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What is the easiest way to ignore a JPA field during persistence?
I'm essentially looking for a "@Ignore" type annotation with which I can stop a particular field from being persisted. How can this be achieved?
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Why does Haskell's “do nothing” function, id, consume tons of memory?
Haskell has an identity function which returns the input unchanged. The definition is simple:
1 Answer
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“Insert if not exists” statement in SQLite
I have an SQLite database. I am trying to insert values ( users_id , lessoninfo_id ) in table bookmarks , only if both do not exist before in a row.
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How to use z-index in svg elements?
I'm using the svg circles in my project like this,
13 Answers
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Dynamically adding a form to a Django formset with Ajax
I want to automatically add new forms to a Django formset using Ajax, so that when the user clicks an "add" button it runs JavaScript that adds a new form (which is part of the formset) to the page.
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Android, getting resource ID from string?
I need to pass a resource ID to a method in one of my classes. It needs to use both the id that the reference points to and also it needs the string. How should I best achieve this?
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how to exclude null values in array_agg like in string_agg using postgres?
... use array_agg to collect names, I get my names separated by commas, but in case there is a null value, that null is also taken as a name in the aggregate. For example :
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How to display multiple notifications in android
I am receiving only one notification and if there comes another notification, it replaces the previous one and here is my code
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How to load external webpage inside WebView
My problem is that the webpage is not loaded inside the webview.
13 Answers
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How to Store Historical Data
Some co-workers and I got into a debate on the best way to store historical data. Currently, for some systems, I use a separate table to store historical data, and I keep an original table for the current, active record. So, let's say I have table FOO. Under my system, all active records will go ...