OBJTYP TYPE STRING,
PARENTNO TYPE STRING,
ROOTFLAG TYPE STRING,
TYPATTRIB TYPE STRING,
TYPCOLOR TYPE STRING,
TYPINTENS TYPE STRING,
SUPPRESS TYPE STRING,
NODISPLAY TYPE STRING,
EXPAND TYPE STRING,
ACTGRP TYPE STRING,
NAVATTRIB TYPE STRING,
TABFLAG TYPE STRING,
TABFROM TYPE STRING,
TABTO TYPE STRING,
LINKID TYPE STRING,
HISTORY TYPE STRING,
ATTRIB1 TYPE STRING,
COLOR1 TYPE STRING,
INTENSIV1 TYPE STRING,
LENGTH1 TYPE STRING,
ATTRIB2 TYPE STRING,
COLOR2 TYPE STRING,
INTENSIV2 TYPE STRING,
LENGTH2 TYPE STRING,
ATTRIB3 TYPE STRING,
COLOR3 TYPE STRING,
INTENSIV3 TYPE STRING,
LENGTH3 TYPE STRING,
ATTRIB4 TYPE STRING,
COLOR4 TYPE STRING,
INTENSIV4 TYPE STRING,
LENGTH4 TYPE STRING,
POS4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ECNSTRUCD_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_ECNSTRUCD_STR-MANDT sy-vline 
WA_ECNSTRUCD_STR-CONFIG sy-vline 
WA_ECNSTRUCD_STR-PATHNO sy-vline 
WA_ECNSTRUCD_STR-OBJTYP sy-vline 
WA_ECNSTRUCD_STR-PARENTNO sy-vline 
WA_ECNSTRUCD_STR-ROOTFLAG sy-vline 
WA_ECNSTRUCD_STR-TYPATTRIB sy-vline 
WA_ECNSTRUCD_STR-TYPCOLOR sy-vline 
WA_ECNSTRUCD_STR-TYPINTENS sy-vline 
WA_ECNSTRUCD_STR-SUPPRESS sy-vline 
WA_ECNSTRUCD_STR-NODISPLAY sy-vline 
WA_ECNSTRUCD_STR-EXPAND sy-vline 
WA_ECNSTRUCD_STR-ACTGRP sy-vline 
WA_ECNSTRUCD_STR-NAVATTRIB sy-vline 
WA_ECNSTRUCD_STR-TABFLAG sy-vline 
WA_ECNSTRUCD_STR-TABFROM sy-vline 
WA_ECNSTRUCD_STR-TABTO sy-vline 
WA_ECNSTRUCD_STR-LINKID sy-vline 
WA_ECNSTRUCD_STR-HISTORY sy-vline 
WA_ECNSTRUCD_STR-ATTRIB1 sy-vline 
WA_ECNSTRUCD_STR-COLOR1 sy-vline 
WA_ECNSTRUCD_STR-INTENSIV1 sy-vline 
WA_ECNSTRUCD_STR-LENGTH1 sy-vline 
WA_ECNSTRUCD_STR-ATTRIB2 sy-vline 
WA_ECNSTRUCD_STR-COLOR2 sy-vline 
WA_ECNSTRUCD_STR-INTENSIV2 sy-vline 
WA_ECNSTRUCD_STR-LENGTH2 sy-vline 
WA_ECNSTRUCD_STR-ATTRIB3 sy-vline 
WA_ECNSTRUCD_STR-COLOR3 sy-vline 
WA_ECNSTRUCD_STR-INTENSIV3 sy-vline 
WA_ECNSTRUCD_STR-LENGTH3 sy-vline 
WA_ECNSTRUCD_STR-ATTRIB4 sy-vline 
WA_ECNSTRUCD_STR-COLOR4 sy-vline 
WA_ECNSTRUCD_STR-INTENSIV4 sy-vline 
WA_ECNSTRUCD_STR-LENGTH4 sy-vline 
WA_ECNSTRUCD_STR-POS4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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