Struct xpcom::interfaces::mozIStorageAggregateFunction

#[repr(C)]
pub struct mozIStorageAggregateFunction { /* fields omitted */ }

interface mozIStorageAggregateFunction : nsISupports

/**
 * mozIStorageAggregateFunction represents aggregate SQL function.
 * Common examples of aggregate functions are SUM() and COUNT().
 *
 * An aggregate function calculates one result for a given set of data, where
 * a set of data is a group of tuples. There can be one group
 * per request or many of them, if GROUP BY clause is used or not.
 */

Methods

impl mozIStorageAggregateFunction

pub fn coerce<T: mozIStorageAggregateFunctionCoerce>(&self) -> &T

Cast this mozIStorageAggregateFunction to one of its base interfaces.

impl mozIStorageAggregateFunction

pub unsafe fn OnStep(
    &self,
    aFunctionArguments: *const mozIStorageValueArray
) -> nsresult

/**
   * onStep is called when next value should be passed to
   * a custom function.
   *
   * @param aFunctionArguments    The arguments passed in to the function
   */

void onStep (in mozIStorageValueArray aFunctionArguments);

pub unsafe fn OnFinal(&self, _retval: *mut *const nsIVariant) -> nsresult

/**
   * Called when all tuples in a group have been processed and the engine
   * needs the aggregate function's value.
   *
   * @returns aggregate result as Variant.
   */

nsIVariant onFinal ();

Methods from Deref<Target = nsISupports>

pub fn coerce<T: nsISupportsCoerce>(&self) -> &T

Cast this nsISupports to one of its base interfaces.

pub unsafe fn QueryInterface(
    &self,
    uuid: &nsIID,
    result: *mut *mut c_void
) -> nsresult

void QueryInterface (in nsIIDRef uuid, [iid_is (uuid), retval] out nsQIResult result);

pub unsafe fn AddRef(&self) -> nsrefcnt

[noscript,notxpcom] nsrefcnt AddRef ();

pub unsafe fn Release(&self) -> nsrefcnt

[noscript,notxpcom] nsrefcnt Release ();

Trait Implementations

impl XpCom for mozIStorageAggregateFunction

const IID: nsIID

IID: nsIID = nsID(1982994359, 12579, 4570, [145, 141, 0, 3, 71, 65, 46, 22])

fn query_interface<T: XpCom>(&self) -> Option<RefPtr<T>>

Perform a QueryInterface call on this object, attempting to dynamically cast it to the requested interface type. Returns Some(RefPtr) if the cast succeeded, and None otherwise.

impl RefCounted for mozIStorageAggregateFunction

unsafe fn addref(&self)

Increment the reference count.

unsafe fn release(&self)

Decrement the reference count, potentially freeing backing memory.

impl Deref for mozIStorageAggregateFunction

type Target = nsISupports

The resulting type after dereferencing.

fn deref(&self) -> &nsISupports

Dereferences the value.