ABAP Select data from SAP table E2LTCAX into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E2LTCAX 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 E2LTCAX. 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 E2LTCAX 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_E2LTCAX TYPE STANDARD TABLE OF E2LTCAX,
      WA_E2LTCAX TYPE E2LTCAX,
      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: <E2LTCAX> TYPE E2LTCAX.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E2LTCAX.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E2LTCAX
  INTO TABLE IT_E2LTCAX.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E2LTCAX
*  INTO TABLE @DATA(IT_E2LTCAX2).
*--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_E2LTCAX INDEX 1 INTO DATA(WA_E2LTCAX2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E2LTCAX ASSIGNING <E2LTCAX>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E2LTCAX>-LGNUM = 1.
<E2LTCAX>-LENUM = 1.
<E2LTCAX>-TANUM = 1.
<E2LTCAX>-SOPOS = 1.
<E2LTCAX>-TAPOS = 1.

ENDLOOP.

LOOP AT IT_E2LTCAX INTO WA_E2LTCAX.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E2LTCAX-CANCL, sy-vline,
  WA_E2LTCAX-CANRQ, sy-vline,
  WA_E2LTCAX-KZFOL, sy-vline,
  WA_E2LTCAX-STOGR, sy-vline,
  WA_E2LTCAX-SFTXT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_E2LTCAX 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_E2LTCAX 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_E2LTCAX INTO WA_E2LTCAX.


*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 LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_E2LTCAX-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_E2LTCAX-LENUM.
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_E2LTCAX_STR, 
LGNUM TYPE STRING,
LENUM TYPE STRING,
TANUM TYPE STRING,
SOPOS TYPE STRING,
TAPOS TYPE STRING,
CANCL TYPE STRING,
CANRQ TYPE STRING,
KZFOL TYPE STRING,
STOGR TYPE STRING,
SFTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E2LTCAX_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_E2LTCAX_STR-LGNUM sy-vline 
WA_E2LTCAX_STR-LENUM sy-vline 
WA_E2LTCAX_STR-TANUM sy-vline 
WA_E2LTCAX_STR-SOPOS sy-vline 
WA_E2LTCAX_STR-TAPOS sy-vline 
WA_E2LTCAX_STR-CANCL sy-vline 
WA_E2LTCAX_STR-CANRQ sy-vline 
WA_E2LTCAX_STR-KZFOL sy-vline 
WA_E2LTCAX_STR-STOGR sy-vline 
WA_E2LTCAX_STR-SFTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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