ABAP Select data from SAP table DB2QW199 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QW199 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 DB2QW199. 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 DB2QW199 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_DB2QW199 TYPE STANDARD TABLE OF DB2QW199,
      WA_DB2QW199 TYPE DB2QW199,
      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: <DB2QW199> TYPE DB2QW199.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QW199.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QW199
  INTO TABLE IT_DB2QW199.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QW199
*  INTO TABLE @DATA(IT_DB2QW1992).
*--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_DB2QW199 INDEX 1 INTO DATA(WA_DB2QW1992).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QW199 ASSIGNING <DB2QW199>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QW199>-CLGUID = 1.
<DB2QW199>-USERID = 1.
<DB2QW199>-DSSDATE = 1.
<DB2QW199>-DSSTIME = 1.
<DB2QW199>-DSSMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2QW199 INTO WA_DB2QW199.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QW199-DSSDBNAME, sy-vline,
  WA_DB2QW199-DSSTSNAME, sy-vline,
  WA_DB2QW199-QW0199DN, sy-vline,
  WA_DB2QW199-DSSMEMB, sy-vline,
  WA_DB2QW199-DB2PSTYPE, sy-vline,
  WA_DB2QW199-DB2GBPDEP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QW199 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_DB2QW199 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_DB2QW199 INTO WA_DB2QW199.


*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_DB2QW199_STR, 
CLGUID TYPE STRING,
USERID TYPE STRING,
DSSDATE TYPE STRING,
DSSTIME TYPE STRING,
DSSMSEC TYPE STRING,
DSSDBNAME TYPE STRING,
DSSTSNAME TYPE STRING,
QW0199DN TYPE STRING,
DSSMEMB TYPE STRING,
DB2PSTYPE TYPE STRING,
DB2GBPDEP TYPE STRING,
DB2SYNCIO TYPE STRING,
DB2APGAIO TYPE STRING,
DB2AIOMIN TYPE STRING,
DB2CASHPG TYPE STRING,
DB2CHANPG TYPE STRING,
DB2HPCAPG TYPE STRING,
DB2DBPNM TYPE STRING,
QW0199TS TYPE STRING,
QW0199DB TYPE STRING,
QW0199OB TYPE STRING,
QW0199BP TYPE STRING,
QW0199DS TYPE STRING,
QW0199SV TYPE STRING,
QW0199SX TYPE STRING,
QW0199SP TYPE STRING,
QW0199AD TYPE STRING,
QW0199AX TYPE STRING,
QW0199AP TYPE STRING,
QW0199AC TYPE STRING,
QW0199VP TYPE STRING,
QW0199VD TYPE STRING,
QW0199HP TYPE STRING,
S199AP TYPE STRING,
QWP1DTIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QW199_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_DB2QW199_STR-CLGUID sy-vline 
WA_DB2QW199_STR-USERID sy-vline 
WA_DB2QW199_STR-DSSDATE sy-vline 
WA_DB2QW199_STR-DSSTIME sy-vline 
WA_DB2QW199_STR-DSSMSEC sy-vline 
WA_DB2QW199_STR-DSSDBNAME sy-vline 
WA_DB2QW199_STR-DSSTSNAME sy-vline 
WA_DB2QW199_STR-QW0199DN sy-vline 
WA_DB2QW199_STR-DSSMEMB sy-vline 
WA_DB2QW199_STR-DB2PSTYPE sy-vline 
WA_DB2QW199_STR-DB2GBPDEP sy-vline 
WA_DB2QW199_STR-DB2SYNCIO sy-vline 
WA_DB2QW199_STR-DB2APGAIO sy-vline 
WA_DB2QW199_STR-DB2AIOMIN sy-vline 
WA_DB2QW199_STR-DB2CASHPG sy-vline 
WA_DB2QW199_STR-DB2CHANPG sy-vline 
WA_DB2QW199_STR-DB2HPCAPG sy-vline 
WA_DB2QW199_STR-DB2DBPNM sy-vline 
WA_DB2QW199_STR-QW0199TS sy-vline 
WA_DB2QW199_STR-QW0199DB sy-vline 
WA_DB2QW199_STR-QW0199OB sy-vline 
WA_DB2QW199_STR-QW0199BP sy-vline 
WA_DB2QW199_STR-QW0199DS sy-vline 
WA_DB2QW199_STR-QW0199SV sy-vline 
WA_DB2QW199_STR-QW0199SX sy-vline 
WA_DB2QW199_STR-QW0199SP sy-vline 
WA_DB2QW199_STR-QW0199AD sy-vline 
WA_DB2QW199_STR-QW0199AX sy-vline 
WA_DB2QW199_STR-QW0199AP sy-vline 
WA_DB2QW199_STR-QW0199AC sy-vline 
WA_DB2QW199_STR-QW0199VP sy-vline 
WA_DB2QW199_STR-QW0199VD sy-vline 
WA_DB2QW199_STR-QW0199HP sy-vline 
WA_DB2QW199_STR-S199AP sy-vline 
WA_DB2QW199_STR-QWP1DTIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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