ABAP Select data from SAP table CACNS_CU_HIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CACNS_CU_HIST
*  INTO TABLE @DATA(IT_CACNS_CU_HIST2).
*--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_CACNS_CU_HIST INDEX 1 INTO DATA(WA_CACNS_CU_HIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CACNS_CU_HIST>-MANDT = 1.
<CACNS_CU_HIST>-KUNNR = 1.
<CACNS_CU_HIST>-PROJECTNR = 1.
<CACNS_CU_HIST>-KUNNAME = 1.
<CACNS_CU_HIST>-PROJNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CACNS_CU_HIST-RESPONSIBLE, sy-vline,
  WA_CACNS_CU_HIST-FROMDATE, sy-vline,
  WA_CACNS_CU_HIST-TODATE, sy-vline,
  WA_CACNS_CU_HIST-AREA, sy-vline,
  WA_CACNS_CU_HIST-SOURCE, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_CACNS_CU_HIST 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_CACNS_CU_HIST 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_CACNS_CU_HIST INTO WA_CACNS_CU_HIST.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CACNS_CU_HIST-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CACNS_CU_HIST-KUNNR.
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_CACNS_CU_HIST_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
PROJECTNR TYPE STRING,
KUNNAME TYPE STRING,
PROJNAME TYPE STRING,
RESPONSIBLE TYPE STRING,
FROMDATE TYPE STRING,
TODATE TYPE STRING,
AREA TYPE STRING,
SOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CACNS_CU_HIST_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_CACNS_CU_HIST_STR-MANDT sy-vline 
WA_CACNS_CU_HIST_STR-KUNNR sy-vline 
WA_CACNS_CU_HIST_STR-PROJECTNR sy-vline 
WA_CACNS_CU_HIST_STR-KUNNAME sy-vline 
WA_CACNS_CU_HIST_STR-PROJNAME sy-vline 
WA_CACNS_CU_HIST_STR-RESPONSIBLE sy-vline 
WA_CACNS_CU_HIST_STR-FROMDATE sy-vline 
WA_CACNS_CU_HIST_STR-TODATE sy-vline 
WA_CACNS_CU_HIST_STR-AREA sy-vline 
WA_CACNS_CU_HIST_STR-SOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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