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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/MM_DOC
*  INTO TABLE @DATA(IT_/SAPAPO/MM_DOC2).
*--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/MM_DOC INDEX 1 INTO DATA(WA_/SAPAPO/MM_DOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/MM_DOC>-MANDT = 1.
</SAPAPO/MM_DOC>-GUID = 1.
</SAPAPO/MM_DOC>-EKGRP = 1.
</SAPAPO/MM_DOC>-KUNNR = 1.
</SAPAPO/MM_DOC>-LPRIO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/MM_DOC-VKORG, sy-vline,
  WA_/SAPAPO/MM_DOC-VTWEG, sy-vline,
  WA_/SAPAPO/MM_DOC-SPART, sy-vline,
  WA_/SAPAPO/MM_DOC-EKORG, sy-vline,
  WA_/SAPAPO/MM_DOC-KOSCH, sy-vline,
  WA_/SAPAPO/MM_DOC-ORDID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/MM_DOC 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/MM_DOC 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/MM_DOC INTO WA_/SAPAPO/MM_DOC.


*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 REQPRF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/MM_DOC-REQPRF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/MM_DOC-REQPRF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/MM_DOC-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/MM_DOC-VRKME.
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/MM_DOC_STR, 
MANDT TYPE STRING,
GUID TYPE STRING,
EKGRP TYPE STRING,
KUNNR TYPE STRING,
LPRIO TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
EKORG TYPE STRING,
KOSCH TYPE STRING,
ORDID TYPE STRING,
POSITION_NO TYPE STRING,
EXT_LOCTO TYPE STRING,
LOCTO TYPE STRING,
LOCFR TYPE STRING,
MATID TYPE STRING,
SUBST TYPE STRING,
CREATED_AT TYPE STRING,
CREATED_BY TYPE STRING,
CHANGED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
PARENT TYPE STRING,
ORDERED_PROD TYPE STRING,
PARTNER_PROD TYPE STRING,
ITM_TYPE TYPE STRING,
SUBST_REASON TYPE STRING,
STORE_LOC TYPE STRING,
ACCID TYPE STRING,
CHMOD TYPE STRING,
ATPCAT TYPE STRING,
DLVGRP TYPE STRING,
REQPRF TYPE STRING,
RESMOD TYPE STRING,
VRKME TYPE STRING,
COPAC TYPE STRING,
BSART TYPE STRING,
PSTYP TYPE STRING,
NO_SUBST TYPE STRING,
SCHED_BWLPROCESS TYPE STRING,
UEBPO TYPE STRING,
BOP_PROCESS TYPE STRING,
PRREG TYPE STRING,
PRIO_REQ TYPE STRING,
ADVCODE TYPE STRING,
VSTEL TYPE STRING,
VSBED TYPE STRING,
FIXMG TYPE STRING,
VEN_NAME1 TYPE STRING,
VEN_NAME2 TYPE STRING,
VEN_CITY1 TYPE STRING,
VEN_COUNTRY TYPE STRING,
SCHED_HNDLG TYPE STRING,
ROUTE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/MM_DOC_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/MM_DOC_STR-MANDT sy-vline 
WA_/SAPAPO/MM_DOC_STR-GUID sy-vline 
WA_/SAPAPO/MM_DOC_STR-EKGRP sy-vline 
WA_/SAPAPO/MM_DOC_STR-KUNNR sy-vline 
WA_/SAPAPO/MM_DOC_STR-LPRIO sy-vline 
WA_/SAPAPO/MM_DOC_STR-VKORG sy-vline 
WA_/SAPAPO/MM_DOC_STR-VTWEG sy-vline 
WA_/SAPAPO/MM_DOC_STR-SPART sy-vline 
WA_/SAPAPO/MM_DOC_STR-EKORG sy-vline 
WA_/SAPAPO/MM_DOC_STR-KOSCH sy-vline 
WA_/SAPAPO/MM_DOC_STR-ORDID sy-vline 
WA_/SAPAPO/MM_DOC_STR-POSITION_NO sy-vline 
WA_/SAPAPO/MM_DOC_STR-EXT_LOCTO sy-vline 
WA_/SAPAPO/MM_DOC_STR-LOCTO sy-vline 
WA_/SAPAPO/MM_DOC_STR-LOCFR sy-vline 
WA_/SAPAPO/MM_DOC_STR-MATID sy-vline 
WA_/SAPAPO/MM_DOC_STR-SUBST sy-vline 
WA_/SAPAPO/MM_DOC_STR-CREATED_AT sy-vline 
WA_/SAPAPO/MM_DOC_STR-CREATED_BY sy-vline 
WA_/SAPAPO/MM_DOC_STR-CHANGED_AT sy-vline 
WA_/SAPAPO/MM_DOC_STR-CHANGED_BY sy-vline 
WA_/SAPAPO/MM_DOC_STR-PARENT sy-vline 
WA_/SAPAPO/MM_DOC_STR-ORDERED_PROD sy-vline 
WA_/SAPAPO/MM_DOC_STR-PARTNER_PROD sy-vline 
WA_/SAPAPO/MM_DOC_STR-ITM_TYPE sy-vline 
WA_/SAPAPO/MM_DOC_STR-SUBST_REASON sy-vline 
WA_/SAPAPO/MM_DOC_STR-STORE_LOC sy-vline 
WA_/SAPAPO/MM_DOC_STR-ACCID sy-vline 
WA_/SAPAPO/MM_DOC_STR-CHMOD sy-vline 
WA_/SAPAPO/MM_DOC_STR-ATPCAT sy-vline 
WA_/SAPAPO/MM_DOC_STR-DLVGRP sy-vline 
WA_/SAPAPO/MM_DOC_STR-REQPRF sy-vline 
WA_/SAPAPO/MM_DOC_STR-RESMOD sy-vline 
WA_/SAPAPO/MM_DOC_STR-VRKME sy-vline 
WA_/SAPAPO/MM_DOC_STR-COPAC sy-vline 
WA_/SAPAPO/MM_DOC_STR-BSART sy-vline 
WA_/SAPAPO/MM_DOC_STR-PSTYP sy-vline 
WA_/SAPAPO/MM_DOC_STR-NO_SUBST sy-vline 
WA_/SAPAPO/MM_DOC_STR-SCHED_BWLPROCESS sy-vline 
WA_/SAPAPO/MM_DOC_STR-UEBPO sy-vline 
WA_/SAPAPO/MM_DOC_STR-BOP_PROCESS sy-vline 
WA_/SAPAPO/MM_DOC_STR-PRREG sy-vline 
WA_/SAPAPO/MM_DOC_STR-PRIO_REQ sy-vline 
WA_/SAPAPO/MM_DOC_STR-ADVCODE sy-vline 
WA_/SAPAPO/MM_DOC_STR-VSTEL sy-vline 
WA_/SAPAPO/MM_DOC_STR-VSBED sy-vline 
WA_/SAPAPO/MM_DOC_STR-FIXMG sy-vline 
WA_/SAPAPO/MM_DOC_STR-VEN_NAME1 sy-vline 
WA_/SAPAPO/MM_DOC_STR-VEN_NAME2 sy-vline 
WA_/SAPAPO/MM_DOC_STR-VEN_CITY1 sy-vline 
WA_/SAPAPO/MM_DOC_STR-VEN_COUNTRY sy-vline 
WA_/SAPAPO/MM_DOC_STR-SCHED_HNDLG sy-vline 
WA_/SAPAPO/MM_DOC_STR-ROUTE sy-vline      INTO ld_text SEPARATED BY SPACE.

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