ABAP Select data from SAP table CLA_CH_AT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLA_CH_AT
*  INTO TABLE @DATA(IT_CLA_CH_AT2).
*--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_CLA_CH_AT INDEX 1 INTO DATA(WA_CLA_CH_AT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLA_CH_AT>-CHARACT = 1.
<CLA_CH_AT>-DESCR = 1.
<CLA_CH_AT>-ENTRY_REQ = 1.
<CLA_CH_AT>-INTERV = 1.
<CLA_CH_AT>-UNFORMATED = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLA_CH_AT-PROP_TEMPL, sy-vline,
  WA_CLA_CH_AT-DISPL_VALS, sy-vline,
  WA_CLA_CH_AT-ADDIT_VALS, sy-vline,
  WA_CLA_CH_AT-DOCUMENT, sy-vline,
  WA_CLA_CH_AT-DOC_TYPE, sy-vline,
  WA_CLA_CH_AT-DOC_PART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLA_CH_AT 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_CLA_CH_AT 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_CLA_CH_AT INTO WA_CLA_CH_AT.


*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_CLA_CH_AT-DOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLA_CH_AT-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_CLA_CH_AT_STR, 
CHARACT TYPE STRING,
DESCR 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,
CLASS TYPE STRING,
CLASS_TYPE TYPE STRING,
CH_OVRWRT TYPE STRING,
VAL_OVRWRT TYPE STRING,
ORG_AREA TYPE STRING,
NO_DISPLAY TYPE STRING,
CODE_LETTER TYPE STRING,
CHARACT_ORIGIN TYPE STRING,
PRINT_RELEV TYPE STRING,
SELECT_RELEV TYPE STRING,
DISPLAY_RELEV TYPE STRING,
INHERITED TYPE STRING,
INDEX_RELEV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLA_CH_AT_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_CLA_CH_AT_STR-CHARACT sy-vline 
WA_CLA_CH_AT_STR-DESCR sy-vline 
WA_CLA_CH_AT_STR-ENTRY_REQ sy-vline 
WA_CLA_CH_AT_STR-INTERV sy-vline 
WA_CLA_CH_AT_STR-UNFORMATED sy-vline 
WA_CLA_CH_AT_STR-PROP_TEMPL sy-vline 
WA_CLA_CH_AT_STR-DISPL_VALS sy-vline 
WA_CLA_CH_AT_STR-ADDIT_VALS sy-vline 
WA_CLA_CH_AT_STR-DOCUMENT sy-vline 
WA_CLA_CH_AT_STR-DOC_TYPE sy-vline 
WA_CLA_CH_AT_STR-DOC_PART sy-vline 
WA_CLA_CH_AT_STR-DOC_VERS sy-vline 
WA_CLA_CH_AT_STR-CLASS sy-vline 
WA_CLA_CH_AT_STR-CLASS_TYPE sy-vline 
WA_CLA_CH_AT_STR-CH_OVRWRT sy-vline 
WA_CLA_CH_AT_STR-VAL_OVRWRT sy-vline 
WA_CLA_CH_AT_STR-ORG_AREA sy-vline 
WA_CLA_CH_AT_STR-NO_DISPLAY sy-vline 
WA_CLA_CH_AT_STR-CODE_LETTER sy-vline 
WA_CLA_CH_AT_STR-CHARACT_ORIGIN sy-vline 
WA_CLA_CH_AT_STR-PRINT_RELEV sy-vline 
WA_CLA_CH_AT_STR-SELECT_RELEV sy-vline 
WA_CLA_CH_AT_STR-DISPLAY_RELEV sy-vline 
WA_CLA_CH_AT_STR-INHERITED sy-vline 
WA_CLA_CH_AT_STR-INDEX_RELEV sy-vline      INTO ld_text SEPARATED BY SPACE.

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