ABAP Select data from SAP table TXT_HDR_CLASS_DATA_PLAIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXT_HDR_CLASS_DATA_PLAIN
*  INTO TABLE @DATA(IT_TXT_HDR_CLASS_DATA_PLAIN2).
*--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_TXT_HDR_CLASS_DATA_PLAIN INDEX 1 INTO DATA(WA_TXT_HDR_CLASS_DATA_PLAIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXT_HDR_CLASS_DATA_PLAIN>-RECORD_TYPE = 1.
<TXT_HDR_CLASS_DATA_PLAIN>-OBJECT_TYPE = 1.
<TXT_HDR_CLASS_DATA_PLAIN>-AENNR = 1.
<TXT_HDR_CLASS_DATA_PLAIN>-DATUV = 1.
<TXT_HDR_CLASS_DATA_PLAIN>-AENNR_AUS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXT_HDR_CLASS_DATA_PLAIN-DATUB, sy-vline,
  WA_TXT_HDR_CLASS_DATA_PLAIN-LOEKZ, sy-vline,
  WA_TXT_HDR_CLASS_DATA_PLAIN-PLNTY, sy-vline,
  WA_TXT_HDR_CLASS_DATA_PLAIN-PLNNR, sy-vline,
  WA_TXT_HDR_CLASS_DATA_PLAIN-PLNAL, sy-vline,
  WA_TXT_HDR_CLASS_DATA_PLAIN-PLNFL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXT_HDR_CLASS_DATA_PLAIN 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_TXT_HDR_CLASS_DATA_PLAIN 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_TXT_HDR_CLASS_DATA_PLAIN INTO WA_TXT_HDR_CLASS_DATA_PLAIN.


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

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

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

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_TXT_HDR_CLASS_DATA_PLAIN-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXT_HDR_CLASS_DATA_PLAIN-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field UVORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_TXT_HDR_CLASS_DATA_PLAIN-UVORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXT_HDR_CLASS_DATA_PLAIN-UVORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field TXTSP
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TXT_HDR_CLASS_DATA_PLAIN-TXTSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TXT_HDR_CLASS_DATA_PLAIN-TXTSP.
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_TXT_HDR_CLASS_DATA_PLAIN_STR, 
RECORD_TYPE TYPE STRING,
OBJECT_TYPE TYPE STRING,
AENNR TYPE STRING,
DATUV TYPE STRING,
AENNR_AUS TYPE STRING,
DATUB TYPE STRING,
LOEKZ TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNFL TYPE STRING,
VORNR TYPE STRING,
UVORNR TYPE STRING,
OPRID TYPE STRING,
PSNFH TYPE STRING,
PZLFH TYPE STRING,
KZEINSTELL TYPE STRING,
MERKNR TYPE STRING,
CHA_TEXT_TYPE TYPE STRING,
TXTSP TYPE STRING,
LANGU_ISO TYPE STRING,
LINE_FROM TYPE STRING,
LINE_TO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXT_HDR_CLASS_DATA_PLAIN_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_TXT_HDR_CLASS_DATA_PLAIN_STR-RECORD_TYPE sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-OBJECT_TYPE sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-AENNR sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-DATUV sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-AENNR_AUS sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-DATUB sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-LOEKZ sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PLNTY sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PLNNR sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PLNAL sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PLNFL sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-VORNR sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-UVORNR sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-OPRID sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PSNFH sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-PZLFH sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-KZEINSTELL sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-MERKNR sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-CHA_TEXT_TYPE sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-TXTSP sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-LANGU_ISO sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-LINE_FROM sy-vline 
WA_TXT_HDR_CLASS_DATA_PLAIN_STR-LINE_TO sy-vline      INTO ld_text SEPARATED BY SPACE.

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