ABAP Select data from SAP table DTAM300 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DTAM300 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 DTAM300. 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 DTAM300 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_DTAM300 TYPE STANDARD TABLE OF DTAM300,
      WA_DTAM300 TYPE DTAM300,
      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: <DTAM300> TYPE DTAM300.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DTAM300.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DTAM300
  INTO TABLE IT_DTAM300.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTAM300
*  INTO TABLE @DATA(IT_DTAM3002).
*--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_DTAM300 INDEX 1 INTO DATA(WA_DTAM3002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DTAM300 ASSIGNING <DTAM300>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTAM300>-20 = 1.
<DTAM300>-21 = 1.
<DTAM300>-22 = 1.
<DTAM300>-22C = 1.
<DTAM300>-36 = 1.

ENDLOOP.

LOOP AT IT_DTAM300 INTO WA_DTAM300.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTAM300-94, sy-vline,
  WA_DTAM300-17_1, sy-vline,
  WA_DTAM300-17_2, sy-vline,
  WA_DTAM300-82_1, sy-vline,
  WA_DTAM300-82_2, sy-vline,
  WA_DTAM300-82_3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTAM300 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_DTAM300 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_DTAM300 INTO WA_DTAM300.


*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_DTAM300_STR, 
20 TYPE STRING,
21 TYPE STRING,
22 TYPE STRING,
22C TYPE STRING,
36 TYPE STRING,
94 TYPE STRING,
17_1 TYPE STRING,
17_2 TYPE STRING,
82_1 TYPE STRING,
82_2 TYPE STRING,
82_3 TYPE STRING,
82_4 TYPE STRING,
82_5 TYPE STRING,
87_1 TYPE STRING,
87_2 TYPE STRING,
87_3 TYPE STRING,
87_4 TYPE STRING,
87_5 TYPE STRING,
83_1 TYPE STRING,
83_2 TYPE STRING,
83_3 TYPE STRING,
83_4 TYPE STRING,
83_5 TYPE STRING,
77_1 TYPE STRING,
77_2 TYPE STRING,
77_3 TYPE STRING,
77_4 TYPE STRING,
77_5 TYPE STRING,
77_6 TYPE STRING,
53_11 TYPE STRING,
53_21 TYPE STRING,
53_31 TYPE STRING,
53_41 TYPE STRING,
53_51 TYPE STRING,
56_11 TYPE STRING,
56_21 TYPE STRING,
56_31 TYPE STRING,
56_41 TYPE STRING,
56_51 TYPE STRING,
53_12 TYPE STRING,
53_22 TYPE STRING,
53_32 TYPE STRING,
53_42 TYPE STRING,
53_52 TYPE STRING,
56_12 TYPE STRING,
56_22 TYPE STRING,
56_32 TYPE STRING,
56_42 TYPE STRING,
56_52 TYPE STRING,
58_12 TYPE STRING,
58_22 TYPE STRING,
58_32 TYPE STRING,
58_42 TYPE STRING,
58_52 TYPE STRING,
29_1 TYPE STRING,
29_2 TYPE STRING,
29_3 TYPE STRING,
29_4 TYPE STRING,
24 TYPE STRING,
84_1 TYPE STRING,
84_2 TYPE STRING,
84_3 TYPE STRING,
84_4 TYPE STRING,
84_5 TYPE STRING,
85_1 TYPE STRING,
85_2 TYPE STRING,
85_3 TYPE STRING,
85_4 TYPE STRING,
85_5 TYPE STRING,
88_1 TYPE STRING,
88_2 TYPE STRING,
88_3 TYPE STRING,
88_4 TYPE STRING,
88_5 TYPE STRING,
71_1 TYPE STRING,
26 TYPE STRING,
21G TYPE STRING,
72_1 TYPE STRING,
72_2 TYPE STRING,
72_3 TYPE STRING,
72_4 TYPE STRING,
72_5 TYPE STRING,
72_6 TYPE STRING,
99 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTAM300_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_DTAM300_STR-20 sy-vline 
WA_DTAM300_STR-21 sy-vline 
WA_DTAM300_STR-22 sy-vline 
WA_DTAM300_STR-22C sy-vline 
WA_DTAM300_STR-36 sy-vline 
WA_DTAM300_STR-94 sy-vline 
WA_DTAM300_STR-17_1 sy-vline 
WA_DTAM300_STR-17_2 sy-vline 
WA_DTAM300_STR-82_1 sy-vline 
WA_DTAM300_STR-82_2 sy-vline 
WA_DTAM300_STR-82_3 sy-vline 
WA_DTAM300_STR-82_4 sy-vline 
WA_DTAM300_STR-82_5 sy-vline 
WA_DTAM300_STR-87_1 sy-vline 
WA_DTAM300_STR-87_2 sy-vline 
WA_DTAM300_STR-87_3 sy-vline 
WA_DTAM300_STR-87_4 sy-vline 
WA_DTAM300_STR-87_5 sy-vline 
WA_DTAM300_STR-83_1 sy-vline 
WA_DTAM300_STR-83_2 sy-vline 
WA_DTAM300_STR-83_3 sy-vline 
WA_DTAM300_STR-83_4 sy-vline 
WA_DTAM300_STR-83_5 sy-vline 
WA_DTAM300_STR-77_1 sy-vline 
WA_DTAM300_STR-77_2 sy-vline 
WA_DTAM300_STR-77_3 sy-vline 
WA_DTAM300_STR-77_4 sy-vline 
WA_DTAM300_STR-77_5 sy-vline 
WA_DTAM300_STR-77_6 sy-vline 
WA_DTAM300_STR-53_11 sy-vline 
WA_DTAM300_STR-53_21 sy-vline 
WA_DTAM300_STR-53_31 sy-vline 
WA_DTAM300_STR-53_41 sy-vline 
WA_DTAM300_STR-53_51 sy-vline 
WA_DTAM300_STR-56_11 sy-vline 
WA_DTAM300_STR-56_21 sy-vline 
WA_DTAM300_STR-56_31 sy-vline 
WA_DTAM300_STR-56_41 sy-vline 
WA_DTAM300_STR-56_51 sy-vline 
WA_DTAM300_STR-53_12 sy-vline 
WA_DTAM300_STR-53_22 sy-vline 
WA_DTAM300_STR-53_32 sy-vline 
WA_DTAM300_STR-53_42 sy-vline 
WA_DTAM300_STR-53_52 sy-vline 
WA_DTAM300_STR-56_12 sy-vline 
WA_DTAM300_STR-56_22 sy-vline 
WA_DTAM300_STR-56_32 sy-vline 
WA_DTAM300_STR-56_42 sy-vline 
WA_DTAM300_STR-56_52 sy-vline 
WA_DTAM300_STR-58_12 sy-vline 
WA_DTAM300_STR-58_22 sy-vline 
WA_DTAM300_STR-58_32 sy-vline 
WA_DTAM300_STR-58_42 sy-vline 
WA_DTAM300_STR-58_52 sy-vline 
WA_DTAM300_STR-29_1 sy-vline 
WA_DTAM300_STR-29_2 sy-vline 
WA_DTAM300_STR-29_3 sy-vline 
WA_DTAM300_STR-29_4 sy-vline 
WA_DTAM300_STR-24 sy-vline 
WA_DTAM300_STR-84_1 sy-vline 
WA_DTAM300_STR-84_2 sy-vline 
WA_DTAM300_STR-84_3 sy-vline 
WA_DTAM300_STR-84_4 sy-vline 
WA_DTAM300_STR-84_5 sy-vline 
WA_DTAM300_STR-85_1 sy-vline 
WA_DTAM300_STR-85_2 sy-vline 
WA_DTAM300_STR-85_3 sy-vline 
WA_DTAM300_STR-85_4 sy-vline 
WA_DTAM300_STR-85_5 sy-vline 
WA_DTAM300_STR-88_1 sy-vline 
WA_DTAM300_STR-88_2 sy-vline 
WA_DTAM300_STR-88_3 sy-vline 
WA_DTAM300_STR-88_4 sy-vline 
WA_DTAM300_STR-88_5 sy-vline 
WA_DTAM300_STR-71_1 sy-vline 
WA_DTAM300_STR-26 sy-vline 
WA_DTAM300_STR-21G sy-vline 
WA_DTAM300_STR-72_1 sy-vline 
WA_DTAM300_STR-72_2 sy-vline 
WA_DTAM300_STR-72_3 sy-vline 
WA_DTAM300_STR-72_4 sy-vline 
WA_DTAM300_STR-72_5 sy-vline 
WA_DTAM300_STR-72_6 sy-vline 
WA_DTAM300_STR-99 sy-vline      INTO ld_text SEPARATED BY SPACE.

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