ABAP Select data from SAP table TN01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN01 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 TN01. 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 TN01 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_TN01 TYPE STANDARD TABLE OF TN01,
      WA_TN01 TYPE TN01,
      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: <TN01> TYPE TN01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN01
  INTO TABLE IT_TN01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN01
*  INTO TABLE @DATA(IT_TN012).
*--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_TN01 INDEX 1 INTO DATA(WA_TN012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN01 ASSIGNING <TN01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN01>-MANDT = 1.
<TN01>-EINRI = 1.
<TN01>-EINKB = 1.
<TN01>-EINBZ = 1.
<TN01>-BUKRS = 1.

ENDLOOP.

LOOP AT IT_TN01 INTO WA_TN01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN01-GSBER, sy-vline,
  WA_TN01-LAND, sy-vline,
  WA_TN01-PSTLZ, sy-vline,
  WA_TN01-ORT, sy-vline,
  WA_TN01-ORT2, sy-vline,
  WA_TN01-STRAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TN01 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_TN01 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_TN01 INTO WA_TN01.


*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_TN01-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-INSTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-INSTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-ADRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HCAT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-HCAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-HCAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ASL_INSTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-ASL_INSTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-ASL_INSTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field /ISHFR/CO_INSTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-/ISHFR/CO_INSTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-/ISHFR/CO_INSTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field /ISHFR/LEGST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-/ISHFR/LEGST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-/ISHFR/LEGST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field /ISHFR/PRDM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN01-/ISHFR/PRDM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN01-/ISHFR/PRDM.
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_TN01_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
EINKB TYPE STRING,
EINBZ TYPE STRING,
BUKRS TYPE STRING,
GSBER TYPE STRING,
LAND TYPE STRING,
PSTLZ TYPE STRING,
ORT TYPE STRING,
ORT2 TYPE STRING,
STRAS TYPE STRING,
INSTNR TYPE STRING,
TELF1 TYPE STRING,
TELFX TYPE STRING,
TELTX TYPE STRING,
SPRAS TYPE STRING,
ARCHIV TYPE STRING,
VKORG TYPE STRING,
WERKS TYPE STRING,
KHNUM TYPE STRING,
PRODKZ TYPE STRING,
ADRNR TYPE STRING,
ADROB TYPE STRING,
HCAT TYPE STRING,
EANR TYPE STRING,
ZSRNR TYPE STRING,
NIFNR TYPE STRING,
OBJID TYPE STRING,
PKV TYPE STRING,
ASL_INSTN TYPE STRING,
/ISHFR/CO_INSTNR TYPE STRING,
/ISHFR/LEGST TYPE STRING,
/ISHFR/PRDM TYPE STRING,
/ISHFR/PTID TYPE STRING,
/ISHFR/PTHID TYPE STRING,
/ISHFR/PTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN01_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_TN01_STR-MANDT sy-vline 
WA_TN01_STR-EINRI sy-vline 
WA_TN01_STR-EINKB sy-vline 
WA_TN01_STR-EINBZ sy-vline 
WA_TN01_STR-BUKRS sy-vline 
WA_TN01_STR-GSBER sy-vline 
WA_TN01_STR-LAND sy-vline 
WA_TN01_STR-PSTLZ sy-vline 
WA_TN01_STR-ORT sy-vline 
WA_TN01_STR-ORT2 sy-vline 
WA_TN01_STR-STRAS sy-vline 
WA_TN01_STR-INSTNR sy-vline 
WA_TN01_STR-TELF1 sy-vline 
WA_TN01_STR-TELFX sy-vline 
WA_TN01_STR-TELTX sy-vline 
WA_TN01_STR-SPRAS sy-vline 
WA_TN01_STR-ARCHIV sy-vline 
WA_TN01_STR-VKORG sy-vline 
WA_TN01_STR-WERKS sy-vline 
WA_TN01_STR-KHNUM sy-vline 
WA_TN01_STR-PRODKZ sy-vline 
WA_TN01_STR-ADRNR sy-vline 
WA_TN01_STR-ADROB sy-vline 
WA_TN01_STR-HCAT sy-vline 
WA_TN01_STR-EANR sy-vline 
WA_TN01_STR-ZSRNR sy-vline 
WA_TN01_STR-NIFNR sy-vline 
WA_TN01_STR-OBJID sy-vline 
WA_TN01_STR-PKV sy-vline 
WA_TN01_STR-ASL_INSTN sy-vline 
WA_TN01_STR-/ISHFR/CO_INSTNR sy-vline 
WA_TN01_STR-/ISHFR/LEGST sy-vline 
WA_TN01_STR-/ISHFR/PRDM sy-vline 
WA_TN01_STR-/ISHFR/PTID sy-vline 
WA_TN01_STR-/ISHFR/PTHID sy-vline 
WA_TN01_STR-/ISHFR/PTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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