ABAP Select data from SAP table EREVHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREVHEADER
*  INTO TABLE @DATA(IT_EREVHEADER2).
*--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_EREVHEADER INDEX 1 INTO DATA(WA_EREVHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREVHEADER>-BSTYP = 1.
<EREVHEADER>-EDOKN = 1.
<EREVHEADER>-EDOKP = 1.
<EREVHEADER>-BSART = 1.
<EREVHEADER>-EKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREVHEADER-ACTIV, sy-vline,
  WA_EREVHEADER-EXIST, sy-vline,
  WA_EREVHEADER-ACTIVITY, sy-vline,
  WA_EREVHEADER-PREISANZ, sy-vline,
  WA_EREVHEADER-COMPLETE, sy-vline,
  WA_EREVHEADER-REVNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREVHEADER 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_EREVHEADER 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_EREVHEADER INTO WA_EREVHEADER.


*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_EREVHEADER-EDOKN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EREVHEADER-EDOKN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REVNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EREVHEADER-REVNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EREVHEADER-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_EREVHEADER_STR, 
BSTYP TYPE STRING,
EDOKN TYPE STRING,
EDOKP TYPE STRING,
BSART TYPE STRING,
EKORG TYPE STRING,
ACTIV TYPE STRING,
EXIST TYPE STRING,
ACTIVITY TYPE STRING,
PREISANZ TYPE STRING,
COMPLETE TYPE STRING,
REVNO TYPE STRING,
EXTREQ TYPE STRING,
ESTKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EREVHEADER_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_EREVHEADER_STR-BSTYP sy-vline 
WA_EREVHEADER_STR-EDOKN sy-vline 
WA_EREVHEADER_STR-EDOKP sy-vline 
WA_EREVHEADER_STR-BSART sy-vline 
WA_EREVHEADER_STR-EKORG sy-vline 
WA_EREVHEADER_STR-ACTIV sy-vline 
WA_EREVHEADER_STR-EXIST sy-vline 
WA_EREVHEADER_STR-ACTIVITY sy-vline 
WA_EREVHEADER_STR-PREISANZ sy-vline 
WA_EREVHEADER_STR-COMPLETE sy-vline 
WA_EREVHEADER_STR-REVNO sy-vline 
WA_EREVHEADER_STR-EXTREQ sy-vline 
WA_EREVHEADER_STR-ESTKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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