ABAP Select data from SAP table FMRB_S_MAINT_SCREEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMRB_S_MAINT_SCREEN
*  INTO TABLE @DATA(IT_FMRB_S_MAINT_SCREEN2).
*--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_FMRB_S_MAINT_SCREEN INDEX 1 INTO DATA(WA_FMRB_S_MAINT_SCREEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMRB_S_MAINT_SCREEN>-FM_AREA = 1.
<FMRB_S_MAINT_SCREEN>-FISCYEAR = 1.
<FMRB_S_MAINT_SCREEN>-CEFFYEAR = 1.
<FMRB_S_MAINT_SCREEN>-RBBLDNR = 1.
<FMRB_S_MAINT_SCREEN>-RBBLDNR_TEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMRB_S_MAINT_SCREEN-GRANT_NBR, sy-vline,
  WA_FMRB_S_MAINT_SCREEN-FUND, sy-vline,
  WA_FMRB_S_MAINT_SCREEN-BUDGET_PD, sy-vline,
  WA_FMRB_S_MAINT_SCREEN-FUNDSCTR, sy-vline,
  WA_FMRB_S_MAINT_SCREEN-CMMTITEM, sy-vline,
  WA_FMRB_S_MAINT_SCREEN-FUNCAREA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMRB_S_MAINT_SCREEN 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_FMRB_S_MAINT_SCREEN 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_FMRB_S_MAINT_SCREEN INTO WA_FMRB_S_MAINT_SCREEN.


*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 FISCYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FMRB_S_MAINT_SCREEN-FISCYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMRB_S_MAINT_SCREEN-FISCYEAR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit FMCIL, internal->external for field CMMTITEM
CALL FUNCTION 'CONVERSION_EXIT_FMCIL_OUTPUT'
  EXPORTING
    input =                      WA_FMRB_S_MAINT_SCREEN-CMMTITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMRB_S_MAINT_SCREEN-CMMTITEM.
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_FMRB_S_MAINT_SCREEN_STR, 
FM_AREA TYPE STRING,
FISCYEAR TYPE STRING,
CEFFYEAR TYPE STRING,
RBBLDNR TYPE STRING,
RBBLDNR_TEXT TYPE STRING,
GRANT_NBR TYPE STRING,
FUND TYPE STRING,
BUDGET_PD TYPE STRING,
FUNDSCTR TYPE STRING,
CMMTITEM TYPE STRING,
FUNCAREA TYPE STRING,
MEASURE TYPE STRING,
USERDIM TYPE STRING,
CRTUSER TYPE STRING,
CRTDATE TYPE STRING,
CRTTIME TYPE STRING,
CHGUSER TYPE STRING,
CHGDATE TYPE STRING,
CHGTIME TYPE STRING,
ROACTSTAT TYPE STRING,
ROACTSTAT_TEXT TYPE STRING,
UPDFILT TYPE STRING,
UPDFILT_TEXT TYPE STRING,
CALCRULE TYPE STRING,
CALCRULE_TEXT TYPE STRING,
RESAMNTIND TYPE STRING,
MANUALCHECKIND TYPE STRING,
BM_REVENUE_PART TYPE STRING,
BM_EXPENDIT_PART TYPE STRING,
BM_REVENUE_PART_TEXT TYPE STRING,
BM_EXPENDIT_PART_TEXT TYPE STRING,
CVRGRP TYPE STRING,
RIB_PROCEDURE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMRB_S_MAINT_SCREEN_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_FMRB_S_MAINT_SCREEN_STR-FM_AREA sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-FISCYEAR sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CEFFYEAR sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-RBBLDNR sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-RBBLDNR_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-GRANT_NBR sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-FUND sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-BUDGET_PD sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-FUNDSCTR sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CMMTITEM sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-FUNCAREA sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-MEASURE sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-USERDIM sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CRTUSER sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CRTDATE sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CRTTIME sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CHGUSER sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CHGDATE sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CHGTIME sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-ROACTSTAT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-ROACTSTAT_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-UPDFILT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-UPDFILT_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CALCRULE sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CALCRULE_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-RESAMNTIND sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-MANUALCHECKIND sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-BM_REVENUE_PART sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-BM_EXPENDIT_PART sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-BM_REVENUE_PART_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-BM_EXPENDIT_PART_TEXT sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-CVRGRP sy-vline 
WA_FMRB_S_MAINT_SCREEN_STR-RIB_PROCEDURE sy-vline      INTO ld_text SEPARATED BY SPACE.

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