ABAP Select data from SAP table BDLDATKEY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BDLDATKEY
*  INTO TABLE @DATA(IT_BDLDATKEY2).
*--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_BDLDATKEY INDEX 1 INTO DATA(WA_BDLDATKEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BDLDATKEY>-SESSIONNR = 1.
<BDLDATKEY>-MANDANT = 1.
<BDLDATKEY>-INSTALL_NO = 1.
<BDLDATKEY>-SID = 1.
<BDLDATKEY>-CUST_NO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BDLDATKEY-CONTRACT, sy-vline,
  WA_BDLDATKEY-DESCRIPTIO, sy-vline,
  WA_BDLDATKEY-FUNCMOD, sy-vline,
  WA_BDLDATKEY-HOST, sy-vline,
  WA_BDLDATKEY-INSTANCE, sy-vline,
  WA_BDLDATKEY-SEQNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BDLDATKEY 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_BDLDATKEY 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_BDLDATKEY INTO WA_BDLDATKEY.


*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_BDLDATKEY_STR, 
SESSIONNR TYPE STRING,
MANDANT TYPE STRING,
INSTALL_NO TYPE STRING,
SID TYPE STRING,
CUST_NO TYPE STRING,
CONTRACT TYPE STRING,
DESCRIPTIO TYPE STRING,
FUNCMOD TYPE STRING,
HOST TYPE STRING,
INSTANCE TYPE STRING,
SEQNO TYPE STRING,
CONTEXT TYPE STRING,
TYPE TYPE STRING,
DATUM TYPE STRING,
UHRZEIT TYPE STRING,
CODEPAGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BDLDATKEY_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_BDLDATKEY_STR-SESSIONNR sy-vline 
WA_BDLDATKEY_STR-MANDANT sy-vline 
WA_BDLDATKEY_STR-INSTALL_NO sy-vline 
WA_BDLDATKEY_STR-SID sy-vline 
WA_BDLDATKEY_STR-CUST_NO sy-vline 
WA_BDLDATKEY_STR-CONTRACT sy-vline 
WA_BDLDATKEY_STR-DESCRIPTIO sy-vline 
WA_BDLDATKEY_STR-FUNCMOD sy-vline 
WA_BDLDATKEY_STR-HOST sy-vline 
WA_BDLDATKEY_STR-INSTANCE sy-vline 
WA_BDLDATKEY_STR-SEQNO sy-vline 
WA_BDLDATKEY_STR-CONTEXT sy-vline 
WA_BDLDATKEY_STR-TYPE sy-vline 
WA_BDLDATKEY_STR-DATUM sy-vline 
WA_BDLDATKEY_STR-UHRZEIT sy-vline 
WA_BDLDATKEY_STR-CODEPAGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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