ABAP Select data from SAP table DB6PMCG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6PMCG 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 DB6PMCG. 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 DB6PMCG 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_DB6PMCG TYPE STANDARD TABLE OF DB6PMCG,
      WA_DB6PMCG TYPE DB6PMCG,
      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: <DB6PMCG> TYPE DB6PMCG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6PMCG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6PMCG
  INTO TABLE IT_DB6PMCG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6PMCG
*  INTO TABLE @DATA(IT_DB6PMCG2).
*--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_DB6PMCG INDEX 1 INTO DATA(WA_DB6PMCG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6PMCG ASSIGNING <DB6PMCG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6PMCG>-PROGID = 1.
<DB6PMCG>-MOVETIME = 1.
<DB6PMCG>-PARTITN = 1.
<DB6PMCG>-LOGNAME = 1.
<DB6PMCG>-RETURNCODE = 1.

ENDLOOP.

LOOP AT IT_DB6PMCG INTO WA_DB6PMCG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6PMCG-COMPTIME, sy-vline,
  WA_DB6PMCG-TARGET, sy-vline,
  WA_DB6PMCG-LOCATION, sy-vline,
  WA_DB6PMCG-CHAIN, sy-vline,
  WA_DB6PMCG-ARCHTYPE, sy-vline,
  WA_DB6PMCG-DOUBLSTORLOC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6PMCG 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_DB6PMCG 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_DB6PMCG INTO WA_DB6PMCG.


*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_DB6PMCG_STR, 
PROGID TYPE STRING,
MOVETIME TYPE STRING,
PARTITN TYPE STRING,
LOGNAME TYPE STRING,
RETURNCODE TYPE STRING,
COMPTIME TYPE STRING,
TARGET TYPE STRING,
LOCATION TYPE STRING,
CHAIN TYPE STRING,
ARCHTYPE TYPE STRING,
DOUBLSTORLOC TYPE STRING,
STATUS TYPE STRING,
EID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6PMCG_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_DB6PMCG_STR-PROGID sy-vline 
WA_DB6PMCG_STR-MOVETIME sy-vline 
WA_DB6PMCG_STR-PARTITN sy-vline 
WA_DB6PMCG_STR-LOGNAME sy-vline 
WA_DB6PMCG_STR-RETURNCODE sy-vline 
WA_DB6PMCG_STR-COMPTIME sy-vline 
WA_DB6PMCG_STR-TARGET sy-vline 
WA_DB6PMCG_STR-LOCATION sy-vline 
WA_DB6PMCG_STR-CHAIN sy-vline 
WA_DB6PMCG_STR-ARCHTYPE sy-vline 
WA_DB6PMCG_STR-DOUBLSTORLOC sy-vline 
WA_DB6PMCG_STR-STATUS sy-vline 
WA_DB6PMCG_STR-EID sy-vline      INTO ld_text SEPARATED BY SPACE.

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