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

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/DD_LOG_DISPLAY
*  INTO TABLE @DATA(IT_/SAPAPO/DD_LOG_DISPLAY2).
*--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/DD_LOG_DISPLAY INDEX 1 INTO DATA(WA_/SAPAPO/DD_LOG_DISPLAY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/DD_LOG_DISPLAY>-RESOURCE_NAME = 1.
</SAPAPO/DD_LOG_DISPLAY>-SCHEDULING_STEP_COUNT = 1.
</SAPAPO/DD_LOG_DISPLAY>-SCHEDULING_START_DATE_TIME = 1.
</SAPAPO/DD_LOG_DISPLAY>-ORDER_NUMBER = 1.
</SAPAPO/DD_LOG_DISPLAY>-PRODUCT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/DD_LOG_DISPLAY-LOCATION, sy-vline,
  WA_/SAPAPO/DD_LOG_DISPLAY-MAKE_TO_STOCK_SEGMENT, sy-vline,
  WA_/SAPAPO/DD_LOG_DISPLAY-BUFFERED_PRODUCT, sy-vline,
  WA_/SAPAPO/DD_LOG_DISPLAY-PRIORITY_PERCENTAGE, sy-vline,
  WA_/SAPAPO/DD_LOG_DISPLAY-ORD_SELECTED_FOR_SCHEDULE, sy-vline,
  WA_/SAPAPO/DD_LOG_DISPLAY-PRIORITY_CALCULATION_METHOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/DD_LOG_DISPLAY 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/DD_LOG_DISPLAY 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/DD_LOG_DISPLAY INTO WA_/SAPAPO/DD_LOG_DISPLAY.


*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 TSTPS, internal->external for field SCHEDULING_START_DATE_TIME
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/DD_LOG_DISPLAY-SCHEDULING_START_DATE_TIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/DD_LOG_DISPLAY-SCHEDULING_START_DATE_TIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PRODUCT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/DD_LOG_DISPLAY-PRODUCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/DD_LOG_DISPLAY-PRODUCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field MIN_REQ_DATETIME
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/DD_LOG_DISPLAY-MIN_REQ_DATETIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/DD_LOG_DISPLAY-MIN_REQ_DATETIME.
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/DD_LOG_DISPLAY_STR, 
RESOURCE_NAME TYPE STRING,
SCHEDULING_STEP_COUNT TYPE STRING,
SCHEDULING_START_DATE_TIME TYPE STRING,
ORDER_NUMBER TYPE STRING,
PRODUCT TYPE STRING,
LOCATION TYPE STRING,
MAKE_TO_STOCK_SEGMENT TYPE STRING,
BUFFERED_PRODUCT TYPE STRING,
PRIORITY_PERCENTAGE TYPE STRING,
ORD_SELECTED_FOR_SCHEDULE TYPE STRING,
PRIORITY_CALCULATION_METHOD TYPE STRING,
PROJ_STOCK TYPE STRING,
TOP_OF_RED TYPE STRING,
PEGGED_ORDER_NUMBER TYPE STRING,
MIN_REQ_DATETIME TYPE STRING,
NET_DURATION_OF_ORDER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/DD_LOG_DISPLAY_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/DD_LOG_DISPLAY_STR-RESOURCE_NAME sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-SCHEDULING_STEP_COUNT sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-SCHEDULING_START_DATE_TIME sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-ORDER_NUMBER sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-PRODUCT sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-LOCATION sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-MAKE_TO_STOCK_SEGMENT sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-BUFFERED_PRODUCT sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-PRIORITY_PERCENTAGE sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-ORD_SELECTED_FOR_SCHEDULE sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-PRIORITY_CALCULATION_METHOD sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-PROJ_STOCK sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-TOP_OF_RED sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-PEGGED_ORDER_NUMBER sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-MIN_REQ_DATETIME sy-vline 
WA_/SAPAPO/DD_LOG_DISPLAY_STR-NET_DURATION_OF_ORDER sy-vline      INTO ld_text SEPARATED BY SPACE.

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