ABAP Select data from SAP table F4MCHLP3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP F4MCHLP3 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 F4MCHLP3. 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 F4MCHLP3 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_F4MCHLP3 TYPE STANDARD TABLE OF F4MCHLP3,
      WA_F4MCHLP3 TYPE F4MCHLP3,
      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: <F4MCHLP3> TYPE F4MCHLP3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_F4MCHLP3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM F4MCHLP3
  INTO TABLE IT_F4MCHLP3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM F4MCHLP3
*  INTO TABLE @DATA(IT_F4MCHLP32).
*--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_F4MCHLP3 INDEX 1 INTO DATA(WA_F4MCHLP32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_F4MCHLP3 ASSIGNING <F4MCHLP3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<F4MCHLP3>-TABNAME = 1.
<F4MCHLP3>-FIELDNAME = 1.
<F4MCHLP3>-OFFSET = 1.
<F4MCHLP3>-LENG = 1.
<F4MCHLP3>-DATATYPE = 1.

ENDLOOP.

LOOP AT IT_F4MCHLP3 INTO WA_F4MCHLP3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_F4MCHLP3-INTLEN, sy-vline,
  WA_F4MCHLP3-OUTPUTLEN, sy-vline,
  WA_F4MCHLP3-INTTYPE, sy-vline,
  WA_F4MCHLP3-CONVEXIT, sy-vline,
  WA_F4MCHLP3-HEADLEN, sy-vline,
  WA_F4MCHLP3-SCRLEN1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_F4MCHLP3 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_F4MCHLP3 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_F4MCHLP3 INTO WA_F4MCHLP3.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_F4MCHLP3-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_F4MCHLP3-DATATYPE.
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_F4MCHLP3_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
OFFSET TYPE STRING,
LENG TYPE STRING,
DATATYPE TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
INTTYPE TYPE STRING,
CONVEXIT TYPE STRING,
HEADLEN TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
LOWERCASE TYPE STRING,
MEMID TYPE STRING,
GPA TYPE STRING,
SPA TYPE STRING,
OUTLINE TYPE STRING,
OUTCOL TYPE STRING,
MCFIELDID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_F4MCHLP3_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_F4MCHLP3_STR-TABNAME sy-vline 
WA_F4MCHLP3_STR-FIELDNAME sy-vline 
WA_F4MCHLP3_STR-OFFSET sy-vline 
WA_F4MCHLP3_STR-LENG sy-vline 
WA_F4MCHLP3_STR-DATATYPE sy-vline 
WA_F4MCHLP3_STR-INTLEN sy-vline 
WA_F4MCHLP3_STR-OUTPUTLEN sy-vline 
WA_F4MCHLP3_STR-INTTYPE sy-vline 
WA_F4MCHLP3_STR-CONVEXIT sy-vline 
WA_F4MCHLP3_STR-HEADLEN sy-vline 
WA_F4MCHLP3_STR-SCRLEN1 sy-vline 
WA_F4MCHLP3_STR-SCRLEN2 sy-vline 
WA_F4MCHLP3_STR-SCRLEN3 sy-vline 
WA_F4MCHLP3_STR-REPTEXT sy-vline 
WA_F4MCHLP3_STR-SCRTEXT_S sy-vline 
WA_F4MCHLP3_STR-SCRTEXT_M sy-vline 
WA_F4MCHLP3_STR-SCRTEXT_L sy-vline 
WA_F4MCHLP3_STR-LOWERCASE sy-vline 
WA_F4MCHLP3_STR-MEMID sy-vline 
WA_F4MCHLP3_STR-GPA sy-vline 
WA_F4MCHLP3_STR-SPA sy-vline 
WA_F4MCHLP3_STR-OUTLINE sy-vline 
WA_F4MCHLP3_STR-OUTCOL sy-vline 
WA_F4MCHLP3_STR-MCFIELDID sy-vline      INTO ld_text SEPARATED BY SPACE.

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