ABAP Select data from SAP table MSQSHCONTG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSQSHCONTG
*  INTO TABLE @DATA(IT_MSQSHCONTG2).
*--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_MSQSHCONTG INDEX 1 INTO DATA(WA_MSQSHCONTG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSQSHCONTG>-OBJNAME = 1.
<MSQSHCONTG>-OBJID = 1.
<MSQSHCONTG>-INDEXNAME = 1.
<MSQSHCONTG>-INDEXID = 1.
<MSQSHCONTG>-INDEXLEVEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSQSHCONTG-CNTPAGES, sy-vline,
  WA_MSQSHCONTG-CNTROWS, sy-vline,
  WA_MSQSHCONTG-MINRECSIZE, sy-vline,
  WA_MSQSHCONTG-MAXRECSIZE, sy-vline,
  WA_MSQSHCONTG-AVGRECSIZE, sy-vline,
  WA_MSQSHCONTG-FORWARDREC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSQSHCONTG 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_MSQSHCONTG 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_MSQSHCONTG INTO WA_MSQSHCONTG.


*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_MSQSHCONTG_STR, 
OBJNAME TYPE STRING,
OBJID TYPE STRING,
INDEXNAME TYPE STRING,
INDEXID TYPE STRING,
INDEXLEVEL TYPE STRING,
CNTPAGES TYPE STRING,
CNTROWS TYPE STRING,
MINRECSIZE TYPE STRING,
MAXRECSIZE TYPE STRING,
AVGRECSIZE TYPE STRING,
FORWARDREC TYPE STRING,
EXTENTS TYPE STRING,
EXTSWITCH TYPE STRING,
AVGFRBYTES TYPE STRING,
AVGPGDENS TYPE STRING,
SCANDNSITY TYPE STRING,
BESTEXTCNT TYPE STRING,
ACTEXTCNT TYPE STRING,
LOGIFRAG TYPE STRING,
EXTFRAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSQSHCONTG_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_MSQSHCONTG_STR-OBJNAME sy-vline 
WA_MSQSHCONTG_STR-OBJID sy-vline 
WA_MSQSHCONTG_STR-INDEXNAME sy-vline 
WA_MSQSHCONTG_STR-INDEXID sy-vline 
WA_MSQSHCONTG_STR-INDEXLEVEL sy-vline 
WA_MSQSHCONTG_STR-CNTPAGES sy-vline 
WA_MSQSHCONTG_STR-CNTROWS sy-vline 
WA_MSQSHCONTG_STR-MINRECSIZE sy-vline 
WA_MSQSHCONTG_STR-MAXRECSIZE sy-vline 
WA_MSQSHCONTG_STR-AVGRECSIZE sy-vline 
WA_MSQSHCONTG_STR-FORWARDREC sy-vline 
WA_MSQSHCONTG_STR-EXTENTS sy-vline 
WA_MSQSHCONTG_STR-EXTSWITCH sy-vline 
WA_MSQSHCONTG_STR-AVGFRBYTES sy-vline 
WA_MSQSHCONTG_STR-AVGPGDENS sy-vline 
WA_MSQSHCONTG_STR-SCANDNSITY sy-vline 
WA_MSQSHCONTG_STR-BESTEXTCNT sy-vline 
WA_MSQSHCONTG_STR-ACTEXTCNT sy-vline 
WA_MSQSHCONTG_STR-LOGIFRAG sy-vline 
WA_MSQSHCONTG_STR-EXTFRAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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