ABAP Select data from SAP table E2PAD21 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2PAD21 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 E2PAD21. 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 E2PAD21 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_E2PAD21 TYPE STANDARD TABLE OF E2PAD21,
      WA_E2PAD21 TYPE E2PAD21,
      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: <E2PAD21> TYPE E2PAD21.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2PAD21.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2PAD21
  INTO TABLE IT_E2PAD21.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2PAD21
*  INTO TABLE @DATA(IT_E2PAD212).
*--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_E2PAD21 INDEX 1 INTO DATA(WA_E2PAD212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2PAD21 ASSIGNING <E2PAD21>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2PAD21>-MANDT = 1.
<E2PAD21>-PLVAR = 1.
<E2PAD21>-OTYPE = 1.
<E2PAD21>-OBJID = 1.
<E2PAD21>-INFTY = 1.

ENDLOOP.

LOOP AT IT_E2PAD21 INTO WA_E2PAD21.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2PAD21-RSIGN, sy-vline,
  WA_E2PAD21-RELAT, sy-vline,
  WA_E2PAD21-ISTAT, sy-vline,
  WA_E2PAD21-PRIOX, sy-vline,
  WA_E2PAD21-BEGDA, sy-vline,
  WA_E2PAD21-ENDDA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E2PAD21 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_E2PAD21 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_E2PAD21 INTO WA_E2PAD21.


*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_E2PAD21_STR, 
MANDT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
INFTY TYPE STRING,
RSIGN TYPE STRING,
RELAT TYPE STRING,
ISTAT TYPE STRING,
PRIOX TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
VARYF TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
REASN TYPE STRING,
HISTO TYPE STRING,
ITXNR TYPE STRING,
SCLAS TYPE STRING,
SOBID TYPE STRING,
PROZT TYPE STRING,
MANZL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E2PAD21_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_E2PAD21_STR-MANDT sy-vline 
WA_E2PAD21_STR-PLVAR sy-vline 
WA_E2PAD21_STR-OTYPE sy-vline 
WA_E2PAD21_STR-OBJID sy-vline 
WA_E2PAD21_STR-INFTY sy-vline 
WA_E2PAD21_STR-RSIGN sy-vline 
WA_E2PAD21_STR-RELAT sy-vline 
WA_E2PAD21_STR-ISTAT sy-vline 
WA_E2PAD21_STR-PRIOX sy-vline 
WA_E2PAD21_STR-BEGDA sy-vline 
WA_E2PAD21_STR-ENDDA sy-vline 
WA_E2PAD21_STR-VARYF sy-vline 
WA_E2PAD21_STR-SEQNR sy-vline 
WA_E2PAD21_STR-AEDTM sy-vline 
WA_E2PAD21_STR-UNAME sy-vline 
WA_E2PAD21_STR-REASN sy-vline 
WA_E2PAD21_STR-HISTO sy-vline 
WA_E2PAD21_STR-ITXNR sy-vline 
WA_E2PAD21_STR-SCLAS sy-vline 
WA_E2PAD21_STR-SOBID sy-vline 
WA_E2PAD21_STR-PROZT sy-vline 
WA_E2PAD21_STR-MANZL sy-vline      INTO ld_text SEPARATED BY SPACE.

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