ABAP Select data from SAP table MCP6_LI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCP6_LI 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 MCP6_LI. 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 MCP6_LI 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_MCP6_LI TYPE STANDARD TABLE OF MCP6_LI,
      WA_MCP6_LI TYPE MCP6_LI,
      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: <MCP6_LI> TYPE MCP6_LI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCP6_LI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCP6_LI
  INTO TABLE IT_MCP6_LI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCP6_LI
*  INTO TABLE @DATA(IT_MCP6_LI2).
*--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_MCP6_LI INDEX 1 INTO DATA(WA_MCP6_LI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCP6_LI ASSIGNING <MCP6_LI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCP6_LI>-BLOCKID = 1.
<MCP6_LI>-LINE = 1.
<MCP6_LI>-LINETYPE = 1.
<MCP6_LI>-KRIT1 = 1.
<MCP6_LI>-FNAME = 1.

ENDLOOP.

LOOP AT IT_MCP6_LI INTO WA_MCP6_LI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCP6_LI-TABHK, sy-vline,
  WA_MCP6_LI-FELDH, sy-vline,
  WA_MCP6_LI-LINKZ, sy-vline,
  WA_MCP6_LI-INFUN, sy-vline,
  WA_MCP6_LI-OUFUN, sy-vline,
  WA_MCP6_LI-VGFUN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCP6_LI 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_MCP6_LI 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_MCP6_LI INTO WA_MCP6_LI.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MCP6_LI_STR, 
BLOCKID TYPE STRING,
LINE TYPE STRING,
LINETYPE TYPE STRING,
KRIT1 TYPE STRING,
FNAME TYPE STRING,
TABHK TYPE STRING,
FELDH TYPE STRING,
LINKZ TYPE STRING,
INFUN TYPE STRING,
OUFUN TYPE STRING,
VGFUN TYPE STRING,
FLGIS TYPE STRING,
FLGEV TYPE STRING,
FLGFC TYPE STRING,
FLGVI TYPE STRING,
FLGDS TYPE STRING,
FLGDZ TYPE STRING,
NKFIX TYPE STRING,
ANZNK TYPE STRING,
DDICT TYPE STRING,
FREET TYPE STRING,
PLOBT TYPE STRING,
LTEXT TYPE STRING,
PFIELD TYPE STRING,
DOMNAME TYPE STRING,
PMATF TYPE STRING,
RETYP TYPE STRING,
RELEN TYPE STRING,
BASRE TYPE STRING,
STRUL TYPE STRING,
OBLIG TYPE STRING,
INPUT TYPE STRING,
OUTPUT TYPE STRING,
INTENS TYPE STRING,
HIDDEN TYPE STRING,
LENGTH TYPE STRING,
AWAHL TYPE STRING,
FLGPG TYPE STRING,
ELINE TYPE STRING,
EFNAME TYPE STRING,
KAPALI TYPE STRING,
MARKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCP6_LI_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_MCP6_LI_STR-BLOCKID sy-vline 
WA_MCP6_LI_STR-LINE sy-vline 
WA_MCP6_LI_STR-LINETYPE sy-vline 
WA_MCP6_LI_STR-KRIT1 sy-vline 
WA_MCP6_LI_STR-FNAME sy-vline 
WA_MCP6_LI_STR-TABHK sy-vline 
WA_MCP6_LI_STR-FELDH sy-vline 
WA_MCP6_LI_STR-LINKZ sy-vline 
WA_MCP6_LI_STR-INFUN sy-vline 
WA_MCP6_LI_STR-OUFUN sy-vline 
WA_MCP6_LI_STR-VGFUN sy-vline 
WA_MCP6_LI_STR-FLGIS sy-vline 
WA_MCP6_LI_STR-FLGEV sy-vline 
WA_MCP6_LI_STR-FLGFC sy-vline 
WA_MCP6_LI_STR-FLGVI sy-vline 
WA_MCP6_LI_STR-FLGDS sy-vline 
WA_MCP6_LI_STR-FLGDZ sy-vline 
WA_MCP6_LI_STR-NKFIX sy-vline 
WA_MCP6_LI_STR-ANZNK sy-vline 
WA_MCP6_LI_STR-DDICT sy-vline 
WA_MCP6_LI_STR-FREET sy-vline 
WA_MCP6_LI_STR-PLOBT sy-vline 
WA_MCP6_LI_STR-LTEXT sy-vline 
WA_MCP6_LI_STR-PFIELD sy-vline 
WA_MCP6_LI_STR-DOMNAME sy-vline 
WA_MCP6_LI_STR-PMATF sy-vline 
WA_MCP6_LI_STR-RETYP sy-vline 
WA_MCP6_LI_STR-RELEN sy-vline 
WA_MCP6_LI_STR-BASRE sy-vline 
WA_MCP6_LI_STR-STRUL sy-vline 
WA_MCP6_LI_STR-OBLIG sy-vline 
WA_MCP6_LI_STR-INPUT sy-vline 
WA_MCP6_LI_STR-OUTPUT sy-vline 
WA_MCP6_LI_STR-INTENS sy-vline 
WA_MCP6_LI_STR-HIDDEN sy-vline 
WA_MCP6_LI_STR-LENGTH sy-vline 
WA_MCP6_LI_STR-AWAHL sy-vline 
WA_MCP6_LI_STR-FLGPG sy-vline 
WA_MCP6_LI_STR-ELINE sy-vline 
WA_MCP6_LI_STR-EFNAME sy-vline 
WA_MCP6_LI_STR-KAPALI sy-vline 
WA_MCP6_LI_STR-MARKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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