ABAP Select data from SAP table U_30049 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP U_30049 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 U_30049. 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 U_30049 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_U_30049 TYPE STANDARD TABLE OF U_30049,
      WA_U_30049 TYPE U_30049,
      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: <U_30049> TYPE U_30049.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_U_30049.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM U_30049
  INTO TABLE IT_U_30049.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM U_30049
*  INTO TABLE @DATA(IT_U_300492).
*--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_U_30049 INDEX 1 INTO DATA(WA_U_300492).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_U_30049 ASSIGNING <U_30049>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<U_30049>-MANDT = 1.
<U_30049>-LOGIKZW = 1.
<U_30049>-BIS = 1.
<U_30049>-ZUART = 1.
<U_30049>-LOGIKNR2 = 1.

ENDLOOP.

LOOP AT IT_U_30049 INTO WA_U_30049.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_U_30049-AB, sy-vline,
  WA_U_30049-MESSDRCK, sy-vline,
  WA_U_30049-ABRFAKT, sy-vline,
  WA_U_30049-PROGT, sy-vline,
  WA_U_30049-ATTRIBUT, sy-vline,
  WA_U_30049-ERDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_U_30049 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_U_30049 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_U_30049 INTO WA_U_30049.


*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_U_30049_STR, 
MANDT TYPE STRING,
LOGIKZW TYPE STRING,
BIS TYPE STRING,
ZUART TYPE STRING,
LOGIKNR2 TYPE STRING,
AB TYPE STRING,
MESSDRCK TYPE STRING,
ABRFAKT TYPE STRING,
PROGT TYPE STRING,
ATTRIBUT TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_U_30049_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_U_30049_STR-MANDT sy-vline 
WA_U_30049_STR-LOGIKZW sy-vline 
WA_U_30049_STR-BIS sy-vline 
WA_U_30049_STR-ZUART sy-vline 
WA_U_30049_STR-LOGIKNR2 sy-vline 
WA_U_30049_STR-AB sy-vline 
WA_U_30049_STR-MESSDRCK sy-vline 
WA_U_30049_STR-ABRFAKT sy-vline 
WA_U_30049_STR-PROGT sy-vline 
WA_U_30049_STR-ATTRIBUT sy-vline 
WA_U_30049_STR-ERDAT sy-vline 
WA_U_30049_STR-ERNAM sy-vline 
WA_U_30049_STR-AEDAT sy-vline 
WA_U_30049_STR-AENAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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