ABAP Select data from SAP table RN1LA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1LA 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 RN1LA. 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 RN1LA 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_RN1LA TYPE STANDARD TABLE OF RN1LA,
      WA_RN1LA TYPE RN1LA,
      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: <RN1LA> TYPE RN1LA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1LA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1LA
  INTO TABLE IT_RN1LA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1LA
*  INTO TABLE @DATA(IT_RN1LA2).
*--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_RN1LA INDEX 1 INTO DATA(WA_RN1LA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1LA ASSIGNING <RN1LA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1LA>-BEHTX_P = 1.
<RN1LA>-ERLTX_P = 1.
<RN1LA>-ANFOE = 1.
<RN1LA>-ERBOE = 1.
<RN1LA>-ANFTY = 1.

ENDLOOP.

LOOP AT IT_RN1LA INTO WA_RN1LA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1LA-ANFNR, sy-vline,
  WA_RN1LA-ANSTAE, sy-vline,
  WA_RN1LA-ANPOE, sy-vline,
  WA_RN1LA-GPART, sy-vline,
  WA_RN1LA-PNAME, sy-vline,
  WA_RN1LA-APRIE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1LA 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_RN1LA 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_RN1LA INTO WA_RN1LA.


*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 ALPHA, internal->external for field ANFOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-ANFOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-ANFOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERBOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-ERBOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-ERBOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANPOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-ANPOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-ANPOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ZIMMR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN1LA-ZIMMR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN1LA-ZIMMR.
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_RN1LA_STR, 
BEHTX_P TYPE STRING,
ERLTX_P TYPE STRING,
ANFOE TYPE STRING,
ERBOE TYPE STRING,
ANFTY TYPE STRING,
ANFNR TYPE STRING,
ANSTAE TYPE STRING,
ANPOE TYPE STRING,
GPART TYPE STRING,
PNAME TYPE STRING,
APRIE TYPE STRING,
EINRI TYPE STRING,
APRI TYPE STRING,
RCKRUF TYPE STRING,
WBZPE TYPE STRING,
ZIMMR TYPE STRING,
DAUER TYPE STRING,
IFGE TYPE STRING,
ANERF TYPE STRING,
PATEIN TYPE STRING,
PMEDFG TYPE STRING,
PMEDVS TYPE STRING,
BHANF TYPE STRING,
BHATX TYPE STRING,
ANFID TYPE STRING,
PZMAN TYPE STRING,
ZPIE TYPE STRING,
FALAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1LA_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_RN1LA_STR-BEHTX_P sy-vline 
WA_RN1LA_STR-ERLTX_P sy-vline 
WA_RN1LA_STR-ANFOE sy-vline 
WA_RN1LA_STR-ERBOE sy-vline 
WA_RN1LA_STR-ANFTY sy-vline 
WA_RN1LA_STR-ANFNR sy-vline 
WA_RN1LA_STR-ANSTAE sy-vline 
WA_RN1LA_STR-ANPOE sy-vline 
WA_RN1LA_STR-GPART sy-vline 
WA_RN1LA_STR-PNAME sy-vline 
WA_RN1LA_STR-APRIE sy-vline 
WA_RN1LA_STR-EINRI sy-vline 
WA_RN1LA_STR-APRI sy-vline 
WA_RN1LA_STR-RCKRUF sy-vline 
WA_RN1LA_STR-WBZPE sy-vline 
WA_RN1LA_STR-ZIMMR sy-vline 
WA_RN1LA_STR-DAUER sy-vline 
WA_RN1LA_STR-IFGE sy-vline 
WA_RN1LA_STR-ANERF sy-vline 
WA_RN1LA_STR-PATEIN sy-vline 
WA_RN1LA_STR-PMEDFG sy-vline 
WA_RN1LA_STR-PMEDVS sy-vline 
WA_RN1LA_STR-BHANF sy-vline 
WA_RN1LA_STR-BHATX sy-vline 
WA_RN1LA_STR-ANFID sy-vline 
WA_RN1LA_STR-PZMAN sy-vline 
WA_RN1LA_STR-ZPIE sy-vline 
WA_RN1LA_STR-FALAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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