ABAP Select data from SAP table T802G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T802G 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 T802G. 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 T802G 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_T802G TYPE STANDARD TABLE OF T802G,
      WA_T802G TYPE T802G,
      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: <T802G> TYPE T802G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T802G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T802G
  INTO TABLE IT_T802G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T802G
*  INTO TABLE @DATA(IT_T802G2).
*--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_T802G INDEX 1 INTO DATA(WA_T802G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T802G ASSIGNING <T802G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T802G>-MANDT = 1.
<T802G>-GLOBAL = 1.
<T802G>-TAB = 1.
<T802G>-FELD = 1.
<T802G>-VALUE = 1.

ENDLOOP.

LOOP AT IT_T802G INTO WA_T802G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T802G-GTYPE, sy-vline,
  WA_T802G-CRNAME, sy-vline,
  WA_T802G-CRDAT, sy-vline,
  WA_T802G-CRTIME, sy-vline,
  WA_T802G-UPNAME, sy-vline,
  WA_T802G-UPDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T802G 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_T802G 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_T802G INTO WA_T802G.


*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_T802G_STR, 
MANDT TYPE STRING,
GLOBAL TYPE STRING,
TAB TYPE STRING,
FELD TYPE STRING,
VALUE TYPE STRING,
GTYPE TYPE STRING,
CRNAME TYPE STRING,
CRDAT TYPE STRING,
CRTIME TYPE STRING,
UPNAME TYPE STRING,
UPDAT TYPE STRING,
UPTIME TYPE STRING,
PARAMID TYPE STRING,
AUTHGR TYPE STRING,
INT_VAR TYPE STRING,
X_FKT TYPE STRING,
FKT TYPE STRING,
DEFSETID TYPE STRING,
ROLLNAME TYPE STRING,
SETCLASS TYPE STRING,
SETSELOPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T802G_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_T802G_STR-MANDT sy-vline 
WA_T802G_STR-GLOBAL sy-vline 
WA_T802G_STR-TAB sy-vline 
WA_T802G_STR-FELD sy-vline 
WA_T802G_STR-VALUE sy-vline 
WA_T802G_STR-GTYPE sy-vline 
WA_T802G_STR-CRNAME sy-vline 
WA_T802G_STR-CRDAT sy-vline 
WA_T802G_STR-CRTIME sy-vline 
WA_T802G_STR-UPNAME sy-vline 
WA_T802G_STR-UPDAT sy-vline 
WA_T802G_STR-UPTIME sy-vline 
WA_T802G_STR-PARAMID sy-vline 
WA_T802G_STR-AUTHGR sy-vline 
WA_T802G_STR-INT_VAR sy-vline 
WA_T802G_STR-X_FKT sy-vline 
WA_T802G_STR-FKT sy-vline 
WA_T802G_STR-DEFSETID sy-vline 
WA_T802G_STR-ROLLNAME sy-vline 
WA_T802G_STR-SETCLASS sy-vline 
WA_T802G_STR-SETSELOPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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