use of org.datanucleus.store.rdbms.query.PersistentClassROF in project datanucleus-rdbms by datanucleus.
the class MapValueCollectionStore method iterator.
/**
* Accessor for an iterator for the set.
* @param ownerOP ObjectProvider for the set.
* @return Iterator for the set.
*/
public Iterator<V> iterator(ObjectProvider ownerOP) {
ExecutionContext ec = ownerOP.getExecutionContext();
if (iteratorStmtLocked == null) {
synchronized (// Make sure this completes in case another thread needs the same info
this) {
// Generate the statement, and statement mapping/parameter information
SQLStatement sqlStmt = getSQLStatementForIterator(ownerOP);
iteratorStmtUnlocked = sqlStmt.getSQLText().toSQL();
sqlStmt.addExtension(SQLStatement.EXTENSION_LOCK_FOR_UPDATE, true);
iteratorStmtLocked = sqlStmt.getSQLText().toSQL();
}
}
Transaction tx = ec.getTransaction();
String stmt = (tx.getSerializeRead() != null && tx.getSerializeRead() ? iteratorStmtLocked : iteratorStmtUnlocked);
try {
ManagedConnection mconn = storeMgr.getConnectionManager().getConnection(ec);
SQLController sqlControl = storeMgr.getSQLController();
try {
// Create the statement and set the owner
PreparedStatement ps = sqlControl.getStatementForQuery(mconn, stmt);
StatementMappingIndex ownerIdx = iteratorMappingParams.getMappingForParameter("owner");
int numParams = ownerIdx.getNumberOfParameterOccurrences();
for (int paramInstance = 0; paramInstance < numParams; paramInstance++) {
ownerIdx.getMapping().setObject(ec, ps, ownerIdx.getParameterPositionsForOccurrence(paramInstance), ownerOP.getObject());
}
try {
ResultSet rs = sqlControl.executeStatementQuery(ec, mconn, stmt, ps);
try {
ResultObjectFactory rof = null;
if (elementsAreEmbedded || elementsAreSerialised) {
// No ResultObjectFactory needed - handled by SetStoreIterator
return new CollectionStoreIterator(ownerOP, rs, null, this);
}
rof = new PersistentClassROF(ec, rs, false, iteratorMappingDef, elementCmd, clr.classForName(elementType));
return new CollectionStoreIterator(ownerOP, rs, rof, this);
} finally {
rs.close();
}
} finally {
sqlControl.closeStatement(mconn, ps);
}
} finally {
mconn.release();
}
} catch (SQLException e) {
throw new NucleusDataStoreException(Localiser.msg("056006", stmt), e);
} catch (MappedDatastoreException e) {
throw new NucleusDataStoreException(Localiser.msg("056006", stmt), e);
}
}
Aggregations