org.objectweb.medor.datasource.rdb.lib
Class JDBCWrapper

java.lang.Object
  org.objectweb.medor.datasource.rdb.lib.JDBCWrapper

All Implemented Interfaces:

Wrapper

public class JDBCWrapper

extends java.lang.Object

implements Wrapper

This class implements the Wrapper interface for the jdbc resources. This implementation uses Statements to perform the request.

Author:

Mourad Alia

Constructor Summary

JDBCWrapper()

Method Summary

TupleCollection

fetchData(QueryLeaf lf, 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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JDBCWrapper

public JDBCWrapper()

Method Detail

fetchData

public TupleCollection fetchData(QueryLeaf lf,
                                 ParameterOperand[] parameters,
                                 java.lang.Object connection,
                                 EvaluationMetaData evalMD)
                          throws EvaluationException

Description copied from interface: Wrapper

This method links the wrapper to a particular QueryLeaf, and executes the query on the underlying data store.

Specified by:

fetchData in interface Wrapper

Parameters:

lf - the QueryLeaf

parameters - 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

Returns:

the TupleCollection containing the result of the execution.

Throws:

EvaluationException - in case of problems during the evaluation.