ABAP Select data from SAP table ERCH_RIVA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERCH_RIVA
*  INTO TABLE @DATA(IT_ERCH_RIVA2).
*--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_ERCH_RIVA INDEX 1 INTO DATA(WA_ERCH_RIVA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERCH_RIVA>-MANDT = 1.
<ERCH_RIVA>-BELNR = 1.
<ERCH_RIVA>-BUKRS = 1.
<ERCH_RIVA>-SPARTE = 1.
<ERCH_RIVA>-GPARTNER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERCH_RIVA-VERTRAG, sy-vline,
  WA_ERCH_RIVA-ERDAT, sy-vline,
  WA_ERCH_RIVA-BUDAT, sy-vline,
  WA_ERCH_RIVA-ABRVORG, sy-vline,
  WA_ERCH_RIVA-ENDABRPE, sy-vline,
  WA_ERCH_RIVA-FAEDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ERCH_RIVA 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_ERCH_RIVA 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_ERCH_RIVA INTO WA_ERCH_RIVA.


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

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

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

*Conversion exit ALPHA, internal->external for field INTBELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ERCH_RIVA-INTBELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERCH_RIVA-INTBELNR.
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_ERCH_RIVA_STR, 
MANDT TYPE STRING,
BELNR TYPE STRING,
BUKRS TYPE STRING,
SPARTE TYPE STRING,
GPARTNER TYPE STRING,
VERTRAG TYPE STRING,
ERDAT TYPE STRING,
BUDAT TYPE STRING,
ABRVORG TYPE STRING,
ENDABRPE TYPE STRING,
FAEDAT TYPE STRING,
BERGRUND TYPE STRING,
STORNODAT TYPE STRING,
INTBELNR TYPE STRING,
BEGABRPE TYPE STRING,
SIMULATION TYPE STRING,
ZUORDDAA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERCH_RIVA_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_ERCH_RIVA_STR-MANDT sy-vline 
WA_ERCH_RIVA_STR-BELNR sy-vline 
WA_ERCH_RIVA_STR-BUKRS sy-vline 
WA_ERCH_RIVA_STR-SPARTE sy-vline 
WA_ERCH_RIVA_STR-GPARTNER sy-vline 
WA_ERCH_RIVA_STR-VERTRAG sy-vline 
WA_ERCH_RIVA_STR-ERDAT sy-vline 
WA_ERCH_RIVA_STR-BUDAT sy-vline 
WA_ERCH_RIVA_STR-ABRVORG sy-vline 
WA_ERCH_RIVA_STR-ENDABRPE sy-vline 
WA_ERCH_RIVA_STR-FAEDAT sy-vline 
WA_ERCH_RIVA_STR-BERGRUND sy-vline 
WA_ERCH_RIVA_STR-STORNODAT sy-vline 
WA_ERCH_RIVA_STR-INTBELNR sy-vline 
WA_ERCH_RIVA_STR-BEGABRPE sy-vline 
WA_ERCH_RIVA_STR-SIMULATION sy-vline 
WA_ERCH_RIVA_STR-ZUORDDAA sy-vline      INTO ld_text SEPARATED BY SPACE.

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