ABAP Select data from SAP table MCWBIT into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWBIT
*  INTO TABLE @DATA(IT_MCWBIT2).
*--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_MCWBIT INDEX 1 INTO DATA(WA_MCWBIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWBIT>-SUPKZ = 1.
<MCWBIT>-MANDT = 1.
<MCWBIT>-RUUID = 1.
<MCWBIT>-DOC_TYPE = 1.
<MCWBIT>-DOC_NR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWBIT-DOC_YEAR, sy-vline,
  WA_MCWBIT-DOC_BUKRS, sy-vline,
  WA_MCWBIT-ITEM, sy-vline,
  WA_MCWBIT-SUB_ITEM, sy-vline,
  WA_MCWBIT-TEW_TYPE, sy-vline,
  WA_MCWBIT-BUS_STEP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWBIT 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_MCWBIT 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_MCWBIT INTO WA_MCWBIT.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field PRED_DOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCWBIT-PRED_DOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWBIT-PRED_DOCUMENT.
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_MCWBIT_STR, 
SUPKZ TYPE STRING,
MANDT TYPE STRING,
RUUID TYPE STRING,
DOC_TYPE TYPE STRING,
DOC_NR TYPE STRING,
DOC_YEAR TYPE STRING,
DOC_BUKRS TYPE STRING,
ITEM TYPE STRING,
SUB_ITEM TYPE STRING,
TEW_TYPE TYPE STRING,
BUS_STEP TYPE STRING,
OPEN_QUAN_FLAG TYPE STRING,
TKONN TYPE STRING,
TPOSN TYPE STRING,
TPOSN_SUB TYPE STRING,
PORTFOLIO TYPE STRING,
UNIT_OF_QUAN TYPE STRING,
BASE_SIDE TYPE STRING,
SIDE TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
OWN_QUAN TYPE STRING,
UNIT_DOC TYPE STRING,
PROGRESSED_QUAN TYPE STRING,
ACT_ASSO_QUAN TYPE STRING,
COMPLETED_QUAN TYPE STRING,
POS_QUAN_FLAG TYPE STRING,
PRED_DOC_TYPE TYPE STRING,
PRED_DOC_NR TYPE STRING,
PRED_DOC_YEAR TYPE STRING,
PRED_DOC_BUKRS TYPE STRING,
PRED_ITEM TYPE STRING,
PRED_SUB_ITEM TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
CHARG TYPE STRING,
COMPLETE TYPE STRING,
SEND_COMPL TYPE STRING,
DEL_FLAG TYPE STRING,
TKONN_EX TYPE STRING,
SCENARIO TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
UMZ TYPE STRING,
UMN TYPE STRING,
CORRECTED_QUAN TYPE STRING,
_DATAAGING TYPE STRING,
DUMMY_WBIT_INCL_EEW_PS TYPE STRING,
UPDKZ TYPE STRING,
UPDBIT TYPE STRING,
OWNQUAN_AU TYPE STRING,
DOCUMENT TYPE STRING,
PRED_DOCUMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWBIT_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_MCWBIT_STR-SUPKZ sy-vline 
WA_MCWBIT_STR-MANDT sy-vline 
WA_MCWBIT_STR-RUUID sy-vline 
WA_MCWBIT_STR-DOC_TYPE sy-vline 
WA_MCWBIT_STR-DOC_NR sy-vline 
WA_MCWBIT_STR-DOC_YEAR sy-vline 
WA_MCWBIT_STR-DOC_BUKRS sy-vline 
WA_MCWBIT_STR-ITEM sy-vline 
WA_MCWBIT_STR-SUB_ITEM sy-vline 
WA_MCWBIT_STR-TEW_TYPE sy-vline 
WA_MCWBIT_STR-BUS_STEP sy-vline 
WA_MCWBIT_STR-OPEN_QUAN_FLAG sy-vline 
WA_MCWBIT_STR-TKONN sy-vline 
WA_MCWBIT_STR-TPOSN sy-vline 
WA_MCWBIT_STR-TPOSN_SUB sy-vline 
WA_MCWBIT_STR-PORTFOLIO sy-vline 
WA_MCWBIT_STR-UNIT_OF_QUAN sy-vline 
WA_MCWBIT_STR-BASE_SIDE sy-vline 
WA_MCWBIT_STR-SIDE sy-vline 
WA_MCWBIT_STR-MATNR sy-vline 
WA_MCWBIT_STR-MATKL sy-vline 
WA_MCWBIT_STR-OWN_QUAN sy-vline 
WA_MCWBIT_STR-UNIT_DOC sy-vline 
WA_MCWBIT_STR-PROGRESSED_QUAN sy-vline 
WA_MCWBIT_STR-ACT_ASSO_QUAN sy-vline 
WA_MCWBIT_STR-COMPLETED_QUAN sy-vline 
WA_MCWBIT_STR-POS_QUAN_FLAG sy-vline 
WA_MCWBIT_STR-PRED_DOC_TYPE sy-vline 
WA_MCWBIT_STR-PRED_DOC_NR sy-vline 
WA_MCWBIT_STR-PRED_DOC_YEAR sy-vline 
WA_MCWBIT_STR-PRED_DOC_BUKRS sy-vline 
WA_MCWBIT_STR-PRED_ITEM sy-vline 
WA_MCWBIT_STR-PRED_SUB_ITEM sy-vline 
WA_MCWBIT_STR-WERKS sy-vline 
WA_MCWBIT_STR-LGORT sy-vline 
WA_MCWBIT_STR-CHARG sy-vline 
WA_MCWBIT_STR-COMPLETE sy-vline 
WA_MCWBIT_STR-SEND_COMPL sy-vline 
WA_MCWBIT_STR-DEL_FLAG sy-vline 
WA_MCWBIT_STR-TKONN_EX sy-vline 
WA_MCWBIT_STR-SCENARIO sy-vline 
WA_MCWBIT_STR-ERDAT sy-vline 
WA_MCWBIT_STR-ERZET sy-vline 
WA_MCWBIT_STR-UMZ sy-vline 
WA_MCWBIT_STR-UMN sy-vline 
WA_MCWBIT_STR-CORRECTED_QUAN sy-vline 
WA_MCWBIT_STR-_DATAAGING sy-vline 
WA_MCWBIT_STR-DUMMY_WBIT_INCL_EEW_PS sy-vline 
WA_MCWBIT_STR-UPDKZ sy-vline 
WA_MCWBIT_STR-UPDBIT sy-vline 
WA_MCWBIT_STR-OWNQUAN_AU sy-vline 
WA_MCWBIT_STR-DOCUMENT sy-vline 
WA_MCWBIT_STR-PRED_DOCUMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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