mozIStorageAggregateFunction
| IID: | 763217b7-3123-11da-918d-000347412e16 |
| Inherits From: | 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
nsIVariant onFinal ( )
void onStep ( mozIStorageValueArray functionArguments )
nsIVariant onFinal ( )
Called when all tuples in a group have been processed and the engine needs the aggregate function's value.
void onStep ( mozIStorageValueArray functionArguments )
OnStep is called when next value should be passed to a custom function.
- Arguments:
- functionArguments: The arguments passed in to the function
References
This interface is passed as an argument to the following methods:
mozIStorageConnection.createAggregateFunction
Reference documentation is generated from Mozilla's source.