ABAP Select data from SAP table T801G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T801G 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 T801G. 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 T801G 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_T801G TYPE STANDARD TABLE OF T801G,
      WA_T801G TYPE T801G,
      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: <T801G> TYPE T801G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T801G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T801G
  INTO TABLE IT_T801G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T801G
*  INTO TABLE @DATA(IT_T801G2).
*--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_T801G INDEX 1 INTO DATA(WA_T801G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T801G ASSIGNING <T801G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T801G>-MANDT = 1.
<T801G>-LIB = 1.
<T801G>-RNAME = 1.
<T801G>-SEQNR = 1.
<T801G>-REP_LAYOUT = 1.

ENDLOOP.

LOOP AT IT_T801G INTO WA_T801G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T801G-PFEED, sy-vline,
  WA_T801G-PRE_SIGN, sy-vline,
  WA_T801G-SUF_SIGN, sy-vline,
  WA_T801G-PRINT_HEAD_TOP, sy-vline,
  WA_T801G-PRINT_HEAD_MOP, sy-vline,
  WA_T801G-TROP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T801G 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_T801G 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_T801G INTO WA_T801G.


*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_T801G_STR, 
MANDT TYPE STRING,
LIB TYPE STRING,
RNAME TYPE STRING,
SEQNR TYPE STRING,
REP_LAYOUT TYPE STRING,
PFEED TYPE STRING,
PRE_SIGN TYPE STRING,
SUF_SIGN TYPE STRING,
PRINT_HEAD_TOP TYPE STRING,
PRINT_HEAD_MOP TYPE STRING,
TROP TYPE STRING,
TRFLG TYPE STRING,
TRCOL TYPE STRING,
TRMOD TYPE STRING,
TROPR TYPE STRING,
TRVAL TYPE STRING,
TRSGN TYPE STRING,
TRDET TYPE STRING,
TRFLG2 TYPE STRING,
TRCOL2 TYPE STRING,
TRMOD2 TYPE STRING,
TROPR2 TYPE STRING,
TRVAL2 TYPE STRING,
TRSGN2 TYPE STRING,
TRDET2 TYPE STRING,
SRMOD TYPE STRING,
SRCOL TYPE STRING,
SRLEV TYPE STRING,
SRMODH TYPE STRING,
COLTP TYPE STRING,
COLTX TYPE STRING,
FRMPR TYPE STRING,
GRMRK TYPE STRING,
ROWTX TYPE STRING,
RTITC TYPE STRING,
ROWTX_LG TYPE STRING,
RTITI TYPE STRING,
RTITW TYPE STRING,
SIGN_FLAG TYPE STRING,
SIGN_COL TYPE STRING,
SUM_FROM TYPE STRING,
SUM_TO TYPE STRING,
TFROW TYPE STRING,
TTEXT TYPE STRING,
TTSUP TYPE STRING,
ZSCOL TYPE STRING,
ZSROW TYPE STRING,
TFCOL TYPE STRING,
ROWTX_GR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T801G_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_T801G_STR-MANDT sy-vline 
WA_T801G_STR-LIB sy-vline 
WA_T801G_STR-RNAME sy-vline 
WA_T801G_STR-SEQNR sy-vline 
WA_T801G_STR-REP_LAYOUT sy-vline 
WA_T801G_STR-PFEED sy-vline 
WA_T801G_STR-PRE_SIGN sy-vline 
WA_T801G_STR-SUF_SIGN sy-vline 
WA_T801G_STR-PRINT_HEAD_TOP sy-vline 
WA_T801G_STR-PRINT_HEAD_MOP sy-vline 
WA_T801G_STR-TROP sy-vline 
WA_T801G_STR-TRFLG sy-vline 
WA_T801G_STR-TRCOL sy-vline 
WA_T801G_STR-TRMOD sy-vline 
WA_T801G_STR-TROPR sy-vline 
WA_T801G_STR-TRVAL sy-vline 
WA_T801G_STR-TRSGN sy-vline 
WA_T801G_STR-TRDET sy-vline 
WA_T801G_STR-TRFLG2 sy-vline 
WA_T801G_STR-TRCOL2 sy-vline 
WA_T801G_STR-TRMOD2 sy-vline 
WA_T801G_STR-TROPR2 sy-vline 
WA_T801G_STR-TRVAL2 sy-vline 
WA_T801G_STR-TRSGN2 sy-vline 
WA_T801G_STR-TRDET2 sy-vline 
WA_T801G_STR-SRMOD sy-vline 
WA_T801G_STR-SRCOL sy-vline 
WA_T801G_STR-SRLEV sy-vline 
WA_T801G_STR-SRMODH sy-vline 
WA_T801G_STR-COLTP sy-vline 
WA_T801G_STR-COLTX sy-vline 
WA_T801G_STR-FRMPR sy-vline 
WA_T801G_STR-GRMRK sy-vline 
WA_T801G_STR-ROWTX sy-vline 
WA_T801G_STR-RTITC sy-vline 
WA_T801G_STR-ROWTX_LG sy-vline 
WA_T801G_STR-RTITI sy-vline 
WA_T801G_STR-RTITW sy-vline 
WA_T801G_STR-SIGN_FLAG sy-vline 
WA_T801G_STR-SIGN_COL sy-vline 
WA_T801G_STR-SUM_FROM sy-vline 
WA_T801G_STR-SUM_TO sy-vline 
WA_T801G_STR-TFROW sy-vline 
WA_T801G_STR-TTEXT sy-vline 
WA_T801G_STR-TTSUP sy-vline 
WA_T801G_STR-ZSCOL sy-vline 
WA_T801G_STR-ZSROW sy-vline 
WA_T801G_STR-TFCOL sy-vline 
WA_T801G_STR-ROWTX_GR sy-vline      INTO ld_text SEPARATED BY SPACE.

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