ABAP Select data from SAP table REXCHUINV_L into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXCHUINV_L
*  INTO TABLE @DATA(IT_REXCHUINV_L2).
*--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_REXCHUINV_L INDEX 1 INTO DATA(WA_REXCHUINV_L2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXCHUINV_L>-BUKRS = 1.
<REXCHUINV_L>-RECNNR = 1.
<REXCHUINV_L>-PSTNGPROCEDURE = 1.
<REXCHUINV_L>-PROCESS = 1.
<REXCHUINV_L>-PROCESSID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXCHUINV_L-BELNR, sy-vline,
  WA_REXCHUINV_L-FISC_YEAR, sy-vline,
  WA_REXCHUINV_L-PSTNGPERIOD, sy-vline,
  WA_REXCHUINV_L-INVNO, sy-vline,
  WA_REXCHUINV_L-PARTNER, sy-vline,
  WA_REXCHUINV_L-PARTNERNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXCHUINV_L 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_REXCHUINV_L 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_REXCHUINV_L INTO WA_REXCHUINV_L.


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

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

*Conversion exit GJAHR, internal->external for field FISC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_REXCHUINV_L-FISC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCHUINV_L-FISC_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REXCHUINV_L-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXCHUINV_L-PARTNER.
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_REXCHUINV_L_STR, 
BUKRS TYPE STRING,
RECNNR TYPE STRING,
PSTNGPROCEDURE TYPE STRING,
PROCESS TYPE STRING,
PROCESSID TYPE STRING,
BELNR TYPE STRING,
FISC_YEAR TYPE STRING,
PSTNGPERIOD TYPE STRING,
INVNO TYPE STRING,
PARTNER TYPE STRING,
PARTNERNAME TYPE STRING,
STATUS TYPE STRING,
STATUSSHORT TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
REFDOCID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXCHUINV_L_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_REXCHUINV_L_STR-BUKRS sy-vline 
WA_REXCHUINV_L_STR-RECNNR sy-vline 
WA_REXCHUINV_L_STR-PSTNGPROCEDURE sy-vline 
WA_REXCHUINV_L_STR-PROCESS sy-vline 
WA_REXCHUINV_L_STR-PROCESSID sy-vline 
WA_REXCHUINV_L_STR-BELNR sy-vline 
WA_REXCHUINV_L_STR-FISC_YEAR sy-vline 
WA_REXCHUINV_L_STR-PSTNGPERIOD sy-vline 
WA_REXCHUINV_L_STR-INVNO sy-vline 
WA_REXCHUINV_L_STR-PARTNER sy-vline 
WA_REXCHUINV_L_STR-PARTNERNAME sy-vline 
WA_REXCHUINV_L_STR-STATUS sy-vline 
WA_REXCHUINV_L_STR-STATUSSHORT sy-vline 
WA_REXCHUINV_L_STR-RERF sy-vline 
WA_REXCHUINV_L_STR-DERF sy-vline 
WA_REXCHUINV_L_STR-TERF sy-vline 
WA_REXCHUINV_L_STR-REHER sy-vline 
WA_REXCHUINV_L_STR-RBEAR sy-vline 
WA_REXCHUINV_L_STR-DBEAR sy-vline 
WA_REXCHUINV_L_STR-TBEAR sy-vline 
WA_REXCHUINV_L_STR-RBHER sy-vline 
WA_REXCHUINV_L_STR-REFDOCID sy-vline      INTO ld_text SEPARATED BY SPACE.

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