ABAP Select data from SAP table MDHD 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 MDHD 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 MDHD. 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 MDHD 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_MDHD TYPE STANDARD TABLE OF MDHD,
      WA_MDHD TYPE MDHD,
      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: <MDHD> TYPE MDHD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDHD
*  INTO TABLE @DATA(IT_MDHD2).
*--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_MDHD INDEX 1 INTO DATA(WA_MDHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDHD>-DISST = 1.
<MDHD>-MATNR = 1.
<MDHD>-EXMAT = 1.
<MDHD>-WERKS = 1.
<MDHD>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDHD-BERID, sy-vline,
  WA_MDHD-TXWRK, sy-vline,
  WA_MDHD-BERTX, sy-vline,
  WA_MDHD-SGSRC, sy-vline,
  WA_MDHD-PLWRK, sy-vline,
  WA_MDHD-PLSCN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDHD 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_MDHD 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_MDHD INTO WA_MDHD.


*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_MDHD-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDHD-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit SXIDN, internal->external for field DSMAL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_MDHD-DSMAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDHD-DSMAL.
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_MDHD_STR, 
DISST TYPE STRING,
MATNR TYPE STRING,
EXMAT TYPE STRING,
WERKS TYPE STRING,
LIFNR TYPE STRING,
BERID TYPE STRING,
TXWRK TYPE STRING,
BERTX TYPE STRING,
SGSRC TYPE STRING,
PLWRK TYPE STRING,
PLSCN TYPE STRING,
MAKTX TYPE STRING,
DISPO TYPE STRING,
BDBKZ TYPE STRING,
MTART TYPE STRING,
DISMM TYPE STRING,
MEINS TYPE STRING,
BESKZ TYPE STRING,
SOBES TYPE STRING,
ESOBS TYPE STRING,
DTNUM TYPE STRING,
BERW1 TYPE STRING,
BERW2 TYPE STRING,
BERW4 TYPE STRING,
DSDAT TYPE STRING,
KZPROMO TYPE STRING,
MAKZG TYPE STRING,
SUM01 TYPE STRING,
BERX1 TYPE STRING,
BERX2 TYPE STRING,
BERX3 TYPE STRING,
ALINE TYPE STRING,
ABLKZ TYPE STRING,
LAZKZ TYPE STRING,
KZSEASN TYPE STRING,
MAABC TYPE STRING,
EXPAND TYPE STRING,
INFO TYPE STRING,
DSNAM TYPE STRING,
DSTEL TYPE STRING,
DSMAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDHD_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_MDHD_STR-DISST sy-vline 
WA_MDHD_STR-MATNR sy-vline 
WA_MDHD_STR-EXMAT sy-vline 
WA_MDHD_STR-WERKS sy-vline 
WA_MDHD_STR-LIFNR sy-vline 
WA_MDHD_STR-BERID sy-vline 
WA_MDHD_STR-TXWRK sy-vline 
WA_MDHD_STR-BERTX sy-vline 
WA_MDHD_STR-SGSRC sy-vline 
WA_MDHD_STR-PLWRK sy-vline 
WA_MDHD_STR-PLSCN sy-vline 
WA_MDHD_STR-MAKTX sy-vline 
WA_MDHD_STR-DISPO sy-vline 
WA_MDHD_STR-BDBKZ sy-vline 
WA_MDHD_STR-MTART sy-vline 
WA_MDHD_STR-DISMM sy-vline 
WA_MDHD_STR-MEINS sy-vline 
WA_MDHD_STR-BESKZ sy-vline 
WA_MDHD_STR-SOBES sy-vline 
WA_MDHD_STR-ESOBS sy-vline 
WA_MDHD_STR-DTNUM sy-vline 
WA_MDHD_STR-BERW1 sy-vline 
WA_MDHD_STR-BERW2 sy-vline 
WA_MDHD_STR-BERW4 sy-vline 
WA_MDHD_STR-DSDAT sy-vline 
WA_MDHD_STR-KZPROMO sy-vline 
WA_MDHD_STR-MAKZG sy-vline 
WA_MDHD_STR-SUM01 sy-vline 
WA_MDHD_STR-BERX1 sy-vline 
WA_MDHD_STR-BERX2 sy-vline 
WA_MDHD_STR-BERX3 sy-vline 
WA_MDHD_STR-ALINE sy-vline 
WA_MDHD_STR-ABLKZ sy-vline 
WA_MDHD_STR-LAZKZ sy-vline 
WA_MDHD_STR-KZSEASN sy-vline 
WA_MDHD_STR-MAABC sy-vline 
WA_MDHD_STR-EXPAND sy-vline 
WA_MDHD_STR-INFO sy-vline 
WA_MDHD_STR-DSNAM sy-vline 
WA_MDHD_STR-DSTEL sy-vline 
WA_MDHD_STR-DSMAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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