/** Fully roll back the current transaction. */
public void rollback() {
checkCommitRollback();
currentTransactionName = null;
boolean needCommit = false;
if (undoLog.size() > 0) {
rollbackTo(null, false);
needCommit = true;
}
if (transaction != null) {
rollbackTo(null, false);
needCommit = true;
// rollback stored the undo operations in the transaction
// committing will end the transaction
transaction.commit();
transaction = null;
}
if (locks.size() > 0 || needCommit) {
database.commit(this);
}
cleanTempTables(false);
if (autoCommitAtTransactionEnd) {
autoCommit = true;
autoCommitAtTransactionEnd = false;
}
endTransaction();
}
/**
* Commit the current transaction. If the statement was not a data definition statement, and if
* there are temporary tables that should be dropped or truncated at commit, this is done as well.
*
* @param ddl if the statement was a data definition statement
*/
public void commit(boolean ddl) {
checkCommitRollback();
currentTransactionName = null;
transactionStart = 0;
if (transaction != null) {
// increment the data mod count, so that other sessions
// see the changes
// TODO should not rely on locking
if (locks.size() > 0) {
for (int i = 0, size = locks.size(); i < size; i++) {
Table t = locks.get(i);
if (t instanceof MVTable) {
((MVTable) t).commit();
}
}
}
transaction.commit();
transaction = null;
}
if (containsUncommitted()) {
// need to commit even if rollback is not possible
// (create/drop table and so on)
database.commit(this);
}
removeTemporaryLobs(true);
if (undoLog.size() > 0) {
// commit the rows when using MVCC
if (database.isMultiVersion()) {
ArrayList<Row> rows = New.arrayList();
synchronized (database) {
while (undoLog.size() > 0) {
UndoLogRecord entry = undoLog.getLast();
entry.commit();
rows.add(entry.getRow());
undoLog.removeLast(false);
}
for (int i = 0, size = rows.size(); i < size; i++) {
Row r = rows.get(i);
r.commit();
}
}
}
undoLog.clear();
}
if (!ddl) {
// do not clean the temp tables if the last command was a
// create/drop
cleanTempTables(false);
if (autoCommitAtTransactionEnd) {
autoCommit = true;
autoCommitAtTransactionEnd = false;
}
}
endTransaction();
}
@Override
public void close() {
if (!closed) {
try {
database.checkPowerOff();
removeTemporaryLobs(false);
cleanTempTables(true);
undoLog.clear();
database.removeSession(this);
} finally {
closed = true;
}
}
}
