ABAP Select data from SAP table RKEA1 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 RKEA1 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 RKEA1. 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 RKEA1 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_RKEA1 TYPE STANDARD TABLE OF RKEA1,
      WA_RKEA1 TYPE RKEA1,
      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: <RKEA1> TYPE RKEA1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKEA1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKEA1
  INTO TABLE IT_RKEA1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKEA1
*  INTO TABLE @DATA(IT_RKEA12).
*--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_RKEA1 INDEX 1 INTO DATA(WA_RKEA12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKEA1 ASSIGNING <RKEA1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKEA1>-FIELDNAME = 1.
<RKEA1>-DATATYPE = 1.
<RKEA1>-LAENGE = 1.
<RKEA1>-SHORTTEXT = 1.
<RKEA1>-FIELDTEXT = 1.

ENDLOOP.

LOOP AT IT_RKEA1 INTO WA_RKEA1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKEA1-PFKST, sy-vline,
  WA_RKEA1-PFWEP, sy-vline,
  WA_RKEA1-MWKZ, sy-vline,
  WA_RKEA1-TABNAME, sy-vline,
  WA_RKEA1-ERKRS, sy-vline,
  WA_RKEA1-TEXT_SAVED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKEA1 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_RKEA1 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_RKEA1 INTO WA_RKEA1.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_RKEA1-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKEA1-DATATYPE.
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_RKEA1_STR, 
FIELDNAME TYPE STRING,
DATATYPE TYPE STRING,
LAENGE TYPE STRING,
SHORTTEXT TYPE STRING,
FIELDTEXT TYPE STRING,
PFKST TYPE STRING,
PFWEP TYPE STRING,
MWKZ TYPE STRING,
TABNAME TYPE STRING,
ERKRS TYPE STRING,
TEXT_SAVED TYPE STRING,
TEXT_STATE TYPE STRING,
APPLCLASS TYPE STRING,
SUBCLASS TYPE STRING,
BLOCKF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKEA1_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_RKEA1_STR-FIELDNAME sy-vline 
WA_RKEA1_STR-DATATYPE sy-vline 
WA_RKEA1_STR-LAENGE sy-vline 
WA_RKEA1_STR-SHORTTEXT sy-vline 
WA_RKEA1_STR-FIELDTEXT sy-vline 
WA_RKEA1_STR-PFKST sy-vline 
WA_RKEA1_STR-PFWEP sy-vline 
WA_RKEA1_STR-MWKZ sy-vline 
WA_RKEA1_STR-TABNAME sy-vline 
WA_RKEA1_STR-ERKRS sy-vline 
WA_RKEA1_STR-TEXT_SAVED sy-vline 
WA_RKEA1_STR-TEXT_STATE sy-vline 
WA_RKEA1_STR-APPLCLASS sy-vline 
WA_RKEA1_STR-SUBCLASS sy-vline 
WA_RKEA1_STR-BLOCKF sy-vline      INTO ld_text SEPARATED BY SPACE.

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