ABAP Select data from SAP table WUF_TEST_FIXED into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WUF_TEST_FIXED
*  INTO TABLE @DATA(IT_WUF_TEST_FIXED2).
*--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_WUF_TEST_FIXED INDEX 1 INTO DATA(WA_WUF_TEST_FIXED2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WUF_TEST_FIXED>-PACKED = 1.
<WUF_TEST_FIXED>-FLOAT = 1.
<WUF_TEST_FIXED>-CHAR = 1.
<WUF_TEST_FIXED>-BYTE = 1.
<WUF_TEST_FIXED>-DATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WUF_TEST_FIXED-TIME, sy-vline,
  WA_WUF_TEST_FIXED-NUM, sy-vline,
  WA_WUF_TEST_FIXED-INT, sy-vline,
  WA_WUF_TEST_FIXED-STRING, sy-vline,
  WA_WUF_TEST_FIXED-CSEQUENCE, sy-vline,
  WA_WUF_TEST_FIXED-CLIKE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WUF_TEST_FIXED 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_WUF_TEST_FIXED 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_WUF_TEST_FIXED INTO WA_WUF_TEST_FIXED.


*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_WUF_TEST_FIXED_STR, 
PACKED TYPE STRING,
FLOAT TYPE STRING,
CHAR TYPE STRING,
BYTE TYPE STRING,
DATE TYPE STRING,
TIME TYPE STRING,
NUM TYPE STRING,
INT TYPE STRING,
STRING TYPE STRING,
CSEQUENCE TYPE STRING,
CLIKE TYPE STRING,
DATA TYPE STRING,
CHAR10 TYPE STRING,
DEC10_2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WUF_TEST_FIXED_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_WUF_TEST_FIXED_STR-PACKED sy-vline 
WA_WUF_TEST_FIXED_STR-FLOAT sy-vline 
WA_WUF_TEST_FIXED_STR-CHAR sy-vline 
WA_WUF_TEST_FIXED_STR-BYTE sy-vline 
WA_WUF_TEST_FIXED_STR-DATE sy-vline 
WA_WUF_TEST_FIXED_STR-TIME sy-vline 
WA_WUF_TEST_FIXED_STR-NUM sy-vline 
WA_WUF_TEST_FIXED_STR-INT sy-vline 
WA_WUF_TEST_FIXED_STR-STRING sy-vline 
WA_WUF_TEST_FIXED_STR-CSEQUENCE sy-vline 
WA_WUF_TEST_FIXED_STR-CLIKE sy-vline 
WA_WUF_TEST_FIXED_STR-DATA sy-vline 
WA_WUF_TEST_FIXED_STR-CHAR10 sy-vline 
WA_WUF_TEST_FIXED_STR-DEC10_2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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