ABAP Select data from SAP table MCH_MMPT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCH_MMPT
*  INTO TABLE @DATA(IT_MCH_MMPT2).
*--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_MCH_MMPT INDEX 1 INTO DATA(WA_MCH_MMPT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCH_MMPT>-MANDT = 1.
<MCH_MMPT>-WARPL = 1.
<MCH_MMPT>-NUMMER = 1.
<MCH_MMPT>-ZYKL1 = 1.
<MCH_MMPT>-ZEIEH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCH_MMPT-PAK_TEXT, sy-vline,
  WA_MCH_MMPT-POINT, sy-vline,
  WA_MCH_MMPT-OFFSET, sy-vline,
  WA_MCH_MMPT-INAKTIV, sy-vline,
  WA_MCH_MMPT-CYCLESEQIND, sy-vline,
  WA_MCH_MMPT-SETREPEATIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCH_MMPT 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_MCH_MMPT 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_MCH_MMPT INTO WA_MCH_MMPT.


*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_MCH_MMPT-WARPL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MMPT-WARPL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ZYKL1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MMPT-ZYKL1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MMPT-ZYKL1.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field OFFSET
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MMPT-OFFSET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MMPT-OFFSET.
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_MCH_MMPT_STR, 
MANDT TYPE STRING,
WARPL TYPE STRING,
NUMMER TYPE STRING,
ZYKL1 TYPE STRING,
ZEIEH TYPE STRING,
PAK_TEXT TYPE STRING,
POINT TYPE STRING,
OFFSET TYPE STRING,
INAKTIV TYPE STRING,
CYCLESEQIND TYPE STRING,
SETREPEATIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCH_MMPT_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_MCH_MMPT_STR-MANDT sy-vline 
WA_MCH_MMPT_STR-WARPL sy-vline 
WA_MCH_MMPT_STR-NUMMER sy-vline 
WA_MCH_MMPT_STR-ZYKL1 sy-vline 
WA_MCH_MMPT_STR-ZEIEH sy-vline 
WA_MCH_MMPT_STR-PAK_TEXT sy-vline 
WA_MCH_MMPT_STR-POINT sy-vline 
WA_MCH_MMPT_STR-OFFSET sy-vline 
WA_MCH_MMPT_STR-INAKTIV sy-vline 
WA_MCH_MMPT_STR-CYCLESEQIND sy-vline 
WA_MCH_MMPT_STR-SETREPEATIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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