ABAP Select data from SAP table MILL_CL_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MILL_CL_HEADER
*  INTO TABLE @DATA(IT_MILL_CL_HEADER2).
*--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_MILL_CL_HEADER INDEX 1 INTO DATA(WA_MILL_CL_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MILL_CL_HEADER>-MATNR = 1.
<MILL_CL_HEADER>-MAKTX = 1.
<MILL_CL_HEADER>-WERKS = 1.
<MILL_CL_HEADER>-NAME1 = 1.
<MILL_CL_HEADER>-MD04ICON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MILL_CL_HEADER-MM03ICON, sy-vline,
  WA_MILL_CL_HEADER-LGORT, sy-vline,
  WA_MILL_CL_HEADER-BOX, sy-vline,
  WA_MILL_CL_HEADER-CVAL0, sy-vline,
  WA_MILL_CL_HEADER-CVAL1, sy-vline,
  WA_MILL_CL_HEADER-CVAL2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MILL_CL_HEADER 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_MILL_CL_HEADER 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_MILL_CL_HEADER INTO WA_MILL_CL_HEADER.


*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_MILL_CL_HEADER-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MILL_CL_HEADER-MATNR.
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_MILL_CL_HEADER_STR, 
MATNR TYPE STRING,
MAKTX TYPE STRING,
WERKS TYPE STRING,
NAME1 TYPE STRING,
MD04ICON TYPE STRING,
MM03ICON TYPE STRING,
LGORT TYPE STRING,
BOX TYPE STRING,
CVAL0 TYPE STRING,
CVAL1 TYPE STRING,
CVAL2 TYPE STRING,
CVAL3 TYPE STRING,
CVAL4 TYPE STRING,
CVAL5 TYPE STRING,
CVAL6 TYPE STRING,
CVAL7 TYPE STRING,
CVAL8 TYPE STRING,
CVAL9 TYPE STRING,
NVAL0 TYPE STRING,
NVAL1 TYPE STRING,
NVAL2 TYPE STRING,
NVAL3 TYPE STRING,
NVAL4 TYPE STRING,
NVAL5 TYPE STRING,
NVAL6 TYPE STRING,
NVAL7 TYPE STRING,
NVAL8 TYPE STRING,
NVAL9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MILL_CL_HEADER_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_MILL_CL_HEADER_STR-MATNR sy-vline 
WA_MILL_CL_HEADER_STR-MAKTX sy-vline 
WA_MILL_CL_HEADER_STR-WERKS sy-vline 
WA_MILL_CL_HEADER_STR-NAME1 sy-vline 
WA_MILL_CL_HEADER_STR-MD04ICON sy-vline 
WA_MILL_CL_HEADER_STR-MM03ICON sy-vline 
WA_MILL_CL_HEADER_STR-LGORT sy-vline 
WA_MILL_CL_HEADER_STR-BOX sy-vline 
WA_MILL_CL_HEADER_STR-CVAL0 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL1 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL2 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL3 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL4 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL5 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL6 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL7 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL8 sy-vline 
WA_MILL_CL_HEADER_STR-CVAL9 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL0 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL1 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL2 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL3 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL4 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL5 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL6 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL7 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL8 sy-vline 
WA_MILL_CL_HEADER_STR-NVAL9 sy-vline      INTO ld_text SEPARATED BY SPACE.

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