/* This file is part of VoltDB.
 * Copyright (C) 2008-2012 VoltDB Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

package voter.procedures;

import org.voltdb.ProcInfo;
import org.voltdb.SQLStmt;
import org.voltdb.VoltProcedure;
import org.voltdb.VoltTable;
import org.voltdb.VoltType;
import org.voltdb.VoltTable.ColumnInfo;

@ProcInfo (
    partitionInfo = "transactions.pid:0",
    singlePartition = true
)
public class doTxn extends VoltProcedure {

    public final SQLStmt getLastTxnId = new SQLStmt(
            "SELECT txnid FROM transactions WHERE txnid < ? ORDER BY txnid LIMIT 1;");

    public final SQLStmt insertTxnid = new SQLStmt(
            "INSERT INTO transactions VALUES (?, ?);");

    public VoltTable run(byte partition) {
        voltQueueSQL(getLastTxnId, getTransactionId());
        voltQueueSQL(insertTxnid, getTransactionId(), partition);
        return voltExecuteSQL()[0];
    }
}

@@ -1594,16 +1594,21 @@
 Y txnid 
+DESC 
 LIMIT 1;

Order by should be descending to be self checking