ABAP Select data from SAP table P20_RMB_MAIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P20_RMB_MAIN 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 P20_RMB_MAIN. 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 P20_RMB_MAIN 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_P20_RMB_MAIN TYPE STANDARD TABLE OF P20_RMB_MAIN,
      WA_P20_RMB_MAIN TYPE P20_RMB_MAIN,
      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: <P20_RMB_MAIN> TYPE P20_RMB_MAIN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P20_RMB_MAIN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P20_RMB_MAIN
  INTO TABLE IT_P20_RMB_MAIN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P20_RMB_MAIN
*  INTO TABLE @DATA(IT_P20_RMB_MAIN2).
*--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_P20_RMB_MAIN INDEX 1 INTO DATA(WA_P20_RMB_MAIN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P20_RMB_MAIN ASSIGNING <P20_RMB_MAIN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P20_RMB_MAIN>-FTYPE = 1.
<P20_RMB_MAIN>-TBEDA = 1.
<P20_RMB_MAIN>-TENDA = 1.
<P20_RMB_MAIN>-HRSTS = 1.
<P20_RMB_MAIN>-MXDAT = 1.

ENDLOOP.

LOOP AT IT_P20_RMB_MAIN INTO WA_P20_RMB_MAIN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P20_RMB_MAIN-STUAB, sy-vline,
  WA_P20_RMB_MAIN-ENUAB, sy-vline,
  WA_P20_RMB_MAIN-ENAVN, sy-vline,
  WA_P20_RMB_MAIN-FNAVN, sy-vline,
  WA_P20_RMB_MAIN-BOKOM, sy-vline,
  WA_P20_RMB_MAIN-FDNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P20_RMB_MAIN 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_P20_RMB_MAIN 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_P20_RMB_MAIN INTO WA_P20_RMB_MAIN.


*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_P20_RMB_MAIN_STR, 
FTYPE TYPE STRING,
TBEDA TYPE STRING,
TENDA TYPE STRING,
HRSTS TYPE STRING,
MXDAT TYPE STRING,
STUAB TYPE STRING,
ENUAB TYPE STRING,
ENAVN TYPE STRING,
FNAVN TYPE STRING,
BOKOM TYPE STRING,
FDNUM TYPE STRING,
RTYPE TYPE STRING,
SJOEM TYPE STRING,
STSER TYPE STRING,
YRKE TYPE STRING,
YRKET TYPE STRING,
TERDT TYPE STRING,
PSDAT TYPE STRING,
PSAMT TYPE STRING,
FWDAA TYPE STRING,
STVAC TYPE STRING,
ENVAC TYPE STRING,
STEMP TYPE STRING,
ENEMP TYPE STRING,
APAMT TYPE STRING,
ERZONE TYPE STRING,
FRITAK TYPE STRING,
KONUM TYPE STRING,
ZEINH TYPE STRING,
TAMNT TYPE STRING,
PWTYP TYPE STRING,
PWTXT TYPE STRING,
PVALU TYPE STRING,
REWTY TYPE STRING,
STDMC TYPE STRING,
ENDMC TYPE STRING,
TAXMUNIC TYPE STRING,
TAXTABNO TYPE STRING,
PETAX TYPE STRING,
NOTAX TYPE STRING,
V1NAM TYPE STRING,
V1AMT TYPE STRING,
V2NAM TYPE STRING,
V2AMT TYPE STRING,
V3NAM TYPE STRING,
V3AMT TYPE STRING,
V4NAM TYPE STRING,
V4AMT TYPE STRING,
ERADR TYPE STRING,
ERTEL TYPE STRING,
ORGNO TYPE STRING,
PRDAT TYPE STRING,
EEADR TYPE STRING,
WEPAY TYPE STRING,
ERCAMT TYPE STRING,
BAPERC TYPE STRING,
EMAIL TYPE STRING,
HELEP TYPE STRING,
RSTOP TYPE STRING,
N3002 TYPE STRING,
STABS TYPE STRING,
FIXBAS TYPE STRING,
VARBAS TYPE STRING,
PSCHEME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P20_RMB_MAIN_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_P20_RMB_MAIN_STR-FTYPE sy-vline 
WA_P20_RMB_MAIN_STR-TBEDA sy-vline 
WA_P20_RMB_MAIN_STR-TENDA sy-vline 
WA_P20_RMB_MAIN_STR-HRSTS sy-vline 
WA_P20_RMB_MAIN_STR-MXDAT sy-vline 
WA_P20_RMB_MAIN_STR-STUAB sy-vline 
WA_P20_RMB_MAIN_STR-ENUAB sy-vline 
WA_P20_RMB_MAIN_STR-ENAVN sy-vline 
WA_P20_RMB_MAIN_STR-FNAVN sy-vline 
WA_P20_RMB_MAIN_STR-BOKOM sy-vline 
WA_P20_RMB_MAIN_STR-FDNUM sy-vline 
WA_P20_RMB_MAIN_STR-RTYPE sy-vline 
WA_P20_RMB_MAIN_STR-SJOEM sy-vline 
WA_P20_RMB_MAIN_STR-STSER sy-vline 
WA_P20_RMB_MAIN_STR-YRKE sy-vline 
WA_P20_RMB_MAIN_STR-YRKET sy-vline 
WA_P20_RMB_MAIN_STR-TERDT sy-vline 
WA_P20_RMB_MAIN_STR-PSDAT sy-vline 
WA_P20_RMB_MAIN_STR-PSAMT sy-vline 
WA_P20_RMB_MAIN_STR-FWDAA sy-vline 
WA_P20_RMB_MAIN_STR-STVAC sy-vline 
WA_P20_RMB_MAIN_STR-ENVAC sy-vline 
WA_P20_RMB_MAIN_STR-STEMP sy-vline 
WA_P20_RMB_MAIN_STR-ENEMP sy-vline 
WA_P20_RMB_MAIN_STR-APAMT sy-vline 
WA_P20_RMB_MAIN_STR-ERZONE sy-vline 
WA_P20_RMB_MAIN_STR-FRITAK sy-vline 
WA_P20_RMB_MAIN_STR-KONUM sy-vline 
WA_P20_RMB_MAIN_STR-ZEINH sy-vline 
WA_P20_RMB_MAIN_STR-TAMNT sy-vline 
WA_P20_RMB_MAIN_STR-PWTYP sy-vline 
WA_P20_RMB_MAIN_STR-PWTXT sy-vline 
WA_P20_RMB_MAIN_STR-PVALU sy-vline 
WA_P20_RMB_MAIN_STR-REWTY sy-vline 
WA_P20_RMB_MAIN_STR-STDMC sy-vline 
WA_P20_RMB_MAIN_STR-ENDMC sy-vline 
WA_P20_RMB_MAIN_STR-TAXMUNIC sy-vline 
WA_P20_RMB_MAIN_STR-TAXTABNO sy-vline 
WA_P20_RMB_MAIN_STR-PETAX sy-vline 
WA_P20_RMB_MAIN_STR-NOTAX sy-vline 
WA_P20_RMB_MAIN_STR-V1NAM sy-vline 
WA_P20_RMB_MAIN_STR-V1AMT sy-vline 
WA_P20_RMB_MAIN_STR-V2NAM sy-vline 
WA_P20_RMB_MAIN_STR-V2AMT sy-vline 
WA_P20_RMB_MAIN_STR-V3NAM sy-vline 
WA_P20_RMB_MAIN_STR-V3AMT sy-vline 
WA_P20_RMB_MAIN_STR-V4NAM sy-vline 
WA_P20_RMB_MAIN_STR-V4AMT sy-vline 
WA_P20_RMB_MAIN_STR-ERADR sy-vline 
WA_P20_RMB_MAIN_STR-ERTEL sy-vline 
WA_P20_RMB_MAIN_STR-ORGNO sy-vline 
WA_P20_RMB_MAIN_STR-PRDAT sy-vline 
WA_P20_RMB_MAIN_STR-EEADR sy-vline 
WA_P20_RMB_MAIN_STR-WEPAY sy-vline 
WA_P20_RMB_MAIN_STR-ERCAMT sy-vline 
WA_P20_RMB_MAIN_STR-BAPERC sy-vline 
WA_P20_RMB_MAIN_STR-EMAIL sy-vline 
WA_P20_RMB_MAIN_STR-HELEP sy-vline 
WA_P20_RMB_MAIN_STR-RSTOP sy-vline 
WA_P20_RMB_MAIN_STR-N3002 sy-vline 
WA_P20_RMB_MAIN_STR-STABS sy-vline 
WA_P20_RMB_MAIN_STR-FIXBAS sy-vline 
WA_P20_RMB_MAIN_STR-VARBAS sy-vline 
WA_P20_RMB_MAIN_STR-PSCHEME sy-vline      INTO ld_text SEPARATED BY SPACE.

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