获取插入数据的自增ID值

在不使用其他框架的情况下，使用JdbcTemplate对象的 update(PreparedStatementCreator psc，KeyHolder generatedKeyHolder) 方法实现获取数据库刚插入数据的自增ID值。

Dao层代码如下：

public Long save(final User user) { 
        PreparedStatementCreator creator = new PreparedStatementCreator() { 
            public PreparedStatement createPreparedStatement(Connection connection) throws SQLException { 
                PreparedStatement preparedStatement = connection.prepareStatement("insert into user values(?,?,?,?,?)", PreparedStatement.RETURN_GENERATED_KEYS);
                preparedStatement.setObject(1,null);
                preparedStatement.setString(2,user.getUsername());
                preparedStatement.setString(3,user.getEmail());
                preparedStatement.setString(4,user.getPassword());
                preparedStatement.setString(5,user.getPhoneNum());
                return preparedStatement;
            }
        };
        GeneratedKeyHolder keyHolder = new GeneratedKeyHolder();
        
        //keyHolder接收返回的自增id
        jdbcTemplate.update(creator,keyHolder);
        long userId = keyHolder.getKey().longValue();
        return userId;
    }

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