AggregateFunctionA user-defined aggregate function needs to implement this interface. The class must be public and must have a public non-argument constructor.
void add(Object value) throws SQLExceptionThis method is called once for each row. If the aggregate function is called with multiple parameters, those are passed as array.Parameters:
value - the value(s) for this row
Object getResult() throws SQLExceptionThis method returns the computed aggregate value.Returns:
the aggregated value
int getType(int[] inputType) throws SQLExceptionThis method must return the SQL type of the method, given the SQL type of the input data. The method should check here if the number of parameters passed is correct, and if not it should throw an exception.Parameters:
inputType - the SQL type of the parameters
Returns:
the SQL type of the result
void init(Connection conn) throws SQLExceptionThis method is called when the aggregate function is used. A new object is created for each invocation.Parameters:
conn - a connection to the database
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