ABAP Select data from SAP table T7NZLC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7NZLC 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 T7NZLC. 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 T7NZLC 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_T7NZLC TYPE STANDARD TABLE OF T7NZLC,
      WA_T7NZLC TYPE T7NZLC,
      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: <T7NZLC> TYPE T7NZLC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7NZLC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7NZLC
  INTO TABLE IT_T7NZLC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7NZLC
*  INTO TABLE @DATA(IT_T7NZLC2).
*--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_T7NZLC INDEX 1 INTO DATA(WA_T7NZLC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7NZLC ASSIGNING <T7NZLC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7NZLC>-MANDT = 1.
<T7NZLC>-MOLGA = 1.
<T7NZLC>-MOPGK = 1.
<T7NZLC>-MOZKO = 1.
<T7NZLC>-KTART = 1.

ENDLOOP.

LOOP AT IT_T7NZLC INTO WA_T7NZLC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7NZLC-ENDDA, sy-vline,
  WA_T7NZLC-BEGDA, sy-vline,
  WA_T7NZLC-INTNR, sy-vline,
  WA_T7NZLC-RATET, sy-vline,
  WA_T7NZLC-ADJWT, sy-vline,
  WA_T7NZLC-PSHUT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7NZLC 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_T7NZLC 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_T7NZLC INTO WA_T7NZLC.


*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_T7NZLC_STR, 
MANDT TYPE STRING,
MOLGA TYPE STRING,
MOPGK TYPE STRING,
MOZKO TYPE STRING,
KTART TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
INTNR TYPE STRING,
RATET TYPE STRING,
ADJWT TYPE STRING,
PSHUT TYPE STRING,
PERC1 TYPE STRING,
PCABW TYPE STRING,
CABWT TYPE STRING,
GEAWT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7NZLC_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_T7NZLC_STR-MANDT sy-vline 
WA_T7NZLC_STR-MOLGA sy-vline 
WA_T7NZLC_STR-MOPGK sy-vline 
WA_T7NZLC_STR-MOZKO sy-vline 
WA_T7NZLC_STR-KTART sy-vline 
WA_T7NZLC_STR-ENDDA sy-vline 
WA_T7NZLC_STR-BEGDA sy-vline 
WA_T7NZLC_STR-INTNR sy-vline 
WA_T7NZLC_STR-RATET sy-vline 
WA_T7NZLC_STR-ADJWT sy-vline 
WA_T7NZLC_STR-PSHUT sy-vline 
WA_T7NZLC_STR-PERC1 sy-vline 
WA_T7NZLC_STR-PCABW sy-vline 
WA_T7NZLC_STR-CABWT sy-vline 
WA_T7NZLC_STR-GEAWT sy-vline      INTO ld_text SEPARATED BY SPACE.

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