ABAP Select data from SAP table EREV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREV
*  INTO TABLE @DATA(IT_EREV2).
*--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_EREV INDEX 1 INTO DATA(WA_EREV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREV>-MANDT = 1.
<EREV>-BSTYP = 1.
<EREV>-EDOKN = 1.
<EREV>-EDOKP = 1.
<EREV>-REVNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREV-ERNAM, sy-vline,
  WA_EREV-ERDAT, sy-vline,
  WA_EREV-ERUHR, sy-vline,
  WA_EREV-FGNAM, sy-vline,
  WA_EREV-FGDAT, sy-vline,
  WA_EREV-FGUHR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREV 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_EREV 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_EREV INTO WA_EREV.


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

*Conversion exit ALPHA, internal->external for field REVNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EREV-REVNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EREV-REVNO.
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_EREV_STR, 
MANDT TYPE STRING,
BSTYP TYPE STRING,
EDOKN TYPE STRING,
EDOKP TYPE STRING,
REVNO TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERUHR TYPE STRING,
FGNAM TYPE STRING,
FGDAT TYPE STRING,
FGUHR TYPE STRING,
OKNAM TYPE STRING,
OKDAT TYPE STRING,
OKUHR TYPE STRING,
RSCOD TYPE STRING,
TXZ01 TYPE STRING,
EXTNR TYPE STRING,
CRNAM TYPE STRING,
NETWR TYPE STRING,
DIFWR TYPE STRING,
WAERS TYPE STRING,
BUDAT TYPE STRING,
REVOK TYPE STRING,
STREV TYPE STRING,
LOEKZ TYPE STRING,
BANPR TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EREV_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_EREV_STR-MANDT sy-vline 
WA_EREV_STR-BSTYP sy-vline 
WA_EREV_STR-EDOKN sy-vline 
WA_EREV_STR-EDOKP sy-vline 
WA_EREV_STR-REVNO sy-vline 
WA_EREV_STR-ERNAM sy-vline 
WA_EREV_STR-ERDAT sy-vline 
WA_EREV_STR-ERUHR sy-vline 
WA_EREV_STR-FGNAM sy-vline 
WA_EREV_STR-FGDAT sy-vline 
WA_EREV_STR-FGUHR sy-vline 
WA_EREV_STR-OKNAM sy-vline 
WA_EREV_STR-OKDAT sy-vline 
WA_EREV_STR-OKUHR sy-vline 
WA_EREV_STR-RSCOD sy-vline 
WA_EREV_STR-TXZ01 sy-vline 
WA_EREV_STR-EXTNR sy-vline 
WA_EREV_STR-CRNAM sy-vline 
WA_EREV_STR-NETWR sy-vline 
WA_EREV_STR-DIFWR sy-vline 
WA_EREV_STR-WAERS sy-vline 
WA_EREV_STR-BUDAT sy-vline 
WA_EREV_STR-REVOK sy-vline 
WA_EREV_STR-STREV sy-vline 
WA_EREV_STR-LOEKZ sy-vline 
WA_EREV_STR-BANPR sy-vline 
WA_EREV_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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