Package org.exolab.castor.jdo
Interface QueryResults
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- All Superinterfaces:
java.util.Enumeration<java.lang.Object>
- All Known Implementing Classes:
OQLQueryImpl.OQLEnumeration
,SimpleQueryExecutor.SimpleQueryResults
public interface QueryResults extends java.util.Enumeration<java.lang.Object>
An iteration of the results of a query. This interface provides the ability to move forward only in the result set and pick the next result and close it.- Version:
- $Revision: 8141 $ $Date: 2004-05-03 16:05:30 -0600 (Mon, 03 May 2004) $
- Author:
- Assaf Arkin
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description boolean
absolute(int row)
moves the result of the query to the absolute position in the resultset.void
close()
Closes the result set and releases all resources held by it.boolean
hasMore()
Returns true if there are any more results in the result set.java.lang.Object
next()
Returns the next result in the result set.int
size()
Finds the size of the resulting resultset from the query.
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Method Detail
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hasMore
boolean hasMore() throws PersistenceException
Returns true if there are any more results in the result set. If an error occured reading the last result, an exception will be thrown and the result set cannot be used further.- Returns:
- True if there are any more results in the result set
- Throws:
PersistenceException
- An error with the persistence engine
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next
java.lang.Object next() throws PersistenceException, java.util.NoSuchElementException
Returns the next result in the result set. If there are no more results (a previous cal tohasMore()
returns false) this method will throw an exceptin. If an error occured reading the last result, an exception will be thrown and the result set cannot be used further.- Returns:
- The next result in the result set
- Throws:
PersistenceException
- An error with the persistence enginejava.util.NoSuchElementException
- There are no more results in the result set
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close
void close()
Closes the result set and releases all resources held by it.
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absolute
boolean absolute(int row) throws PersistenceException
moves the result of the query to the absolute position in the resultset.- Parameters:
row
- The row to move to- Returns:
- ???
- Throws:
PersistenceException
- A persistence error occured
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size
int size() throws PersistenceException
Finds the size of the resulting resultset from the query.- Returns:
- Size of the resulting result set.
- Throws:
PersistenceException
- A persistence error occured
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