ABAP Select data from SAP table REQREF 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 REQREF 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 REQREF. 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 REQREF 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_REQREF TYPE STANDARD TABLE OF REQREF,
      WA_REQREF TYPE REQREF,
      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: <REQREF> TYPE REQREF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REQREF
*  INTO TABLE @DATA(IT_REQREF2).
*--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_REQREF INDEX 1 INTO DATA(WA_REQREF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REQREF>-CLIENT = 1.
<REQREF>-REQNO = 1.
<REQREF>-REQLLINE = 1.
<REQREF>-COUNTER = 1.
<REQREF>-REFTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REQREF-REFNUMBER, sy-vline,
  WA_REQREF-REFLINE, sy-vline,
  WA_REQREF-REFPACKNO, sy-vline,
  WA_REQREF-REFINTROW, sy-vline,
  WA_REQREF-REFSYSTEM, sy-vline,
  WA_REQREF-REFDEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REQREF 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_REQREF 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_REQREF INTO WA_REQREF.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LOGICAL_SYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REQREF-LOGICAL_SYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REQREF-LOGICAL_SYSTEM.
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_REQREF_STR, 
CLIENT TYPE STRING,
REQNO TYPE STRING,
REQLLINE TYPE STRING,
COUNTER TYPE STRING,
REFTYPE TYPE STRING,
REFNUMBER TYPE STRING,
REFLINE TYPE STRING,
REFPACKNO TYPE STRING,
REFINTROW TYPE STRING,
REFSYSTEM TYPE STRING,
REFDEST TYPE STRING,
REFSHEET_NO TYPE STRING,
LINE_TYPE TYPE STRING,
HEADER_BBP_GUID TYPE STRING,
ITEM_BBP_GUID TYPE STRING,
PARTNER TYPE STRING,
LOGICAL_SYSTEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REQREF_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_REQREF_STR-CLIENT sy-vline 
WA_REQREF_STR-REQNO sy-vline 
WA_REQREF_STR-REQLLINE sy-vline 
WA_REQREF_STR-COUNTER sy-vline 
WA_REQREF_STR-REFTYPE sy-vline 
WA_REQREF_STR-REFNUMBER sy-vline 
WA_REQREF_STR-REFLINE sy-vline 
WA_REQREF_STR-REFPACKNO sy-vline 
WA_REQREF_STR-REFINTROW sy-vline 
WA_REQREF_STR-REFSYSTEM sy-vline 
WA_REQREF_STR-REFDEST sy-vline 
WA_REQREF_STR-REFSHEET_NO sy-vline 
WA_REQREF_STR-LINE_TYPE sy-vline 
WA_REQREF_STR-HEADER_BBP_GUID sy-vline 
WA_REQREF_STR-ITEM_BBP_GUID sy-vline 
WA_REQREF_STR-PARTNER sy-vline 
WA_REQREF_STR-LOGICAL_SYSTEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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