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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/OM_LEVELS
*  INTO TABLE @DATA(IT_/SAPAPO/OM_LEVELS2).
*--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/OM_LEVELS INDEX 1 INTO DATA(WA_/SAPAPO/OM_LEVELS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/OM_LEVELS>-ATP = 1.
</SAPAPO/OM_LEVELS>-ATP_DELTA = 1.
</SAPAPO/OM_LEVELS>-API_INTFACE = 1.
</SAPAPO/OM_LEVELS>-BASIC_ROUTINES = 1.
</SAPAPO/OM_LEVELS>-SLOTTER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/OM_LEVELS-ONLINE_SCHEDULER, sy-vline,
  WA_/SAPAPO/OM_LEVELS-PEGGING_BOX, sy-vline,
  WA_/SAPAPO/OM_LEVELS-CHARACTERISTICS, sy-vline,
  WA_/SAPAPO/OM_LEVELS-BUCKET_VEKTOR, sy-vline,
  WA_/SAPAPO/OM_LEVELS-AGO, sy-vline,
  WA_/SAPAPO/OM_LEVELS-IONODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/OM_LEVELS 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/OM_LEVELS 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/OM_LEVELS INTO WA_/SAPAPO/OM_LEVELS.


*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_/SAPAPO/OM_LEVELS_STR, 
ATP TYPE STRING,
ATP_DELTA TYPE STRING,
API_INTFACE TYPE STRING,
BASIC_ROUTINES TYPE STRING,
SLOTTER TYPE STRING,
ONLINE_SCHEDULER TYPE STRING,
PEGGING_BOX TYPE STRING,
CHARACTERISTICS TYPE STRING,
BUCKET_VEKTOR TYPE STRING,
AGO TYPE STRING,
IONODE TYPE STRING,
TIMESTREAM TYPE STRING,
MONITOR TYPE STRING,
NET_CHANGER TYPE STRING,
CHOOSER TYPE STRING,
RPM TYPE STRING,
RECORDER TYPE STRING,
SETUP TYPE STRING,
API TYPE STRING,
SNP_API TYPE STRING,
SNP_PROP TYPE STRING,
SNP_OTHER TYPE STRING,
TASIM TYPE STRING,
STORAGE TYPE STRING,
CMFSPLITTER TYPE STRING,
ABS_LAZY_H TYPE STRING,
FIX_PEGBOX TYPE STRING,
PEG_IOLIST TYPE STRING,
PEGMACHINE TYPE STRING,
IOLIST TYPE STRING,
EVENTVECTOR TYPE STRING,
CAMPAIGN TYPE STRING,
MODE TYPE STRING,
REP TYPE STRING,
SEA TYPE STRING,
ALERT_ORDER_NET_CACHE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/OM_LEVELS_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/OM_LEVELS_STR-ATP sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-ATP_DELTA sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-API_INTFACE sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-BASIC_ROUTINES sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SLOTTER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-ONLINE_SCHEDULER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-PEGGING_BOX sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-CHARACTERISTICS sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-BUCKET_VEKTOR sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-AGO sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-IONODE sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-TIMESTREAM sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-MONITOR sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-NET_CHANGER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-CHOOSER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-RPM sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-RECORDER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SETUP sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-API sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SNP_API sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SNP_PROP sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SNP_OTHER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-TASIM sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-STORAGE sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-CMFSPLITTER sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-ABS_LAZY_H sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-FIX_PEGBOX sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-PEG_IOLIST sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-PEGMACHINE sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-IOLIST sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-EVENTVECTOR sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-CAMPAIGN sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-MODE sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-REP sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-SEA sy-vline 
WA_/SAPAPO/OM_LEVELS_STR-ALERT_ORDER_NET_CACHE sy-vline      INTO ld_text SEPARATED BY SPACE.

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