ABAP Select data from SAP table TN22D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN22D 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 TN22D. 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 TN22D 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_TN22D TYPE STANDARD TABLE OF TN22D,
      WA_TN22D TYPE TN22D,
      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: <TN22D> TYPE TN22D.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN22D.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN22D
  INTO TABLE IT_TN22D.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN22D
*  INTO TABLE @DATA(IT_TN22D2).
*--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_TN22D INDEX 1 INTO DATA(WA_TN22D2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN22D ASSIGNING <TN22D>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN22D>-MANDT = 1.
<TN22D>-EINRI = 1.
<TN22D>-VERWE = 1.
<TN22D>-ABART = 1.
<TN22D>-ENDDT = 1.

ENDLOOP.

LOOP AT IT_TN22D INTO WA_TN22D.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN22D-BEGDT, sy-vline,
  WA_TN22D-MAHN, sy-vline,
  WA_TN22D-TARIF, sy-vline,
  WA_TN22D-TALST1, sy-vline,
  WA_TN22D-TALST2, sy-vline,
  WA_TN22D-TALST3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TN22D 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_TN22D 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_TN22D INTO WA_TN22D.


*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_TN22D-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERWE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-VERWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-VERWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-ABART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-ABART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST3
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST4
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST4.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST5
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST5
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST5.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST6
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN22D-TALST6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN22D-TALST6.
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_TN22D_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
VERWE TYPE STRING,
ABART TYPE STRING,
ENDDT TYPE STRING,
BEGDT TYPE STRING,
MAHN TYPE STRING,
TARIF TYPE STRING,
TALST1 TYPE STRING,
TALST2 TYPE STRING,
TALST3 TYPE STRING,
TALST4 TYPE STRING,
TALST5 TYPE STRING,
TALST6 TYPE STRING,
CANC_COP_INV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN22D_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_TN22D_STR-MANDT sy-vline 
WA_TN22D_STR-EINRI sy-vline 
WA_TN22D_STR-VERWE sy-vline 
WA_TN22D_STR-ABART sy-vline 
WA_TN22D_STR-ENDDT sy-vline 
WA_TN22D_STR-BEGDT sy-vline 
WA_TN22D_STR-MAHN sy-vline 
WA_TN22D_STR-TARIF sy-vline 
WA_TN22D_STR-TALST1 sy-vline 
WA_TN22D_STR-TALST2 sy-vline 
WA_TN22D_STR-TALST3 sy-vline 
WA_TN22D_STR-TALST4 sy-vline 
WA_TN22D_STR-TALST5 sy-vline 
WA_TN22D_STR-TALST6 sy-vline 
WA_TN22D_STR-CANC_COP_INV sy-vline      INTO ld_text SEPARATED BY SPACE.

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