ABAP Select data from SAP table M_OIKLA into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_OIKLA
*  INTO TABLE @DATA(IT_M_OIKLA2).
*--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_M_OIKLA INDEX 1 INTO DATA(WA_M_OIKLA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_OIKLA>-CLIENT = 1.
<M_OIKLA>-LIDNO = 1.
<M_OIKLA>-LIDTYPE = 1.
<M_OIKLA>-CONTRTYP = 1.
<M_OIKLA>-LIDDESC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_OIKLA-LIDACTIND, sy-vline,
  WA_M_OIKLA-LIDDELIND, sy-vline,
  WA_M_OIKLA-LIDBLKIND, sy-vline,
  WA_M_OIKLA-CREAAUTHOR, sy-vline,
  WA_M_OIKLA-CREADATE, sy-vline,
  WA_M_OIKLA-CHAUTHOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_OIKLA 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_M_OIKLA 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_M_OIKLA INTO WA_M_OIKLA.


*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 LIDNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_OIKLA-LIDNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_OIKLA-LIDNO.
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_M_OIKLA_STR, 
CLIENT TYPE STRING,
LIDNO TYPE STRING,
LIDTYPE TYPE STRING,
CONTRTYP TYPE STRING,
LIDDESC TYPE STRING,
LIDACTIND TYPE STRING,
LIDDELIND TYPE STRING,
LIDBLKIND TYPE STRING,
CREAAUTHOR TYPE STRING,
CREADATE TYPE STRING,
CHAUTHOR TYPE STRING,
CHDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_OIKLA_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_M_OIKLA_STR-CLIENT sy-vline 
WA_M_OIKLA_STR-LIDNO sy-vline 
WA_M_OIKLA_STR-LIDTYPE sy-vline 
WA_M_OIKLA_STR-CONTRTYP sy-vline 
WA_M_OIKLA_STR-LIDDESC sy-vline 
WA_M_OIKLA_STR-LIDACTIND sy-vline 
WA_M_OIKLA_STR-LIDDELIND sy-vline 
WA_M_OIKLA_STR-LIDBLKIND sy-vline 
WA_M_OIKLA_STR-CREAAUTHOR sy-vline 
WA_M_OIKLA_STR-CREADATE sy-vline 
WA_M_OIKLA_STR-CHAUTHOR sy-vline 
WA_M_OIKLA_STR-CHDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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