ABAP Select data from SAP table MCEKBZB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKBZB
*  INTO TABLE @DATA(IT_MCEKBZB2).
*--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_MCEKBZB INDEX 1 INTO DATA(WA_MCEKBZB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKBZB>-SUPKZ = 1.
<MCEKBZB>-MANDT = 1.
<MCEKBZB>-EBELN = 1.
<MCEKBZB>-EBELP = 1.
<MCEKBZB>-STUNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKBZB-ZAEHK, sy-vline,
  WA_MCEKBZB-VGABE, sy-vline,
  WA_MCEKBZB-GJAHR, sy-vline,
  WA_MCEKBZB-BELNR, sy-vline,
  WA_MCEKBZB-BUZEI, sy-vline,
  WA_MCEKBZB-BEWTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKBZB 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_MCEKBZB 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_MCEKBZB INTO WA_MCEKBZB.


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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MCEKBZB-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKBZB-GJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit EXCRT, internal->external for field WKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_MCEKBZB-WKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEKBZB-WKURS.
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_MCEKBZB_STR, 
SUPKZ TYPE STRING,
MANDT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
VGABE TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
BUZEI TYPE STRING,
BEWTP TYPE STRING,
BUDAT TYPE STRING,
MENGE TYPE STRING,
DMBTR TYPE STRING,
WRBTR TYPE STRING,
WAERS TYPE STRING,
AREWR TYPE STRING,
SHKZG TYPE STRING,
XBLNR TYPE STRING,
FRBNR TYPE STRING,
LIFNR TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
REEWR TYPE STRING,
REFWR TYPE STRING,
BWTAR TYPE STRING,
KSCHL TYPE STRING,
BPMNG TYPE STRING,
AREWW TYPE STRING,
HSWAE TYPE STRING,
VNETW TYPE STRING,
ERNAM TYPE STRING,
SHKKO TYPE STRING,
AREWB TYPE STRING,
REWRB TYPE STRING,
SAPRL TYPE STRING,
MENGE_POP TYPE STRING,
DMBTR_POP TYPE STRING,
WRBTR_POP TYPE STRING,
BPMNG_POP TYPE STRING,
AREWR_POP TYPE STRING,
KUDIF TYPE STRING,
XMACC TYPE STRING,
WKURS TYPE STRING,
_DATAAGING TYPE STRING,
/CWM/BAMNG TYPE STRING,
/CWM/WESBS TYPE STRING,
/CWM/TY2TQ TYPE STRING,
DUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKBZB_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_MCEKBZB_STR-SUPKZ sy-vline 
WA_MCEKBZB_STR-MANDT sy-vline 
WA_MCEKBZB_STR-EBELN sy-vline 
WA_MCEKBZB_STR-EBELP sy-vline 
WA_MCEKBZB_STR-STUNR sy-vline 
WA_MCEKBZB_STR-ZAEHK sy-vline 
WA_MCEKBZB_STR-VGABE sy-vline 
WA_MCEKBZB_STR-GJAHR sy-vline 
WA_MCEKBZB_STR-BELNR sy-vline 
WA_MCEKBZB_STR-BUZEI sy-vline 
WA_MCEKBZB_STR-BEWTP sy-vline 
WA_MCEKBZB_STR-BUDAT sy-vline 
WA_MCEKBZB_STR-MENGE sy-vline 
WA_MCEKBZB_STR-DMBTR sy-vline 
WA_MCEKBZB_STR-WRBTR sy-vline 
WA_MCEKBZB_STR-WAERS sy-vline 
WA_MCEKBZB_STR-AREWR sy-vline 
WA_MCEKBZB_STR-SHKZG sy-vline 
WA_MCEKBZB_STR-XBLNR sy-vline 
WA_MCEKBZB_STR-FRBNR sy-vline 
WA_MCEKBZB_STR-LIFNR sy-vline 
WA_MCEKBZB_STR-CPUDT sy-vline 
WA_MCEKBZB_STR-CPUTM sy-vline 
WA_MCEKBZB_STR-REEWR sy-vline 
WA_MCEKBZB_STR-REFWR sy-vline 
WA_MCEKBZB_STR-BWTAR sy-vline 
WA_MCEKBZB_STR-KSCHL sy-vline 
WA_MCEKBZB_STR-BPMNG sy-vline 
WA_MCEKBZB_STR-AREWW sy-vline 
WA_MCEKBZB_STR-HSWAE sy-vline 
WA_MCEKBZB_STR-VNETW sy-vline 
WA_MCEKBZB_STR-ERNAM sy-vline 
WA_MCEKBZB_STR-SHKKO sy-vline 
WA_MCEKBZB_STR-AREWB sy-vline 
WA_MCEKBZB_STR-REWRB sy-vline 
WA_MCEKBZB_STR-SAPRL sy-vline 
WA_MCEKBZB_STR-MENGE_POP sy-vline 
WA_MCEKBZB_STR-DMBTR_POP sy-vline 
WA_MCEKBZB_STR-WRBTR_POP sy-vline 
WA_MCEKBZB_STR-BPMNG_POP sy-vline 
WA_MCEKBZB_STR-AREWR_POP sy-vline 
WA_MCEKBZB_STR-KUDIF sy-vline 
WA_MCEKBZB_STR-XMACC sy-vline 
WA_MCEKBZB_STR-WKURS sy-vline 
WA_MCEKBZB_STR-_DATAAGING sy-vline 
WA_MCEKBZB_STR-/CWM/BAMNG sy-vline 
WA_MCEKBZB_STR-/CWM/WESBS sy-vline 
WA_MCEKBZB_STR-/CWM/TY2TQ sy-vline 
WA_MCEKBZB_STR-DUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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