ABAP Select data from SAP table LXDCK_DECRN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LXDCK_DECRN
*  INTO TABLE @DATA(IT_LXDCK_DECRN2).
*--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_LXDCK_DECRN INDEX 1 INTO DATA(WA_LXDCK_DECRN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LXDCK_DECRN>-MANDT = 1.
<LXDCK_DECRN>-LGNUM = 1.
<LXDCK_DECRN>-DCNUM = 1.
<LXDCK_DECRN>-DCTYP = 1.
<LXDCK_DECRN>-OBTYPINB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LXDCK_DECRN-OBNUMINB, sy-vline,
  WA_LXDCK_DECRN-OBPOSINB, sy-vline,
  WA_LXDCK_DECRN-OBTYPOUT, sy-vline,
  WA_LXDCK_DECRN-OBNUMOUT, sy-vline,
  WA_LXDCK_DECRN-OBPOSOUT, sy-vline,
  WA_LXDCK_DECRN-DCSTS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LXDCK_DECRN 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_LXDCK_DECRN 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_LXDCK_DECRN INTO WA_LXDCK_DECRN.


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

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

*Conversion exit CUNIT, internal->external for field DCUOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LXDCK_DECRN-DCUOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXDCK_DECRN-DCUOM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LXDCK_DECRN-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXDCK_DECRN-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TSHME, internal->external for field CRETS
CALL FUNCTION 'CONVERSION_EXIT_TSHME_OUTPUT'
  EXPORTING
    input =                      WA_LXDCK_DECRN-CRETS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXDCK_DECRN-CRETS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSHME, internal->external for field UPDTS
CALL FUNCTION 'CONVERSION_EXIT_TSHME_OUTPUT'
  EXPORTING
    input =                      WA_LXDCK_DECRN-UPDTS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXDCK_DECRN-UPDTS.
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_LXDCK_DECRN_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
DCNUM TYPE STRING,
DCTYP TYPE STRING,
OBTYPINB TYPE STRING,
OBNUMINB TYPE STRING,
OBPOSINB TYPE STRING,
OBTYPOUT TYPE STRING,
OBNUMOUT TYPE STRING,
OBPOSOUT TYPE STRING,
DCSTS TYPE STRING,
DCQTY TYPE STRING,
IPQTY TYPE STRING,
ICQTY TYPE STRING,
OPQTY TYPE STRING,
DCUOM TYPE STRING,
DCORG TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
CHARG TYPE STRING,
BESTQ TYPE STRING,
CREUN TYPE STRING,
CRETS TYPE STRING,
UPDUN TYPE STRING,
UPDTS TYPE STRING,
OTMOV TYPE STRING,
DMODE TYPE STRING,
ZRSTG TYPE STRING,
TANUM TYPE STRING,
TAPOS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LXDCK_DECRN_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_LXDCK_DECRN_STR-MANDT sy-vline 
WA_LXDCK_DECRN_STR-LGNUM sy-vline 
WA_LXDCK_DECRN_STR-DCNUM sy-vline 
WA_LXDCK_DECRN_STR-DCTYP sy-vline 
WA_LXDCK_DECRN_STR-OBTYPINB sy-vline 
WA_LXDCK_DECRN_STR-OBNUMINB sy-vline 
WA_LXDCK_DECRN_STR-OBPOSINB sy-vline 
WA_LXDCK_DECRN_STR-OBTYPOUT sy-vline 
WA_LXDCK_DECRN_STR-OBNUMOUT sy-vline 
WA_LXDCK_DECRN_STR-OBPOSOUT sy-vline 
WA_LXDCK_DECRN_STR-DCSTS sy-vline 
WA_LXDCK_DECRN_STR-DCQTY sy-vline 
WA_LXDCK_DECRN_STR-IPQTY sy-vline 
WA_LXDCK_DECRN_STR-ICQTY sy-vline 
WA_LXDCK_DECRN_STR-OPQTY sy-vline 
WA_LXDCK_DECRN_STR-DCUOM sy-vline 
WA_LXDCK_DECRN_STR-DCORG sy-vline 
WA_LXDCK_DECRN_STR-MATNR sy-vline 
WA_LXDCK_DECRN_STR-WERKS sy-vline 
WA_LXDCK_DECRN_STR-LGORT sy-vline 
WA_LXDCK_DECRN_STR-SOBKZ sy-vline 
WA_LXDCK_DECRN_STR-SONUM sy-vline 
WA_LXDCK_DECRN_STR-CHARG sy-vline 
WA_LXDCK_DECRN_STR-BESTQ sy-vline 
WA_LXDCK_DECRN_STR-CREUN sy-vline 
WA_LXDCK_DECRN_STR-CRETS sy-vline 
WA_LXDCK_DECRN_STR-UPDUN sy-vline 
WA_LXDCK_DECRN_STR-UPDTS sy-vline 
WA_LXDCK_DECRN_STR-OTMOV sy-vline 
WA_LXDCK_DECRN_STR-DMODE sy-vline 
WA_LXDCK_DECRN_STR-ZRSTG sy-vline 
WA_LXDCK_DECRN_STR-TANUM sy-vline 
WA_LXDCK_DECRN_STR-TAPOS sy-vline      INTO ld_text SEPARATED BY SPACE.

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