ABAP Select data from SAP table MCLIAPB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCLIAPB
*  INTO TABLE @DATA(IT_MCLIAPB2).
*--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_MCLIAPB INDEX 1 INTO DATA(WA_MCLIAPB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCLIAPB>-SUPKZ = 1.
<MCLIAPB>-MANDT = 1.
<MCLIAPB>-VBELN = 1.
<MCLIAPB>-POSNR = 1.
<MCLIAPB>-PSTYV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCLIAPB-MATNR, sy-vline,
  WA_MCLIAPB-MATKL, sy-vline,
  WA_MCLIAPB-WERKS, sy-vline,
  WA_MCLIAPB-LGORT, sy-vline,
  WA_MCLIAPB-KDMAT, sy-vline,
  WA_MCLIAPB-LFIMG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCLIAPB 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_MCLIAPB 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_MCLIAPB INTO WA_MCLIAPB.


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

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

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

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

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

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

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

*Conversion exit EAN11, internal->external for field EAN11
CALL FUNCTION 'CONVERSION_EXIT_EAN11_OUTPUT'
  EXPORTING
    input =                      WA_MCLIAPB-EAN11
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCLIAPB-EAN11.
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_MCLIAPB_STR, 
SUPKZ TYPE STRING,
MANDT TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
PSTYV TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
KDMAT TYPE STRING,
LFIMG TYPE STRING,
MEINS TYPE STRING,
VRKME TYPE STRING,
UMVKZ TYPE STRING,
UMVKN TYPE STRING,
NTGEW TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
LGMNG TYPE STRING,
VGBEL TYPE STRING,
VGPOS TYPE STRING,
LGNUM TYPE STRING,
MTART TYPE STRING,
EAN11 TYPE STRING,
VGTYP TYPE STRING,
PCKPF TYPE STRING,
MFRGR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCLIAPB_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_MCLIAPB_STR-SUPKZ sy-vline 
WA_MCLIAPB_STR-MANDT sy-vline 
WA_MCLIAPB_STR-VBELN sy-vline 
WA_MCLIAPB_STR-POSNR sy-vline 
WA_MCLIAPB_STR-PSTYV sy-vline 
WA_MCLIAPB_STR-MATNR sy-vline 
WA_MCLIAPB_STR-MATKL sy-vline 
WA_MCLIAPB_STR-WERKS sy-vline 
WA_MCLIAPB_STR-LGORT sy-vline 
WA_MCLIAPB_STR-KDMAT sy-vline 
WA_MCLIAPB_STR-LFIMG sy-vline 
WA_MCLIAPB_STR-MEINS sy-vline 
WA_MCLIAPB_STR-VRKME sy-vline 
WA_MCLIAPB_STR-UMVKZ sy-vline 
WA_MCLIAPB_STR-UMVKN sy-vline 
WA_MCLIAPB_STR-NTGEW sy-vline 
WA_MCLIAPB_STR-BRGEW sy-vline 
WA_MCLIAPB_STR-GEWEI sy-vline 
WA_MCLIAPB_STR-VOLUM sy-vline 
WA_MCLIAPB_STR-VOLEH sy-vline 
WA_MCLIAPB_STR-LGMNG sy-vline 
WA_MCLIAPB_STR-VGBEL sy-vline 
WA_MCLIAPB_STR-VGPOS sy-vline 
WA_MCLIAPB_STR-LGNUM sy-vline 
WA_MCLIAPB_STR-MTART sy-vline 
WA_MCLIAPB_STR-EAN11 sy-vline 
WA_MCLIAPB_STR-VGTYP sy-vline 
WA_MCLIAPB_STR-PCKPF sy-vline 
WA_MCLIAPB_STR-MFRGR sy-vline      INTO ld_text SEPARATED BY SPACE.

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