ABAP Select data from SAP table /SAPAPO/CTMDEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/CTMDEM 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 /SAPAPO/CTMDEM. 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 /SAPAPO/CTMDEM 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_/SAPAPO/CTMDEM TYPE STANDARD TABLE OF /SAPAPO/CTMDEM,
      WA_/SAPAPO/CTMDEM TYPE /SAPAPO/CTMDEM,
      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: </SAPAPO/CTMDEM> TYPE /SAPAPO/CTMDEM.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/CTMDEM
  INTO TABLE IT_/SAPAPO/CTMDEM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/CTMDEM
*  INTO TABLE @DATA(IT_/SAPAPO/CTMDEM2).
*--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_/SAPAPO/CTMDEM INDEX 1 INTO DATA(WA_/SAPAPO/CTMDEM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/CTMDEM ASSIGNING </SAPAPO/CTMDEM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/CTMDEM>-MANDT = 1.
</SAPAPO/CTMDEM>-PRFLID = 1.
</SAPAPO/CTMDEM>-TASKID = 1.
</SAPAPO/CTMDEM>-DEMID = 1.
</SAPAPO/CTMDEM>-DEMCAT = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/CTMDEM INTO WA_/SAPAPO/CTMDEM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/CTMDEM-PRIO, sy-vline,
  WA_/SAPAPO/CTMDEM-VRSIOID, sy-vline,
  WA_/SAPAPO/CTMDEM-MATID, sy-vline,
  WA_/SAPAPO/CTMDEM-LOCID, sy-vline,
  WA_/SAPAPO/CTMDEM-ACCID, sy-vline,
  WA_/SAPAPO/CTMDEM-PLSEC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/CTMDEM 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_/SAPAPO/CTMDEM 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_/SAPAPO/CTMDEM INTO WA_/SAPAPO/CTMDEM.


*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 VRSIO, internal->external for field VRSIOID
CALL FUNCTION 'CONVERSION_EXIT_VRSIO_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/CTMDEM-VRSIOID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/CTMDEM-VRSIOID.
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_/SAPAPO/CTMDEM_STR, 
MANDT TYPE STRING,
PRFLID TYPE STRING,
TASKID TYPE STRING,
DEMID TYPE STRING,
DEMCAT TYPE STRING,
PRIO TYPE STRING,
VRSIOID TYPE STRING,
MATID TYPE STRING,
LOCID TYPE STRING,
ACCID TYPE STRING,
PLSEC TYPE STRING,
QUANTITY TYPE STRING,
DUEDATE TYPE STRING,
ATPCAT TYPE STRING,
ATPCATTYPE TYPE STRING,
SUBLOC TYPE STRING,
LATEDEM TYPE STRING,
LATESHIP TYPE STRING,
EARLYSHIPFLG TYPE STRING,
EARLYSHIP TYPE STRING,
EARLYPROD TYPE STRING,
PARSHIP TYPE STRING,
PARSHIPMIN TYPE STRING,
PARSAT TYPE STRING,
PARSATMIN TYPE STRING,
OVERDELIVERY TYPE STRING,
PARSATMAX TYPE STRING,
NUMSHIP TYPE STRING,
SHIPPACK TYPE STRING,
PEGGINGTYPE TYPE STRING,
SUBSTKEY TYPE STRING,
OBJID TYPE STRING,
NOSUBST TYPE STRING,
NO_PREQ TYPE STRING,
ADVCODE TYPE STRING,
PRIO_REQ TYPE STRING,
ORDTYPE TYPE STRING,
R3OBJ TYPE STRING,
CUOBJ TYPE STRING,
SHLF_MIN TYPE STRING,
SHLF_MAX TYPE STRING,
USE_SHLF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/CTMDEM_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_/SAPAPO/CTMDEM_STR-MANDT sy-vline 
WA_/SAPAPO/CTMDEM_STR-PRFLID sy-vline 
WA_/SAPAPO/CTMDEM_STR-TASKID sy-vline 
WA_/SAPAPO/CTMDEM_STR-DEMID sy-vline 
WA_/SAPAPO/CTMDEM_STR-DEMCAT sy-vline 
WA_/SAPAPO/CTMDEM_STR-PRIO sy-vline 
WA_/SAPAPO/CTMDEM_STR-VRSIOID sy-vline 
WA_/SAPAPO/CTMDEM_STR-MATID sy-vline 
WA_/SAPAPO/CTMDEM_STR-LOCID sy-vline 
WA_/SAPAPO/CTMDEM_STR-ACCID sy-vline 
WA_/SAPAPO/CTMDEM_STR-PLSEC sy-vline 
WA_/SAPAPO/CTMDEM_STR-QUANTITY sy-vline 
WA_/SAPAPO/CTMDEM_STR-DUEDATE sy-vline 
WA_/SAPAPO/CTMDEM_STR-ATPCAT sy-vline 
WA_/SAPAPO/CTMDEM_STR-ATPCATTYPE sy-vline 
WA_/SAPAPO/CTMDEM_STR-SUBLOC sy-vline 
WA_/SAPAPO/CTMDEM_STR-LATEDEM sy-vline 
WA_/SAPAPO/CTMDEM_STR-LATESHIP sy-vline 
WA_/SAPAPO/CTMDEM_STR-EARLYSHIPFLG sy-vline 
WA_/SAPAPO/CTMDEM_STR-EARLYSHIP sy-vline 
WA_/SAPAPO/CTMDEM_STR-EARLYPROD sy-vline 
WA_/SAPAPO/CTMDEM_STR-PARSHIP sy-vline 
WA_/SAPAPO/CTMDEM_STR-PARSHIPMIN sy-vline 
WA_/SAPAPO/CTMDEM_STR-PARSAT sy-vline 
WA_/SAPAPO/CTMDEM_STR-PARSATMIN sy-vline 
WA_/SAPAPO/CTMDEM_STR-OVERDELIVERY sy-vline 
WA_/SAPAPO/CTMDEM_STR-PARSATMAX sy-vline 
WA_/SAPAPO/CTMDEM_STR-NUMSHIP sy-vline 
WA_/SAPAPO/CTMDEM_STR-SHIPPACK sy-vline 
WA_/SAPAPO/CTMDEM_STR-PEGGINGTYPE sy-vline 
WA_/SAPAPO/CTMDEM_STR-SUBSTKEY sy-vline 
WA_/SAPAPO/CTMDEM_STR-OBJID sy-vline 
WA_/SAPAPO/CTMDEM_STR-NOSUBST sy-vline 
WA_/SAPAPO/CTMDEM_STR-NO_PREQ sy-vline 
WA_/SAPAPO/CTMDEM_STR-ADVCODE sy-vline 
WA_/SAPAPO/CTMDEM_STR-PRIO_REQ sy-vline 
WA_/SAPAPO/CTMDEM_STR-ORDTYPE sy-vline 
WA_/SAPAPO/CTMDEM_STR-R3OBJ sy-vline 
WA_/SAPAPO/CTMDEM_STR-CUOBJ sy-vline 
WA_/SAPAPO/CTMDEM_STR-SHLF_MIN sy-vline 
WA_/SAPAPO/CTMDEM_STR-SHLF_MAX sy-vline 
WA_/SAPAPO/CTMDEM_STR-USE_SHLF sy-vline      INTO ld_text SEPARATED BY SPACE.

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