ABAP Select data from SAP table DEMO_EXPRESSIONS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DEMO_EXPRESSIONS
*  INTO TABLE @DATA(IT_DEMO_EXPRESSIONS2).
*--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_DEMO_EXPRESSIONS INDEX 1 INTO DATA(WA_DEMO_EXPRESSIONS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DEMO_EXPRESSIONS>-MANDT = 1.
<DEMO_EXPRESSIONS>-ID = 1.
<DEMO_EXPRESSIONS>-NUM1 = 1.
<DEMO_EXPRESSIONS>-NUM2 = 1.
<DEMO_EXPRESSIONS>-NUMLONG1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DEMO_EXPRESSIONS-NUMLONG2, sy-vline,
  WA_DEMO_EXPRESSIONS-DEC1, sy-vline,
  WA_DEMO_EXPRESSIONS-DEC2, sy-vline,
  WA_DEMO_EXPRESSIONS-DEC3, sy-vline,
  WA_DEMO_EXPRESSIONS-FLTP1, sy-vline,
  WA_DEMO_EXPRESSIONS-FLTP2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DEMO_EXPRESSIONS 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_DEMO_EXPRESSIONS 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_DEMO_EXPRESSIONS INTO WA_DEMO_EXPRESSIONS.


*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_DEMO_EXPRESSIONS_STR, 
MANDT TYPE STRING,
ID TYPE STRING,
NUM1 TYPE STRING,
NUM2 TYPE STRING,
NUMLONG1 TYPE STRING,
NUMLONG2 TYPE STRING,
DEC1 TYPE STRING,
DEC2 TYPE STRING,
DEC3 TYPE STRING,
FLTP1 TYPE STRING,
FLTP2 TYPE STRING,
D34N1 TYPE STRING,
D34N2 TYPE STRING,
DECF1 TYPE STRING,
DECF2 TYPE STRING,
CHAR1 TYPE STRING,
CHAR2 TYPE STRING,
NUMC1 TYPE STRING,
NUMC2 TYPE STRING,
STRING1 TYPE STRING,
STRING2 TYPE STRING,
RAW1 TYPE STRING,
RAW2 TYPE STRING,
XSTRING1 TYPE STRING,
XSTRING2 TYPE STRING,
DATN1 TYPE STRING,
DATN2 TYPE STRING,
DATS1 TYPE STRING,
DATS2 TYPE STRING,
TIMN1 TYPE STRING,
TIMN2 TYPE STRING,
TIMS1 TYPE STRING,
TIMS2 TYPE STRING,
UTCL1 TYPE STRING,
UTCL2 TYPE STRING,
TIMESTAMP1 TYPE STRING,
TIMESTAMP2 TYPE STRING,
TIMESTAMPL1 TYPE STRING,
TIMESTAMPL2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DEMO_EXPRESSIONS_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_DEMO_EXPRESSIONS_STR-MANDT sy-vline 
WA_DEMO_EXPRESSIONS_STR-ID sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUM1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUM2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUMLONG1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUMLONG2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DEC1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DEC2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DEC3 sy-vline 
WA_DEMO_EXPRESSIONS_STR-FLTP1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-FLTP2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-D34N1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-D34N2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DECF1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DECF2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-CHAR1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-CHAR2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUMC1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-NUMC2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-STRING1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-STRING2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-RAW1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-RAW2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-XSTRING1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-XSTRING2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DATN1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DATN2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DATS1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-DATS2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMN1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMN2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMS1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMS2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-UTCL1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-UTCL2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMESTAMP1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMESTAMP2 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMESTAMPL1 sy-vline 
WA_DEMO_EXPRESSIONS_STR-TIMESTAMPL2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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