ABAP Select data from SAP table /CFG/V_HASH into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CFG/V_HASH 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 /CFG/V_HASH. 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 /CFG/V_HASH 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_/CFG/V_HASH TYPE STANDARD TABLE OF /CFG/V_HASH,
      WA_/CFG/V_HASH TYPE /CFG/V_HASH,
      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: </CFG/V_HASH> TYPE /CFG/V_HASH.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /CFG/V_HASH
  INTO TABLE IT_/CFG/V_HASH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CFG/V_HASH
*  INTO TABLE @DATA(IT_/CFG/V_HASH2).
*--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_/CFG/V_HASH INDEX 1 INTO DATA(WA_/CFG/V_HASH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/CFG/V_HASH ASSIGNING </CFG/V_HASH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CFG/V_HASH>-MANDT = 1.
</CFG/V_HASH>-SOLUTION_ID = 1.
</CFG/V_HASH>-ACTID = 1.
</CFG/V_HASH>-CUSTOBJ_TY = 1.
</CFG/V_HASH>-CUST_OBJ = 1.

ENDLOOP.

LOOP AT IT_/CFG/V_HASH INTO WA_/CFG/V_HASH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CFG/V_HASH-SUBOBJNAME, sy-vline,
  WA_/CFG/V_HASH-TABNAME, sy-vline,
  WA_/CFG/V_HASH-TABCLASS, sy-vline,
  WA_/CFG/V_HASH-DEL_CLASS, sy-vline,
  WA_/CFG/V_HASH-FLDNAME, sy-vline,
  WA_/CFG/V_HASH-KEYFLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CFG/V_HASH 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_/CFG/V_HASH 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_/CFG/V_HASH INTO WA_/CFG/V_HASH.


*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.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/CFG/V_HASH-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CFG/V_HASH-DATATYPE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/CFG/V_HASH_STR, 
MANDT TYPE STRING,
SOLUTION_ID TYPE STRING,
ACTID TYPE STRING,
CUSTOBJ_TY TYPE STRING,
CUST_OBJ TYPE STRING,
SUBOBJNAME TYPE STRING,
TABNAME TYPE STRING,
TABCLASS TYPE STRING,
DEL_CLASS TYPE STRING,
FLDNAME TYPE STRING,
KEYFLAG TYPE STRING,
CHKTABL TYPE STRING,
HLP_IND TYPE STRING,
DATATYPE TYPE STRING,
VAL_TABL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CFG/V_HASH_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_/CFG/V_HASH_STR-MANDT sy-vline 
WA_/CFG/V_HASH_STR-SOLUTION_ID sy-vline 
WA_/CFG/V_HASH_STR-ACTID sy-vline 
WA_/CFG/V_HASH_STR-CUSTOBJ_TY sy-vline 
WA_/CFG/V_HASH_STR-CUST_OBJ sy-vline 
WA_/CFG/V_HASH_STR-SUBOBJNAME sy-vline 
WA_/CFG/V_HASH_STR-TABNAME sy-vline 
WA_/CFG/V_HASH_STR-TABCLASS sy-vline 
WA_/CFG/V_HASH_STR-DEL_CLASS sy-vline 
WA_/CFG/V_HASH_STR-FLDNAME sy-vline 
WA_/CFG/V_HASH_STR-KEYFLAG sy-vline 
WA_/CFG/V_HASH_STR-CHKTABL sy-vline 
WA_/CFG/V_HASH_STR-HLP_IND sy-vline 
WA_/CFG/V_HASH_STR-DATATYPE sy-vline 
WA_/CFG/V_HASH_STR-VAL_TABL sy-vline      INTO ld_text SEPARATED BY SPACE.

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