Java PreparedStatement设置间隔

Question

sql语句中interval的正确转义是什么？

当前，我有以下代码可对customerId变量进行转义：

final String query = "delete from login_history where time < current_timestamp - '" + days + " days'::interval and customer_id = ?";
PreparedStatement preparedStatement = connection.prepareStatement(query);
preparedStatement.setInt(1, customerId);
int deleted = preparedStatement.executeUpdate();

但是我也想逃避days。

Answer 1

用"+ days +"替换?，将setInt更改为2而不是1，然后添加

preparedStatement.setWhateverTypeDaysIs(1, days);

Answer 2

最好的解决方案是传递一个int参数乘以一个固定的间隔，例如]

select * from foo where (time + ? * INTERVAL '1' DAY) > current_timestamp

您可以放几天，几个小时...并且比setInt参数