ABAP Select data from SAP table DB2LODLK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2LODLK 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 DB2LODLK. 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 DB2LODLK 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_DB2LODLK TYPE STANDARD TABLE OF DB2LODLK,
      WA_DB2LODLK TYPE DB2LODLK,
      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: <DB2LODLK> TYPE DB2LODLK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2LODLK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2LODLK
  INTO TABLE IT_DB2LODLK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2LODLK
*  INTO TABLE @DATA(IT_DB2LODLK2).
*--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_DB2LODLK INDEX 1 INTO DATA(WA_DB2LODLK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2LODLK ASSIGNING <DB2LODLK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2LODLK>-LODLKSSID = 1.
<DB2LODLK>-LODLKLUUV = 1.
<DB2LODLK>-LODLKDATE = 1.
<DB2LODLK>-LODLKTIME = 1.
<DB2LODLK>-LODLKMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2LODLK INTO WA_DB2LODLK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2LODLK-LODLKPLAN, sy-vline,
  WA_DB2LODLK-LODLKCN, sy-vline,
  WA_DB2LODLK-LODLKCV, sy-vline,
  WA_DB2LODLK-LODLKAID, sy-vline,
  WA_DB2LODLK-LODLKEUID, sy-vline,
  WA_DB2LODLK-LODLKEUTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2LODLK 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_DB2LODLK 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_DB2LODLK INTO WA_DB2LODLK.


*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_DB2LODLK_STR, 
LODLKSSID TYPE STRING,
LODLKLUUV TYPE STRING,
LODLKDATE TYPE STRING,
LODLKTIME TYPE STRING,
LODLKMSEC TYPE STRING,
LODLKPLAN TYPE STRING,
LODLKCN TYPE STRING,
LODLKCV TYPE STRING,
LODLKAID TYPE STRING,
LODLKEUID TYPE STRING,
LODLKEUTX TYPE STRING,
LODLKEUWN TYPE STRING,
LODLKDSGN TYPE STRING,
LODLKMEMN TYPE STRING,
LODLKIT TYPE STRING,
LODLKNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2LODLK_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_DB2LODLK_STR-LODLKSSID sy-vline 
WA_DB2LODLK_STR-LODLKLUUV sy-vline 
WA_DB2LODLK_STR-LODLKDATE sy-vline 
WA_DB2LODLK_STR-LODLKTIME sy-vline 
WA_DB2LODLK_STR-LODLKMSEC sy-vline 
WA_DB2LODLK_STR-LODLKPLAN sy-vline 
WA_DB2LODLK_STR-LODLKCN sy-vline 
WA_DB2LODLK_STR-LODLKCV sy-vline 
WA_DB2LODLK_STR-LODLKAID sy-vline 
WA_DB2LODLK_STR-LODLKEUID sy-vline 
WA_DB2LODLK_STR-LODLKEUTX sy-vline 
WA_DB2LODLK_STR-LODLKEUWN sy-vline 
WA_DB2LODLK_STR-LODLKDSGN sy-vline 
WA_DB2LODLK_STR-LODLKMEMN sy-vline 
WA_DB2LODLK_STR-LODLKIT sy-vline 
WA_DB2LODLK_STR-LODLKNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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