dirty-data

How can I add an “IsDirty” property to a LINQ to SQL entity?

由 爱⌒轻易说出口 提交于 2019-12-19 10:05:19
问题 I am binding my entities to an edit form in WPF. Within a DataTemplate, I want to be able to set the background color of the root container within a DataTemplate to show it has been changed and these changes have not yet been submitted to the database. Here's a very simple sample that demonstrates what I'm talking about (forgive errors): <Page ...> <Page.DataContext> <vm:MyPageViewModel /> <!-- Holds reference to the DataContext --> </Page.DataContext> <ItemsControl ItemsSource = {Binding

Rails partial updates problem with hashes

由 大兔子大兔子 提交于 2019-12-11 06:25:21
问题 Rails ActiveRecord support partial updates and it works well most of the time, but in case we have serialized hash field AR executes update every time, even if nothing has been changed. Here example from rails console: ### Create class and table ### >> class Xx < ActiveRecord::Base; serialize :params; end => Object >> ActiveRecord::Base.connection.execute "CREATE TABLE xxes(id serial, params text)" SQL (43.8ms) CREATE TABLE xxes(id serial, params text) => #<PGresult:0x112113380> ### Create

Rails is not saving an attribute that is changed [duplicate]

由 若如初见. 提交于 2019-12-11 02:40:01
问题 This question already has answers here : New data not persisting to Rails array column on Postgres (3 answers) Closed 4 years ago . I am appending some text to a notes field on one of my ActiveRecord::Base models but when I save it, it doesn't get updated: valve.notes #=> "Level: Top" valve.notes << "\nDirection: North" valve.notes #=> "Level: Top\nDirection: North" valve.save #=> true valve.reload.notes #=> "Level: Top" 回答1: Concat doesn't tell ActiveRecord that an Attribute has changed.

How can I add an “IsDirty” property to a LINQ to SQL entity?

由 徘徊边缘 提交于 2019-12-01 11:02:29
I am binding my entities to an edit form in WPF. Within a DataTemplate, I want to be able to set the background color of the root container within a DataTemplate to show it has been changed and these changes have not yet been submitted to the database. Here's a very simple sample that demonstrates what I'm talking about (forgive errors): <Page ...> <Page.DataContext> <vm:MyPageViewModel /> <!-- Holds reference to the DataContext --> </Page.DataContext> <ItemsControl ItemsSource = {Binding Items}> <ItemsControl.Resources> <DataTemplate DataType="Lol.Models.Item"> <!-- Item is L2S entity --> <!-

What is meant by the term “dirty object”?

由 老子叫甜甜 提交于 2019-11-30 06:06:04
I see the term "dirty" or "dirty objects" a lot in programming. What does this mean? A dirty object is an object that has changed in its content, but this content has not been synchronized back into the database/disk. It's a typical situation of desynchronization between a cache and a storage. EDIT: original question was phrased as I find a lot in "programming dirty" , this answer attempts to address that. The accepted answer is about dirty objects , which signifies changed status or content. "Programming dirty" as you quote it, also means that you use a "quick and dirty" method for solving a

What is meant by the term “dirty object”?

由 心不动则不痛 提交于 2019-11-29 04:43:37
问题 I see the term "dirty" or "dirty objects" a lot in programming. What does this mean? 回答1: A dirty object is an object that has changed in its content, but this content has not been synchronized back into the database/disk. It's a typical situation of desynchronization between a cache and a storage. 回答2: EDIT: original question was phrased as I find a lot in "programming dirty" , this answer attempts to address that. The accepted answer is about dirty objects , which signifies changed status

ObjectContext.Refresh()?

由 ぐ巨炮叔叔 提交于 2019-11-27 04:16:23
How to update ALL the dirty entities from the data store, and reset their changed values to the original store value? The method ObjectContext.Refresh requires as a parameter the entities to be refreshed. The following usually works: Context.Refresh(RefreshMode.StoreWins, _ Context.ObjectStateManager.GetObjectStateEntries()) It sometimes causes problems with EntityRelations. look at my comment for further details. You can use this code: public void RefreshAll() { // Get all objects in statemanager with entityKey // (context.Refresh will throw an exception otherwise) var refreshableObjects =

ObjectContext.Refresh()?

由 人走茶凉 提交于 2019-11-26 11:07:29
问题 How to update ALL the dirty entities from the data store, and reset their changed values to the original store value? The method ObjectContext.Refresh requires as a parameter the entities to be refreshed. 回答1: The following usually works: Context.Refresh(RefreshMode.StoreWins, _ Context.ObjectStateManager.GetObjectStateEntries()) It sometimes causes problems with EntityRelations. look at my comment for further details. 回答2: You can use this code: public void RefreshAll() { // Get all objects
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