ABAP Select data from SAP table EREVDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREVDATA
*  INTO TABLE @DATA(IT_EREVDATA2).
*--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_EREVDATA INDEX 1 INTO DATA(WA_EREVDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREVDATA>-ERNAM = 1.
<EREVDATA>-ERDAT = 1.
<EREVDATA>-ERUHR = 1.
<EREVDATA>-FGNAM = 1.
<EREVDATA>-FGDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREVDATA-FGUHR, sy-vline,
  WA_EREVDATA-OKNAM, sy-vline,
  WA_EREVDATA-OKDAT, sy-vline,
  WA_EREVDATA-OKUHR, sy-vline,
  WA_EREVDATA-RSCOD, sy-vline,
  WA_EREVDATA-TXZ01, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREVDATA 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_EREVDATA 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_EREVDATA INTO WA_EREVDATA.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_EREVDATA_STR, 
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_EREVDATA_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_EREVDATA_STR-ERNAM sy-vline 
WA_EREVDATA_STR-ERDAT sy-vline 
WA_EREVDATA_STR-ERUHR sy-vline 
WA_EREVDATA_STR-FGNAM sy-vline 
WA_EREVDATA_STR-FGDAT sy-vline 
WA_EREVDATA_STR-FGUHR sy-vline 
WA_EREVDATA_STR-OKNAM sy-vline 
WA_EREVDATA_STR-OKDAT sy-vline 
WA_EREVDATA_STR-OKUHR sy-vline 
WA_EREVDATA_STR-RSCOD sy-vline 
WA_EREVDATA_STR-TXZ01 sy-vline 
WA_EREVDATA_STR-EXTNR sy-vline 
WA_EREVDATA_STR-CRNAM sy-vline 
WA_EREVDATA_STR-NETWR sy-vline 
WA_EREVDATA_STR-DIFWR sy-vline 
WA_EREVDATA_STR-WAERS sy-vline 
WA_EREVDATA_STR-BUDAT sy-vline 
WA_EREVDATA_STR-REVOK sy-vline 
WA_EREVDATA_STR-STREV sy-vline 
WA_EREVDATA_STR-LOEKZ sy-vline 
WA_EREVDATA_STR-BANPR sy-vline 
WA_EREVDATA_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.