ABAP Select data from SAP table PCMH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PCMH
*  INTO TABLE @DATA(IT_PCMH2).
*--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_PCMH INDEX 1 INTO DATA(WA_PCMH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PCMH>-MANDT = 1.
<PCMH>-PCMNR = 1.
<PCMH>-ERNAM = 1.
<PCMH>-ERDAT = 1.
<PCMH>-AENAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PCMH-AEDAT, sy-vline,
  WA_PCMH-PCART, sy-vline,
  WA_PCMH-PCSTD, sy-vline,
  WA_PCMH-PCSTT, sy-vline,
  WA_PCMH-PCEND, sy-vline,
  WA_PCMH-PCENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PCMH 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_PCMH 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_PCMH INTO WA_PCMH.


*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 ALPHA, internal->external for field PCMNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PCMH-PCMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCMH-PCMNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPROZNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PCMH-GPROZNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCMH-GPROZNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PCMH-UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCMH-UOM.
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_PCMH_STR, 
MANDT TYPE STRING,
PCMNR TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
PCART TYPE STRING,
PCSTD TYPE STRING,
PCSTT TYPE STRING,
PCEND TYPE STRING,
PCENT TYPE STRING,
GPROZGR TYPE STRING,
GPROZNR TYPE STRING,
PCTXT TYPE STRING,
TAKT TYPE STRING,
UOM TYPE STRING,
PCMID TYPE STRING,
APOZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PCMH_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_PCMH_STR-MANDT sy-vline 
WA_PCMH_STR-PCMNR sy-vline 
WA_PCMH_STR-ERNAM sy-vline 
WA_PCMH_STR-ERDAT sy-vline 
WA_PCMH_STR-AENAM sy-vline 
WA_PCMH_STR-AEDAT sy-vline 
WA_PCMH_STR-PCART sy-vline 
WA_PCMH_STR-PCSTD sy-vline 
WA_PCMH_STR-PCSTT sy-vline 
WA_PCMH_STR-PCEND sy-vline 
WA_PCMH_STR-PCENT sy-vline 
WA_PCMH_STR-GPROZGR sy-vline 
WA_PCMH_STR-GPROZNR sy-vline 
WA_PCMH_STR-PCTXT sy-vline 
WA_PCMH_STR-TAKT sy-vline 
WA_PCMH_STR-UOM sy-vline 
WA_PCMH_STR-PCMID sy-vline 
WA_PCMH_STR-APOZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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