ABAP Select data from SAP table TNA30B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNA30B 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 TNA30B. 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 TNA30B 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_TNA30B TYPE STANDARD TABLE OF TNA30B,
      WA_TNA30B TYPE TNA30B,
      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: <TNA30B> TYPE TNA30B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNA30B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNA30B
  INTO TABLE IT_TNA30B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNA30B
*  INTO TABLE @DATA(IT_TNA30B2).
*--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_TNA30B INDEX 1 INTO DATA(WA_TNA30B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNA30B ASSIGNING <TNA30B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNA30B>-MANDT = 1.
<TNA30B>-EINRI = 1.
<TNA30B>-SELID = 1.
<TNA30B>-SYBAK = 1.
<TNA30B>-SYBSK = 1.

ENDLOOP.

LOOP AT IT_TNA30B INTO WA_TNA30B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNA30B-TABAK, sy-vline,
  WA_TNA30B-TABSK, sy-vline,
  WA_TNA30B-TARIF, sy-vline,
  WA_TNA30B-TALST, sy-vline,
  WA_TNA30B-BFORP, sy-vline,
  WA_TNA30B-BFORB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNA30B 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_TNA30B 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_TNA30B INTO WA_TNA30B.


*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_TNA30B-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNA30B-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNA30B-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNA30B-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNA30B-TALST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNA30B-TALST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BFORP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNA30B-BFORP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNA30B-BFORP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BFORB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNA30B-BFORB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNA30B-BFORB.
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_TNA30B_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
SELID TYPE STRING,
SYBAK TYPE STRING,
SYBSK TYPE STRING,
TABAK TYPE STRING,
TABSK TYPE STRING,
TARIF TYPE STRING,
TALST TYPE STRING,
BFORP TYPE STRING,
BFORB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNA30B_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_TNA30B_STR-MANDT sy-vline 
WA_TNA30B_STR-EINRI sy-vline 
WA_TNA30B_STR-SELID sy-vline 
WA_TNA30B_STR-SYBAK sy-vline 
WA_TNA30B_STR-SYBSK sy-vline 
WA_TNA30B_STR-TABAK sy-vline 
WA_TNA30B_STR-TABSK sy-vline 
WA_TNA30B_STR-TARIF sy-vline 
WA_TNA30B_STR-TALST sy-vline 
WA_TNA30B_STR-BFORP sy-vline 
WA_TNA30B_STR-BFORB sy-vline      INTO ld_text SEPARATED BY SPACE.

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