ABAP Select data from SAP table MEREP_CMNIF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEREP_CMNIF 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_CMNIF. 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_CMNIF 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_CMNIF TYPE STANDARD TABLE OF MEREP_CMNIF,
      WA_MEREP_CMNIF TYPE MEREP_CMNIF,
      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_CMNIF> TYPE MEREP_CMNIF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEREP_CMNIF
*  INTO TABLE @DATA(IT_MEREP_CMNIF2).
*--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_CMNIF INDEX 1 INTO DATA(WA_MEREP_CMNIF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEREP_CMNIF>-MBL401 = 1.
<MEREP_CMNIF>-SCENARIO = 1.
<MEREP_CMNIF>-OBJTYPE = 1.
<MEREP_CMNIF>-CREDAT = 1.
<MEREP_CMNIF>-CRENAM = 1.

ENDLOOP.

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

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


*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 ISOLA, internal->external for field LANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MEREP_CMNIF-LANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEREP_CMNIF-LANG.
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_MEREP_CMNIF_STR, 
MBL401 TYPE STRING,
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,
MBL401T TYPE STRING,
SCENARIO TYPE STRING,
LANG TYPE STRING,
TEXT TYPE STRING,
MBL801 TYPE STRING,
SYNCTYPE TYPE STRING,
SYNCDIR TYPE STRING,
SP_TAB TYPE STRING,
FUNC_GROUP TYPE STRING,
I_MBL406 TYPE STRING,
I_MBL408 TYPE STRING,
I_MBL410 TYPE STRING,
I_MBL411 TYPE STRING,
I_MBL802 TYPE STRING,
I_MBL809 TYPE STRING,
I_STRUCT_IDS TYPE STRING,
I_METADATA TYPE STRING,
I_DEV_TO_R3 TYPE STRING,
I_R3_TO_DEV TYPE STRING,
I_VALU_TO_R3 TYPE STRING,
I_BAPI_METADATA TYPE STRING,
I_BAPI_TYPEDATA TYPE STRING,
RFCDEST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEREP_CMNIF_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_CMNIF_STR-MBL401 sy-vline 
WA_MEREP_CMNIF_STR-SCENARIO sy-vline 
WA_MEREP_CMNIF_STR-OBJTYPE sy-vline 
WA_MEREP_CMNIF_STR-CREDAT sy-vline 
WA_MEREP_CMNIF_STR-CRENAM sy-vline 
WA_MEREP_CMNIF_STR-CRETIM sy-vline 
WA_MEREP_CMNIF_STR-CHGDAT sy-vline 
WA_MEREP_CMNIF_STR-CHGNAM sy-vline 
WA_MEREP_CMNIF_STR-CHGTIM sy-vline 
WA_MEREP_CMNIF_STR-GENDAT sy-vline 
WA_MEREP_CMNIF_STR-GENNAM sy-vline 
WA_MEREP_CMNIF_STR-GENTIM sy-vline 
WA_MEREP_CMNIF_STR-SAPRL sy-vline 
WA_MEREP_CMNIF_STR-VERNUM sy-vline 
WA_MEREP_CMNIF_STR-GENVER sy-vline 
WA_MEREP_CMNIF_STR-RFCDEST sy-vline 
WA_MEREP_CMNIF_STR-RFCFLAG sy-vline 
WA_MEREP_CMNIF_STR-SYNCTYPE sy-vline 
WA_MEREP_CMNIF_STR-EDITLOCK sy-vline 
WA_MEREP_CMNIF_STR-TYPCHK sy-vline 
WA_MEREP_CMNIF_STR-PUBLISH sy-vline 
WA_MEREP_CMNIF_STR-FUNC_GROUP sy-vline 
WA_MEREP_CMNIF_STR-ITEM_COMPARE sy-vline 
WA_MEREP_CMNIF_STR-SYNTAX_ERROR sy-vline 
WA_MEREP_CMNIF_STR-META_ERROR sy-vline 
WA_MEREP_CMNIF_STR-PUSH_ENABLED sy-vline 
WA_MEREP_CMNIF_STR-DEFAULT_IS_ASYNC sy-vline 
WA_MEREP_CMNIF_STR-MASS_DATA sy-vline 
WA_MEREP_CMNIF_STR-MBL401T sy-vline 
WA_MEREP_CMNIF_STR-SCENARIO sy-vline 
WA_MEREP_CMNIF_STR-LANG sy-vline 
WA_MEREP_CMNIF_STR-TEXT sy-vline 
WA_MEREP_CMNIF_STR-MBL801 sy-vline 
WA_MEREP_CMNIF_STR-SYNCTYPE sy-vline 
WA_MEREP_CMNIF_STR-SYNCDIR sy-vline 
WA_MEREP_CMNIF_STR-SP_TAB sy-vline 
WA_MEREP_CMNIF_STR-FUNC_GROUP sy-vline 
WA_MEREP_CMNIF_STR-I_MBL406 sy-vline 
WA_MEREP_CMNIF_STR-I_MBL408 sy-vline 
WA_MEREP_CMNIF_STR-I_MBL410 sy-vline 
WA_MEREP_CMNIF_STR-I_MBL411 sy-vline 
WA_MEREP_CMNIF_STR-I_MBL802 sy-vline 
WA_MEREP_CMNIF_STR-I_MBL809 sy-vline 
WA_MEREP_CMNIF_STR-I_STRUCT_IDS sy-vline 
WA_MEREP_CMNIF_STR-I_METADATA sy-vline 
WA_MEREP_CMNIF_STR-I_DEV_TO_R3 sy-vline 
WA_MEREP_CMNIF_STR-I_R3_TO_DEV sy-vline 
WA_MEREP_CMNIF_STR-I_VALU_TO_R3 sy-vline 
WA_MEREP_CMNIF_STR-I_BAPI_METADATA sy-vline 
WA_MEREP_CMNIF_STR-I_BAPI_TYPEDATA sy-vline 
WA_MEREP_CMNIF_STR-RFCDEST sy-vline      INTO ld_text SEPARATED BY SPACE.

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