ABAP Select data from SAP table VEC_S_DYN_PERIOD_CATEGORY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VEC_S_DYN_PERIOD_CATEGORY
*  INTO TABLE @DATA(IT_VEC_S_DYN_PERIOD_CATEGORY2).
*--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_VEC_S_DYN_PERIOD_CATEGORY INDEX 1 INTO DATA(WA_VEC_S_DYN_PERIOD_CATEGORY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VEC_S_DYN_PERIOD_CATEGORY>-PC_ID = 1.
<VEC_S_DYN_PERIOD_CATEGORY>-MON01 = 1.
<VEC_S_DYN_PERIOD_CATEGORY>-MON02 = 1.
<VEC_S_DYN_PERIOD_CATEGORY>-MON03 = 1.
<VEC_S_DYN_PERIOD_CATEGORY>-MON04 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VEC_S_DYN_PERIOD_CATEGORY-MON05, sy-vline,
  WA_VEC_S_DYN_PERIOD_CATEGORY-MON06, sy-vline,
  WA_VEC_S_DYN_PERIOD_CATEGORY-MON07, sy-vline,
  WA_VEC_S_DYN_PERIOD_CATEGORY-MON08, sy-vline,
  WA_VEC_S_DYN_PERIOD_CATEGORY-MON09, sy-vline,
  WA_VEC_S_DYN_PERIOD_CATEGORY-MON10, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VEC_S_DYN_PERIOD_CATEGORY 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_VEC_S_DYN_PERIOD_CATEGORY 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_VEC_S_DYN_PERIOD_CATEGORY INTO WA_VEC_S_DYN_PERIOD_CATEGORY.


*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_VEC_S_DYN_PERIOD_CATEGORY_STR, 
PC_ID TYPE STRING,
MON01 TYPE STRING,
MON02 TYPE STRING,
MON03 TYPE STRING,
MON04 TYPE STRING,
MON05 TYPE STRING,
MON06 TYPE STRING,
MON07 TYPE STRING,
MON08 TYPE STRING,
MON09 TYPE STRING,
MON10 TYPE STRING,
MON11 TYPE STRING,
MON12 TYPE STRING,
MON13 TYPE STRING,
MON14 TYPE STRING,
MON15 TYPE STRING,
MON16 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VEC_S_DYN_PERIOD_CATEGORY_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_VEC_S_DYN_PERIOD_CATEGORY_STR-PC_ID sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON01 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON02 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON03 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON04 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON05 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON06 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON07 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON08 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON09 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON10 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON11 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON12 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON13 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON14 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON15 sy-vline 
WA_VEC_S_DYN_PERIOD_CATEGORY_STR-MON16 sy-vline      INTO ld_text SEPARATED BY SPACE.

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