Class SQLDataSource

java.lang.Object

fr.inria.rules.integraal.views.datasource.AbstractDataSource<String, List<Object[]>>

fr.inria.rules.integraal.views.datasource.SQLDataSource

All Implemented Interfaces:

QueryableData, DataSource<String, List<Object[]>>

public class SQLDataSource
extends AbstractDataSource<String, List<Object[]>>

Access to a datasource using SQL queries

Author:

Florent Tornil

Constructor Summary

Constructors

Constructor	Description
SQLDataSource(RDBMSDriver driver)	Create a new datasource on a RDBMS

Method Summary

Modifier and Type	Method	Description
Optional<Long>	estimateBound(BasicQuery query)	Estimate the number of answers to a query The estimation is the upper bound, meaning the actual number of answers will not exceed this number.
Collection<OperationsSupported>	getSupportedOperations()

Methods inherited from class AbstractDataSource

evaluate, evaluate, getAtomicPattern, getName, getPredicates, getViewParameters, hasPredicate, registerView, setName

Methods inherited from class Object

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

Methods inherited from interface QueryableData

estimateBound

Constructor Details

SQLDataSource

public SQLDataSource(RDBMSDriver driver)
              throws SQLException

Create a new datasource on a RDBMS

Parameters:

driver - the SQL driver

Throws:

SQLException - if an error occur

Method Details

estimateBound

public Optional<Long> estimateBound(BasicQuery query)

Description copied from interface: QueryableData

Estimate the number of answers to a query The estimation is the upper bound, meaning the actual number of answers will not exceed this number. Implementations may return an empty Optional if they cannot provide an estimation.

Specified by:

estimateBound in interface QueryableData

Overrides:

estimateBound in class AbstractDataSource<String, List<Object[]>>

Parameters:

query - the query for which we want to know the upper bound

Returns:

an Optional containing the estimated upper bound of answers, or an empty Optional if estimation is not possible

getSupportedOperations

public Collection<OperationsSupported> getSupportedOperations()

Returns:

the set of operations and optimizations that are supported by the datasource