ABAP Select data from SAP table LNGTINFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LNGTINFO
*  INTO TABLE @DATA(IT_LNGTINFO2).
*--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_LNGTINFO INDEX 1 INTO DATA(WA_LNGTINFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LNGTINFO>-MANDT = 1.
<LNGTINFO>-TARGETLANG = 1.
<LNGTINFO>-UNAME = 1.
<LNGTINFO>-TRKORR = 1.
<LNGTINFO>-TRSTATUS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LNGTINFO-TARSYSTEM, sy-vline,
  WA_LNGTINFO-KORRDEV, sy-vline,
  WA_LNGTINFO-AS4USER, sy-vline,
  WA_LNGTINFO-AS4DATE, sy-vline,
  WA_LNGTINFO-AS4TIME, sy-vline,
  WA_LNGTINFO-AS4TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LNGTINFO 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_LNGTINFO 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_LNGTINFO INTO WA_LNGTINFO.


*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 ISOLA, internal->external for field TARGETLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_LNGTINFO-TARGETLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LNGTINFO-TARGETLANG.
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_LNGTINFO_STR, 
MANDT TYPE STRING,
TARGETLANG TYPE STRING,
UNAME TYPE STRING,
TRKORR TYPE STRING,
TRSTATUS TYPE STRING,
TARSYSTEM TYPE STRING,
KORRDEV TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
AS4TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LNGTINFO_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_LNGTINFO_STR-MANDT sy-vline 
WA_LNGTINFO_STR-TARGETLANG sy-vline 
WA_LNGTINFO_STR-UNAME sy-vline 
WA_LNGTINFO_STR-TRKORR sy-vline 
WA_LNGTINFO_STR-TRSTATUS sy-vline 
WA_LNGTINFO_STR-TARSYSTEM sy-vline 
WA_LNGTINFO_STR-KORRDEV sy-vline 
WA_LNGTINFO_STR-AS4USER sy-vline 
WA_LNGTINFO_STR-AS4DATE sy-vline 
WA_LNGTINFO_STR-AS4TIME sy-vline 
WA_LNGTINFO_STR-AS4TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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