ABAP Select data from SAP table FMFG_BLCORR_SELSCREEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMFG_BLCORR_SELSCREEN
*  INTO TABLE @DATA(IT_FMFG_BLCORR_SELSCREEN2).
*--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_FMFG_BLCORR_SELSCREEN INDEX 1 INTO DATA(WA_FMFG_BLCORR_SELSCREEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMFG_BLCORR_SELSCREEN>-FIKRS = 1.
<FMFG_BLCORR_SELSCREEN>-BUKRS = 1.
<FMFG_BLCORR_SELSCREEN>-GJAHR = 1.
<FMFG_BLCORR_SELSCREEN>-ZHLDT = 1.
<FMFG_BLCORR_SELSCREEN>-P_BLDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMFG_BLCORR_SELSCREEN-P_BUDT, sy-vline,
  WA_FMFG_BLCORR_SELSCREEN-P_PER, sy-vline,
  WA_FMFG_BLCORR_SELSCREEN-P_YEAR, sy-vline,
  WA_FMFG_BLCORR_SELSCREEN-BTART, sy-vline,
  WA_FMFG_BLCORR_SELSCREEN-TRANR, sy-vline,
  WA_FMFG_BLCORR_SELSCREEN-VREFBT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMFG_BLCORR_SELSCREEN 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_FMFG_BLCORR_SELSCREEN 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_FMFG_BLCORR_SELSCREEN INTO WA_FMFG_BLCORR_SELSCREEN.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FMFG_BLCORR_SELSCREEN-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMFG_BLCORR_SELSCREEN-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field P_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FMFG_BLCORR_SELSCREEN-P_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMFG_BLCORR_SELSCREEN-P_YEAR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field BUDDOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FMFG_BLCORR_SELSCREEN-BUDDOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMFG_BLCORR_SELSCREEN-BUDDOC.
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_FMFG_BLCORR_SELSCREEN_STR, 
FIKRS TYPE STRING,
BUKRS TYPE STRING,
GJAHR TYPE STRING,
ZHLDT TYPE STRING,
P_BLDT TYPE STRING,
P_BUDT TYPE STRING,
P_PER TYPE STRING,
P_YEAR TYPE STRING,
BTART TYPE STRING,
TRANR TYPE STRING,
VREFBT TYPE STRING,
VREFBN TYPE STRING,
REFBT TYPE STRING,
REFBN TYPE STRING,
WRTTP TYPE STRING,
FMBELNR TYPE STRING,
KNBELNR TYPE STRING,
VOBELNR TYPE STRING,
REFDOC TYPE STRING,
DOCNR TYPE STRING,
MATDOC TYPE STRING,
BUDDOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMFG_BLCORR_SELSCREEN_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_FMFG_BLCORR_SELSCREEN_STR-FIKRS sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-BUKRS sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-GJAHR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-ZHLDT sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-P_BLDT sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-P_BUDT sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-P_PER sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-P_YEAR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-BTART sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-TRANR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-VREFBT sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-VREFBN sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-REFBT sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-REFBN sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-WRTTP sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-FMBELNR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-KNBELNR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-VOBELNR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-REFDOC sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-DOCNR sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-MATDOC sy-vline 
WA_FMFG_BLCORR_SELSCREEN_STR-BUDDOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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