ABAP Select data from SAP table SAPWLNDBCON into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLNDBCON
*  INTO TABLE @DATA(IT_SAPWLNDBCON2).
*--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_SAPWLNDBCON INDEX 1 INTO DATA(WA_SAPWLNDBCON2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLNDBCON>-TCODE = 1.
<SAPWLNDBCON>-CONNECTION_NAME = 1.
<SAPWLNDBCON>-COUNTER = 1.
<SAPWLNDBCON>-DBTIME = 1.
<SAPWLNDBCON>-DBTIME_AVG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLNDBCON-READSEQCNT, sy-vline,
  WA_SAPWLNDBCON-READSEQST, sy-vline,
  WA_SAPWLNDBCON-READSEQMT, sy-vline,
  WA_SAPWLNDBCON-READSEQREC, sy-vline,
  WA_SAPWLNDBCON-READDIRCNT, sy-vline,
  WA_SAPWLNDBCON-READDIRST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLNDBCON 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_SAPWLNDBCON 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_SAPWLNDBCON INTO WA_SAPWLNDBCON.


*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_SAPWLNDBCON_STR, 
TCODE TYPE STRING,
CONNECTION_NAME TYPE STRING,
COUNTER TYPE STRING,
DBTIME TYPE STRING,
DBTIME_AVG TYPE STRING,
READSEQCNT TYPE STRING,
READSEQST TYPE STRING,
READSEQMT TYPE STRING,
READSEQREC TYPE STRING,
READDIRCNT TYPE STRING,
READDIRST TYPE STRING,
READDIRMT TYPE STRING,
READDIRREC TYPE STRING,
READSEQBUF TYPE STRING,
CHNGCNT TYPE STRING,
CHNGST TYPE STRING,
CHNGMT TYPE STRING,
CHNGREC TYPE STRING,
DBREQUCNT TYPE STRING,
DBREQMTI TYPE STRING,
PHYREADCNT TYPE STRING,
PHYCHNGREC TYPE STRING,
PHYDBCALLS TYPE STRING,
DBUFREADCN TYPE STRING,
DBPCOUNT TYPE STRING,
DBPTIME TYPE STRING,
DBPTI_AVG TYPE STRING,
COMMITTI TYPE STRING,
COMMITTI_AVG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLNDBCON_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_SAPWLNDBCON_STR-TCODE sy-vline 
WA_SAPWLNDBCON_STR-CONNECTION_NAME sy-vline 
WA_SAPWLNDBCON_STR-COUNTER sy-vline 
WA_SAPWLNDBCON_STR-DBTIME sy-vline 
WA_SAPWLNDBCON_STR-DBTIME_AVG sy-vline 
WA_SAPWLNDBCON_STR-READSEQCNT sy-vline 
WA_SAPWLNDBCON_STR-READSEQST sy-vline 
WA_SAPWLNDBCON_STR-READSEQMT sy-vline 
WA_SAPWLNDBCON_STR-READSEQREC sy-vline 
WA_SAPWLNDBCON_STR-READDIRCNT sy-vline 
WA_SAPWLNDBCON_STR-READDIRST sy-vline 
WA_SAPWLNDBCON_STR-READDIRMT sy-vline 
WA_SAPWLNDBCON_STR-READDIRREC sy-vline 
WA_SAPWLNDBCON_STR-READSEQBUF sy-vline 
WA_SAPWLNDBCON_STR-CHNGCNT sy-vline 
WA_SAPWLNDBCON_STR-CHNGST sy-vline 
WA_SAPWLNDBCON_STR-CHNGMT sy-vline 
WA_SAPWLNDBCON_STR-CHNGREC sy-vline 
WA_SAPWLNDBCON_STR-DBREQUCNT sy-vline 
WA_SAPWLNDBCON_STR-DBREQMTI sy-vline 
WA_SAPWLNDBCON_STR-PHYREADCNT sy-vline 
WA_SAPWLNDBCON_STR-PHYCHNGREC sy-vline 
WA_SAPWLNDBCON_STR-PHYDBCALLS sy-vline 
WA_SAPWLNDBCON_STR-DBUFREADCN sy-vline 
WA_SAPWLNDBCON_STR-DBPCOUNT sy-vline 
WA_SAPWLNDBCON_STR-DBPTIME sy-vline 
WA_SAPWLNDBCON_STR-DBPTI_AVG sy-vline 
WA_SAPWLNDBCON_STR-COMMITTI sy-vline 
WA_SAPWLNDBCON_STR-COMMITTI_AVG sy-vline      INTO ld_text SEPARATED BY SPACE.

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