ABAP Select data from SAP table DB6WLM_SC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6WLM_SC 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 DB6WLM_SC. 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 DB6WLM_SC 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_DB6WLM_SC TYPE STANDARD TABLE OF DB6WLM_SC,
      WA_DB6WLM_SC TYPE DB6WLM_SC,
      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: <DB6WLM_SC> TYPE DB6WLM_SC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6WLM_SC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6WLM_SC
  INTO TABLE IT_DB6WLM_SC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6WLM_SC
*  INTO TABLE @DATA(IT_DB6WLM_SC2).
*--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_DB6WLM_SC INDEX 1 INTO DATA(WA_DB6WLM_SC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6WLM_SC ASSIGNING <DB6WLM_SC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6WLM_SC>-SC_ID = 1.
<DB6WLM_SC>-SC_NAME = 1.
<DB6WLM_SC>-PAR_SC_ID = 1.
<DB6WLM_SC>-PAR_SC_NAME = 1.
<DB6WLM_SC>-ENABLED = 1.

ENDLOOP.

LOOP AT IT_DB6WLM_SC INTO WA_DB6WLM_SC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6WLM_SC-AGENTPRIO, sy-vline,
  WA_DB6WLM_SC-PREFETCHPRIO, sy-vline,
  WA_DB6WLM_SC-BPPRIO, sy-vline,
  WA_DB6WLM_SC-CREATE_TIME, sy-vline,
  WA_DB6WLM_SC-ALTER_TIME, sy-vline,
  WA_DB6WLM_SC-INBOUND_CORR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6WLM_SC 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_DB6WLM_SC 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_DB6WLM_SC INTO WA_DB6WLM_SC.


*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_DB6WLM_SC_STR, 
SC_ID TYPE STRING,
SC_NAME TYPE STRING,
PAR_SC_ID TYPE STRING,
PAR_SC_NAME TYPE STRING,
ENABLED TYPE STRING,
AGENTPRIO TYPE STRING,
PREFETCHPRIO TYPE STRING,
BPPRIO TYPE STRING,
CREATE_TIME TYPE STRING,
ALTER_TIME TYPE STRING,
INBOUND_CORR TYPE STRING,
OUTBOUND_CORR TYPE STRING,
COL_AGG_ACT_DATA TYPE STRING,
COL_AGG_REQ_DATA TYPE STRING,
COL_ACT_DATA TYPE STRING,
COL_ACT_PARTITION TYPE STRING,
COLLECTREQMETRICS TYPE STRING,
COLLECTREQMETRICS_OVERWRITTEN TYPE STRING,
REMARKS TYPE STRING,
WD_EXPANDED TYPE STRING,
WD_ENABLED_ICON TYPE STRING,
WD_ENABLED_TOOLTIP TYPE STRING,
IS_SUPERCLASS TYPE STRING,
IS_DFT_SUBCLASS TYPE STRING,
NORM_AGENTPRIO TYPE STRING,
NORM_PREFETCHPRIO TYPE STRING,
NORM_BPPRIO TYPE STRING,
TEXT_AGENTPRIO TYPE STRING,
TEXT_PREFETCHPRIO TYPE STRING,
TEXT_BPPRIO TYPE STRING,
AGENTPRIO_INH TYPE STRING,
PREFETCHPRIO_INH TYPE STRING,
BPPRIO_INH TYPE STRING,
BARWIDTH_AGENTPRIO TYPE STRING,
BARWIDTH_PREFETCHPRIO TYPE STRING,
BARWIDTH_BPPRIO TYPE STRING,
NEW_AGENTPRIO TYPE STRING,
NEW_PREFETCHPRIO TYPE STRING,
NEW_BPPRIO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6WLM_SC_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_DB6WLM_SC_STR-SC_ID sy-vline 
WA_DB6WLM_SC_STR-SC_NAME sy-vline 
WA_DB6WLM_SC_STR-PAR_SC_ID sy-vline 
WA_DB6WLM_SC_STR-PAR_SC_NAME sy-vline 
WA_DB6WLM_SC_STR-ENABLED sy-vline 
WA_DB6WLM_SC_STR-AGENTPRIO sy-vline 
WA_DB6WLM_SC_STR-PREFETCHPRIO sy-vline 
WA_DB6WLM_SC_STR-BPPRIO sy-vline 
WA_DB6WLM_SC_STR-CREATE_TIME sy-vline 
WA_DB6WLM_SC_STR-ALTER_TIME sy-vline 
WA_DB6WLM_SC_STR-INBOUND_CORR sy-vline 
WA_DB6WLM_SC_STR-OUTBOUND_CORR sy-vline 
WA_DB6WLM_SC_STR-COL_AGG_ACT_DATA sy-vline 
WA_DB6WLM_SC_STR-COL_AGG_REQ_DATA sy-vline 
WA_DB6WLM_SC_STR-COL_ACT_DATA sy-vline 
WA_DB6WLM_SC_STR-COL_ACT_PARTITION sy-vline 
WA_DB6WLM_SC_STR-COLLECTREQMETRICS sy-vline 
WA_DB6WLM_SC_STR-COLLECTREQMETRICS_OVERWRITTEN sy-vline 
WA_DB6WLM_SC_STR-REMARKS sy-vline 
WA_DB6WLM_SC_STR-WD_EXPANDED sy-vline 
WA_DB6WLM_SC_STR-WD_ENABLED_ICON sy-vline 
WA_DB6WLM_SC_STR-WD_ENABLED_TOOLTIP sy-vline 
WA_DB6WLM_SC_STR-IS_SUPERCLASS sy-vline 
WA_DB6WLM_SC_STR-IS_DFT_SUBCLASS sy-vline 
WA_DB6WLM_SC_STR-NORM_AGENTPRIO sy-vline 
WA_DB6WLM_SC_STR-NORM_PREFETCHPRIO sy-vline 
WA_DB6WLM_SC_STR-NORM_BPPRIO sy-vline 
WA_DB6WLM_SC_STR-TEXT_AGENTPRIO sy-vline 
WA_DB6WLM_SC_STR-TEXT_PREFETCHPRIO sy-vline 
WA_DB6WLM_SC_STR-TEXT_BPPRIO sy-vline 
WA_DB6WLM_SC_STR-AGENTPRIO_INH sy-vline 
WA_DB6WLM_SC_STR-PREFETCHPRIO_INH sy-vline 
WA_DB6WLM_SC_STR-BPPRIO_INH sy-vline 
WA_DB6WLM_SC_STR-BARWIDTH_AGENTPRIO sy-vline 
WA_DB6WLM_SC_STR-BARWIDTH_PREFETCHPRIO sy-vline 
WA_DB6WLM_SC_STR-BARWIDTH_BPPRIO sy-vline 
WA_DB6WLM_SC_STR-NEW_AGENTPRIO sy-vline 
WA_DB6WLM_SC_STR-NEW_PREFETCHPRIO sy-vline 
WA_DB6WLM_SC_STR-NEW_BPPRIO sy-vline      INTO ld_text SEPARATED BY SPACE.

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