ABAP Select data from SAP table INSTCMPD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INSTCMPD
*  INTO TABLE @DATA(IT_INSTCMPD2).
*--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_INSTCMPD INDEX 1 INTO DATA(WA_INSTCMPD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INSTCMPD>-MANDT = 1.
<INSTCMPD>-INSTGUID = 1.
<INSTCMPD>-INSTCNT = 1.
<INSTCMPD>-KNOBJ = 1.
<INSTCMPD>-XMIN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INSTCMPD-YMIN, sy-vline,
  WA_INSTCMPD-ZMIN, sy-vline,
  WA_INSTCMPD-XMAX, sy-vline,
  WA_INSTCMPD-YMAX, sy-vline,
  WA_INSTCMPD-ZMAX, sy-vline,
  WA_INSTCMPD-LOCOX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INSTCMPD 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_INSTCMPD 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_INSTCMPD INTO WA_INSTCMPD.


*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_INSTCMPD_STR, 
MANDT TYPE STRING,
INSTGUID TYPE STRING,
INSTCNT TYPE STRING,
KNOBJ TYPE STRING,
XMIN TYPE STRING,
YMIN TYPE STRING,
ZMIN TYPE STRING,
XMAX TYPE STRING,
YMAX TYPE STRING,
ZMAX TYPE STRING,
LOCOX TYPE STRING,
LOCOY TYPE STRING,
LOCOZ TYPE STRING,
AXIS1X TYPE STRING,
AXIS1Y TYPE STRING,
AXIS1Z TYPE STRING,
AXIS2X TYPE STRING,
AXIS2Y TYPE STRING,
AXIS2Z TYPE STRING,
AXIS3X TYPE STRING,
AXIS3Y TYPE STRING,
AXIS3Z TYPE STRING,
SCALE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INSTCMPD_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_INSTCMPD_STR-MANDT sy-vline 
WA_INSTCMPD_STR-INSTGUID sy-vline 
WA_INSTCMPD_STR-INSTCNT sy-vline 
WA_INSTCMPD_STR-KNOBJ sy-vline 
WA_INSTCMPD_STR-XMIN sy-vline 
WA_INSTCMPD_STR-YMIN sy-vline 
WA_INSTCMPD_STR-ZMIN sy-vline 
WA_INSTCMPD_STR-XMAX sy-vline 
WA_INSTCMPD_STR-YMAX sy-vline 
WA_INSTCMPD_STR-ZMAX sy-vline 
WA_INSTCMPD_STR-LOCOX sy-vline 
WA_INSTCMPD_STR-LOCOY sy-vline 
WA_INSTCMPD_STR-LOCOZ sy-vline 
WA_INSTCMPD_STR-AXIS1X sy-vline 
WA_INSTCMPD_STR-AXIS1Y sy-vline 
WA_INSTCMPD_STR-AXIS1Z sy-vline 
WA_INSTCMPD_STR-AXIS2X sy-vline 
WA_INSTCMPD_STR-AXIS2Y sy-vline 
WA_INSTCMPD_STR-AXIS2Z sy-vline 
WA_INSTCMPD_STR-AXIS3X sy-vline 
WA_INSTCMPD_STR-AXIS3Y sy-vline 
WA_INSTCMPD_STR-AXIS3Z sy-vline 
WA_INSTCMPD_STR-SCALE sy-vline      INTO ld_text SEPARATED BY SPACE.

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