ABAP Select data from SAP table T7CN3F into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7CN3F 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 T7CN3F. 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 T7CN3F 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_T7CN3F TYPE STANDARD TABLE OF T7CN3F,
      WA_T7CN3F TYPE T7CN3F,
      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: <T7CN3F> TYPE T7CN3F.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7CN3F.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7CN3F
  INTO TABLE IT_T7CN3F.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7CN3F
*  INTO TABLE @DATA(IT_T7CN3F2).
*--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_T7CN3F INDEX 1 INTO DATA(WA_T7CN3F2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7CN3F ASSIGNING <T7CN3F>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7CN3F>-MANDT = 1.
<T7CN3F>-PERNR = 1.
<T7CN3F>-SEQNR = 1.
<T7CN3F>-INTYP = 1.
<T7CN3F>-ABKRS = 1.

ENDLOOP.

LOOP AT IT_T7CN3F INTO WA_T7CN3F.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7CN3F-FPPER, sy-vline,
  WA_T7CN3F-IPEND, sy-vline,
  WA_T7CN3F-REPORTDATE, sy-vline,
  WA_T7CN3F-CNAME, sy-vline,
  WA_T7CN3F-INNUM, sy-vline,
  WA_T7CN3F-TXARE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7CN3F 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_T7CN3F 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_T7CN3F INTO WA_T7CN3F.


*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_T7CN3F_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
SEQNR TYPE STRING,
INTYP TYPE STRING,
ABKRS TYPE STRING,
FPPER TYPE STRING,
IPEND TYPE STRING,
REPORTDATE TYPE STRING,
CNAME TYPE STRING,
INNUM TYPE STRING,
TXARE TYPE STRING,
TXINC TYPE STRING,
EXPAM TYPE STRING,
TXPCT TYPE STRING,
TXACC TYPE STRING,
TXAMT TYPE STRING,
ZXAMT TYPE STRING,
ZXAMT_C TYPE STRING,
ZXAMT_P TYPE STRING,
TXIN2 TYPE STRING,
INCTP TYPE STRING,
BALANCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7CN3F_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_T7CN3F_STR-MANDT sy-vline 
WA_T7CN3F_STR-PERNR sy-vline 
WA_T7CN3F_STR-SEQNR sy-vline 
WA_T7CN3F_STR-INTYP sy-vline 
WA_T7CN3F_STR-ABKRS sy-vline 
WA_T7CN3F_STR-FPPER sy-vline 
WA_T7CN3F_STR-IPEND sy-vline 
WA_T7CN3F_STR-REPORTDATE sy-vline 
WA_T7CN3F_STR-CNAME sy-vline 
WA_T7CN3F_STR-INNUM sy-vline 
WA_T7CN3F_STR-TXARE sy-vline 
WA_T7CN3F_STR-TXINC sy-vline 
WA_T7CN3F_STR-EXPAM sy-vline 
WA_T7CN3F_STR-TXPCT sy-vline 
WA_T7CN3F_STR-TXACC sy-vline 
WA_T7CN3F_STR-TXAMT sy-vline 
WA_T7CN3F_STR-ZXAMT sy-vline 
WA_T7CN3F_STR-ZXAMT_C sy-vline 
WA_T7CN3F_STR-ZXAMT_P sy-vline 
WA_T7CN3F_STR-TXIN2 sy-vline 
WA_T7CN3F_STR-INCTP sy-vline 
WA_T7CN3F_STR-BALANCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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