ABAP Select data from SAP table T74AB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T74AB 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 T74AB. 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 T74AB 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_T74AB TYPE STANDARD TABLE OF T74AB,
      WA_T74AB TYPE T74AB,
      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: <T74AB> TYPE T74AB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T74AB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T74AB
  INTO TABLE IT_T74AB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T74AB
*  INTO TABLE @DATA(IT_T74AB2).
*--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_T74AB INDEX 1 INTO DATA(WA_T74AB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T74AB ASSIGNING <T74AB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T74AB>-MANDT = 1.
<T74AB>-PERNR = 1.
<T74AB>-DSUBT = 1.
<T74AB>-DOBJP = 1.
<T74AB>-SUBTY = 1.

ENDLOOP.

LOOP AT IT_T74AB INTO WA_T74AB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T74AB-OBJPS, sy-vline,
  WA_T74AB-FAVOR, sy-vline,
  WA_T74AB-FANAM, sy-vline,
  WA_T74AB-FASEX, sy-vline,
  WA_T74AB-FGBDT, sy-vline,
  WA_T74AB-PERID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T74AB 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_T74AB 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_T74AB INTO WA_T74AB.


*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.

*Conversion exit PDATE, internal->external for field FGBDT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_T74AB-FGBDT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T74AB-FGBDT.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_T74AB_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
DSUBT TYPE STRING,
DOBJP TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
FAVOR TYPE STRING,
FANAM TYPE STRING,
FASEX TYPE STRING,
FGBDT TYPE STRING,
PERID TYPE STRING,
OWNCR TYPE STRING,
NONTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T74AB_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_T74AB_STR-MANDT sy-vline 
WA_T74AB_STR-PERNR sy-vline 
WA_T74AB_STR-DSUBT sy-vline 
WA_T74AB_STR-DOBJP sy-vline 
WA_T74AB_STR-SUBTY sy-vline 
WA_T74AB_STR-OBJPS sy-vline 
WA_T74AB_STR-FAVOR sy-vline 
WA_T74AB_STR-FANAM sy-vline 
WA_T74AB_STR-FASEX sy-vline 
WA_T74AB_STR-FGBDT sy-vline 
WA_T74AB_STR-PERID sy-vline 
WA_T74AB_STR-OWNCR sy-vline 
WA_T74AB_STR-NONTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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