ABAP Select data from SAP table SMY_PCMH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SMY_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 SMY_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 SMY_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_SMY_PCMH TYPE STANDARD TABLE OF SMY_PCMH,
      WA_SMY_PCMH TYPE SMY_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: <SMY_PCMH> TYPE SMY_PCMH.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SMY_PCMH
*  INTO TABLE @DATA(IT_SMY_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_SMY_PCMH INDEX 1 INTO DATA(WA_SMY_PCMH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SMY_PCMH>-HDRROWUUID = 1.
<SMY_PCMH>-ROWUUID = 1.
<SMY_PCMH>-PCMUUID = 1.
<SMY_PCMH>-LOCUUID = 1.
<SMY_PCMH>-METHOD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SMY_PCMH-LOCID, sy-vline,
  WA_SMY_PCMH-PCMNR, sy-vline,
  WA_SMY_PCMH-PCMID, sy-vline,
  WA_SMY_PCMH-PCART, sy-vline,
  WA_SMY_PCMH-PCSTART, sy-vline,
  WA_SMY_PCMH-PCEND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SMY_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_SMY_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_SMY_PCMH INTO WA_SMY_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_SMY_PCMH-PCMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SMY_PCMH-PCMNR.
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_SMY_PCMH_STR, 
HDRROWUUID TYPE STRING,
ROWUUID TYPE STRING,
PCMUUID TYPE STRING,
LOCUUID TYPE STRING,
METHOD TYPE STRING,
LOCID TYPE STRING,
PCMNR TYPE STRING,
PCMID TYPE STRING,
PCART TYPE STRING,
PCSTART TYPE STRING,
PCEND TYPE STRING,
LOCATION TYPE STRING,
PCTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SMY_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_SMY_PCMH_STR-HDRROWUUID sy-vline 
WA_SMY_PCMH_STR-ROWUUID sy-vline 
WA_SMY_PCMH_STR-PCMUUID sy-vline 
WA_SMY_PCMH_STR-LOCUUID sy-vline 
WA_SMY_PCMH_STR-METHOD sy-vline 
WA_SMY_PCMH_STR-LOCID sy-vline 
WA_SMY_PCMH_STR-PCMNR sy-vline 
WA_SMY_PCMH_STR-PCMID sy-vline 
WA_SMY_PCMH_STR-PCART sy-vline 
WA_SMY_PCMH_STR-PCSTART sy-vline 
WA_SMY_PCMH_STR-PCEND sy-vline 
WA_SMY_PCMH_STR-LOCATION sy-vline 
WA_SMY_PCMH_STR-PCTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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