ABAP Select data from SAP table T7CN20 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7CN20 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 T7CN20. 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 T7CN20 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_T7CN20 TYPE STANDARD TABLE OF T7CN20,
      WA_T7CN20 TYPE T7CN20,
      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: <T7CN20> TYPE T7CN20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7CN20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7CN20
  INTO TABLE IT_T7CN20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7CN20
*  INTO TABLE @DATA(IT_T7CN202).
*--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_T7CN20 INDEX 1 INTO DATA(WA_T7CN202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7CN20 ASSIGNING <T7CN20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7CN20>-MANDT = 1.
<T7CN20>-INFTY = 1.
<T7CN20>-INTYP = 1.
<T7CN20>-CONBR = 1.
<T7CN20>-CONAR = 1.

ENDLOOP.

LOOP AT IT_T7CN20 INTO WA_T7CN20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7CN20-CONGR, sy-vline,
  WA_T7CN20-CONLV, sy-vline,
  WA_T7CN20-ENDDA, sy-vline,
  WA_T7CN20-PASSR, sy-vline,
  WA_T7CN20-BEGDA, sy-vline,
  WA_T7CN20-EEIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7CN20 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_T7CN20 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_T7CN20 INTO WA_T7CN20.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_T7CN20_STR, 
MANDT TYPE STRING,
INFTY TYPE STRING,
INTYP TYPE STRING,
CONBR TYPE STRING,
CONAR TYPE STRING,
CONGR TYPE STRING,
CONLV TYPE STRING,
ENDDA TYPE STRING,
PASSR TYPE STRING,
BEGDA TYPE STRING,
EEIND TYPE STRING,
EERAT TYPE STRING,
EECON TYPE STRING,
ECCUR TYPE STRING,
EELOW TYPE STRING,
EELCU TYPE STRING,
EEHIG TYPE STRING,
EEHCU TYPE STRING,
ERIND TYPE STRING,
ERRAT TYPE STRING,
ERCON TYPE STRING,
RCCUR TYPE STRING,
ERLOW TYPE STRING,
ERLCU TYPE STRING,
ERHIG TYPE STRING,
ERHCU TYPE STRING,
EEBSR TYPE STRING,
EECOR TYPE STRING,
EEWGE TYPE STRING,
ERBSR TYPE STRING,
ERCOR TYPE STRING,
ERWGE TYPE STRING,
ERDIF TYPE STRING,
EMRAT TYPE STRING,
EMMTP TYPE STRING,
EMAVG TYPE STRING,
EXMTH TYPE STRING,
EEAHI TYPE STRING,
EEAHC TYPE STRING,
ERAHI TYPE STRING,
ERAHC TYPE STRING,
EEALO TYPE STRING,
EEALC TYPE STRING,
ERALO TYPE STRING,
ERALC TYPE STRING,
CFRQC TYPE STRING,
FCMTH TYPE STRING,
PRORU TYPE STRING,
EXBSR TYPE STRING,
EXCOR TYPE STRING,
MOSEL TYPE STRING,
EEEMP TYPE STRING,
EEECU TYPE STRING,
EREMP TYPE STRING,
ERECU TYPE STRING,
EXMPT_RATE_EE TYPE STRING,
EXMPT_RATE_ER TYPE STRING,
DIFF_EXMPT_EE_ER TYPE STRING,
CIFLG TYPE STRING,
CFRQI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7CN20_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_T7CN20_STR-MANDT sy-vline 
WA_T7CN20_STR-INFTY sy-vline 
WA_T7CN20_STR-INTYP sy-vline 
WA_T7CN20_STR-CONBR sy-vline 
WA_T7CN20_STR-CONAR sy-vline 
WA_T7CN20_STR-CONGR sy-vline 
WA_T7CN20_STR-CONLV sy-vline 
WA_T7CN20_STR-ENDDA sy-vline 
WA_T7CN20_STR-PASSR sy-vline 
WA_T7CN20_STR-BEGDA sy-vline 
WA_T7CN20_STR-EEIND sy-vline 
WA_T7CN20_STR-EERAT sy-vline 
WA_T7CN20_STR-EECON sy-vline 
WA_T7CN20_STR-ECCUR sy-vline 
WA_T7CN20_STR-EELOW sy-vline 
WA_T7CN20_STR-EELCU sy-vline 
WA_T7CN20_STR-EEHIG sy-vline 
WA_T7CN20_STR-EEHCU sy-vline 
WA_T7CN20_STR-ERIND sy-vline 
WA_T7CN20_STR-ERRAT sy-vline 
WA_T7CN20_STR-ERCON sy-vline 
WA_T7CN20_STR-RCCUR sy-vline 
WA_T7CN20_STR-ERLOW sy-vline 
WA_T7CN20_STR-ERLCU sy-vline 
WA_T7CN20_STR-ERHIG sy-vline 
WA_T7CN20_STR-ERHCU sy-vline 
WA_T7CN20_STR-EEBSR sy-vline 
WA_T7CN20_STR-EECOR sy-vline 
WA_T7CN20_STR-EEWGE sy-vline 
WA_T7CN20_STR-ERBSR sy-vline 
WA_T7CN20_STR-ERCOR sy-vline 
WA_T7CN20_STR-ERWGE sy-vline 
WA_T7CN20_STR-ERDIF sy-vline 
WA_T7CN20_STR-EMRAT sy-vline 
WA_T7CN20_STR-EMMTP sy-vline 
WA_T7CN20_STR-EMAVG sy-vline 
WA_T7CN20_STR-EXMTH sy-vline 
WA_T7CN20_STR-EEAHI sy-vline 
WA_T7CN20_STR-EEAHC sy-vline 
WA_T7CN20_STR-ERAHI sy-vline 
WA_T7CN20_STR-ERAHC sy-vline 
WA_T7CN20_STR-EEALO sy-vline 
WA_T7CN20_STR-EEALC sy-vline 
WA_T7CN20_STR-ERALO sy-vline 
WA_T7CN20_STR-ERALC sy-vline 
WA_T7CN20_STR-CFRQC sy-vline 
WA_T7CN20_STR-FCMTH sy-vline 
WA_T7CN20_STR-PRORU sy-vline 
WA_T7CN20_STR-EXBSR sy-vline 
WA_T7CN20_STR-EXCOR sy-vline 
WA_T7CN20_STR-MOSEL sy-vline 
WA_T7CN20_STR-EEEMP sy-vline 
WA_T7CN20_STR-EEECU sy-vline 
WA_T7CN20_STR-EREMP sy-vline 
WA_T7CN20_STR-ERECU sy-vline 
WA_T7CN20_STR-EXMPT_RATE_EE sy-vline 
WA_T7CN20_STR-EXMPT_RATE_ER sy-vline 
WA_T7CN20_STR-DIFF_EXMPT_EE_ER sy-vline 
WA_T7CN20_STR-CIFLG sy-vline 
WA_T7CN20_STR-CFRQI sy-vline      INTO ld_text SEPARATED BY SPACE.

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