ABAP Select data from SAP table SLEI_LNKG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SLEI_LNKG
*  INTO TABLE @DATA(IT_SLEI_LNKG2).
*--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_SLEI_LNKG INDEX 1 INTO DATA(WA_SLEI_LNKG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SLEI_LNKG>-LNKG_ID = 1.
<SLEI_LNKG>-EVENT_OBJ_CATEG = 1.
<SLEI_LNKG>-EVENT_OBJ_NAME = 1.
<SLEI_LNKG>-EVENT_NAME = 1.
<SLEI_LNKG>-PROXY_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SLEI_LNKG-PROXY_OPER, sy-vline,
  WA_SLEI_LNKG-IS_GENERATED, sy-vline,
  WA_SLEI_LNKG-HAS_CONDITION, sy-vline,
  WA_SLEI_LNKG-USE_MAP_CORR, sy-vline,
  WA_SLEI_LNKG-CREATED_SYSTEM, sy-vline,
  WA_SLEI_LNKG-CREATED_RELEASE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SLEI_LNKG 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_SLEI_LNKG 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_SLEI_LNKG INTO WA_SLEI_LNKG.


*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_SLEI_LNKG_STR, 
LNKG_ID TYPE STRING,
EVENT_OBJ_CATEG TYPE STRING,
EVENT_OBJ_NAME TYPE STRING,
EVENT_NAME TYPE STRING,
PROXY_NAME TYPE STRING,
PROXY_OPER TYPE STRING,
IS_GENERATED TYPE STRING,
HAS_CONDITION TYPE STRING,
USE_MAP_CORR TYPE STRING,
CREATED_SYSTEM TYPE STRING,
CREATED_RELEASE TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_TIME TYPE STRING,
CHANGED_SYSTEM TYPE STRING,
CHANGED_RELEASE TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SLEI_LNKG_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_SLEI_LNKG_STR-LNKG_ID sy-vline 
WA_SLEI_LNKG_STR-EVENT_OBJ_CATEG sy-vline 
WA_SLEI_LNKG_STR-EVENT_OBJ_NAME sy-vline 
WA_SLEI_LNKG_STR-EVENT_NAME sy-vline 
WA_SLEI_LNKG_STR-PROXY_NAME sy-vline 
WA_SLEI_LNKG_STR-PROXY_OPER sy-vline 
WA_SLEI_LNKG_STR-IS_GENERATED sy-vline 
WA_SLEI_LNKG_STR-HAS_CONDITION sy-vline 
WA_SLEI_LNKG_STR-USE_MAP_CORR sy-vline 
WA_SLEI_LNKG_STR-CREATED_SYSTEM sy-vline 
WA_SLEI_LNKG_STR-CREATED_RELEASE sy-vline 
WA_SLEI_LNKG_STR-CREATED_BY sy-vline 
WA_SLEI_LNKG_STR-CREATED_TIME sy-vline 
WA_SLEI_LNKG_STR-CHANGED_SYSTEM sy-vline 
WA_SLEI_LNKG_STR-CHANGED_RELEASE sy-vline 
WA_SLEI_LNKG_STR-CHANGED_BY sy-vline 
WA_SLEI_LNKG_STR-CHANGED_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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