Ingres interactions with transactions
-------------------------------------
Key: CAY-1661
URL: https://issues.apache.org/jira/browse/CAY-1661
Project: Cayenne
Issue Type: Bug
Components: Database integration
Affects Versions: 3.0.2
Environment: Ingres 10 64 bit for Linux, client is freebsd 9 with
openjdk 6, cayenne 3.0.2
Reporter: Lucas Holt
Priority: Minor
I've written some code to insert new records using a SQLTemplate (as I can't
use new object, see other bug) and noticed that I must explicitly create a new
transaction in order for the code to work. The code block starts with a result
iterator and if i do not explicitly create transactions inside the loop, the
program terminates early with the result iterator after about 24 rows (there
are over a million).
Ingres doesn't have auto commit by default and I'm wondering if this is the
problem. (Even select's need commit)
The insert piece is just a normal sqltemplate call on the same thread. I'll
include the code below that loops:
public void generate() throws CayenneException, ServiceException {
DataContext context;
context = (DataContext) BaseContext.getThreadObjectContext();
context.setValidatingObjectsOnCommit(false);
DataDomain domain = Configuration.getSharedConfiguration().getDomain();
SelectQuery query;
Expression qualifier;
if (!update) {
qualifier = Expression.fromString("variationMeta+.lastName = $vm
and msnNameVarList.indivId > 0");
HashMap<String, String> map = new HashMap<String, String>();
map.put("vm", null);
qualifier = qualifier.expWithParameters(map);
} else {
qualifier = Expression.fromString("msnNameVarList.indivId > 0");
}
query = new SelectQuery(MsnVariation.class, qualifier);
query.setStatementFetchSize(1000);
query.setCacheStrategy(QueryCacheStrategy.NO_CACHE);
ResultIterator it = context.performIteratedQuery(query);
try {
while (it.hasNextRow()) {
Transaction tx = domain.createTransaction();
Transaction.bindThreadTransaction(tx);
tx.setStatus(Transaction.STATUS_ACTIVE);
try {
MsnVariation variation =
context.objectFromDataRow(MsnVariation.class, (DataRow) it.nextRow(), false);
if (variation == null) {
log.error("variation is null?");
continue;
}
if (verbose) {
System.out.println("Var: " +
DataObjectUtils.intPKForObject(variation) + ": " + variation.getNameTxt());
}
if (variation.getVariationMeta() == null) {
variationService.createMeta(variation);
} else if (update) {
variationService.updateMeta(variation);
}
tx.commit();
} catch (Exception ex) {
log.error(ex);
tx.setRollbackOnly();
} finally {
if (tx.getStatus() == Transaction.STATUS_MARKED_ROLLEDBACK)
{
try {
tx.rollback();
} catch (Exception rollbackEx) {
}
}
}
}
} catch (Exception s) {
log.error(s);
} finally {
try {
// explicit closing of the iterator is required !!!
it.close();
} catch (CayenneException closeEx) {
log.error(closeEx);
}
}
}
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