ABAP Select data from SAP table DTYPE_DMLDB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTYPE_DMLDB
*  INTO TABLE @DATA(IT_DTYPE_DMLDB2).
*--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_DTYPE_DMLDB INDEX 1 INTO DATA(WA_DTYPE_DMLDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTYPE_DMLDB>-CLIENT = 1.
<DTYPE_DMLDB>-OBJVERS_ID = 1.
<DTYPE_DMLDB>-CHANGE_COUNTER = 1.
<DTYPE_DMLDB>-OBJECT_TYPE = 1.
<DTYPE_DMLDB>-OBJECT_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTYPE_DMLDB-VERSION, sy-vline,
  WA_DTYPE_DMLDB-STATUS_SCHEMA, sy-vline,
  WA_DTYPE_DMLDB-STATE_ID, sy-vline,
  WA_DTYPE_DMLDB-OWNER, sy-vline,
  WA_DTYPE_DMLDB-OBJGROUP, sy-vline,
  WA_DTYPE_DMLDB-LOG_HANDLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTYPE_DMLDB 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_DTYPE_DMLDB 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_DTYPE_DMLDB INTO WA_DTYPE_DMLDB.


*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.

*Conversion exit OWNER, internal->external for field OWNER
CALL FUNCTION 'CONVERSION_EXIT_OWNER_OUTPUT'
  EXPORTING
    input =                      WA_DTYPE_DMLDB-OWNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DTYPE_DMLDB-OWNER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORG_SYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DTYPE_DMLDB-ORG_SYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DTYPE_DMLDB-ORG_SYSTEM.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_DTYPE_DMLDB_STR, 
CLIENT TYPE STRING,
OBJVERS_ID TYPE STRING,
CHANGE_COUNTER TYPE STRING,
OBJECT_TYPE TYPE STRING,
OBJECT_ID TYPE STRING,
VERSION TYPE STRING,
STATUS_SCHEMA TYPE STRING,
STATE_ID TYPE STRING,
OWNER TYPE STRING,
OBJGROUP TYPE STRING,
LOG_HANDLE TYPE STRING,
CHANGE_ORDER TYPE STRING,
DELETED TYPE STRING,
USER_CREATE TYPE STRING,
TIMESTMP_CREATE TYPE STRING,
USER_MODIFY TYPE STRING,
TIMESTMP_MODIFY TYPE STRING,
ORG_SYSTEM TYPE STRING,
DTYPE_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTYPE_DMLDB_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_DTYPE_DMLDB_STR-CLIENT sy-vline 
WA_DTYPE_DMLDB_STR-OBJVERS_ID sy-vline 
WA_DTYPE_DMLDB_STR-CHANGE_COUNTER sy-vline 
WA_DTYPE_DMLDB_STR-OBJECT_TYPE sy-vline 
WA_DTYPE_DMLDB_STR-OBJECT_ID sy-vline 
WA_DTYPE_DMLDB_STR-VERSION sy-vline 
WA_DTYPE_DMLDB_STR-STATUS_SCHEMA sy-vline 
WA_DTYPE_DMLDB_STR-STATE_ID sy-vline 
WA_DTYPE_DMLDB_STR-OWNER sy-vline 
WA_DTYPE_DMLDB_STR-OBJGROUP sy-vline 
WA_DTYPE_DMLDB_STR-LOG_HANDLE sy-vline 
WA_DTYPE_DMLDB_STR-CHANGE_ORDER sy-vline 
WA_DTYPE_DMLDB_STR-DELETED sy-vline 
WA_DTYPE_DMLDB_STR-USER_CREATE sy-vline 
WA_DTYPE_DMLDB_STR-TIMESTMP_CREATE sy-vline 
WA_DTYPE_DMLDB_STR-USER_MODIFY sy-vline 
WA_DTYPE_DMLDB_STR-TIMESTMP_MODIFY sy-vline 
WA_DTYPE_DMLDB_STR-ORG_SYSTEM sy-vline 
WA_DTYPE_DMLDB_STR-DTYPE_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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