Package org.exolab.castor.jdo
Interface OQLQuery
- All Superinterfaces:
Query
- All Known Implementing Classes:
OQLQueryImpl
An OQL query object. Obtained from the database and used to
construct and execute a query on that database. All query operations
are bound to the database transaction. Closing the database or the
transaction will effectively close the query.
If the query specified parameters these parameters must be set
(bound) before executing the query. Execution of the query will
result in an enumeration of all the objects found by the query.
The query can be re-executed by binding new parameters and calling
the Query.execute()
method a second time. A query can be
re-execute while objects are still retrieved from a previous
execution.
For example:
Query oql; QueryResults results; // Construct a new query and bind the id value oql = db.getQuery( "SELECT ... WHERE id=$1" ); oql.bind( 5 ); results = oql.execute(); // Iterate over all the results and print them while ( results.hasMore() ) { System.out.println( results.next(); ); } results.close(); oql.close();
- Version:
- $Revision: 7091 $ $Date: 2004-10-01 14:44:12 -0600 (Fri, 01 Oct 2004) $
- Author:
- Assaf Arkin
- See Also:
-
Method Summary
-
Method Details
-
create
Creates an OQL query from the supplied statement.- Parameters:
query
- An OQL query statement- Throws:
PersistenceException
-