ABAP Select data from SAP table DB6PMCTAB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6PMCTAB 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 DB6PMCTAB. 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 DB6PMCTAB 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_DB6PMCTAB TYPE STANDARD TABLE OF DB6PMCTAB,
      WA_DB6PMCTAB TYPE DB6PMCTAB,
      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: <DB6PMCTAB> TYPE DB6PMCTAB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6PMCTAB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6PMCTAB
  INTO TABLE IT_DB6PMCTAB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6PMCTAB
*  INTO TABLE @DATA(IT_DB6PMCTAB2).
*--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_DB6PMCTAB INDEX 1 INTO DATA(WA_DB6PMCTAB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6PMCTAB ASSIGNING <DB6PMCTAB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6PMCTAB>-TABSCHEMA = 1.
<DB6PMCTAB>-TABLENAME = 1.
<DB6PMCTAB>-RCKTSPACE = 1.
<DB6PMCTAB>-SYSCARD = 1.
<DB6PMCTAB>-SYSOVERFLW = 1.

ENDLOOP.

LOOP AT IT_DB6PMCTAB INTO WA_DB6PMCTAB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6PMCTAB-SYSNPAGES, sy-vline,
  WA_DB6PMCTAB-SYSFPAGES, sy-vline,
  WA_DB6PMCTAB-SYSSTATDAT, sy-vline,
  WA_DB6PMCTAB-SYSSTATTIM, sy-vline,
  WA_DB6PMCTAB-RCKTOTALKB, sy-vline,
  WA_DB6PMCTAB-RCKDB6F1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6PMCTAB 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_DB6PMCTAB 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_DB6PMCTAB INTO WA_DB6PMCTAB.


*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_DB6PMCTAB_STR, 
TABSCHEMA TYPE STRING,
TABLENAME TYPE STRING,
RCKTSPACE TYPE STRING,
SYSCARD TYPE STRING,
SYSOVERFLW TYPE STRING,
SYSNPAGES TYPE STRING,
SYSFPAGES TYPE STRING,
SYSSTATDAT TYPE STRING,
SYSSTATTIM TYPE STRING,
RCKTOTALKB TYPE STRING,
RCKDB6F1 TYPE STRING,
RCKDB6F2 TYPE STRING,
RCKDB6F3 TYPE STRING,
RCKDB6F1R TYPE STRING,
RCKDB6F2R TYPE STRING,
RCKDB6F3R TYPE STRING,
RCKDAT TYPE STRING,
RCKTIM TYPE STRING,
RCKREODAT TYPE STRING,
RCKREORTIM TYPE STRING,
SYSVOLATIL TYPE STRING,
PCTFREE TYPE STRING,
STATS_PROF TYPE STRING,
COMPRESSION TYPE STRING,
CLUSTERED TYPE STRING,
DISTRIBSTAT TYPE STRING,
PARTITION_MODE TYPE STRING,
AVGROWCOMPSIZE TYPE STRING,
AVGROWCOMPRATIO TYPE STRING,
AVGROWSIZE TYPE STRING,
PCTROWSCOMPR TYPE STRING,
PCTPAGESSAVED TYPE STRING,
TABTYPE TYPE STRING,
PCTALLSAVED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6PMCTAB_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_DB6PMCTAB_STR-TABSCHEMA sy-vline 
WA_DB6PMCTAB_STR-TABLENAME sy-vline 
WA_DB6PMCTAB_STR-RCKTSPACE sy-vline 
WA_DB6PMCTAB_STR-SYSCARD sy-vline 
WA_DB6PMCTAB_STR-SYSOVERFLW sy-vline 
WA_DB6PMCTAB_STR-SYSNPAGES sy-vline 
WA_DB6PMCTAB_STR-SYSFPAGES sy-vline 
WA_DB6PMCTAB_STR-SYSSTATDAT sy-vline 
WA_DB6PMCTAB_STR-SYSSTATTIM sy-vline 
WA_DB6PMCTAB_STR-RCKTOTALKB sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F1 sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F2 sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F3 sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F1R sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F2R sy-vline 
WA_DB6PMCTAB_STR-RCKDB6F3R sy-vline 
WA_DB6PMCTAB_STR-RCKDAT sy-vline 
WA_DB6PMCTAB_STR-RCKTIM sy-vline 
WA_DB6PMCTAB_STR-RCKREODAT sy-vline 
WA_DB6PMCTAB_STR-RCKREORTIM sy-vline 
WA_DB6PMCTAB_STR-SYSVOLATIL sy-vline 
WA_DB6PMCTAB_STR-PCTFREE sy-vline 
WA_DB6PMCTAB_STR-STATS_PROF sy-vline 
WA_DB6PMCTAB_STR-COMPRESSION sy-vline 
WA_DB6PMCTAB_STR-CLUSTERED sy-vline 
WA_DB6PMCTAB_STR-DISTRIBSTAT sy-vline 
WA_DB6PMCTAB_STR-PARTITION_MODE sy-vline 
WA_DB6PMCTAB_STR-AVGROWCOMPSIZE sy-vline 
WA_DB6PMCTAB_STR-AVGROWCOMPRATIO sy-vline 
WA_DB6PMCTAB_STR-AVGROWSIZE sy-vline 
WA_DB6PMCTAB_STR-PCTROWSCOMPR sy-vline 
WA_DB6PMCTAB_STR-PCTPAGESSAVED sy-vline 
WA_DB6PMCTAB_STR-TABTYPE sy-vline 
WA_DB6PMCTAB_STR-PCTALLSAVED sy-vline      INTO ld_text SEPARATED BY SPACE.

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