JRQueryExecuter (JasperReports Javadoc 7.0.0 API)

All Known Implementing Classes:

AbstractJsonQueryExecuter, AbstractXlsQueryExecuter, ExcelQueryExecuter, JaxenXPathQueryExecuter, JRAbstractQueryExecuter, JRCsvQueryExecuter, JREmptyQueryExecuter, JRHibernateQueryExecuter, JRHibernateQueryExecuter, JRJdbcQueryExecuter, JRJpaQueryExecuter, JRJpaQueryExecuter, JRMondrianQueryExecuter, JRXlsxQueryExecuter, JRXmlaQueryExecuter, JRXPathQueryExecuter, JsonQLQueryExecuter, JsonQueryExecuter, Olap4jMondrianQueryExecuter, Olap4jXmlaQueryExecuter, XalanXPathQueryExecuter, XlsQueryExecuter
```
public interface JRQueryExecuter
```
Query executer interface.
An implementation of this interface is created when the input data of a report/dataset is specified by a query.
The implementation will run the query and create a JRDataSource from the result.
The query executers would usually be initialized by a QueryExecuterFactory with the query and the parameter values.

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

See Also:

QueryExecuterFactory

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`cancelQuery()`	Cancels the query if it's currently running.
`void`	`close()`	Closes resources kept open during the data source iteration.
`JRDataSource`	`createDatasource()`	Executes the query and creates a `JRDataSource` out of the result.

- Method Detail
  - createDatasource
```
JRDataSource createDatasource()
                       throws JRException
```
    Executes the query and creates a JRDataSource out of the result.
    
    Returns:
    
    a JRDataSource wrapping the query execution result.
    
    Throws:
    
    JRException
  - close
```
void close()
```
    Closes resources kept open during the data source iteration.
    This method is called after the report is filled or the dataset is iterated. If a resource is not needed after the data source has been created, it should be released at the end of createDatasource.
  - cancelQuery
```
boolean cancelQuery()
             throws JRException
```
    Cancels the query if it's currently running.
    This method will be called from a different thread if the client decides to cancel the filling process.
    
    Returns:
    
    true if and only if the query was running and it has been canceled
    
    Throws:
    
    JRException