ABAP Select data from SAP table MEREP_401 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEREP_401 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 MEREP_401. 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 MEREP_401 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_MEREP_401 TYPE STANDARD TABLE OF MEREP_401,
      WA_MEREP_401 TYPE MEREP_401,
      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: <MEREP_401> TYPE MEREP_401.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MEREP_401.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MEREP_401
  INTO TABLE IT_MEREP_401.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREP_401
*  INTO TABLE @DATA(IT_MEREP_4012).
*--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_MEREP_401 INDEX 1 INTO DATA(WA_MEREP_4012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MEREP_401 ASSIGNING <MEREP_401>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREP_401>-SCENARIO = 1.
<MEREP_401>-OBJTYPE = 1.
<MEREP_401>-CREDAT = 1.
<MEREP_401>-CRENAM = 1.
<MEREP_401>-CRETIM = 1.

ENDLOOP.

LOOP AT IT_MEREP_401 INTO WA_MEREP_401.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEREP_401-CHGDAT, sy-vline,
  WA_MEREP_401-CHGNAM, sy-vline,
  WA_MEREP_401-CHGTIM, sy-vline,
  WA_MEREP_401-GENDAT, sy-vline,
  WA_MEREP_401-GENNAM, sy-vline,
  WA_MEREP_401-GENTIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEREP_401 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_MEREP_401 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_MEREP_401 INTO WA_MEREP_401.


*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_MEREP_401_STR, 
SCENARIO TYPE STRING,
OBJTYPE TYPE STRING,
CREDAT TYPE STRING,
CRENAM TYPE STRING,
CRETIM TYPE STRING,
CHGDAT TYPE STRING,
CHGNAM TYPE STRING,
CHGTIM TYPE STRING,
GENDAT TYPE STRING,
GENNAM TYPE STRING,
GENTIM TYPE STRING,
SAPRL TYPE STRING,
VERNUM TYPE STRING,
GENVER TYPE STRING,
RFCDEST TYPE STRING,
RFCFLAG TYPE STRING,
SYNCTYPE TYPE STRING,
EDITLOCK TYPE STRING,
TYPCHK TYPE STRING,
PUBLISH TYPE STRING,
FUNC_GROUP TYPE STRING,
ITEM_COMPARE TYPE STRING,
SYNTAX_ERROR TYPE STRING,
META_ERROR TYPE STRING,
PUSH_ENABLED TYPE STRING,
DEFAULT_IS_ASYNC TYPE STRING,
MASS_DATA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREP_401_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_MEREP_401_STR-SCENARIO sy-vline 
WA_MEREP_401_STR-OBJTYPE sy-vline 
WA_MEREP_401_STR-CREDAT sy-vline 
WA_MEREP_401_STR-CRENAM sy-vline 
WA_MEREP_401_STR-CRETIM sy-vline 
WA_MEREP_401_STR-CHGDAT sy-vline 
WA_MEREP_401_STR-CHGNAM sy-vline 
WA_MEREP_401_STR-CHGTIM sy-vline 
WA_MEREP_401_STR-GENDAT sy-vline 
WA_MEREP_401_STR-GENNAM sy-vline 
WA_MEREP_401_STR-GENTIM sy-vline 
WA_MEREP_401_STR-SAPRL sy-vline 
WA_MEREP_401_STR-VERNUM sy-vline 
WA_MEREP_401_STR-GENVER sy-vline 
WA_MEREP_401_STR-RFCDEST sy-vline 
WA_MEREP_401_STR-RFCFLAG sy-vline 
WA_MEREP_401_STR-SYNCTYPE sy-vline 
WA_MEREP_401_STR-EDITLOCK sy-vline 
WA_MEREP_401_STR-TYPCHK sy-vline 
WA_MEREP_401_STR-PUBLISH sy-vline 
WA_MEREP_401_STR-FUNC_GROUP sy-vline 
WA_MEREP_401_STR-ITEM_COMPARE sy-vline 
WA_MEREP_401_STR-SYNTAX_ERROR sy-vline 
WA_MEREP_401_STR-META_ERROR sy-vline 
WA_MEREP_401_STR-PUSH_ENABLED sy-vline 
WA_MEREP_401_STR-DEFAULT_IS_ASYNC sy-vline 
WA_MEREP_401_STR-MASS_DATA sy-vline      INTO ld_text SEPARATED BY SPACE.

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