ABAP Select data from SAP table DIACL_LGE_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIACL_LGE_S
*  INTO TABLE @DATA(IT_DIACL_LGE_S2).
*--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_DIACL_LGE_S INDEX 1 INTO DATA(WA_DIACL_LGE_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIACL_LGE_S>-STXT = 1.
<DIACL_LGE_S>-COCE = 1.
<DIACL_LGE_S>-MDOCM_OPTIME = 1.
<DIACL_LGE_S>-MDOCM_CYCLES = 1.
<DIACL_LGE_S>-STARTTM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIACL_LGE_S-ENDTM, sy-vline,
  WA_DIACL_LGE_S-STARTDT, sy-vline,
  WA_DIACL_LGE_S-ENDDT, sy-vline,
  WA_DIACL_LGE_S-STARTTZ, sy-vline,
  WA_DIACL_LGE_S-ENDTZ, sy-vline,
  WA_DIACL_LGE_S-CYCLES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIACL_LGE_S 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_DIACL_LGE_S 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_DIACL_LGE_S INTO WA_DIACL_LGE_S.


*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 MDOCM_OPTIME
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_LGE_S-MDOCM_OPTIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_LGE_S-MDOCM_OPTIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MDOCM_CYCLES
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DIACL_LGE_S-MDOCM_CYCLES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIACL_LGE_S-MDOCM_CYCLES.
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_DIACL_LGE_S_STR, 
STXT TYPE STRING,
COCE TYPE STRING,
MDOCM_OPTIME TYPE STRING,
MDOCM_CYCLES TYPE STRING,
STARTTM TYPE STRING,
ENDTM TYPE STRING,
STARTDT TYPE STRING,
ENDDT TYPE STRING,
STARTTZ TYPE STRING,
ENDTZ TYPE STRING,
CYCLES TYPE STRING,
LETYP TYPE STRING,
OBJNR TYPE STRING,
ORIGIN TYPE STRING,
DESTINATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIACL_LGE_S_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_DIACL_LGE_S_STR-STXT sy-vline 
WA_DIACL_LGE_S_STR-COCE sy-vline 
WA_DIACL_LGE_S_STR-MDOCM_OPTIME sy-vline 
WA_DIACL_LGE_S_STR-MDOCM_CYCLES sy-vline 
WA_DIACL_LGE_S_STR-STARTTM sy-vline 
WA_DIACL_LGE_S_STR-ENDTM sy-vline 
WA_DIACL_LGE_S_STR-STARTDT sy-vline 
WA_DIACL_LGE_S_STR-ENDDT sy-vline 
WA_DIACL_LGE_S_STR-STARTTZ sy-vline 
WA_DIACL_LGE_S_STR-ENDTZ sy-vline 
WA_DIACL_LGE_S_STR-CYCLES sy-vline 
WA_DIACL_LGE_S_STR-LETYP sy-vline 
WA_DIACL_LGE_S_STR-OBJNR sy-vline 
WA_DIACL_LGE_S_STR-ORIGIN sy-vline 
WA_DIACL_LGE_S_STR-DESTINATION sy-vline      INTO ld_text SEPARATED BY SPACE.

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