ABAP Select data from SAP table /AIF/CCUSTLINK into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP /AIF/CCUSTLINK 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 /AIF/CCUSTLINK. 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 /AIF/CCUSTLINK 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_/AIF/CCUSTLINK TYPE STANDARD TABLE OF /AIF/CCUSTLINK,
      WA_/AIF/CCUSTLINK TYPE /AIF/CCUSTLINK,
      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: </AIF/CCUSTLINK> TYPE /AIF/CCUSTLINK.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /AIF/CCUSTLINK
  INTO TABLE IT_/AIF/CCUSTLINK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /AIF/CCUSTLINK
*  INTO TABLE @DATA(IT_/AIF/CCUSTLINK2).
*--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_/AIF/CCUSTLINK INDEX 1 INTO DATA(WA_/AIF/CCUSTLINK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/AIF/CCUSTLINK ASSIGNING </AIF/CCUSTLINK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</AIF/CCUSTLINK>-MANDT = 1.
</AIF/CCUSTLINK>-NAMESPACE = 1.
</AIF/CCUSTLINK>-INTERFACENAME = 1.
</AIF/CCUSTLINK>-INTERFACEVERSION = 1.
</AIF/CCUSTLINK>-LINKID = 1.

ENDLOOP.

LOOP AT IT_/AIF/CCUSTLINK INTO WA_/AIF/CCUSTLINK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/AIF/CCUSTLINK-AUTHORIZEDUSER, sy-vline,
  WA_/AIF/CCUSTLINK-MESSAGEID, sy-vline,
  WA_/AIF/CCUSTLINK-MESSAGENO, sy-vline,
  WA_/AIF/CCUSTLINK-LOGICALSYSTEM, sy-vline,
  WA_/AIF/CCUSTLINK-VISIBILITY, sy-vline,
  WA_/AIF/CCUSTLINK-SCOPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/AIF/CCUSTLINK 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_/AIF/CCUSTLINK 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_/AIF/CCUSTLINK INTO WA_/AIF/CCUSTLINK.


*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 LOGICALSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/AIF/CCUSTLINK-LOGICALSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/AIF/CCUSTLINK-LOGICALSYSTEM.
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_/AIF/CCUSTLINK_STR, 
MANDT TYPE STRING,
NAMESPACE TYPE STRING,
INTERFACENAME TYPE STRING,
INTERFACEVERSION TYPE STRING,
LINKID TYPE STRING,
AUTHORIZEDUSER TYPE STRING,
MESSAGEID TYPE STRING,
MESSAGENO TYPE STRING,
LOGICALSYSTEM TYPE STRING,
VISIBILITY TYPE STRING,
SCOPE TYPE STRING,
CREATEUSER TYPE STRING,
CREATEDATE TYPE STRING,
CREATETIME TYPE STRING,
LASTUSER TYPE STRING,
LASTDATE TYPE STRING,
LASTTIME TYPE STRING,
RECORDTYPE TYPE STRING,
RECORDTYPENUMBER TYPE STRING,
GLOBALROWNUMBER TYPE STRING,
FIELDNAME TYPE STRING,
LOGHANDLE TYPE STRING,
MESSAGESERIALNUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/AIF/CCUSTLINK_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_/AIF/CCUSTLINK_STR-MANDT sy-vline 
WA_/AIF/CCUSTLINK_STR-NAMESPACE sy-vline 
WA_/AIF/CCUSTLINK_STR-INTERFACENAME sy-vline 
WA_/AIF/CCUSTLINK_STR-INTERFACEVERSION sy-vline 
WA_/AIF/CCUSTLINK_STR-LINKID sy-vline 
WA_/AIF/CCUSTLINK_STR-AUTHORIZEDUSER sy-vline 
WA_/AIF/CCUSTLINK_STR-MESSAGEID sy-vline 
WA_/AIF/CCUSTLINK_STR-MESSAGENO sy-vline 
WA_/AIF/CCUSTLINK_STR-LOGICALSYSTEM sy-vline 
WA_/AIF/CCUSTLINK_STR-VISIBILITY sy-vline 
WA_/AIF/CCUSTLINK_STR-SCOPE sy-vline 
WA_/AIF/CCUSTLINK_STR-CREATEUSER sy-vline 
WA_/AIF/CCUSTLINK_STR-CREATEDATE sy-vline 
WA_/AIF/CCUSTLINK_STR-CREATETIME sy-vline 
WA_/AIF/CCUSTLINK_STR-LASTUSER sy-vline 
WA_/AIF/CCUSTLINK_STR-LASTDATE sy-vline 
WA_/AIF/CCUSTLINK_STR-LASTTIME sy-vline 
WA_/AIF/CCUSTLINK_STR-RECORDTYPE sy-vline 
WA_/AIF/CCUSTLINK_STR-RECORDTYPENUMBER sy-vline 
WA_/AIF/CCUSTLINK_STR-GLOBALROWNUMBER sy-vline 
WA_/AIF/CCUSTLINK_STR-FIELDNAME sy-vline 
WA_/AIF/CCUSTLINK_STR-LOGHANDLE sy-vline 
WA_/AIF/CCUSTLINK_STR-MESSAGESERIALNUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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