ABAP Select data from SAP table TYPEINTERV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TYPEINTERV
*  INTO TABLE @DATA(IT_TYPEINTERV2).
*--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_TYPEINTERV INDEX 1 INTO DATA(WA_TYPEINTERV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TYPEINTERV>-EANTYP = 1.
<TYPEINTERV>-OBJ = 1.
<TYPEINTERV>-NMKRE = 1.
<TYPEINTERV>-NMKRS = 1.
<TYPEINTERV>-NRFROM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TYPEINTERV-NRTO, sy-vline,
  WA_TYPEINTERV-NRLEVEL, sy-vline,
  WA_TYPEINTERV-EXTERN, sy-vline,
  WA_TYPEINTERV-PRFZA, sy-vline,
  WA_TYPEINTERV-PGEAN, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TYPEINTERV 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_TYPEINTERV 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_TYPEINTERV INTO WA_TYPEINTERV.


*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_TYPEINTERV_STR, 
EANTYP TYPE STRING,
OBJ TYPE STRING,
NMKRE TYPE STRING,
NMKRS TYPE STRING,
NRFROM TYPE STRING,
NRTO TYPE STRING,
NRLEVEL TYPE STRING,
EXTERN TYPE STRING,
PRFZA TYPE STRING,
PGEAN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TYPEINTERV_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_TYPEINTERV_STR-EANTYP sy-vline 
WA_TYPEINTERV_STR-OBJ sy-vline 
WA_TYPEINTERV_STR-NMKRE sy-vline 
WA_TYPEINTERV_STR-NMKRS sy-vline 
WA_TYPEINTERV_STR-NRFROM sy-vline 
WA_TYPEINTERV_STR-NRTO sy-vline 
WA_TYPEINTERV_STR-NRLEVEL sy-vline 
WA_TYPEINTERV_STR-EXTERN sy-vline 
WA_TYPEINTERV_STR-PRFZA sy-vline 
WA_TYPEINTERV_STR-PGEAN sy-vline      INTO ld_text SEPARATED BY SPACE.

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