ABAP Select data from SAP table U_27942 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP U_27942 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_27942. 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_27942 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_27942 TYPE STANDARD TABLE OF U_27942,
      WA_U_27942 TYPE U_27942,
      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_27942> TYPE U_27942.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_U_27942.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM U_27942
  INTO TABLE IT_U_27942.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM U_27942
*  INTO TABLE @DATA(IT_U_279422).
*--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_27942 INDEX 1 INTO DATA(WA_U_279422).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_U_27942 ASSIGNING <U_27942>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<U_27942>-SNAME = 1.
<U_27942>-EXECU = 1.
<U_27942>-GENER = 1.
<U_27942>-RESPU = 1.
<U_27942>-RELEA = 1.

ENDLOOP.

LOOP AT IT_U_27942 INTO WA_U_27942.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_U_27942-CDATE, sy-vline,
  WA_U_27942-UVERS, sy-vline,
  WA_U_27942-UNAME, sy-vline,
  WA_U_27942-UDATE, sy-vline,
  WA_U_27942-UTIME, sy-vline,
  WA_U_27942-PNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_U_27942 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_27942 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_27942 INTO WA_U_27942.


*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_27942_STR, 
SNAME TYPE STRING,
EXECU TYPE STRING,
GENER TYPE STRING,
RESPU TYPE STRING,
RELEA TYPE STRING,
CDATE TYPE STRING,
UVERS TYPE STRING,
UNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
PNAME TYPE STRING,
PVERS TYPE STRING,
PUNAM TYPE STRING,
PUDAT TYPE STRING,
PUTIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_U_27942_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_27942_STR-SNAME sy-vline 
WA_U_27942_STR-EXECU sy-vline 
WA_U_27942_STR-GENER sy-vline 
WA_U_27942_STR-RESPU sy-vline 
WA_U_27942_STR-RELEA sy-vline 
WA_U_27942_STR-CDATE sy-vline 
WA_U_27942_STR-UVERS sy-vline 
WA_U_27942_STR-UNAME sy-vline 
WA_U_27942_STR-UDATE sy-vline 
WA_U_27942_STR-UTIME sy-vline 
WA_U_27942_STR-PNAME sy-vline 
WA_U_27942_STR-PVERS sy-vline 
WA_U_27942_STR-PUNAM sy-vline 
WA_U_27942_STR-PUDAT sy-vline 
WA_U_27942_STR-PUTIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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