ABAP Select data from SAP table MCWMHDB into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCWMHDB 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 MCWMHDB. 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 MCWMHDB 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_MCWMHDB TYPE STANDARD TABLE OF MCWMHDB,
      WA_MCWMHDB TYPE MCWMHDB,
      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: <MCWMHDB> TYPE MCWMHDB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCWMHDB
*  INTO TABLE @DATA(IT_MCWMHDB2).
*--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_MCWMHDB INDEX 1 INTO DATA(WA_MCWMHDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCWMHDB>-SUPKZ = 1.
<MCWMHDB>-TB_PDATU = 1.
<MCWMHDB>-TB_PZEIT = 1.
<MCWMHDB>-TB_BDATU = 1.
<MCWMHDB>-TB_BZEIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCWMHDB-TB_UNAME, sy-vline,
  WA_MCWMHDB-TB_STATU, sy-vline,
  WA_MCWMHDB-TB_ANZPS, sy-vline,
  WA_MCWMHDB-TB_BRGEW, sy-vline,
  WA_MCWMHDB-TB_GEWEI, sy-vline,
  WA_MCWMHDB-TB_VLTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCWMHDB 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_MCWMHDB 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_MCWMHDB INTO WA_MCWMHDB.


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

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

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

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field ZEIEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCWMHDB-ZEIEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCWMHDB-ZEIEI.
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_MCWMHDB_STR, 
SUPKZ TYPE STRING,
TB_PDATU TYPE STRING,
TB_PZEIT TYPE STRING,
TB_BDATU TYPE STRING,
TB_BZEIT TYPE STRING,
TB_UNAME TYPE STRING,
TB_STATU TYPE STRING,
TB_ANZPS TYPE STRING,
TB_BRGEW TYPE STRING,
TB_GEWEI TYPE STRING,
TB_VLTYP TYPE STRING,
TB_VLPLA TYPE STRING,
TB_VKDYN TYPE STRING,
TB_NLTYP TYPE STRING,
TB_NLPLA TYPE STRING,
TB_NKDYN TYPE STRING,
VB_VSTEL TYPE STRING,
VB_ROUTE TYPE STRING,
VB_BEROT TYPE STRING,
VB_LPRIO TYPE STRING,
VB_KODAT TYPE STRING,
VB_LDDAT TYPE STRING,
VB_BTGEW TYPE STRING,
VB_GEWEI TYPE STRING,
VB_VOLUM TYPE STRING,
VB_VOLEH TYPE STRING,
VB_KUNNR TYPE STRING,
TAPSC TYPE STRING,
DUMMY TYPE STRING,
CNTPS TYPE STRING,
NIDRU TYPE STRING,
ACTDA TYPE STRING,
TEIL2 TYPE STRING,
TEILD TYPE STRING,
BITEM TYPE STRING,
KOMIM TYPE STRING,
EINLM TYPE STRING,
MANDT TYPE STRING,
LGNUM TYPE STRING,
TANUM TYPE STRING,
BWART TYPE STRING,
BWLVS TYPE STRING,
TBPRI TYPE STRING,
TRART TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BNAME TYPE STRING,
REFNR TYPE STRING,
TBNUM TYPE STRING,
UBNUM TYPE STRING,
VBELN TYPE STRING,
KQUIT TYPE STRING,
QDATU TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
BETYP TYPE STRING,
BENUM TYPE STRING,
DRUKZ TYPE STRING,
DRUCK TYPE STRING,
TEILK TYPE STRING,
KR2SO TYPE STRING,
KR2KU TYPE STRING,
KDISO TYPE STRING,
KZPLA TYPE STRING,
PLDAT TYPE STRING,
RSNUM TYPE STRING,
LZNUM TYPE STRING,
BDART TYPE STRING,
PKNUM TYPE STRING,
PKPOS TYPE STRING,
KZLEI TYPE STRING,
KISTZ TYPE STRING,
KISTP TYPE STRING,
PERNR TYPE STRING,
SOLWM TYPE STRING,
SOLEX TYPE STRING,
ISTWM TYPE STRING,
ZEIEI TYPE STRING,
HRSTS TYPE STRING,
STDAT TYPE STRING,
ENDAT TYPE STRING,
STUZT TYPE STRING,
ENUZT TYPE STRING,
L2SKA TYPE STRING,
MINWM TYPE STRING,
LGTOR TYPE STRING,
LGBZO TYPE STRING,
KZVEP TYPE STRING,
SWABW TYPE STRING,
AUSFB TYPE STRING,
SPEZI TYPE STRING,
VBTYP TYPE STRING,
QUEUE TYPE STRING,
KGVNQ TYPE STRING,
TAPRI TYPE STRING,
KVQUI TYPE STRING,
HUCON TYPE STRING,
NOITM TYPE STRING,
KZTRM TYPE STRING,
LATER TYPE STRING,
PASSD TYPE STRING,
MULTL TYPE STRING,
LFDAT TYPE STRING,
LFUHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCWMHDB_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_MCWMHDB_STR-SUPKZ sy-vline 
WA_MCWMHDB_STR-TB_PDATU sy-vline 
WA_MCWMHDB_STR-TB_PZEIT sy-vline 
WA_MCWMHDB_STR-TB_BDATU sy-vline 
WA_MCWMHDB_STR-TB_BZEIT sy-vline 
WA_MCWMHDB_STR-TB_UNAME sy-vline 
WA_MCWMHDB_STR-TB_STATU sy-vline 
WA_MCWMHDB_STR-TB_ANZPS sy-vline 
WA_MCWMHDB_STR-TB_BRGEW sy-vline 
WA_MCWMHDB_STR-TB_GEWEI sy-vline 
WA_MCWMHDB_STR-TB_VLTYP sy-vline 
WA_MCWMHDB_STR-TB_VLPLA sy-vline 
WA_MCWMHDB_STR-TB_VKDYN sy-vline 
WA_MCWMHDB_STR-TB_NLTYP sy-vline 
WA_MCWMHDB_STR-TB_NLPLA sy-vline 
WA_MCWMHDB_STR-TB_NKDYN sy-vline 
WA_MCWMHDB_STR-VB_VSTEL sy-vline 
WA_MCWMHDB_STR-VB_ROUTE sy-vline 
WA_MCWMHDB_STR-VB_BEROT sy-vline 
WA_MCWMHDB_STR-VB_LPRIO sy-vline 
WA_MCWMHDB_STR-VB_KODAT sy-vline 
WA_MCWMHDB_STR-VB_LDDAT sy-vline 
WA_MCWMHDB_STR-VB_BTGEW sy-vline 
WA_MCWMHDB_STR-VB_GEWEI sy-vline 
WA_MCWMHDB_STR-VB_VOLUM sy-vline 
WA_MCWMHDB_STR-VB_VOLEH sy-vline 
WA_MCWMHDB_STR-VB_KUNNR sy-vline 
WA_MCWMHDB_STR-TAPSC sy-vline 
WA_MCWMHDB_STR-DUMMY sy-vline 
WA_MCWMHDB_STR-CNTPS sy-vline 
WA_MCWMHDB_STR-NIDRU sy-vline 
WA_MCWMHDB_STR-ACTDA sy-vline 
WA_MCWMHDB_STR-TEIL2 sy-vline 
WA_MCWMHDB_STR-TEILD sy-vline 
WA_MCWMHDB_STR-BITEM sy-vline 
WA_MCWMHDB_STR-KOMIM sy-vline 
WA_MCWMHDB_STR-EINLM sy-vline 
WA_MCWMHDB_STR-MANDT sy-vline 
WA_MCWMHDB_STR-LGNUM sy-vline 
WA_MCWMHDB_STR-TANUM sy-vline 
WA_MCWMHDB_STR-BWART sy-vline 
WA_MCWMHDB_STR-BWLVS sy-vline 
WA_MCWMHDB_STR-TBPRI sy-vline 
WA_MCWMHDB_STR-TRART sy-vline 
WA_MCWMHDB_STR-BDATU sy-vline 
WA_MCWMHDB_STR-BZEIT sy-vline 
WA_MCWMHDB_STR-BNAME sy-vline 
WA_MCWMHDB_STR-REFNR sy-vline 
WA_MCWMHDB_STR-TBNUM sy-vline 
WA_MCWMHDB_STR-UBNUM sy-vline 
WA_MCWMHDB_STR-VBELN sy-vline 
WA_MCWMHDB_STR-KQUIT sy-vline 
WA_MCWMHDB_STR-QDATU sy-vline 
WA_MCWMHDB_STR-MBLNR sy-vline 
WA_MCWMHDB_STR-MJAHR sy-vline 
WA_MCWMHDB_STR-BETYP sy-vline 
WA_MCWMHDB_STR-BENUM sy-vline 
WA_MCWMHDB_STR-DRUKZ sy-vline 
WA_MCWMHDB_STR-DRUCK sy-vline 
WA_MCWMHDB_STR-TEILK sy-vline 
WA_MCWMHDB_STR-KR2SO sy-vline 
WA_MCWMHDB_STR-KR2KU sy-vline 
WA_MCWMHDB_STR-KDISO sy-vline 
WA_MCWMHDB_STR-KZPLA sy-vline 
WA_MCWMHDB_STR-PLDAT sy-vline 
WA_MCWMHDB_STR-RSNUM sy-vline 
WA_MCWMHDB_STR-LZNUM sy-vline 
WA_MCWMHDB_STR-BDART sy-vline 
WA_MCWMHDB_STR-PKNUM sy-vline 
WA_MCWMHDB_STR-PKPOS sy-vline 
WA_MCWMHDB_STR-KZLEI sy-vline 
WA_MCWMHDB_STR-KISTZ sy-vline 
WA_MCWMHDB_STR-KISTP sy-vline 
WA_MCWMHDB_STR-PERNR sy-vline 
WA_MCWMHDB_STR-SOLWM sy-vline 
WA_MCWMHDB_STR-SOLEX sy-vline 
WA_MCWMHDB_STR-ISTWM sy-vline 
WA_MCWMHDB_STR-ZEIEI sy-vline 
WA_MCWMHDB_STR-HRSTS sy-vline 
WA_MCWMHDB_STR-STDAT sy-vline 
WA_MCWMHDB_STR-ENDAT sy-vline 
WA_MCWMHDB_STR-STUZT sy-vline 
WA_MCWMHDB_STR-ENUZT sy-vline 
WA_MCWMHDB_STR-L2SKA sy-vline 
WA_MCWMHDB_STR-MINWM sy-vline 
WA_MCWMHDB_STR-LGTOR sy-vline 
WA_MCWMHDB_STR-LGBZO sy-vline 
WA_MCWMHDB_STR-KZVEP sy-vline 
WA_MCWMHDB_STR-SWABW sy-vline 
WA_MCWMHDB_STR-AUSFB sy-vline 
WA_MCWMHDB_STR-SPEZI sy-vline 
WA_MCWMHDB_STR-VBTYP sy-vline 
WA_MCWMHDB_STR-QUEUE sy-vline 
WA_MCWMHDB_STR-KGVNQ sy-vline 
WA_MCWMHDB_STR-TAPRI sy-vline 
WA_MCWMHDB_STR-KVQUI sy-vline 
WA_MCWMHDB_STR-HUCON sy-vline 
WA_MCWMHDB_STR-NOITM sy-vline 
WA_MCWMHDB_STR-KZTRM sy-vline 
WA_MCWMHDB_STR-LATER sy-vline 
WA_MCWMHDB_STR-PASSD sy-vline 
WA_MCWMHDB_STR-MULTL sy-vline 
WA_MCWMHDB_STR-LFDAT sy-vline 
WA_MCWMHDB_STR-LFUHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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