ABAP Select data from SAP table SMT_TEST_EXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SMT_TEST_EXT
*  INTO TABLE @DATA(IT_SMT_TEST_EXT2).
*--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_SMT_TEST_EXT INDEX 1 INTO DATA(WA_SMT_TEST_EXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SMT_TEST_EXT>-NUM = 1.
<SMT_TEST_EXT>-ITEM = 1.
<SMT_TEST_EXT>-CURR_ISO = 1.
<SMT_TEST_EXT>-AMOUNT_ISO = 1.
<SMT_TEST_EXT>-DATE_EXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SMT_TEST_EXT-NUMBER_3DEC, sy-vline,
  WA_SMT_TEST_EXT-CONTROLLER, sy-vline,
  WA_SMT_TEST_EXT-CURR_ISO2, sy-vline,
  WA_SMT_TEST_EXT-AMOUNT_ISO2, sy-vline,
  WA_SMT_TEST_EXT-STRING, sy-vline,
  WA_SMT_TEST_EXT-CHAR10, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SMT_TEST_EXT 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_SMT_TEST_EXT 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_SMT_TEST_EXT INTO WA_SMT_TEST_EXT.


*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_SMT_TEST_EXT_STR, 
NUM TYPE STRING,
ITEM TYPE STRING,
CURR_ISO TYPE STRING,
AMOUNT_ISO TYPE STRING,
DATE_EXT TYPE STRING,
NUMBER_3DEC TYPE STRING,
CONTROLLER TYPE STRING,
CURR_ISO2 TYPE STRING,
AMOUNT_ISO2 TYPE STRING,
STRING TYPE STRING,
CHAR10 TYPE STRING,
CURR_ISO_EXT TYPE STRING,
AMOUNT_ISO_EXT TYPE STRING,
DATE_EXT_EXT TYPE STRING,
NUMBER_3DEC_EXT TYPE STRING,
CURR_ISO2_EXT TYPE STRING,
STRING_EXT TYPE STRING,
CHAR10_EXT TYPE STRING,
CURR_ISO3 TYPE STRING,
AMOUNT_ISO3 TYPE STRING,
STRING1 TYPE STRING,
STRING2 TYPE STRING,
STRING3 TYPE STRING,
STRING4 TYPE STRING,
STRING5 TYPE STRING,
STRING6 TYPE STRING,
STRING7 TYPE STRING,
STRING8 TYPE STRING,
STRING9 TYPE STRING,
STRING10 TYPE STRING,
STRING11 TYPE STRING,
STRING12 TYPE STRING,
STRING13 TYPE STRING,
STRING14 TYPE STRING,
STRING15 TYPE STRING,
STRING16 TYPE STRING,
STRING17 TYPE STRING,
STRING18 TYPE STRING,
STRING19 TYPE STRING,
STRING20 TYPE STRING,
STRING21 TYPE STRING,
STRING22 TYPE STRING,
STRING23 TYPE STRING,
STRING24 TYPE STRING,
STRING25 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SMT_TEST_EXT_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_SMT_TEST_EXT_STR-NUM sy-vline 
WA_SMT_TEST_EXT_STR-ITEM sy-vline 
WA_SMT_TEST_EXT_STR-CURR_ISO sy-vline 
WA_SMT_TEST_EXT_STR-AMOUNT_ISO sy-vline 
WA_SMT_TEST_EXT_STR-DATE_EXT sy-vline 
WA_SMT_TEST_EXT_STR-NUMBER_3DEC sy-vline 
WA_SMT_TEST_EXT_STR-CONTROLLER sy-vline 
WA_SMT_TEST_EXT_STR-CURR_ISO2 sy-vline 
WA_SMT_TEST_EXT_STR-AMOUNT_ISO2 sy-vline 
WA_SMT_TEST_EXT_STR-STRING sy-vline 
WA_SMT_TEST_EXT_STR-CHAR10 sy-vline 
WA_SMT_TEST_EXT_STR-CURR_ISO_EXT sy-vline 
WA_SMT_TEST_EXT_STR-AMOUNT_ISO_EXT sy-vline 
WA_SMT_TEST_EXT_STR-DATE_EXT_EXT sy-vline 
WA_SMT_TEST_EXT_STR-NUMBER_3DEC_EXT sy-vline 
WA_SMT_TEST_EXT_STR-CURR_ISO2_EXT sy-vline 
WA_SMT_TEST_EXT_STR-STRING_EXT sy-vline 
WA_SMT_TEST_EXT_STR-CHAR10_EXT sy-vline 
WA_SMT_TEST_EXT_STR-CURR_ISO3 sy-vline 
WA_SMT_TEST_EXT_STR-AMOUNT_ISO3 sy-vline 
WA_SMT_TEST_EXT_STR-STRING1 sy-vline 
WA_SMT_TEST_EXT_STR-STRING2 sy-vline 
WA_SMT_TEST_EXT_STR-STRING3 sy-vline 
WA_SMT_TEST_EXT_STR-STRING4 sy-vline 
WA_SMT_TEST_EXT_STR-STRING5 sy-vline 
WA_SMT_TEST_EXT_STR-STRING6 sy-vline 
WA_SMT_TEST_EXT_STR-STRING7 sy-vline 
WA_SMT_TEST_EXT_STR-STRING8 sy-vline 
WA_SMT_TEST_EXT_STR-STRING9 sy-vline 
WA_SMT_TEST_EXT_STR-STRING10 sy-vline 
WA_SMT_TEST_EXT_STR-STRING11 sy-vline 
WA_SMT_TEST_EXT_STR-STRING12 sy-vline 
WA_SMT_TEST_EXT_STR-STRING13 sy-vline 
WA_SMT_TEST_EXT_STR-STRING14 sy-vline 
WA_SMT_TEST_EXT_STR-STRING15 sy-vline 
WA_SMT_TEST_EXT_STR-STRING16 sy-vline 
WA_SMT_TEST_EXT_STR-STRING17 sy-vline 
WA_SMT_TEST_EXT_STR-STRING18 sy-vline 
WA_SMT_TEST_EXT_STR-STRING19 sy-vline 
WA_SMT_TEST_EXT_STR-STRING20 sy-vline 
WA_SMT_TEST_EXT_STR-STRING21 sy-vline 
WA_SMT_TEST_EXT_STR-STRING22 sy-vline 
WA_SMT_TEST_EXT_STR-STRING23 sy-vline 
WA_SMT_TEST_EXT_STR-STRING24 sy-vline 
WA_SMT_TEST_EXT_STR-STRING25 sy-vline      INTO ld_text SEPARATED BY SPACE.

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