ABAP Select data from SAP table MVS_SPAG_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MVS_SPAG_S
*  INTO TABLE @DATA(IT_MVS_SPAG_S2).
*--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_MVS_SPAG_S INDEX 1 INTO DATA(WA_MVS_SPAG_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MVS_SPAG_S>-TYPE = 1.
<MVS_SPAG_S>-SUBTYPE = 1.
<MVS_SPAG_S>-SERIALNR = 1.
<MVS_SPAG_S>-INTRVALSEC = 1.
<MVS_SPAG_S>-SMPLCOUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MVS_SPAG_S-MINPROCUTL, sy-vline,
  WA_MVS_SPAG_S-MAXPROCUTL, sy-vline,
  WA_MVS_SPAG_S-AVGPROCUTL, sy-vline,
  WA_MVS_SPAG_S-MINSYSPGRT, sy-vline,
  WA_MVS_SPAG_S-MAXSYSPGRT, sy-vline,
  WA_MVS_SPAG_S-AVGSYSPGRT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MVS_SPAG_S 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_MVS_SPAG_S 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_MVS_SPAG_S INTO WA_MVS_SPAG_S.


*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_MVS_SPAG_S_STR, 
TYPE TYPE STRING,
SUBTYPE TYPE STRING,
SERIALNR TYPE STRING,
INTRVALSEC TYPE STRING,
SMPLCOUNT TYPE STRING,
MINPROCUTL TYPE STRING,
MAXPROCUTL TYPE STRING,
AVGPROCUTL TYPE STRING,
MINSYSPGRT TYPE STRING,
MAXSYSPGRT TYPE STRING,
AVGSYSPGRT TYPE STRING,
MINMVSUTL TYPE STRING,
MAXMVSUTL TYPE STRING,
AVGMVSUTL TYPE STRING,
PG_IN TYPE STRING,
PG_OUT TYPE STRING,
PG_IN_PRV TYPE STRING,
PG_OT_PRV TYPE STRING,
PG_TO_EXST TYPE STRING,
PG_FR_EXST TYPE STRING,
PG_IN_BLCK TYPE STRING,
PG_IN_BNUM TYPE STRING,
RESERV1 TYPE STRING,
RESERV2 TYPE STRING,
RESERV3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MVS_SPAG_S_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_MVS_SPAG_S_STR-TYPE sy-vline 
WA_MVS_SPAG_S_STR-SUBTYPE sy-vline 
WA_MVS_SPAG_S_STR-SERIALNR sy-vline 
WA_MVS_SPAG_S_STR-INTRVALSEC sy-vline 
WA_MVS_SPAG_S_STR-SMPLCOUNT sy-vline 
WA_MVS_SPAG_S_STR-MINPROCUTL sy-vline 
WA_MVS_SPAG_S_STR-MAXPROCUTL sy-vline 
WA_MVS_SPAG_S_STR-AVGPROCUTL sy-vline 
WA_MVS_SPAG_S_STR-MINSYSPGRT sy-vline 
WA_MVS_SPAG_S_STR-MAXSYSPGRT sy-vline 
WA_MVS_SPAG_S_STR-AVGSYSPGRT sy-vline 
WA_MVS_SPAG_S_STR-MINMVSUTL sy-vline 
WA_MVS_SPAG_S_STR-MAXMVSUTL sy-vline 
WA_MVS_SPAG_S_STR-AVGMVSUTL sy-vline 
WA_MVS_SPAG_S_STR-PG_IN sy-vline 
WA_MVS_SPAG_S_STR-PG_OUT sy-vline 
WA_MVS_SPAG_S_STR-PG_IN_PRV sy-vline 
WA_MVS_SPAG_S_STR-PG_OT_PRV sy-vline 
WA_MVS_SPAG_S_STR-PG_TO_EXST sy-vline 
WA_MVS_SPAG_S_STR-PG_FR_EXST sy-vline 
WA_MVS_SPAG_S_STR-PG_IN_BLCK sy-vline 
WA_MVS_SPAG_S_STR-PG_IN_BNUM sy-vline 
WA_MVS_SPAG_S_STR-RESERV1 sy-vline 
WA_MVS_SPAG_S_STR-RESERV2 sy-vline 
WA_MVS_SPAG_S_STR-RESERV3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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