ABAP Select data from SAP table /SCWM/LDP_HIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/LDP_HIST
*  INTO TABLE @DATA(IT_/SCWM/LDP_HIST2).
*--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_/SCWM/LDP_HIST INDEX 1 INTO DATA(WA_/SCWM/LDP_HIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/LDP_HIST>-MANDT = 1.
</SCWM/LDP_HIST>-LGNUM = 1.
</SCWM/LDP_HIST>-HIST_ID = 1.
</SCWM/LDP_HIST>-PROCTY = 1.
</SCWM/LDP_HIST>-PRCES = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/LDP_HIST-PROCS, sy-vline,
  WA_/SCWM/LDP_HIST-IPROC, sy-vline,
  WA_/SCWM/LDP_HIST-ROUTE, sy-vline,
  WA_/SCWM/LDP_HIST-SAAREA, sy-vline,
  WA_/SCWM/LDP_HIST-DAAREA, sy-vline,
  WA_/SCWM/LDP_HIST-VLTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/LDP_HIST 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_/SCWM/LDP_HIST 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_/SCWM/LDP_HIST INTO WA_/SCWM/LDP_HIST.


*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 ENTITLED
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-ENTITLED
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-ENTITLED.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_V
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-UNIT_V
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-UNIT_V.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_W
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-UNIT_W
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-UNIT_W.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ALTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-ALTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-ALTME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-MEINS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field UNIT_T
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-UNIT_T
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-UNIT_T.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field START_ACT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-START_ACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-START_ACT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field FINISH_ACT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-FINISH_ACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-FINISH_ACT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field CREATED_AT
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-CREATED_AT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-CREATED_AT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPH0, internal->external for field TANUM
CALL FUNCTION 'CONVERSION_EXIT_ALPH0_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-TANUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-TANUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTWH, internal->external for field FORECAST_TS
CALL FUNCTION 'CONVERSION_EXIT_TSTWH_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/LDP_HIST-FORECAST_TS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/LDP_HIST-FORECAST_TS.
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_/SCWM/LDP_HIST_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
HIST_ID TYPE STRING,
PROCTY TYPE STRING,
PRCES TYPE STRING,
PROCS TYPE STRING,
IPROC TYPE STRING,
ROUTE TYPE STRING,
SAAREA TYPE STRING,
DAAREA TYPE STRING,
VLTYP TYPE STRING,
NLTYP TYPE STRING,
ENTITLED TYPE STRING,
VOLUM TYPE STRING,
UNIT_V TYPE STRING,
WEIGHT TYPE STRING,
UNIT_W TYPE STRING,
CAPA TYPE STRING,
QUANA TYPE STRING,
ALTME TYPE STRING,
QUANM TYPE STRING,
MEINS TYPE STRING,
QUANCLA TYPE STRING,
MATNR TYPE STRING,
WHMATGR TYPE STRING,
PRIORITY TYPE STRING,
DOCTYPE TYPE STRING,
ITEMTYPE TYPE STRING,
LDP_HIST_DUMMY TYPE STRING,
DURA_ACT TYPE STRING,
UNIT_T TYPE STRING,
START_ACT TYPE STRING,
FINISH_ACT TYPE STRING,
CREATED_AT TYPE STRING,
TANUM TYPE STRING,
FORECAST_TS TYPE STRING,
FORECAST_DT_WH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/LDP_HIST_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_/SCWM/LDP_HIST_STR-MANDT sy-vline 
WA_/SCWM/LDP_HIST_STR-LGNUM sy-vline 
WA_/SCWM/LDP_HIST_STR-HIST_ID sy-vline 
WA_/SCWM/LDP_HIST_STR-PROCTY sy-vline 
WA_/SCWM/LDP_HIST_STR-PRCES sy-vline 
WA_/SCWM/LDP_HIST_STR-PROCS sy-vline 
WA_/SCWM/LDP_HIST_STR-IPROC sy-vline 
WA_/SCWM/LDP_HIST_STR-ROUTE sy-vline 
WA_/SCWM/LDP_HIST_STR-SAAREA sy-vline 
WA_/SCWM/LDP_HIST_STR-DAAREA sy-vline 
WA_/SCWM/LDP_HIST_STR-VLTYP sy-vline 
WA_/SCWM/LDP_HIST_STR-NLTYP sy-vline 
WA_/SCWM/LDP_HIST_STR-ENTITLED sy-vline 
WA_/SCWM/LDP_HIST_STR-VOLUM sy-vline 
WA_/SCWM/LDP_HIST_STR-UNIT_V sy-vline 
WA_/SCWM/LDP_HIST_STR-WEIGHT sy-vline 
WA_/SCWM/LDP_HIST_STR-UNIT_W sy-vline 
WA_/SCWM/LDP_HIST_STR-CAPA sy-vline 
WA_/SCWM/LDP_HIST_STR-QUANA sy-vline 
WA_/SCWM/LDP_HIST_STR-ALTME sy-vline 
WA_/SCWM/LDP_HIST_STR-QUANM sy-vline 
WA_/SCWM/LDP_HIST_STR-MEINS sy-vline 
WA_/SCWM/LDP_HIST_STR-QUANCLA sy-vline 
WA_/SCWM/LDP_HIST_STR-MATNR sy-vline 
WA_/SCWM/LDP_HIST_STR-WHMATGR sy-vline 
WA_/SCWM/LDP_HIST_STR-PRIORITY sy-vline 
WA_/SCWM/LDP_HIST_STR-DOCTYPE sy-vline 
WA_/SCWM/LDP_HIST_STR-ITEMTYPE sy-vline 
WA_/SCWM/LDP_HIST_STR-LDP_HIST_DUMMY sy-vline 
WA_/SCWM/LDP_HIST_STR-DURA_ACT sy-vline 
WA_/SCWM/LDP_HIST_STR-UNIT_T sy-vline 
WA_/SCWM/LDP_HIST_STR-START_ACT sy-vline 
WA_/SCWM/LDP_HIST_STR-FINISH_ACT sy-vline 
WA_/SCWM/LDP_HIST_STR-CREATED_AT sy-vline 
WA_/SCWM/LDP_HIST_STR-TANUM sy-vline 
WA_/SCWM/LDP_HIST_STR-FORECAST_TS sy-vline 
WA_/SCWM/LDP_HIST_STR-FORECAST_DT_WH sy-vline      INTO ld_text SEPARATED BY SPACE.

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