CDS Conversion Functions (CAST, Unit Conversion, Currency Conversion)

CAST Expression

Supported Operands: Literal, column, path expression, build-in function, arithmetic expression

• Various data types in ABAP namespace supported
• Result length determined at activation time
• No nesting of CAST expressions
• Alias names required for resulting columns

Example:
Cast foreign currency amount from sbook as reduced_amount and Savings

@AbapCatalog.sqlViewName: 'Zcds_cast_sql'
define view Zcds_cast as select from sbook
{
  forcurkey,
  forcuram as Amount,
  cast( forcuram as abap.fltp ) + ( cast ( -forcuram as abap.fltp ) * 0.03 ) as ReducedAmount,
  cast( forcuram as abap.fltp )* 0.03 as Savings
}

Unit Conversion

The function UNIT_CONVERSION performs a unit conversion for the value passed to the formal parameter quantity.

@AbapCatalog.sqlViewName: 'zcds_unit_sql'
define view zcds_unit as select from sbook
{
  bookid,
  unit_conversion (
    quantity => luggweight,
    source_unit => wunit,
    target_unit => cast( 'G' as abap.unit ) ) as `Weight_In_Grams
}

Currency Conversion

The function CURRENCY_CONVERSION performs a currency conversion for the value passed to the formal parameter amount.

@AbapCatalog.sqlViewName: 'zcds_curr _sql'
@ClientDependent: true
define view zcds_curr as select from sbook
{
 currency_conversion(
    amount => loccuram,
    source_currency => loccurkey,
    target_currency => cast('EUR' as abap.cuky(5)),
    exchange_rate_date => order_date ) as euro_amount
}