ABAP Select data from SAP table /MRSS/T_ACT_BUFFER_ACT_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_ACT_BUFFER_ACT_DATA
*  INTO TABLE @DATA(IT_/MRSS/T_ACT_BUFFER_ACT_DATA2).
*--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_/MRSS/T_ACT_BUFFER_ACT_DATA INDEX 1 INTO DATA(WA_/MRSS/T_ACT_BUFFER_ACT_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_ACT_BUFFER_ACT_DATA>-RESOURCE_TREE = 1.
</MRSS/T_ACT_BUFFER_ACT_DATA>-DELETED_TREE = 1.
</MRSS/T_ACT_BUFFER_ACT_DATA>-LOG_TEXT = 1.
</MRSS/T_ACT_BUFFER_ACT_DATA>-LTEXT_SCREEN = 1.
</MRSS/T_ACT_BUFFER_ACT_DATA>-LINE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_ACT_BUFFER_ACT_DATA-LTEXT_HEADER, sy-vline,
  WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDOBJECT, sy-vline,
  WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDNAME, sy-vline,
  WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDID, sy-vline,
  WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDSPRAS, sy-vline,
  WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDTITLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_ACT_BUFFER_ACT_DATA 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_/MRSS/T_ACT_BUFFER_ACT_DATA 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_/MRSS/T_ACT_BUFFER_ACT_DATA INTO WA_/MRSS/T_ACT_BUFFER_ACT_DATA.


*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 ISOLA, internal->external for field TDSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDSPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field TDOSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDOSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_ACT_BUFFER_ACT_DATA-TDOSPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_ACT_BUFFER_ACT_DATA-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_ACT_BUFFER_ACT_DATA-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field REM_EFFORT_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_ACT_BUFFER_ACT_DATA-REM_EFFORT_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_ACT_BUFFER_ACT_DATA-REM_EFFORT_UNIT.
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_/MRSS/T_ACT_BUFFER_ACT_DATA_STR, 
RESOURCE_TREE TYPE STRING,
DELETED_TREE TYPE STRING,
LOG_TEXT TYPE STRING,
LTEXT_SCREEN TYPE STRING,
LINE TYPE STRING,
LTEXT_HEADER TYPE STRING,
TDOBJECT TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
TDSPRAS TYPE STRING,
TDTITLE TYPE STRING,
TDFORM TYPE STRING,
TDSTYLE TYPE STRING,
TDVERSION TYPE STRING,
TDFUSER TYPE STRING,
TDFRELES TYPE STRING,
TDFDATE TYPE STRING,
TDFTIME TYPE STRING,
TDLUSER TYPE STRING,
TDLRELES TYPE STRING,
TDLDATE TYPE STRING,
TDLTIME TYPE STRING,
TDLINESIZE TYPE STRING,
TDTXTLINES TYPE STRING,
TDHYPHENAT TYPE STRING,
TDOSPRAS TYPE STRING,
TDTRANSTAT TYPE STRING,
TDMACODE1 TYPE STRING,
TDMACODE2 TYPE STRING,
TDREFOBJ TYPE STRING,
TDREFNAME TYPE STRING,
TDREFID TYPE STRING,
TDTEXTTYPE TYPE STRING,
TDCOMPRESS TYPE STRING,
MANDT TYPE STRING,
TDOCLASS TYPE STRING,
LOGSYS TYPE STRING,
LTEXT_LINES TYPE STRING,
LTEXT_READ TYPE STRING,
LTEXT_MODIFIED TYPE STRING,
ADDITIONALS TYPE STRING,
WITH_ASSIGNMENTS TYPE STRING,
WITH_MRS_DEMANDS TYPE STRING,
DEM_ITEM_ORDER TYPE STRING,
REM_EFFORT_TIME TYPE STRING,
REM_EFFORT_UNIT TYPE STRING,
START_PLNNG_ORIG TYPE STRING,
START_PLNNG_READ TYPE STRING,
DEL_DEM_READ TYPE STRING,
DELETED_DEMANDS TYPE STRING,
VBKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_ACT_BUFFER_ACT_DATA_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_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-RESOURCE_TREE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-DELETED_TREE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LOG_TEXT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LTEXT_SCREEN sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LINE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LTEXT_HEADER sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDOBJECT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDNAME sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDID sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDSPRAS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDTITLE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDFORM sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDSTYLE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDVERSION sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDFUSER sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDFRELES sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDFDATE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDFTIME sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDLUSER sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDLRELES sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDLDATE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDLTIME sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDLINESIZE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDTXTLINES sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDHYPHENAT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDOSPRAS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDTRANSTAT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDMACODE1 sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDMACODE2 sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDREFOBJ sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDREFNAME sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDREFID sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDTEXTTYPE sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDCOMPRESS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-MANDT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-TDOCLASS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LOGSYS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LTEXT_LINES sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LTEXT_READ sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-LTEXT_MODIFIED sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-ADDITIONALS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-WITH_ASSIGNMENTS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-WITH_MRS_DEMANDS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-DEM_ITEM_ORDER sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-REM_EFFORT_TIME sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-REM_EFFORT_UNIT sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-START_PLNNG_ORIG sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-START_PLNNG_READ sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-DEL_DEM_READ sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-DELETED_DEMANDS sy-vline 
WA_/MRSS/T_ACT_BUFFER_ACT_DATA_STR-VBKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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