ABAP Select data from SAP table INSLAC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM INSLAC
*  INTO TABLE @DATA(IT_INSLAC2).
*--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_INSLAC INDEX 1 INTO DATA(WA_INSLAC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<INSLAC>-LCC01 = 1.
<INSLAC>-LCT01 = 1.
<INSLAC>-LPR01 = 1.
<INSLAC>-LCN01 = 1.
<INSLAC>-LRM01 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_INSLAC-LNF01, sy-vline,
  WA_INSLAC-LCC02, sy-vline,
  WA_INSLAC-LCT02, sy-vline,
  WA_INSLAC-LPR02, sy-vline,
  WA_INSLAC-LCN02, sy-vline,
  WA_INSLAC-LRM02, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_INSLAC 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_INSLAC 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_INSLAC INTO WA_INSLAC.


*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_INSLAC_STR, 
LCC01 TYPE STRING,
LCT01 TYPE STRING,
LPR01 TYPE STRING,
LCN01 TYPE STRING,
LRM01 TYPE STRING,
LNF01 TYPE STRING,
LCC02 TYPE STRING,
LCT02 TYPE STRING,
LPR02 TYPE STRING,
LCN02 TYPE STRING,
LRM02 TYPE STRING,
LNF02 TYPE STRING,
LCC03 TYPE STRING,
LCT03 TYPE STRING,
LPR03 TYPE STRING,
LCN03 TYPE STRING,
LRM03 TYPE STRING,
LNF03 TYPE STRING,
LCC04 TYPE STRING,
LCT04 TYPE STRING,
LPR04 TYPE STRING,
LCN04 TYPE STRING,
LRM04 TYPE STRING,
LNF04 TYPE STRING,
LCC05 TYPE STRING,
LCT05 TYPE STRING,
LPR05 TYPE STRING,
LCN05 TYPE STRING,
LRM05 TYPE STRING,
LNF05 TYPE STRING,
LAF01 TYPE STRING,
LAF02 TYPE STRING,
LAF03 TYPE STRING,
LAF04 TYPE STRING,
LAF05 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_INSLAC_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_INSLAC_STR-LCC01 sy-vline 
WA_INSLAC_STR-LCT01 sy-vline 
WA_INSLAC_STR-LPR01 sy-vline 
WA_INSLAC_STR-LCN01 sy-vline 
WA_INSLAC_STR-LRM01 sy-vline 
WA_INSLAC_STR-LNF01 sy-vline 
WA_INSLAC_STR-LCC02 sy-vline 
WA_INSLAC_STR-LCT02 sy-vline 
WA_INSLAC_STR-LPR02 sy-vline 
WA_INSLAC_STR-LCN02 sy-vline 
WA_INSLAC_STR-LRM02 sy-vline 
WA_INSLAC_STR-LNF02 sy-vline 
WA_INSLAC_STR-LCC03 sy-vline 
WA_INSLAC_STR-LCT03 sy-vline 
WA_INSLAC_STR-LPR03 sy-vline 
WA_INSLAC_STR-LCN03 sy-vline 
WA_INSLAC_STR-LRM03 sy-vline 
WA_INSLAC_STR-LNF03 sy-vline 
WA_INSLAC_STR-LCC04 sy-vline 
WA_INSLAC_STR-LCT04 sy-vline 
WA_INSLAC_STR-LPR04 sy-vline 
WA_INSLAC_STR-LCN04 sy-vline 
WA_INSLAC_STR-LRM04 sy-vline 
WA_INSLAC_STR-LNF04 sy-vline 
WA_INSLAC_STR-LCC05 sy-vline 
WA_INSLAC_STR-LCT05 sy-vline 
WA_INSLAC_STR-LPR05 sy-vline 
WA_INSLAC_STR-LCN05 sy-vline 
WA_INSLAC_STR-LRM05 sy-vline 
WA_INSLAC_STR-LNF05 sy-vline 
WA_INSLAC_STR-LAF01 sy-vline 
WA_INSLAC_STR-LAF02 sy-vline 
WA_INSLAC_STR-LAF03 sy-vline 
WA_INSLAC_STR-LAF04 sy-vline 
WA_INSLAC_STR-LAF05 sy-vline      INTO ld_text SEPARATED BY SPACE.

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