ABAP Select data from SAP table RNT01 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNT01 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 RNT01. 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 RNT01 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_RNT01 TYPE STANDARD TABLE OF RNT01,
      WA_RNT01 TYPE RNT01,
      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: <RNT01> TYPE RNT01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNT01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNT01
  INTO TABLE IT_RNT01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNT01
*  INTO TABLE @DATA(IT_RNT012).
*--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_RNT01 INDEX 1 INTO DATA(WA_RNT012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNT01 ASSIGNING <RNT01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNT01>-EINRI = 1.
<RNT01>-ABART = 1.
<RNT01>-KTART = 1.
<RNT01>-KOSTR = 1.
<RNT01>-SEKZ = 1.

ENDLOOP.

LOOP AT IT_RNT01 INTO WA_RNT01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNT01-TARLS, sy-vline,
  WA_RNT01-ABROE, sy-vline,
  WA_RNT01-ERBOE, sy-vline,
  WA_RNT01-ANFOE, sy-vline,
  WA_RNT01-TARIF, sy-vline,
  WA_RNT01-ANFGP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNT01 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_RNT01 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_RNT01 INTO WA_RNT01.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ABART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ABART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-KTART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-KTART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARLS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-TARLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-TARLS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABROE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ABROE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ABROE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERBOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ERBOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ERBOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANFOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ANFOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ANFOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANFGP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ANFGP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ANFGP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANFTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-ANFTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-ANFTY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TAGRU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNT01-TAGRU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNT01-TAGRU.
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_RNT01_STR, 
EINRI TYPE STRING,
ABART TYPE STRING,
KTART TYPE STRING,
KOSTR TYPE STRING,
SEKZ TYPE STRING,
TARLS TYPE STRING,
ABROE TYPE STRING,
ERBOE TYPE STRING,
ANFOE TYPE STRING,
TARIF TYPE STRING,
ANFGP TYPE STRING,
ANFTY TYPE STRING,
TAGRU TYPE STRING,
BILLP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNT01_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_RNT01_STR-EINRI sy-vline 
WA_RNT01_STR-ABART sy-vline 
WA_RNT01_STR-KTART sy-vline 
WA_RNT01_STR-KOSTR sy-vline 
WA_RNT01_STR-SEKZ sy-vline 
WA_RNT01_STR-TARLS sy-vline 
WA_RNT01_STR-ABROE sy-vline 
WA_RNT01_STR-ERBOE sy-vline 
WA_RNT01_STR-ANFOE sy-vline 
WA_RNT01_STR-TARIF sy-vline 
WA_RNT01_STR-ANFGP sy-vline 
WA_RNT01_STR-ANFTY sy-vline 
WA_RNT01_STR-TAGRU sy-vline 
WA_RNT01_STR-BILLP sy-vline      INTO ld_text SEPARATED BY SPACE.

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