ABAP Select data from SAP table ICLNOLAU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICLNOLAU
*  INTO TABLE @DATA(IT_ICLNOLAU2).
*--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_ICLNOLAU INDEX 1 INTO DATA(WA_ICLNOLAU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICLNOLAU>-CLIENT = 1.
<ICLNOLAU>-NOTICE = 1.
<ICLNOLAU>-CREATEDBY = 1.
<ICLNOLAU>-CREATETIME = 1.
<ICLNOLAU>-CHANGEDBY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICLNOLAU-CHANGETIME, sy-vline,
  WA_ICLNOLAU-VIEWFAULT, sy-vline,
  WA_ICLNOLAU-FAULTRATEPH, sy-vline,
  WA_ICLNOLAU-FAULTRATECL, sy-vline,
  WA_ICLNOLAU-POLICYCL, sy-vline,
  WA_ICLNOLAU-INSCOCL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICLNOLAU 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_ICLNOLAU 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_ICLNOLAU INTO WA_ICLNOLAU.


*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.

*Conversion exit ALPHA, internal->external for field NOTICE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICLNOLAU-NOTICE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLNOLAU-NOTICE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTAM, internal->external for field CREATETIME
CALL FUNCTION 'CONVERSION_EXIT_TSTAM_OUTPUT'
  EXPORTING
    input =                      WA_ICLNOLAU-CREATETIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLNOLAU-CREATETIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTAM, internal->external for field CHANGETIME
CALL FUNCTION 'CONVERSION_EXIT_TSTAM_OUTPUT'
  EXPORTING
    input =                      WA_ICLNOLAU-CHANGETIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLNOLAU-CHANGETIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field POLICYCL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICLNOLAU-POLICYCL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLNOLAU-POLICYCL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INSCOCL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICLNOLAU-INSCOCL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLNOLAU-INSCOCL.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_ICLNOLAU_STR, 
CLIENT TYPE STRING,
NOTICE TYPE STRING,
CREATEDBY TYPE STRING,
CREATETIME TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGETIME TYPE STRING,
VIEWFAULT TYPE STRING,
FAULTRATEPH TYPE STRING,
FAULTRATECL TYPE STRING,
POLICYCL TYPE STRING,
INSCOCL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICLNOLAU_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_ICLNOLAU_STR-CLIENT sy-vline 
WA_ICLNOLAU_STR-NOTICE sy-vline 
WA_ICLNOLAU_STR-CREATEDBY sy-vline 
WA_ICLNOLAU_STR-CREATETIME sy-vline 
WA_ICLNOLAU_STR-CHANGEDBY sy-vline 
WA_ICLNOLAU_STR-CHANGETIME sy-vline 
WA_ICLNOLAU_STR-VIEWFAULT sy-vline 
WA_ICLNOLAU_STR-FAULTRATEPH sy-vline 
WA_ICLNOLAU_STR-FAULTRATECL sy-vline 
WA_ICLNOLAU_STR-POLICYCL sy-vline 
WA_ICLNOLAU_STR-INSCOCL sy-vline      INTO ld_text SEPARATED BY SPACE.

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