ABAP Select data from SAP table MSS_REQHIST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSS_REQHIST 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_REQHIST. 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_REQHIST 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_REQHIST TYPE STANDARD TABLE OF MSS_REQHIST,
      WA_MSS_REQHIST TYPE MSS_REQHIST,
      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_REQHIST> TYPE MSS_REQHIST.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSS_REQHIST
*  INTO TABLE @DATA(IT_MSS_REQHIST2).
*--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_REQHIST INDEX 1 INTO DATA(WA_MSS_REQHIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSS_REQHIST>-SRH_ID = 1.
<MSS_REQHIST>-COLLDT = 1.
<MSS_REQHIST>-COLLTM = 1.
<MSS_REQHIST>-SESSID = 1.
<MSS_REQHIST>-HOSTNM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSS_REQHIST-PROGNM, sy-vline,
  WA_MSS_REQHIST-STRTDT, sy-vline,
  WA_MSS_REQHIST-STRTTM, sy-vline,
  WA_MSS_REQHIST-SQLTXT, sy-vline,
  WA_MSS_REQHIST-CMD, sy-vline,
  WA_MSS_REQHIST-BLKSESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSS_REQHIST 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_REQHIST 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_REQHIST INTO WA_MSS_REQHIST.


*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_REQHIST_STR, 
SRH_ID TYPE STRING,
COLLDT TYPE STRING,
COLLTM TYPE STRING,
SESSID TYPE STRING,
HOSTNM TYPE STRING,
PROGNM TYPE STRING,
STRTDT TYPE STRING,
STRTTM TYPE STRING,
SQLTXT TYPE STRING,
CMD TYPE STRING,
BLKSESS TYPE STRING,
WAITTYP TYPE STRING,
WAITRES TYPE STRING,
WAITTIME TYPE STRING,
CPUTIME TYPE STRING,
TTL_ELAPSED TYPE STRING,
SQLCPUPCT TYPE STRING,
DWRITMSIO TYPE STRING,
LWRITMSIO TYPE STRING,
DREADMSIO TYPE STRING,
LREADMSIO TYPE STRING,
OBJ_NAME TYPE STRING,
ABAP_NAME TYPE STRING,
ABAP_LOC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSS_REQHIST_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_REQHIST_STR-SRH_ID sy-vline 
WA_MSS_REQHIST_STR-COLLDT sy-vline 
WA_MSS_REQHIST_STR-COLLTM sy-vline 
WA_MSS_REQHIST_STR-SESSID sy-vline 
WA_MSS_REQHIST_STR-HOSTNM sy-vline 
WA_MSS_REQHIST_STR-PROGNM sy-vline 
WA_MSS_REQHIST_STR-STRTDT sy-vline 
WA_MSS_REQHIST_STR-STRTTM sy-vline 
WA_MSS_REQHIST_STR-SQLTXT sy-vline 
WA_MSS_REQHIST_STR-CMD sy-vline 
WA_MSS_REQHIST_STR-BLKSESS sy-vline 
WA_MSS_REQHIST_STR-WAITTYP sy-vline 
WA_MSS_REQHIST_STR-WAITRES sy-vline 
WA_MSS_REQHIST_STR-WAITTIME sy-vline 
WA_MSS_REQHIST_STR-CPUTIME sy-vline 
WA_MSS_REQHIST_STR-TTL_ELAPSED sy-vline 
WA_MSS_REQHIST_STR-SQLCPUPCT sy-vline 
WA_MSS_REQHIST_STR-DWRITMSIO sy-vline 
WA_MSS_REQHIST_STR-LWRITMSIO sy-vline 
WA_MSS_REQHIST_STR-DREADMSIO sy-vline 
WA_MSS_REQHIST_STR-LREADMSIO sy-vline 
WA_MSS_REQHIST_STR-OBJ_NAME sy-vline 
WA_MSS_REQHIST_STR-ABAP_NAME sy-vline 
WA_MSS_REQHIST_STR-ABAP_LOC sy-vline      INTO ld_text SEPARATED BY SPACE.

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