ABAP Select data from SAP table ISU2A_TRFKGH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ISU2A_TRFKGH 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 ISU2A_TRFKGH. 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 ISU2A_TRFKGH 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_ISU2A_TRFKGH TYPE STANDARD TABLE OF ISU2A_TRFKGH,
      WA_ISU2A_TRFKGH TYPE ISU2A_TRFKGH,
      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: <ISU2A_TRFKGH> TYPE ISU2A_TRFKGH.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ISU2A_TRFKGH.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ISU2A_TRFKGH
  INTO TABLE IT_ISU2A_TRFKGH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISU2A_TRFKGH
*  INTO TABLE @DATA(IT_ISU2A_TRFKGH2).
*--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_ISU2A_TRFKGH INDEX 1 INTO DATA(WA_ISU2A_TRFKGH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ISU2A_TRFKGH ASSIGNING <ISU2A_TRFKGH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISU2A_TRFKGH>-TARIFNR = 1.
<ISU2A_TRFKGH>-AB = 1.
<ISU2A_TRFKGH>-LFDNR = 1.
<ISU2A_TRFKGH>-LOGIKZW = 1.
<ISU2A_TRFKGH>-OPERAND = 1.

ENDLOOP.

LOOP AT IT_ISU2A_TRFKGH INTO WA_ISU2A_TRFKGH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISU2A_TRFKGH-OPLFDNR, sy-vline,
  WA_ISU2A_TRFKGH-LOGIKNR, sy-vline,
  WA_ISU2A_TRFKGH-PEBRATE, sy-vline,
  WA_ISU2A_TRFKGH-BIS, sy-vline,
  WA_ISU2A_TRFKGH-TARIFART, sy-vline,
  WA_ISU2A_TRFKGH-TARIFTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISU2A_TRFKGH 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_ISU2A_TRFKGH 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_ISU2A_TRFKGH INTO WA_ISU2A_TRFKGH.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ISU2A_TRFKGH_STR, 
TARIFNR TYPE STRING,
AB TYPE STRING,
LFDNR TYPE STRING,
LOGIKZW TYPE STRING,
OPERAND TYPE STRING,
OPLFDNR TYPE STRING,
LOGIKNR TYPE STRING,
PEBRATE TYPE STRING,
BIS TYPE STRING,
TARIFART TYPE STRING,
TARIFTYP TYPE STRING,
NO_ABRZEIT TYPE STRING,
KONDIGR TYPE STRING,
COND_RATE_FLAG TYPE STRING,
ACTIVE_COND_RATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISU2A_TRFKGH_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_ISU2A_TRFKGH_STR-TARIFNR sy-vline 
WA_ISU2A_TRFKGH_STR-AB sy-vline 
WA_ISU2A_TRFKGH_STR-LFDNR sy-vline 
WA_ISU2A_TRFKGH_STR-LOGIKZW sy-vline 
WA_ISU2A_TRFKGH_STR-OPERAND sy-vline 
WA_ISU2A_TRFKGH_STR-OPLFDNR sy-vline 
WA_ISU2A_TRFKGH_STR-LOGIKNR sy-vline 
WA_ISU2A_TRFKGH_STR-PEBRATE sy-vline 
WA_ISU2A_TRFKGH_STR-BIS sy-vline 
WA_ISU2A_TRFKGH_STR-TARIFART sy-vline 
WA_ISU2A_TRFKGH_STR-TARIFTYP sy-vline 
WA_ISU2A_TRFKGH_STR-NO_ABRZEIT sy-vline 
WA_ISU2A_TRFKGH_STR-KONDIGR sy-vline 
WA_ISU2A_TRFKGH_STR-COND_RATE_FLAG sy-vline 
WA_ISU2A_TRFKGH_STR-ACTIVE_COND_RATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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