ABAP Select data from SAP table LIST_COL_C into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LIST_COL_C
*  INTO TABLE @DATA(IT_LIST_COL_C2).
*--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_LIST_COL_C INDEX 1 INTO DATA(WA_LIST_COL_C2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LIST_COL_C>-BLOCK = 1.
<LIST_COL_C>-SEQUE = 1.
<LIST_COL_C>-TABNAME = 1.
<LIST_COL_C>-FIELDNAME = 1.
<LIST_COL_C>-LANGU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LIST_COL_C-POSITION, sy-vline,
  WA_LIST_COL_C-OFFSET, sy-vline,
  WA_LIST_COL_C-KEYFLAG, sy-vline,
  WA_LIST_COL_C-FIELDTEXT, sy-vline,
  WA_LIST_COL_C-DATATYPE, sy-vline,
  WA_LIST_COL_C-INTTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LIST_COL_C 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_LIST_COL_C 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_LIST_COL_C INTO WA_LIST_COL_C.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_LIST_COL_C-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_COL_C-LANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_LIST_COL_C-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LIST_COL_C-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_LIST_COL_C_STR, 
BLOCK TYPE STRING,
SEQUE TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
LANGU TYPE STRING,
POSITION TYPE STRING,
OFFSET TYPE STRING,
KEYFLAG TYPE STRING,
FIELDTEXT TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
DDLEN TYPE STRING,
INTLEN TYPE STRING,
DECIMALS TYPE STRING,
CHECKTABLE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
LOGFLAG TYPE STRING,
MEMORYID TYPE STRING,
LOWERCASE TYPE STRING,
SIGN TYPE STRING,
VALEXI TYPE STRING,
NOFORKEY TYPE STRING,
CONVEXIT TYPE STRING,
OUTPUTLEN 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,
MASK TYPE STRING,
IMPORTANCE TYPE STRING,
POS_START TYPE STRING,
POS_VLINE TYPE STRING,
WIDTH TYPE STRING,
EXT_ACTION TYPE STRING,
PRIORITY TYPE STRING,
COLOR TYPE STRING,
INPUT TYPE STRING,
INVERS TYPE STRING,
INTENS TYPE STRING,
SCROLL_TYP TYPE STRING,
COL_TYPE TYPE STRING,
POWER_TEN TYPE STRING,
HIDE TYPE STRING,
EXIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LIST_COL_C_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_LIST_COL_C_STR-BLOCK sy-vline 
WA_LIST_COL_C_STR-SEQUE sy-vline 
WA_LIST_COL_C_STR-TABNAME sy-vline 
WA_LIST_COL_C_STR-FIELDNAME sy-vline 
WA_LIST_COL_C_STR-LANGU sy-vline 
WA_LIST_COL_C_STR-POSITION sy-vline 
WA_LIST_COL_C_STR-OFFSET sy-vline 
WA_LIST_COL_C_STR-KEYFLAG sy-vline 
WA_LIST_COL_C_STR-FIELDTEXT sy-vline 
WA_LIST_COL_C_STR-DATATYPE sy-vline 
WA_LIST_COL_C_STR-INTTYPE sy-vline 
WA_LIST_COL_C_STR-DDLEN sy-vline 
WA_LIST_COL_C_STR-INTLEN sy-vline 
WA_LIST_COL_C_STR-DECIMALS sy-vline 
WA_LIST_COL_C_STR-CHECKTABLE sy-vline 
WA_LIST_COL_C_STR-REFTABLE sy-vline 
WA_LIST_COL_C_STR-REFFIELD sy-vline 
WA_LIST_COL_C_STR-PRECFIELD sy-vline 
WA_LIST_COL_C_STR-LOGFLAG sy-vline 
WA_LIST_COL_C_STR-MEMORYID sy-vline 
WA_LIST_COL_C_STR-LOWERCASE sy-vline 
WA_LIST_COL_C_STR-SIGN sy-vline 
WA_LIST_COL_C_STR-VALEXI sy-vline 
WA_LIST_COL_C_STR-NOFORKEY sy-vline 
WA_LIST_COL_C_STR-CONVEXIT sy-vline 
WA_LIST_COL_C_STR-OUTPUTLEN sy-vline 
WA_LIST_COL_C_STR-HEADLEN sy-vline 
WA_LIST_COL_C_STR-SCRLEN1 sy-vline 
WA_LIST_COL_C_STR-SCRLEN2 sy-vline 
WA_LIST_COL_C_STR-SCRLEN3 sy-vline 
WA_LIST_COL_C_STR-REPTEXT sy-vline 
WA_LIST_COL_C_STR-SCRTEXT_S sy-vline 
WA_LIST_COL_C_STR-SCRTEXT_M sy-vline 
WA_LIST_COL_C_STR-SCRTEXT_L sy-vline 
WA_LIST_COL_C_STR-MASK sy-vline 
WA_LIST_COL_C_STR-IMPORTANCE sy-vline 
WA_LIST_COL_C_STR-POS_START sy-vline 
WA_LIST_COL_C_STR-POS_VLINE sy-vline 
WA_LIST_COL_C_STR-WIDTH sy-vline 
WA_LIST_COL_C_STR-EXT_ACTION sy-vline 
WA_LIST_COL_C_STR-PRIORITY sy-vline 
WA_LIST_COL_C_STR-COLOR sy-vline 
WA_LIST_COL_C_STR-INPUT sy-vline 
WA_LIST_COL_C_STR-INVERS sy-vline 
WA_LIST_COL_C_STR-INTENS sy-vline 
WA_LIST_COL_C_STR-SCROLL_TYP sy-vline 
WA_LIST_COL_C_STR-COL_TYPE sy-vline 
WA_LIST_COL_C_STR-POWER_TEN sy-vline 
WA_LIST_COL_C_STR-HIDE sy-vline 
WA_LIST_COL_C_STR-EXIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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