ABAP Select data from SAP table MSS_STMTHIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSS_STMTHIST
*  INTO TABLE @DATA(IT_MSS_STMTHIST2).
*--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_MSS_STMTHIST INDEX 1 INTO DATA(WA_MSS_STMTHIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSS_STMTHIST>-COLL_ID = 1.
<MSS_STMTHIST>-START_DT = 1.
<MSS_STMTHIST>-START_TM = 1.
<MSS_STMTHIST>-SEC_SINCE = 1.
<MSS_STMTHIST>-CALLS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSS_STMTHIST-PHYSRD, sy-vline,
  WA_MSS_STMTHIST-LOGRD, sy-vline,
  WA_MSS_STMTHIST-LOGWRT, sy-vline,
  WA_MSS_STMTHIST-ELPST, sy-vline,
  WA_MSS_STMTHIST-CPU, sy-vline,
  WA_MSS_STMTHIST-WAITRATIO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSS_STMTHIST 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_MSS_STMTHIST 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_MSS_STMTHIST INTO WA_MSS_STMTHIST.


*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_MSS_STMTHIST_STR, 
COLL_ID TYPE STRING,
START_DT TYPE STRING,
START_TM TYPE STRING,
SEC_SINCE TYPE STRING,
CALLS TYPE STRING,
PHYSRD TYPE STRING,
LOGRD TYPE STRING,
LOGWRT TYPE STRING,
ELPST TYPE STRING,
CPU TYPE STRING,
WAITRATIO TYPE STRING,
DCACHESZ TYPE STRING,
DCACHEHR TYPE STRING,
PCACHESZ TYPE STRING,
PCACHEHR TYPE STRING,
PLE TYPE STRING,
PLOOKUPPERBATCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSS_STMTHIST_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_MSS_STMTHIST_STR-COLL_ID sy-vline 
WA_MSS_STMTHIST_STR-START_DT sy-vline 
WA_MSS_STMTHIST_STR-START_TM sy-vline 
WA_MSS_STMTHIST_STR-SEC_SINCE sy-vline 
WA_MSS_STMTHIST_STR-CALLS sy-vline 
WA_MSS_STMTHIST_STR-PHYSRD sy-vline 
WA_MSS_STMTHIST_STR-LOGRD sy-vline 
WA_MSS_STMTHIST_STR-LOGWRT sy-vline 
WA_MSS_STMTHIST_STR-ELPST sy-vline 
WA_MSS_STMTHIST_STR-CPU sy-vline 
WA_MSS_STMTHIST_STR-WAITRATIO sy-vline 
WA_MSS_STMTHIST_STR-DCACHESZ sy-vline 
WA_MSS_STMTHIST_STR-DCACHEHR sy-vline 
WA_MSS_STMTHIST_STR-PCACHESZ sy-vline 
WA_MSS_STMTHIST_STR-PCACHEHR sy-vline 
WA_MSS_STMTHIST_STR-PLE sy-vline 
WA_MSS_STMTHIST_STR-PLOOKUPPERBATCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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