ABAP Select data from SAP table P778AT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P778AT 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 P778AT. 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 P778AT 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_P778AT TYPE STANDARD TABLE OF P778AT,
      WA_P778AT TYPE P778AT,
      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: <P778AT> TYPE P778AT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P778AT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P778AT
  INTO TABLE IT_P778AT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P778AT
*  INTO TABLE @DATA(IT_P778AT2).
*--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_P778AT INDEX 1 INTO DATA(WA_P778AT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P778AT ASSIGNING <P778AT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P778AT>-ATEXT = 1.
<P778AT>-ACTION = 1.
<P778AT>-PAGENO = 1.
<P778AT>-TOTAL = 1.
<P778AT>-WEGID = 1.

ENDLOOP.

LOOP AT IT_P778AT INTO WA_P778AT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P778AT-WEGNR, sy-vline,
  WA_P778AT-OTYPE, sy-vline,
  WA_P778AT-RSIGN, sy-vline,
  WA_P778AT-RELAT, sy-vline,
  WA_P778AT-PRIOX, sy-vline,
  WA_P778AT-SCLAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P778AT 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_P778AT 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_P778AT INTO WA_P778AT.


*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_P778AT_STR, 
ATEXT TYPE STRING,
ACTION TYPE STRING,
PAGENO TYPE STRING,
TOTAL TYPE STRING,
WEGID TYPE STRING,
WEGNR TYPE STRING,
OTYPE TYPE STRING,
RSIGN TYPE STRING,
RELAT TYPE STRING,
PRIOX TYPE STRING,
SCLAS TYPE STRING,
SKIPF TYPE STRING,
CLAS1 TYPE STRING,
CLAS2 TYPE STRING,
NWEGID TYPE STRING,
CPACTION TYPE STRING,
SOURCE TYPE STRING,
TARGET TYPE STRING,
UNAME TYPE STRING,
AEDTM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P778AT_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_P778AT_STR-ATEXT sy-vline 
WA_P778AT_STR-ACTION sy-vline 
WA_P778AT_STR-PAGENO sy-vline 
WA_P778AT_STR-TOTAL sy-vline 
WA_P778AT_STR-WEGID sy-vline 
WA_P778AT_STR-WEGNR sy-vline 
WA_P778AT_STR-OTYPE sy-vline 
WA_P778AT_STR-RSIGN sy-vline 
WA_P778AT_STR-RELAT sy-vline 
WA_P778AT_STR-PRIOX sy-vline 
WA_P778AT_STR-SCLAS sy-vline 
WA_P778AT_STR-SKIPF sy-vline 
WA_P778AT_STR-CLAS1 sy-vline 
WA_P778AT_STR-CLAS2 sy-vline 
WA_P778AT_STR-NWEGID sy-vline 
WA_P778AT_STR-CPACTION sy-vline 
WA_P778AT_STR-SOURCE sy-vline 
WA_P778AT_STR-TARGET sy-vline 
WA_P778AT_STR-UNAME sy-vline 
WA_P778AT_STR-AEDTM sy-vline      INTO ld_text SEPARATED BY SPACE.

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