ABAP Select data from SAP table MHIS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MHIS
*  INTO TABLE @DATA(IT_MHIS2).
*--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_MHIS INDEX 1 INTO DATA(WA_MHIS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MHIS>-MANDT = 1.
<MHIS>-WARPL = 1.
<MHIS>-ABNUM = 1.
<MHIS>-ZAEHL = 1.
<MHIS>-NPLDA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MHIS-TERMA, sy-vline,
  WA_MHIS-STADT, sy-vline,
  WA_MHIS-LRMDT, sy-vline,
  WA_MHIS-OFFZE, sy-vline,
  WA_MHIS-OFFZO, sy-vline,
  WA_MHIS-ABRUD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MHIS 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_MHIS 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_MHIS INTO WA_MHIS.


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

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

*Conversion exit CUNIT, internal->external for field ADUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MHIS-ADUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MHIS-ADUNIT.
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_MHIS_STR, 
MANDT TYPE STRING,
WARPL TYPE STRING,
ABNUM TYPE STRING,
ZAEHL TYPE STRING,
NPLDA TYPE STRING,
TERMA TYPE STRING,
STADT TYPE STRING,
LRMDT TYPE STRING,
OFFZE TYPE STRING,
OFFZO TYPE STRING,
ABRUD TYPE STRING,
ABRNA TYPE STRING,
SFAKT TYPE STRING,
TERMK TYPE STRING,
VERSCH TYPE STRING,
TOLER TYPE STRING,
KNNRM TYPE STRING,
KNPRM TYPE STRING,
NPLDO TYPE STRING,
NPLDZ TYPE STRING,
MANDA TYPE STRING,
OFFLE TYPE STRING,
OFFLO TYPE STRING,
KNAUT TYPE STRING,
KNASR TYPE STRING,
TSABR TYPE STRING,
TSVBT TYPE STRING,
TSENQ TYPE STRING,
TSENM TYPE STRING,
HORDA TYPE STRING,
TSTAT TYPE STRING,
FIXDU TYPE STRING,
FIXDA TYPE STRING,
VGNUM TYPE STRING,
ZYKZT TYPE STRING,
ZYKLS TYPE STRING,
PUFFP TYPE STRING,
PUFFN TYPE STRING,
SZAEH TYPE STRING,
RZAEH TYPE STRING,
NZAEH TYPE STRING,
USERMOD TYPE STRING,
DEMAND_ID TYPE STRING,
DEMAND_NO TYPE STRING,
REVISION_NO TYPE STRING,
REV_PLANT TYPE STRING,
ADPOINT TYPE STRING,
ADANDOR TYPE STRING,
ADTGOON TYPE STRING,
ADCYCLE TYPE STRING,
ADUNIT TYPE STRING,
ADOFFSET TYPE STRING,
ADNZAEH TYPE STRING,
ADSTTIME TYPE STRING,
ADCONFTIME TYPE STRING,
CYCLESEQIND TYPE STRING,
ADEXTSTARTDATE TYPE STRING,
ADEXTSTARTTIME TYPE STRING,
ADSYSTARTDATE TYPE STRING,
ADSYSTARTTIME TYPE STRING,
ADOBJECT TYPE STRING,
SETREPEATIND TYPE STRING,
IND_MPLA_API TYPE STRING,
DUE_DATE_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MHIS_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_MHIS_STR-MANDT sy-vline 
WA_MHIS_STR-WARPL sy-vline 
WA_MHIS_STR-ABNUM sy-vline 
WA_MHIS_STR-ZAEHL sy-vline 
WA_MHIS_STR-NPLDA sy-vline 
WA_MHIS_STR-TERMA sy-vline 
WA_MHIS_STR-STADT sy-vline 
WA_MHIS_STR-LRMDT sy-vline 
WA_MHIS_STR-OFFZE sy-vline 
WA_MHIS_STR-OFFZO sy-vline 
WA_MHIS_STR-ABRUD sy-vline 
WA_MHIS_STR-ABRNA sy-vline 
WA_MHIS_STR-SFAKT sy-vline 
WA_MHIS_STR-TERMK sy-vline 
WA_MHIS_STR-VERSCH sy-vline 
WA_MHIS_STR-TOLER sy-vline 
WA_MHIS_STR-KNNRM sy-vline 
WA_MHIS_STR-KNPRM sy-vline 
WA_MHIS_STR-NPLDO sy-vline 
WA_MHIS_STR-NPLDZ sy-vline 
WA_MHIS_STR-MANDA sy-vline 
WA_MHIS_STR-OFFLE sy-vline 
WA_MHIS_STR-OFFLO sy-vline 
WA_MHIS_STR-KNAUT sy-vline 
WA_MHIS_STR-KNASR sy-vline 
WA_MHIS_STR-TSABR sy-vline 
WA_MHIS_STR-TSVBT sy-vline 
WA_MHIS_STR-TSENQ sy-vline 
WA_MHIS_STR-TSENM sy-vline 
WA_MHIS_STR-HORDA sy-vline 
WA_MHIS_STR-TSTAT sy-vline 
WA_MHIS_STR-FIXDU sy-vline 
WA_MHIS_STR-FIXDA sy-vline 
WA_MHIS_STR-VGNUM sy-vline 
WA_MHIS_STR-ZYKZT sy-vline 
WA_MHIS_STR-ZYKLS sy-vline 
WA_MHIS_STR-PUFFP sy-vline 
WA_MHIS_STR-PUFFN sy-vline 
WA_MHIS_STR-SZAEH sy-vline 
WA_MHIS_STR-RZAEH sy-vline 
WA_MHIS_STR-NZAEH sy-vline 
WA_MHIS_STR-USERMOD sy-vline 
WA_MHIS_STR-DEMAND_ID sy-vline 
WA_MHIS_STR-DEMAND_NO sy-vline 
WA_MHIS_STR-REVISION_NO sy-vline 
WA_MHIS_STR-REV_PLANT sy-vline 
WA_MHIS_STR-ADPOINT sy-vline 
WA_MHIS_STR-ADANDOR sy-vline 
WA_MHIS_STR-ADTGOON sy-vline 
WA_MHIS_STR-ADCYCLE sy-vline 
WA_MHIS_STR-ADUNIT sy-vline 
WA_MHIS_STR-ADOFFSET sy-vline 
WA_MHIS_STR-ADNZAEH sy-vline 
WA_MHIS_STR-ADSTTIME sy-vline 
WA_MHIS_STR-ADCONFTIME sy-vline 
WA_MHIS_STR-CYCLESEQIND sy-vline 
WA_MHIS_STR-ADEXTSTARTDATE sy-vline 
WA_MHIS_STR-ADEXTSTARTTIME sy-vline 
WA_MHIS_STR-ADSYSTARTDATE sy-vline 
WA_MHIS_STR-ADSYSTARTTIME sy-vline 
WA_MHIS_STR-ADOBJECT sy-vline 
WA_MHIS_STR-SETREPEATIND sy-vline 
WA_MHIS_STR-IND_MPLA_API sy-vline 
WA_MHIS_STR-DUE_DATE_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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