ABAP Select data from SAP table MEREP_PERSON into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEREP_PERSON 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_PERSON. 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_PERSON 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_PERSON TYPE STANDARD TABLE OF MEREP_PERSON,
      WA_MEREP_PERSON TYPE MEREP_PERSON,
      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_PERSON> TYPE MEREP_PERSON.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREP_PERSON
*  INTO TABLE @DATA(IT_MEREP_PERSON2).
*--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_PERSON INDEX 1 INTO DATA(WA_MEREP_PERSON2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREP_PERSON>-MANDT = 1.
<MEREP_PERSON>-PERSNUMBER = 1.
<MEREP_PERSON>-FIRST_NAME = 1.
<MEREP_PERSON>-LAST_NAME = 1.
<MEREP_PERSON>-PROFESSION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEREP_PERSON-SEX, sy-vline,
  WA_MEREP_PERSON-BIRTHDAY, sy-vline,
  WA_MEREP_PERSON-WEIGHT, sy-vline,
  WA_MEREP_PERSON-HEIGHT, sy-vline,
  WA_MEREP_PERSON-CATEGORY1, sy-vline,
  WA_MEREP_PERSON-CATEGORY2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEREP_PERSON 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_PERSON 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_PERSON INTO WA_MEREP_PERSON.


*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_PERSON_STR, 
MANDT TYPE STRING,
PERSNUMBER TYPE STRING,
FIRST_NAME TYPE STRING,
LAST_NAME TYPE STRING,
PROFESSION TYPE STRING,
SEX TYPE STRING,
BIRTHDAY TYPE STRING,
WEIGHT TYPE STRING,
HEIGHT TYPE STRING,
CATEGORY1 TYPE STRING,
CATEGORY2 TYPE STRING,
CREDAT TYPE STRING,
CRENAM TYPE STRING,
CRETIM TYPE STRING,
CHGDAT TYPE STRING,
CHGNAM TYPE STRING,
CHGTIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREP_PERSON_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_PERSON_STR-MANDT sy-vline 
WA_MEREP_PERSON_STR-PERSNUMBER sy-vline 
WA_MEREP_PERSON_STR-FIRST_NAME sy-vline 
WA_MEREP_PERSON_STR-LAST_NAME sy-vline 
WA_MEREP_PERSON_STR-PROFESSION sy-vline 
WA_MEREP_PERSON_STR-SEX sy-vline 
WA_MEREP_PERSON_STR-BIRTHDAY sy-vline 
WA_MEREP_PERSON_STR-WEIGHT sy-vline 
WA_MEREP_PERSON_STR-HEIGHT sy-vline 
WA_MEREP_PERSON_STR-CATEGORY1 sy-vline 
WA_MEREP_PERSON_STR-CATEGORY2 sy-vline 
WA_MEREP_PERSON_STR-CREDAT sy-vline 
WA_MEREP_PERSON_STR-CRENAM sy-vline 
WA_MEREP_PERSON_STR-CRETIM sy-vline 
WA_MEREP_PERSON_STR-CHGDAT sy-vline 
WA_MEREP_PERSON_STR-CHGNAM sy-vline 
WA_MEREP_PERSON_STR-CHGTIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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