ABAP Select data from SAP table MCH1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCH1 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 MCH1. 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 MCH1 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_MCH1 TYPE STANDARD TABLE OF MCH1,
      WA_MCH1 TYPE MCH1,
      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: <MCH1> TYPE MCH1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCH1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCH1
  INTO TABLE IT_MCH1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCH1
*  INTO TABLE @DATA(IT_MCH12).
*--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_MCH1 INDEX 1 INTO DATA(WA_MCH12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCH1 ASSIGNING <MCH1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCH1>-MANDT = 1.
<MCH1>-MATNR = 1.
<MCH1>-CHARG = 1.
<MCH1>-LVORM = 1.
<MCH1>-ERSDA = 1.

ENDLOOP.

LOOP AT IT_MCH1 INTO WA_MCH1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCH1-ERNAM, sy-vline,
  WA_MCH1-AENAM, sy-vline,
  WA_MCH1-LAEDA, sy-vline,
  WA_MCH1-VERAB, sy-vline,
  WA_MCH1-VFDAT, sy-vline,
  WA_MCH1-ZUSCH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCH1 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_MCH1 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_MCH1 INTO WA_MCH1.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCH1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH1-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH1-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field VLMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCH1-VLMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH1-VLMAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field CHAME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCH1-CHAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH1-CHAME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field /STTPEC/SYNCTIME
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_MCH1-/STTPEC/SYNCTIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH1-/STTPEC/SYNCTIME.
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_MCH1_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
CHARG TYPE STRING,
LVORM TYPE STRING,
ERSDA TYPE STRING,
ERNAM TYPE STRING,
AENAM TYPE STRING,
LAEDA TYPE STRING,
VERAB TYPE STRING,
VFDAT TYPE STRING,
ZUSCH TYPE STRING,
ZUSTD TYPE STRING,
ZAEDT TYPE STRING,
LIFNR TYPE STRING,
LICHA TYPE STRING,
VLCHA TYPE STRING,
VLWRK TYPE STRING,
VLMAT TYPE STRING,
BATCH_ID TYPE STRING,
XPCBT TYPE STRING,
CHAME TYPE STRING,
LWEDT TYPE STRING,
FVDT1 TYPE STRING,
FVDT2 TYPE STRING,
FVDT3 TYPE STRING,
FVDT4 TYPE STRING,
FVDT5 TYPE STRING,
FVDT6 TYPE STRING,
HERKL TYPE STRING,
HERKR TYPE STRING,
MTVER TYPE STRING,
QNDAT TYPE STRING,
HSDAT TYPE STRING,
CUOBJ_BM TYPE STRING,
DEACT_BM TYPE STRING,
BATCH_TYPE TYPE STRING,
SGT_SCAT TYPE STRING,
ERSDA_TMSTP TYPE STRING,
ERSDA_TZ_SYS TYPE STRING,
ERSDA_TZ_USR TYPE STRING,
ZFDAT TYPE STRING,
CREATION_DATETIME TYPE STRING,
LASTCHANGE_DATETIME TYPE STRING,
/STTPEC/SERTYPE TYPE STRING,
/STTPEC/PLANT TYPE STRING,
/STTPEC/SYNCTIME TYPE STRING,
/STTPEC/SYNCACT TYPE STRING,
FSH_SEASON_YEAR TYPE STRING,
FSH_SEASON TYPE STRING,
FSH_COLLECTION TYPE STRING,
FSH_THEME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCH1_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_MCH1_STR-MANDT sy-vline 
WA_MCH1_STR-MATNR sy-vline 
WA_MCH1_STR-CHARG sy-vline 
WA_MCH1_STR-LVORM sy-vline 
WA_MCH1_STR-ERSDA sy-vline 
WA_MCH1_STR-ERNAM sy-vline 
WA_MCH1_STR-AENAM sy-vline 
WA_MCH1_STR-LAEDA sy-vline 
WA_MCH1_STR-VERAB sy-vline 
WA_MCH1_STR-VFDAT sy-vline 
WA_MCH1_STR-ZUSCH sy-vline 
WA_MCH1_STR-ZUSTD sy-vline 
WA_MCH1_STR-ZAEDT sy-vline 
WA_MCH1_STR-LIFNR sy-vline 
WA_MCH1_STR-LICHA sy-vline 
WA_MCH1_STR-VLCHA sy-vline 
WA_MCH1_STR-VLWRK sy-vline 
WA_MCH1_STR-VLMAT sy-vline 
WA_MCH1_STR-BATCH_ID sy-vline 
WA_MCH1_STR-XPCBT sy-vline 
WA_MCH1_STR-CHAME sy-vline 
WA_MCH1_STR-LWEDT sy-vline 
WA_MCH1_STR-FVDT1 sy-vline 
WA_MCH1_STR-FVDT2 sy-vline 
WA_MCH1_STR-FVDT3 sy-vline 
WA_MCH1_STR-FVDT4 sy-vline 
WA_MCH1_STR-FVDT5 sy-vline 
WA_MCH1_STR-FVDT6 sy-vline 
WA_MCH1_STR-HERKL sy-vline 
WA_MCH1_STR-HERKR sy-vline 
WA_MCH1_STR-MTVER sy-vline 
WA_MCH1_STR-QNDAT sy-vline 
WA_MCH1_STR-HSDAT sy-vline 
WA_MCH1_STR-CUOBJ_BM sy-vline 
WA_MCH1_STR-DEACT_BM sy-vline 
WA_MCH1_STR-BATCH_TYPE sy-vline 
WA_MCH1_STR-SGT_SCAT sy-vline 
WA_MCH1_STR-ERSDA_TMSTP sy-vline 
WA_MCH1_STR-ERSDA_TZ_SYS sy-vline 
WA_MCH1_STR-ERSDA_TZ_USR sy-vline 
WA_MCH1_STR-ZFDAT sy-vline 
WA_MCH1_STR-CREATION_DATETIME sy-vline 
WA_MCH1_STR-LASTCHANGE_DATETIME sy-vline 
WA_MCH1_STR-/STTPEC/SERTYPE sy-vline 
WA_MCH1_STR-/STTPEC/PLANT sy-vline 
WA_MCH1_STR-/STTPEC/SYNCTIME sy-vline 
WA_MCH1_STR-/STTPEC/SYNCACT sy-vline 
WA_MCH1_STR-FSH_SEASON_YEAR sy-vline 
WA_MCH1_STR-FSH_SEASON sy-vline 
WA_MCH1_STR-FSH_COLLECTION sy-vline 
WA_MCH1_STR-FSH_THEME sy-vline      INTO ld_text SEPARATED BY SPACE.

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