ABAP Select data from SAP table ISPFORECASTMONTH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ISPFORECASTMONTH 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 ISPFORECASTMONTH. 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 ISPFORECASTMONTH 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_ISPFORECASTMONTH TYPE STANDARD TABLE OF ISPFORECASTMONTH,
      WA_ISPFORECASTMONTH TYPE ISPFORECASTMONTH,
      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: <ISPFORECASTMONTH> TYPE ISPFORECASTMONTH.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ISPFORECASTMONTH
  INTO TABLE IT_ISPFORECASTMONTH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISPFORECASTMONTH
*  INTO TABLE @DATA(IT_ISPFORECASTMONTH2).
*--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_ISPFORECASTMONTH INDEX 1 INTO DATA(WA_ISPFORECASTMONTH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ISPFORECASTMONTH ASSIGNING <ISPFORECASTMONTH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISPFORECASTMONTH>-MANDT = 1.
<ISPFORECASTMONTH>-PRODUCTUUID = 1.
<ISPFORECASTMONTH>-WAREHOUSELOCATIONUUID = 1.
<ISPFORECASTMONTH>-SRVCPARTSKEYFIGURE = 1.
<ISPFORECASTMONTH>-SRVCPARTSLOCATIONISVRTLCHILDPT = 1.

ENDLOOP.

LOOP AT IT_ISPFORECASTMONTH INTO WA_ISPFORECASTMONTH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISPFORECASTMONTH-ESPPPERIODFROMDATETIME, sy-vline,
  WA_ISPFORECASTMONTH-ESPPPERIODTODATETIME, sy-vline,
  WA_ISPFORECASTMONTH-ESPPPERIODCLUSTER, sy-vline,
  WA_ISPFORECASTMONTH-PRODUCT, sy-vline,
  WA_ISPFORECASTMONTH-LOCATION, sy-vline,
  WA_ISPFORECASTMONTH-BASEUNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISPFORECASTMONTH 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_ISPFORECASTMONTH 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_ISPFORECASTMONTH INTO WA_ISPFORECASTMONTH.


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

*Conversion exit CUNIT, internal->external for field BASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ISPFORECASTMONTH-BASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISPFORECASTMONTH-BASEUNIT.
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_ISPFORECASTMONTH_STR, 
MANDT TYPE STRING,
PRODUCTUUID TYPE STRING,
WAREHOUSELOCATIONUUID TYPE STRING,
SRVCPARTSKEYFIGURE TYPE STRING,
SRVCPARTSLOCATIONISVRTLCHILDPT TYPE STRING,
ESPPPERIODFROMDATETIME TYPE STRING,
ESPPPERIODTODATETIME TYPE STRING,
ESPPPERIODCLUSTER TYPE STRING,
PRODUCT TYPE STRING,
LOCATION TYPE STRING,
BASEUNIT TYPE STRING,
ZEROVALUESARESAVED TYPE STRING,
ESPPFORECASTQUANTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISPFORECASTMONTH_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_ISPFORECASTMONTH_STR-MANDT sy-vline 
WA_ISPFORECASTMONTH_STR-PRODUCTUUID sy-vline 
WA_ISPFORECASTMONTH_STR-WAREHOUSELOCATIONUUID sy-vline 
WA_ISPFORECASTMONTH_STR-SRVCPARTSKEYFIGURE sy-vline 
WA_ISPFORECASTMONTH_STR-SRVCPARTSLOCATIONISVRTLCHILDPT sy-vline 
WA_ISPFORECASTMONTH_STR-ESPPPERIODFROMDATETIME sy-vline 
WA_ISPFORECASTMONTH_STR-ESPPPERIODTODATETIME sy-vline 
WA_ISPFORECASTMONTH_STR-ESPPPERIODCLUSTER sy-vline 
WA_ISPFORECASTMONTH_STR-PRODUCT sy-vline 
WA_ISPFORECASTMONTH_STR-LOCATION sy-vline 
WA_ISPFORECASTMONTH_STR-BASEUNIT sy-vline 
WA_ISPFORECASTMONTH_STR-ZEROVALUESARESAVED sy-vline 
WA_ISPFORECASTMONTH_STR-ESPPFORECASTQUANTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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