ABAP Select data from SAP table MERGEMAPS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MERGEMAPS
*  INTO TABLE @DATA(IT_MERGEMAPS2).
*--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_MERGEMAPS INDEX 1 INTO DATA(WA_MERGEMAPS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MERGEMAPS>-MAPNAME = 1.
<MERGEMAPS>-TARTYPE = 1.
<MERGEMAPS>-PREFIX = 1.
<MERGEMAPS>-LOGPATH = 1.
<MERGEMAPS>-LOGTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MERGEMAPS-CREATEUSER, sy-vline,
  WA_MERGEMAPS-CREATEDATE, sy-vline,
  WA_MERGEMAPS-CREATETIME, sy-vline,
  WA_MERGEMAPS-CHANGEUSER, sy-vline,
  WA_MERGEMAPS-CHANGEDATE, sy-vline,
  WA_MERGEMAPS-CHANGETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MERGEMAPS 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_MERGEMAPS 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_MERGEMAPS INTO WA_MERGEMAPS.


*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_MERGEMAPS_STR, 
MAPNAME TYPE STRING,
TARTYPE TYPE STRING,
PREFIX TYPE STRING,
LOGPATH TYPE STRING,
LOGTYPE TYPE STRING,
CREATEUSER TYPE STRING,
CREATEDATE TYPE STRING,
CREATETIME TYPE STRING,
CHANGEUSER TYPE STRING,
CHANGEDATE TYPE STRING,
CHANGETIME TYPE STRING,
LIMUCONV TYPE STRING,
MERGEINCOMPLETE TYPE STRING,
MAPTEXT TYPE STRING,
IGNOREDOBJS TYPE STRING,
LANGVECTOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MERGEMAPS_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_MERGEMAPS_STR-MAPNAME sy-vline 
WA_MERGEMAPS_STR-TARTYPE sy-vline 
WA_MERGEMAPS_STR-PREFIX sy-vline 
WA_MERGEMAPS_STR-LOGPATH sy-vline 
WA_MERGEMAPS_STR-LOGTYPE sy-vline 
WA_MERGEMAPS_STR-CREATEUSER sy-vline 
WA_MERGEMAPS_STR-CREATEDATE sy-vline 
WA_MERGEMAPS_STR-CREATETIME sy-vline 
WA_MERGEMAPS_STR-CHANGEUSER sy-vline 
WA_MERGEMAPS_STR-CHANGEDATE sy-vline 
WA_MERGEMAPS_STR-CHANGETIME sy-vline 
WA_MERGEMAPS_STR-LIMUCONV sy-vline 
WA_MERGEMAPS_STR-MERGEINCOMPLETE sy-vline 
WA_MERGEMAPS_STR-MAPTEXT sy-vline 
WA_MERGEMAPS_STR-IGNOREDOBJS sy-vline 
WA_MERGEMAPS_STR-LANGVECTOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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