ABAP Select data from SAP table MLWIPS_ML_MOST_DETAILED into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLWIPS_ML_MOST_DETAILED
*  INTO TABLE @DATA(IT_MLWIPS_ML_MOST_DETAILED2).
*--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_MLWIPS_ML_MOST_DETAILED INDEX 1 INTO DATA(WA_MLWIPS_ML_MOST_DETAILED2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLWIPS_ML_MOST_DETAILED>-OBJNR = 1.
<MLWIPS_ML_MOST_DETAILED>-OBJID = 1.
<MLWIPS_ML_MOST_DETAILED>-KALNR = 1.
<MLWIPS_ML_MOST_DETAILED>-WERKS = 1.
<MLWIPS_ML_MOST_DETAILED>-OTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLWIPS_ML_MOST_DETAILED-REFYEAR, sy-vline,
  WA_MLWIPS_ML_MOST_DETAILED-PERIOD, sy-vline,
  WA_MLWIPS_ML_MOST_DETAILED-MEINH, sy-vline,
  WA_MLWIPS_ML_MOST_DETAILED-WIP, sy-vline,
  WA_MLWIPS_ML_MOST_DETAILED-DELTA, sy-vline,
  WA_MLWIPS_ML_MOST_DETAILED-VALUE_GES_KOKR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLWIPS_ML_MOST_DETAILED 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_MLWIPS_ML_MOST_DETAILED 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_MLWIPS_ML_MOST_DETAILED INTO WA_MLWIPS_ML_MOST_DETAILED.


*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 GJAHR, internal->external for field REFYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLWIPS_ML_MOST_DETAILED-REFYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLWIPS_ML_MOST_DETAILED-REFYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MLWIPS_ML_MOST_DETAILED-MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLWIPS_ML_MOST_DETAILED-MEINH.
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_MLWIPS_ML_MOST_DETAILED_STR, 
OBJNR TYPE STRING,
OBJID TYPE STRING,
KALNR TYPE STRING,
WERKS TYPE STRING,
OTYPE TYPE STRING,
REFYEAR TYPE STRING,
PERIOD TYPE STRING,
MEINH TYPE STRING,
WIP TYPE STRING,
DELTA TYPE STRING,
VALUE_GES_KOKR TYPE STRING,
VALUE_PER_KOKR TYPE STRING,
VALUE_GES_BUKR TYPE STRING,
VALUE_PER_BUKR TYPE STRING,
PRD_KOKR TYPE STRING,
PRD_BUKR TYPE STRING,
ESTPRD_KOKR TYPE STRING,
ESTPRD_BUKR TYPE STRING,
ESTKDM_KOKR TYPE STRING,
ESTKDM_BUKR TYPE STRING,
MSTPRD_KOKR TYPE STRING,
MSTPRD_BUKR TYPE STRING,
MSTKDM_KOKR TYPE STRING,
MSTKDM_BUKR TYPE STRING,
KWAER TYPE STRING,
OWAER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLWIPS_ML_MOST_DETAILED_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_MLWIPS_ML_MOST_DETAILED_STR-OBJNR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-OBJID sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-KALNR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-WERKS sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-OTYPE sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-REFYEAR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-PERIOD sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-MEINH sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-WIP sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-DELTA sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-VALUE_GES_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-VALUE_PER_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-VALUE_GES_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-VALUE_PER_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-PRD_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-PRD_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-ESTPRD_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-ESTPRD_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-ESTKDM_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-ESTKDM_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-MSTPRD_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-MSTPRD_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-MSTKDM_KOKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-MSTKDM_BUKR sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-KWAER sy-vline 
WA_MLWIPS_ML_MOST_DETAILED_STR-OWAER sy-vline      INTO ld_text SEPARATED BY SPACE.

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