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Represents a wrapper to access data from a QueryLeaf at query evaluation time.
A Wrapper is associated to a QueryLeaf at a given point of time. There can be several Wrappers of the same type. One Wrapper can be associated sequentially to several QueryLeaves.
Method Summary | |
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TupleCollection |
fetchData(QueryLeaf ql,
ParameterOperand[] parameters,
java.lang.Object connection,
EvaluationMetaData evalmd)
This method links the wrapper to a particular QueryLeaf, and executes the query on the underlying data store. |
Method Detail |
public TupleCollection fetchData(QueryLeaf ql, ParameterOperand[] parameters, java.lang.Object connection, EvaluationMetaData evalmd) throws EvaluationException
ql
- the QueryLeafparameters
- the parameters necessary for obtaining data from the
QueryLeaf (in the case the QueryLeaf contains an expression)connection
- an Object which contains information for connecting
to the DataStore behind the QueryLeaf (could be a JDBC connection, ...)s
EvaluationException
- in case of problems during the evaluation.
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