ABAP Select data from SAP table OVERVW_LIB_CACHE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OVERVW_LIB_CACHE
*  INTO TABLE @DATA(IT_OVERVW_LIB_CACHE2).
*--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_OVERVW_LIB_CACHE INDEX 1 INTO DATA(WA_OVERVW_LIB_CACHE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OVERVW_LIB_CACHE>-INST_ID = 1.
<OVERVW_LIB_CACHE>-NAMESPACE = 1.
<OVERVW_LIB_CACHE>-GETS = 1.
<OVERVW_LIB_CACHE>-GETHITS = 1.
<OVERVW_LIB_CACHE>-GETHITRATIO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OVERVW_LIB_CACHE-PINS, sy-vline,
  WA_OVERVW_LIB_CACHE-PINHITS, sy-vline,
  WA_OVERVW_LIB_CACHE-PINHITRATIO, sy-vline,
  WA_OVERVW_LIB_CACHE-RELOADS, sy-vline,
  WA_OVERVW_LIB_CACHE-INVALIDATIONS, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_OVERVW_LIB_CACHE 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_OVERVW_LIB_CACHE 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_OVERVW_LIB_CACHE INTO WA_OVERVW_LIB_CACHE.


*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_OVERVW_LIB_CACHE_STR, 
INST_ID TYPE STRING,
NAMESPACE TYPE STRING,
GETS TYPE STRING,
GETHITS TYPE STRING,
GETHITRATIO TYPE STRING,
PINS TYPE STRING,
PINHITS TYPE STRING,
PINHITRATIO TYPE STRING,
RELOADS TYPE STRING,
INVALIDATIONS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OVERVW_LIB_CACHE_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_OVERVW_LIB_CACHE_STR-INST_ID sy-vline 
WA_OVERVW_LIB_CACHE_STR-NAMESPACE sy-vline 
WA_OVERVW_LIB_CACHE_STR-GETS sy-vline 
WA_OVERVW_LIB_CACHE_STR-GETHITS sy-vline 
WA_OVERVW_LIB_CACHE_STR-GETHITRATIO sy-vline 
WA_OVERVW_LIB_CACHE_STR-PINS sy-vline 
WA_OVERVW_LIB_CACHE_STR-PINHITS sy-vline 
WA_OVERVW_LIB_CACHE_STR-PINHITRATIO sy-vline 
WA_OVERVW_LIB_CACHE_STR-RELOADS sy-vline 
WA_OVERVW_LIB_CACHE_STR-INVALIDATIONS sy-vline      INTO ld_text SEPARATED BY SPACE.

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