ABAP Select data from SAP table CHDAT_VIEW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CHDAT_VIEW
*  INTO TABLE @DATA(IT_CHDAT_VIEW2).
*--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_CHDAT_VIEW INDEX 1 INTO DATA(WA_CHDAT_VIEW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CHDAT_VIEW>-CHARACT = 1.
<CHDAT_VIEW>-DESCR = 1.
<CHDAT_VIEW>-DATATYPE = 1.
<CHDAT_VIEW>-UDEF_CLASS = 1.
<CHDAT_VIEW>-CHARNUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CHDAT_VIEW-DECPLACES, sy-vline,
  WA_CHDAT_VIEW-CASESENS, sy-vline,
  WA_CHDAT_VIEW-DISPL_EXP, sy-vline,
  WA_CHDAT_VIEW-EXPONENT, sy-vline,
  WA_CHDAT_VIEW-TEMPLATE, sy-vline,
  WA_CHDAT_VIEW-NEG_VALS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CHDAT_VIEW 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_CHDAT_VIEW 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_CHDAT_VIEW INTO WA_CHDAT_VIEW.


*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 DOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CHDAT_VIEW-DOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CHDAT_VIEW-DOCUMENT.
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_CHDAT_VIEW_STR, 
CHARACT TYPE STRING,
DESCR TYPE STRING,
DATATYPE TYPE STRING,
UDEF_CLASS TYPE STRING,
CHARNUMBER TYPE STRING,
DECPLACES TYPE STRING,
CASESENS TYPE STRING,
DISPL_EXP TYPE STRING,
EXPONENT TYPE STRING,
TEMPLATE TYPE STRING,
NEG_VALS TYPE STRING,
UNIT TYPE STRING,
STATUS TYPE STRING,
GROUP TYPE STRING,
VALASSIGNM TYPE STRING,
NO_ENTRY TYPE STRING,
NO_DISPLAY TYPE STRING,
ENTRY_REQ TYPE STRING,
INTERV TYPE STRING,
UNFORMATED TYPE STRING,
PROP_TEMPL TYPE STRING,
DISPL_VALS TYPE STRING,
ADDIT_VALS TYPE STRING,
DOCUMENT TYPE STRING,
DOC_TYPE TYPE STRING,
DOC_PART TYPE STRING,
DOC_VERS TYPE STRING,
AUTHORITY_GROUP TYPE STRING,
VIEW0 TYPE STRING,
VIEW1 TYPE STRING,
VIEW2 TYPE STRING,
VIEW3 TYPE STRING,
VIEW4 TYPE STRING,
VIEW5 TYPE STRING,
VIEW6 TYPE STRING,
VIEW7 TYPE STRING,
VIEW8 TYPE STRING,
VIEW9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CHDAT_VIEW_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_CHDAT_VIEW_STR-CHARACT sy-vline 
WA_CHDAT_VIEW_STR-DESCR sy-vline 
WA_CHDAT_VIEW_STR-DATATYPE sy-vline 
WA_CHDAT_VIEW_STR-UDEF_CLASS sy-vline 
WA_CHDAT_VIEW_STR-CHARNUMBER sy-vline 
WA_CHDAT_VIEW_STR-DECPLACES sy-vline 
WA_CHDAT_VIEW_STR-CASESENS sy-vline 
WA_CHDAT_VIEW_STR-DISPL_EXP sy-vline 
WA_CHDAT_VIEW_STR-EXPONENT sy-vline 
WA_CHDAT_VIEW_STR-TEMPLATE sy-vline 
WA_CHDAT_VIEW_STR-NEG_VALS sy-vline 
WA_CHDAT_VIEW_STR-UNIT sy-vline 
WA_CHDAT_VIEW_STR-STATUS sy-vline 
WA_CHDAT_VIEW_STR-GROUP sy-vline 
WA_CHDAT_VIEW_STR-VALASSIGNM sy-vline 
WA_CHDAT_VIEW_STR-NO_ENTRY sy-vline 
WA_CHDAT_VIEW_STR-NO_DISPLAY sy-vline 
WA_CHDAT_VIEW_STR-ENTRY_REQ sy-vline 
WA_CHDAT_VIEW_STR-INTERV sy-vline 
WA_CHDAT_VIEW_STR-UNFORMATED sy-vline 
WA_CHDAT_VIEW_STR-PROP_TEMPL sy-vline 
WA_CHDAT_VIEW_STR-DISPL_VALS sy-vline 
WA_CHDAT_VIEW_STR-ADDIT_VALS sy-vline 
WA_CHDAT_VIEW_STR-DOCUMENT sy-vline 
WA_CHDAT_VIEW_STR-DOC_TYPE sy-vline 
WA_CHDAT_VIEW_STR-DOC_PART sy-vline 
WA_CHDAT_VIEW_STR-DOC_VERS sy-vline 
WA_CHDAT_VIEW_STR-AUTHORITY_GROUP sy-vline 
WA_CHDAT_VIEW_STR-VIEW0 sy-vline 
WA_CHDAT_VIEW_STR-VIEW1 sy-vline 
WA_CHDAT_VIEW_STR-VIEW2 sy-vline 
WA_CHDAT_VIEW_STR-VIEW3 sy-vline 
WA_CHDAT_VIEW_STR-VIEW4 sy-vline 
WA_CHDAT_VIEW_STR-VIEW5 sy-vline 
WA_CHDAT_VIEW_STR-VIEW6 sy-vline 
WA_CHDAT_VIEW_STR-VIEW7 sy-vline 
WA_CHDAT_VIEW_STR-VIEW8 sy-vline 
WA_CHDAT_VIEW_STR-VIEW9 sy-vline      INTO ld_text SEPARATED BY SPACE.

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