ABAP Select data from SAP table API_CLCH_C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP API_CLCH_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 API_CLCH_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 API_CLCH_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_API_CLCH_C TYPE STANDARD TABLE OF API_CLCH_C,
      WA_API_CLCH_C TYPE API_CLCH_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: <API_CLCH_C> TYPE API_CLCH_C.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM API_CLCH_C
*  INTO TABLE @DATA(IT_API_CLCH_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_API_CLCH_C INDEX 1 INTO DATA(WA_API_CLCH_C2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<API_CLCH_C>-CLASS = 1.
<API_CLCH_C>-CL_TYPE = 1.
<API_CLCH_C>-CHARACT = 1.
<API_CLCH_C>-ORG_AREA = 1.
<API_CLCH_C>-CODE_LETTR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_API_CLCH_C-ORIGIN, sy-vline,
  WA_API_CLCH_C-ATERF, sy-vline,
  WA_API_CLCH_C-ATEIN, sy-vline,
  WA_API_CLCH_C-ATINT, sy-vline,
  WA_API_CLCH_C-ATFOD, sy-vline,
  WA_API_CLCH_C-ATVSC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_API_CLCH_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_API_CLCH_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_API_CLCH_C INTO WA_API_CLCH_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 ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_API_CLCH_C-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_CLCH_C-DOKNR.
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_API_CLCH_C_STR, 
CLASS TYPE STRING,
CL_TYPE TYPE STRING,
CHARACT TYPE STRING,
ORG_AREA TYPE STRING,
CODE_LETTR TYPE STRING,
ORIGIN TYPE STRING,
ATERF TYPE STRING,
ATEIN TYPE STRING,
ATINT TYPE STRING,
ATFOD TYPE STRING,
ATVSC TYPE STRING,
ATWRD TYPE STRING,
ATSON TYPE STRING,
DOKNR TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
FLDELET TYPE STRING,END OF T_EKKO_STR.
DATA: WA_API_CLCH_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_API_CLCH_C_STR-CLASS sy-vline 
WA_API_CLCH_C_STR-CL_TYPE sy-vline 
WA_API_CLCH_C_STR-CHARACT sy-vline 
WA_API_CLCH_C_STR-ORG_AREA sy-vline 
WA_API_CLCH_C_STR-CODE_LETTR sy-vline 
WA_API_CLCH_C_STR-ORIGIN sy-vline 
WA_API_CLCH_C_STR-ATERF sy-vline 
WA_API_CLCH_C_STR-ATEIN sy-vline 
WA_API_CLCH_C_STR-ATINT sy-vline 
WA_API_CLCH_C_STR-ATFOD sy-vline 
WA_API_CLCH_C_STR-ATVSC sy-vline 
WA_API_CLCH_C_STR-ATWRD sy-vline 
WA_API_CLCH_C_STR-ATSON sy-vline 
WA_API_CLCH_C_STR-DOKNR sy-vline 
WA_API_CLCH_C_STR-DOKAR sy-vline 
WA_API_CLCH_C_STR-DOKTL sy-vline 
WA_API_CLCH_C_STR-DOKVR sy-vline 
WA_API_CLCH_C_STR-FLDELET sy-vline      INTO ld_text SEPARATED BY SPACE.

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