ABAP Select data from SAP table INSTCNTL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INSTCNTL
*  INTO TABLE @DATA(IT_INSTCNTL2).
*--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_INSTCNTL INDEX 1 INTO DATA(WA_INSTCNTL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INSTCNTL>-REL = 1.
<INSTCNTL>-SEQNR = 1.
<INSTCNTL>-INSTPROG = 1.
<INSTCNTL>-CHECKFUNC = 1.
<INSTCNTL>-INSTAUTH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INSTCNTL-INSTREPEAT, sy-vline,
  WA_INSTCNTL-INSTRESTRT, sy-vline,
  WA_INSTCNTL-INSTTYPE, sy-vline,
  WA_INSTCNTL-UPGRALLOW, sy-vline,
  WA_INSTCNTL-INSTSTATUS, sy-vline,
  WA_INSTCNTL-INSTPRED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INSTCNTL 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_INSTCNTL 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_INSTCNTL INTO WA_INSTCNTL.


*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_INSTCNTL_STR, 
REL TYPE STRING,
SEQNR TYPE STRING,
INSTPROG TYPE STRING,
CHECKFUNC TYPE STRING,
INSTAUTH TYPE STRING,
INSTREPEAT TYPE STRING,
INSTRESTRT TYPE STRING,
INSTTYPE TYPE STRING,
UPGRALLOW TYPE STRING,
INSTSTATUS TYPE STRING,
INSTPRED TYPE STRING,
COMPONENT TYPE STRING,
EXEDATE TYPE STRING,
EXETIME TYPE STRING,
EXEUSER TYPE STRING,
SAP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INSTCNTL_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_INSTCNTL_STR-REL sy-vline 
WA_INSTCNTL_STR-SEQNR sy-vline 
WA_INSTCNTL_STR-INSTPROG sy-vline 
WA_INSTCNTL_STR-CHECKFUNC sy-vline 
WA_INSTCNTL_STR-INSTAUTH sy-vline 
WA_INSTCNTL_STR-INSTREPEAT sy-vline 
WA_INSTCNTL_STR-INSTRESTRT sy-vline 
WA_INSTCNTL_STR-INSTTYPE sy-vline 
WA_INSTCNTL_STR-UPGRALLOW sy-vline 
WA_INSTCNTL_STR-INSTSTATUS sy-vline 
WA_INSTCNTL_STR-INSTPRED sy-vline 
WA_INSTCNTL_STR-COMPONENT sy-vline 
WA_INSTCNTL_STR-EXEDATE sy-vline 
WA_INSTCNTL_STR-EXETIME sy-vline 
WA_INSTCNTL_STR-EXEUSER sy-vline 
WA_INSTCNTL_STR-SAP sy-vline      INTO ld_text SEPARATED BY SPACE.

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