ABAP Select data from SAP table REXC_CH_REIS_BU_L_APP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXC_CH_REIS_BU_L_APP
*  INTO TABLE @DATA(IT_REXC_CH_REIS_BU_L_APP2).
*--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_REXC_CH_REIS_BU_L_APP INDEX 1 INTO DATA(WA_REXC_CH_REIS_BU_L_APP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXC_CH_REIS_BU_L_APP>-EGID = 1.
<REXC_CH_REIS_BU_L_APP>-EDID = 1.
<REXC_CH_REIS_BU_L_APP>-STREETCH = 1.
<REXC_CH_REIS_BU_L_APP>-HOUSE_NUMCH = 1.
<REXC_CH_REIS_BU_L_APP>-POST_CODECH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXC_CH_REIS_BU_L_APP-CITYCH, sy-vline,
  WA_REXC_CH_REIS_BU_L_APP-XCOORD, sy-vline,
  WA_REXC_CH_REIS_BU_L_APP-XOBJCOND, sy-vline,
  WA_REXC_CH_REIS_BU_L_APP-XOBJCAT, sy-vline,
  WA_REXC_CH_REIS_BU_L_APP-XHEATINGTYPE, sy-vline,
  WA_REXC_CH_REIS_BU_L_APP-XENERGYHEAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXC_CH_REIS_BU_L_APP 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_REXC_CH_REIS_BU_L_APP 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_REXC_CH_REIS_BU_L_APP INTO WA_REXC_CH_REIS_BU_L_APP.


*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 EDID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REXC_CH_REIS_BU_L_APP-EDID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXC_CH_REIS_BU_L_APP-EDID.
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_REXC_CH_REIS_BU_L_APP_STR, 
EGID TYPE STRING,
EDID TYPE STRING,
STREETCH TYPE STRING,
HOUSE_NUMCH TYPE STRING,
POST_CODECH TYPE STRING,
CITYCH TYPE STRING,
XCOORD TYPE STRING,
XOBJCOND TYPE STRING,
XOBJCAT TYPE STRING,
XHEATINGTYPE TYPE STRING,
XENERGYHEAT TYPE STRING,
XENERGYWATER TYPE STRING,
XGEMEINDECH TYPE STRING,
XKREISCH TYPE STRING,
XREGIOCH TYPE STRING,
XSTOCKOCH TYPE STRING,
XSTOCKLCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXC_CH_REIS_BU_L_APP_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_REXC_CH_REIS_BU_L_APP_STR-EGID sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-EDID sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-STREETCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-HOUSE_NUMCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-POST_CODECH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-CITYCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XCOORD sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XOBJCOND sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XOBJCAT sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XHEATINGTYPE sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XENERGYHEAT sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XENERGYWATER sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XGEMEINDECH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XKREISCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XREGIOCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XSTOCKOCH sy-vline 
WA_REXC_CH_REIS_BU_L_APP_STR-XSTOCKLCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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