更新插入HSQLDB

Question

我想重写代码，这是使用MySQL数据库，以使用HSQLDB。我有一个INSERT INTO ... ON DUPLICATE KEY UPDATE查询。 HSQLDB有这种方法的替代方法吗？

代码：

PreparedStatement ps = conn.prepareStatement("INSERT INTO user_stats " 
    + "(user, balance, kills, level)" 
    + " VALUES(?, ?, ?, ?) ON DUPLICATE KEY " 
    + "UPDATE balance=VALUES(balance), kills=VALUES(kills), level=VALUES(level)"); 

ps.setString(1, playername); 
ps.setDouble(2, PluginInterract.getESSBalance(playername)); 
ps.setInt(3, PluginInterract.getKills(playername)); 
ps.setDouble(4, PluginInterract.getPluginLevel(playername)); 

Answer 1

未按the documentation。然而，MERGE声明可能会做你想要的。下面是基于文档为MERGE未测试例如：

MERGE INTO user_stats USING (VALUES(?, ?, ?, ?)) 
    AS vals(user, balance, kills, level) ON user_stats.user = vals.user 
    WHEN MATCHED THEN UPDATE SET user_stats.balance = vals.balance, user_stats.kills = vals.kills, user_stats.level = vals.level 
    WHEN NOT MATCHED THEN INSERT VALUES vals.user, vals.balance, vals.kills, vals.level 

Answer 2

从2.3.3版本（2015年6月）HSQLDB支持MYS兼容模式INSERT INTO ... ON DUPLICATE KEY UPDATE ...。

参见：http://hsqldb.org/doc/guide/guide.html#coc_compatibility_mysql

但2.3.3版本不支持MySQL的Values(COLUMN_NAME)方法。