ABAP Select data from SAP table MSQ_DBCNFG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSQ_DBCNFG
*  INTO TABLE @DATA(IT_MSQ_DBCNFG2).
*--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_MSQ_DBCNFG INDEX 1 INTO DATA(WA_MSQ_DBCNFG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSQ_DBCNFG>-AFFMASK = 1.
<MSQ_DBCNFG>-ALLOWUPDS = 1.
<MSQ_DBCNFG>-COSTTHRPAL = 1.
<MSQ_DBCNFG>-COSTTHRCUR = 1.
<MSQ_DBCNFG>-DEFLTLANG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSQ_DBCNFG-DEFSORTORD, sy-vline,
  WA_MSQ_DBCNFG-EXTMEMSIZE, sy-vline,
  WA_MSQ_DBCNFG-SQLFILFACT, sy-vline,
  WA_MSQ_DBCNFG-INDXCREMEM, sy-vline,
  WA_MSQ_DBCNFG-LANGINCACH, sy-vline,
  WA_MSQ_DBCNFG-FIBERMODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSQ_DBCNFG 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_MSQ_DBCNFG 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_MSQ_DBCNFG INTO WA_MSQ_DBCNFG.


*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_MSQ_DBCNFG_STR, 
AFFMASK TYPE STRING,
ALLOWUPDS TYPE STRING,
COSTTHRPAL TYPE STRING,
COSTTHRCUR TYPE STRING,
DEFLTLANG TYPE STRING,
DEFSORTORD TYPE STRING,
EXTMEMSIZE TYPE STRING,
SQLFILFACT TYPE STRING,
INDXCREMEM TYPE STRING,
LANGINCACH TYPE STRING,
FIBERMODE TYPE STRING,
SQLLOCKS TYPE STRING,
MAXASYNCIO TYPE STRING,
MAXDEGPARL TYPE STRING,
MAXSVRMEM TYPE STRING,
MAXTXTRSZ TYPE STRING,
MAXWRKTHDS TYPE STRING,
MEDIARETN TYPE STRING,
MINSVRMEM TYPE STRING,
NESTTRIGS TYPE STRING,
NETPACKSZ TYPE STRING,
OPENOBJS TYPE STRING,
PRIORTYBST TYPE STRING,
QRYGOVCOST TYPE STRING,
QUERYWAIT TYPE STRING,
RECVRYINTL TYPE STRING,
REMOTACCES TYPE STRING,
REMLOGTMOT TYPE STRING,
REMPROCTRX TYPE STRING,
REMQRYTMOT TYPE STRING,
RESRCTMOUT TYPE STRING,
SCANSUPROC TYPE STRING,
WORKSETSZ TYPE STRING,
SHOWADVOPS TYPE STRING,
SPINCOUNTR TYPE STRING,
TIMESLICE TYPE STRING,
UNCMPSTYLE TYPE STRING,
UNCLOCID TYPE STRING,
USERCONNS TYPE STRING,
USEROPTINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSQ_DBCNFG_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_MSQ_DBCNFG_STR-AFFMASK sy-vline 
WA_MSQ_DBCNFG_STR-ALLOWUPDS sy-vline 
WA_MSQ_DBCNFG_STR-COSTTHRPAL sy-vline 
WA_MSQ_DBCNFG_STR-COSTTHRCUR sy-vline 
WA_MSQ_DBCNFG_STR-DEFLTLANG sy-vline 
WA_MSQ_DBCNFG_STR-DEFSORTORD sy-vline 
WA_MSQ_DBCNFG_STR-EXTMEMSIZE sy-vline 
WA_MSQ_DBCNFG_STR-SQLFILFACT sy-vline 
WA_MSQ_DBCNFG_STR-INDXCREMEM sy-vline 
WA_MSQ_DBCNFG_STR-LANGINCACH sy-vline 
WA_MSQ_DBCNFG_STR-FIBERMODE sy-vline 
WA_MSQ_DBCNFG_STR-SQLLOCKS sy-vline 
WA_MSQ_DBCNFG_STR-MAXASYNCIO sy-vline 
WA_MSQ_DBCNFG_STR-MAXDEGPARL sy-vline 
WA_MSQ_DBCNFG_STR-MAXSVRMEM sy-vline 
WA_MSQ_DBCNFG_STR-MAXTXTRSZ sy-vline 
WA_MSQ_DBCNFG_STR-MAXWRKTHDS sy-vline 
WA_MSQ_DBCNFG_STR-MEDIARETN sy-vline 
WA_MSQ_DBCNFG_STR-MINSVRMEM sy-vline 
WA_MSQ_DBCNFG_STR-NESTTRIGS sy-vline 
WA_MSQ_DBCNFG_STR-NETPACKSZ sy-vline 
WA_MSQ_DBCNFG_STR-OPENOBJS sy-vline 
WA_MSQ_DBCNFG_STR-PRIORTYBST sy-vline 
WA_MSQ_DBCNFG_STR-QRYGOVCOST sy-vline 
WA_MSQ_DBCNFG_STR-QUERYWAIT sy-vline 
WA_MSQ_DBCNFG_STR-RECVRYINTL sy-vline 
WA_MSQ_DBCNFG_STR-REMOTACCES sy-vline 
WA_MSQ_DBCNFG_STR-REMLOGTMOT sy-vline 
WA_MSQ_DBCNFG_STR-REMPROCTRX sy-vline 
WA_MSQ_DBCNFG_STR-REMQRYTMOT sy-vline 
WA_MSQ_DBCNFG_STR-RESRCTMOUT sy-vline 
WA_MSQ_DBCNFG_STR-SCANSUPROC sy-vline 
WA_MSQ_DBCNFG_STR-WORKSETSZ sy-vline 
WA_MSQ_DBCNFG_STR-SHOWADVOPS sy-vline 
WA_MSQ_DBCNFG_STR-SPINCOUNTR sy-vline 
WA_MSQ_DBCNFG_STR-TIMESLICE sy-vline 
WA_MSQ_DBCNFG_STR-UNCMPSTYLE sy-vline 
WA_MSQ_DBCNFG_STR-UNCLOCID sy-vline 
WA_MSQ_DBCNFG_STR-USERCONNS sy-vline 
WA_MSQ_DBCNFG_STR-USEROPTINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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