upgrade

问题 I have created a SQLite database successfully and it works fine. However when the onUpgrade method is called, I'd like to do so without losing data. The app I'm developing is a quiz app. Simply, when the onCreate method is called I create and prepopulate a database with questions, answers etc. The last column is whether they have set the question as a favourite or not. What I would like to do is that when the onUpgrade method is called, I'd like to temporarily save that one column, drop the

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Painless way to install a new version of R? In R, packages are not compatible across upgrades, and must be reinstalled. Is there any way to easily install the same set of packages in the new version as what I had installed in the old version? Edit: I can't easily access the old version of R, since I upgrade via apt. 回答1: I just posted a question with a possible solution: update.packages(checkBuilt=TRUE, ask

问题 After upgrading MySQL to 5.7.8-rc and loging to server I got error: Table 'performance_schema.session_variables' doesn't exist I can't find any solution for this. Can you help ? 回答1: The mysql_upgrade worked for me as well: # mysql_upgrade -u root -p --force # systemctl restart mysqld Regards, MSz. 回答2: I was able to log on to the mysql server after running the command @robregonm suggested: mysql_upgrade -u root -p --force A MySQL server restart is required. 回答3: mysql -u app -p mysql> set @

问题 After upgrading MySQL to 5.7.8-rc and loging to server I got error: Table 'performance_schema.session_variables' doesn't exist I can't find any solution for this. Can you help ? 回答1: The mysql_upgrade worked for me as well: # mysql_upgrade -u root -p --force # systemctl restart mysqld Regards, MSz. 回答2: I was able to log on to the mysql server after running the command @robregonm suggested: mysql_upgrade -u root -p --force A MySQL server restart is required. 回答3: mysql -u app -p mysql> set @

问题 I'm about to upgrade a SVN server from version 1.5.5 to 1.6.5 - all is fine with the actual upgrade, but I'm a little confused about upgrading the actual repositories. I've read in a few places (here, here), that it's better to dump and reload the repositories rather than using svnadmin upgrade . I assume that I should dump, upgrade the server and then load the dumps back in - however, should I clear the old files out of the repository before loading? If so, what's the best way to do this? If

问题 This question already has answers here : Check if my IOS application is updated (7 answers) Closed 2 years ago . I am developing an application and i need to know whether user installed the app for the first time or upgraded it from the App Store. How can i detect whether app is installed for the first time or upgraded or re-installed? Thanks for your answers in advance. 回答1: You can differentiate between the first start after installing the App, the first start after an update and other

问题 Currently, I have upgraded version of Django from 2.0.6 to 3.0 and suddenly after calling python manage.py shell command got this error: ImportError: cannot import name 'six' from 'django.utils' (/path-to-project/project/venv/lib/python3.7/site-packages/django/utils/ init .py) Full trace: Traceback (most recent call last): File "manage.py", line 13, in <module> execute_from_command_line(sys.argv) File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__

问题 Currently, I have upgraded version of Django from 2.0.6 to 3.0 and suddenly after calling python manage.py shell command got this error: ImportError: cannot import name 'six' from 'django.utils' (/path-to-project/project/venv/lib/python3.7/site-packages/django/utils/ init .py) Full trace: Traceback (most recent call last): File "manage.py", line 13, in <module> execute_from_command_line(sys.argv) File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__

问题 My App created by Meteor is now doing upgrading by Meteor's HCP(Hot Code Push), which means the user will get a new version as soon as he restarts the App, without any information or confirm dialog. HCP is great, but there are two reasons some users don't want the App be upgraded quietly: New version may have degrades or other risks. Old version is enough for theirs uses. So I want to know if there is a way, I can show user a new-version-available dialog describing features of the new version

问题 Just was checking this episode by Ryan Bates and it seems that Rails 3.2.x has different setup. Seems that check_box_tag requires different attributes other than Ryan puts in there. AS it writes back unexpected kEND... to <%= check_box_tag "task_ids[]", task.id %> Any help appreciated 回答1: Your error is unrelated to your use of check_box_tag . " unexpected kEND " indicates an unexpected end-of-file, meaning you've opened a block or other nested structure somewhere and failed to close it.