ABAP Select data from SAP table TZC37 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TZC37 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 TZC37. 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 TZC37 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_TZC37 TYPE STANDARD TABLE OF TZC37,
      WA_TZC37 TYPE TZC37,
      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: <TZC37> TYPE TZC37.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TZC37.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TZC37
  INTO TABLE IT_TZC37.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TZC37
*  INTO TABLE @DATA(IT_TZC372).
*--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_TZC37 INDEX 1 INTO DATA(WA_TZC372).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TZC37 ASSIGNING <TZC37>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TZC37>-MANDT = 1.
<TZC37>-BUKRS = 1.
<TZC37>-GSART = 1.
<TZC37>-STATU = 1.
<TZC37>-AUSWA = 1.

ENDLOOP.

LOOP AT IT_TZC37 INTO WA_TZC37.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TZC37-BUHAL, sy-vline,
  WA_TZC37-MUSTE, sy-vline,
  WA_TZC37-FREIG, sy-vline,
  WA_TZC37-STARM, sy-vline,
  WA_TZC37-FDUPD, sy-vline,
  WA_TZC37-GENA1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TZC37 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_TZC37 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_TZC37 INTO WA_TZC37.


*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_TZC37_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
GSART TYPE STRING,
STATU TYPE STRING,
AUSWA TYPE STRING,
BUHAL TYPE STRING,
MUSTE TYPE STRING,
FREIG TYPE STRING,
STARM TYPE STRING,
FDUPD TYPE STRING,
GENA1 TYPE STRING,
GENA2 TYPE STRING,
GENB1 TYPE STRING,
GENB2 TYPE STRING,
SBEWART TYPE STRING,
INTEB TYPE STRING,
UNTGRN TYPE STRING,
SCFGEN TYPE STRING,
JAUSW TYPE STRING,
PERIOD_PREARCH TYPE STRING,
AUSWA_B TYPE STRING,
PERIOD_PRE_YEAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TZC37_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_TZC37_STR-MANDT sy-vline 
WA_TZC37_STR-BUKRS sy-vline 
WA_TZC37_STR-GSART sy-vline 
WA_TZC37_STR-STATU sy-vline 
WA_TZC37_STR-AUSWA sy-vline 
WA_TZC37_STR-BUHAL sy-vline 
WA_TZC37_STR-MUSTE sy-vline 
WA_TZC37_STR-FREIG sy-vline 
WA_TZC37_STR-STARM sy-vline 
WA_TZC37_STR-FDUPD sy-vline 
WA_TZC37_STR-GENA1 sy-vline 
WA_TZC37_STR-GENA2 sy-vline 
WA_TZC37_STR-GENB1 sy-vline 
WA_TZC37_STR-GENB2 sy-vline 
WA_TZC37_STR-SBEWART sy-vline 
WA_TZC37_STR-INTEB sy-vline 
WA_TZC37_STR-UNTGRN sy-vline 
WA_TZC37_STR-SCFGEN sy-vline 
WA_TZC37_STR-JAUSW sy-vline 
WA_TZC37_STR-PERIOD_PREARCH sy-vline 
WA_TZC37_STR-AUSWA_B sy-vline 
WA_TZC37_STR-PERIOD_PRE_YEAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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