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The Result object in the Polypheny JDBC Multimodel Extension encapsulates the outcome of queries executed using the PolyStatement object. It serves as a wrapper for different types of results such as RelationalResult, DocumentResult, GraphResult, and ScalarResult.
getResultType
public ResultType getResultType()
Returns the type of the encapsulated result.
Return Type:
- Returns one of the following
ResultTypeconstants:Result.RELATIONAL,Result.DOCUMENT,Result.GRAPH,Result.SCALAR.
Usage:
ResultType type = result.getResultType();
unwrap
public <T> T unwrap(Class<T> aClass) throws ProtoInterfaceServiceException
Unwraps the encapsulated result to its specific type, based on the type parameter passed to the unwrap method.
Parameters:
| Parameter | Type | Description |
|---|---|---|
aClass |
Class<T> |
The class to which the result should be unwrapped. |
Return Type:
Returns an instance of the specified class.
Exceptions:
Throws a ProtoInterfaceServiceException if the result cannot be unwrapped to the specified class type.
Result Types:
| Result Type | Unwrap To | Description |
|---|---|---|
Result.RELATIONAL |
RelationalResult.class |
The result contains relational data and can be unwrapped to a RelationalResult object. |
Result.DOCUMENT |
DocumentResult.class |
The result contains document-based data and can be unwrapped to a DocumentResult object. |
Result.GRAPH |
GraphResult.class |
The result contains graph-based data and can be unwrapped to a GraphResult object. |
Result.SCALAR |
ScalarResult.class |
The result contains scalar values and can be unwrapped to a ScalarResult object. |
Usage:
try {
switch (result.getResultType()) {
case Result.RELATIONAL:
RelationalResult relationalResult = result.unwrap(RelationalResult.class);
// Process the relational result...
break;
case Result.DOCUMENT:
DocumentResult documentResult = result.unwrap(DocumentResult.class);
// Process the document result...
break;
case Result.GRAPH:
GraphResult graphResult = result.unwrap(GraphResult.class);
// Process the graph result...
break;
case Result.SCALAR:
ScalarResult scalarResult = result.unwrap(ScalarResult.class);
// Process the scalar result...
break;
default:
// Handle other types...
}
} catch (ProtoInterfaceServiceException e) {
e.printStackTrace();
}
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