setAutoCommit(false)导致读不到数据

如果把Connection的AutoCommit设为False,两次executeQuery之间，通过其它途径（我通过Navicat）修改了status值为1，第二次executeQuery依然把那条数据读出来了，也就是说，我在Navicat中的操作就像没有发生一样，需要重新连接或者con.commit()一下才能读到。猜测可能是事务的隔离级别造成的。

 con.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);

不允许脏读，果然OK了，这种情况平时还是要注意一下的

Connection con = DriverManager
        .getConnection(
                "jdbc:mysql://localhost/spider?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true",
                "root", "111111");
            con.setAutoCommit(false);


        Statement stmt = null;
        ResultSet rs = null;
        try {
            stmt = con.createStatement();

            rs = stmt.executeQuery("select * from queue where status="
                    + String.valueOf(0));
            while (rs.next()) {
                String url = rs.getString("url");
                System.out.println(url);
            }


        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }

        Thread.sleep(15000); //等待的时候在navicat中修改数据的status=1

        System.out.println("next");

        try {
            stmt = con.createStatement();
            rs = stmt.executeQuery("select * from queue where status="
                    + String.valueOf(0));
            while (rs.next()) {
                String url = rs.getString("url");
                System.out.println(url);

            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (stmt != null) {
                try {
                    stmt.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
        }