destroy

How to destroy an object?

由 混江龙づ霸主 提交于 2019-11-27 00:45:27
As far as I know (which is very little) , there are two ways, given: $var = new object() Then: // Method 1: Set to null $var = null; // Method 2: Unset unset($var); Other better method? Am I splitting hairs here? Frankie You're looking for unset() . But take into account that you can't explicitly destroy an object. It will stay there, however if you unset the object and your script pushes PHP to the memory limits the objects not needed will be garbage collected. I would go with unset() (as opposed to setting it to null) as it seems to have better performance (not tested but documented on one

when is a spring beans destroy-method called?

由 三世轮回 提交于 2019-11-26 22:53:26
问题 I have put a sysout statement in the "destroy-method" for a bean. When i run a sample code, the sysout is not getting output. Does that mean the destroy-method is not getting called ? The Test Class: package spring.test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class InitTest { public static void main(String[] args) { ApplicationContext ctx = new ClassPathXmlApplicationContext("InitTestContext.xml"

Destroying a Postgres DB on Heroku

由 北城余情 提交于 2019-11-26 18:58:01
问题 I want to destroy the database but I'm not sure what the command would be. Does anyone know how to do this? 回答1: You shouldn't use a postgres command to fully delete your database, as you will not have permissions to create a new one. Instead you should use the heroku command to clear out your database: heroku pg:reset DATABASE_URL 回答2: None of the answers above actually describe how to destroy a Heroku database, which was the original question (and what led me here seeking an answer). From

Remove duplicate records based on multiple columns?

由 大城市里の小女人 提交于 2019-11-26 18:50:34
问题 I'm using Heroku to host my Ruby on Rails application and for one reason or another, I may have some duplicate rows. Is there a way to delete duplicate records based on 2 or more criteria but keep just 1 record of that duplicate collection? In my use case, I have a Make and Model relationship for cars in my database. Make Model --- --- Name Name Year Trim MakeId I'd like to delete all Model records that have the same Name, Year and Trim but keep 1 of those records (meaning, I need the record

How to destroy an object?

由 淺唱寂寞╮ 提交于 2019-11-26 12:25:25
问题 As far as I know (which is very little) , there are two ways, given: $var = new object() Then: // Method 1: Set to null $var = null; // Method 2: Unset unset($var); Other better method? Am I splitting hairs here? 回答1: You're looking for unset(). But take into account that you can't explicitly destroy an object. It will stay there, however if you unset the object and your script pushes PHP to the memory limits the objects not needed will be garbage collected. I would go with unset() (as

Difference between Destroy and Delete

由 冷暖自知 提交于 2019-11-26 09:06:20
问题 What is the difference between @model.destroy and @model.delete For example: Model.find_by(col: \"foo\").destroy_all //and Model.find_by(col: \"foo\").delete_all Does it really matter if I use the one or the other? 回答1: Basically destroy runs any callbacks on the model while delete doesn't. From the Rails API: ActiveRecord::Persistence.delete Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can't be persisted). Returns the
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