ABAP Select data from SAP table T804A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T804A 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 T804A. 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 T804A 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_T804A TYPE STANDARD TABLE OF T804A,
      WA_T804A TYPE T804A,
      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: <T804A> TYPE T804A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T804A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T804A
  INTO TABLE IT_T804A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T804A
*  INTO TABLE @DATA(IT_T804A2).
*--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_T804A INDEX 1 INTO DATA(WA_T804A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T804A ASSIGNING <T804A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T804A>-TAB = 1.
<T804A>-TFORM = 1.
<T804A>-MPOOL = 1.
<T804A>-TDATE = 1.
<T804A>-FLD01 = 1.

ENDLOOP.

LOOP AT IT_T804A INTO WA_T804A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T804A-FLD02, sy-vline,
  WA_T804A-FLD03, sy-vline,
  WA_T804A-FLD04, sy-vline,
  WA_T804A-FLD05, sy-vline,
  WA_T804A-ADDTT, sy-vline,
  WA_T804A-FILLR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T804A 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_T804A 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_T804A INTO WA_T804A.


*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_T804A_STR, 
TAB TYPE STRING,
TFORM TYPE STRING,
MPOOL TYPE STRING,
TDATE TYPE STRING,
FLD01 TYPE STRING,
FLD02 TYPE STRING,
FLD03 TYPE STRING,
FLD04 TYPE STRING,
FLD05 TYPE STRING,
ADDTT TYPE STRING,
FILLR TYPE STRING,
FCLAS TYPE STRING,
OTABL TYPE STRING,
TTYPE TYPE STRING,
CH_EXIT TYPE STRING,
DBASE TYPE STRING,
APPL TYPE STRING,
OFF_FIELD TYPE STRING,
TEXT_TABLE TYPE STRING,
AUTHR TYPE STRING,
MAX_OUT2 TYPE STRING,
MAX_SUM TYPE STRING,
ARCHREAD TYPE STRING,
SELSCREEN_STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T804A_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_T804A_STR-TAB sy-vline 
WA_T804A_STR-TFORM sy-vline 
WA_T804A_STR-MPOOL sy-vline 
WA_T804A_STR-TDATE sy-vline 
WA_T804A_STR-FLD01 sy-vline 
WA_T804A_STR-FLD02 sy-vline 
WA_T804A_STR-FLD03 sy-vline 
WA_T804A_STR-FLD04 sy-vline 
WA_T804A_STR-FLD05 sy-vline 
WA_T804A_STR-ADDTT sy-vline 
WA_T804A_STR-FILLR sy-vline 
WA_T804A_STR-FCLAS sy-vline 
WA_T804A_STR-OTABL sy-vline 
WA_T804A_STR-TTYPE sy-vline 
WA_T804A_STR-CH_EXIT sy-vline 
WA_T804A_STR-DBASE sy-vline 
WA_T804A_STR-APPL sy-vline 
WA_T804A_STR-OFF_FIELD sy-vline 
WA_T804A_STR-TEXT_TABLE sy-vline 
WA_T804A_STR-AUTHR sy-vline 
WA_T804A_STR-MAX_OUT2 sy-vline 
WA_T804A_STR-MAX_SUM sy-vline 
WA_T804A_STR-ARCHREAD sy-vline 
WA_T804A_STR-SELSCREEN_STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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