database-migration

问题 I've got an Ecto migration where I'd like to modify some columns but also migrate some data. For example: import Ecto.Query defmodule MyApp.Repo.Migrations.AddStatus do alter table(:foo) do add(:status, :text) end foos = from(f in MyApp.Foo, where: ...) |> MyApp.Repo.all Enum.each(foos, fn(foo) -> # There's then some complex logic here to work # out how to set the status based on other attributes of `foo` end) end Now, the problem here is that by calling MyApp.Repo.all the migration

问题 I've got an Ecto migration where I'd like to modify some columns but also migrate some data. For example: import Ecto.Query defmodule MyApp.Repo.Migrations.AddStatus do alter table(:foo) do add(:status, :text) end foos = from(f in MyApp.Foo, where: ...) |> MyApp.Repo.all Enum.each(foos, fn(foo) -> # There's then some complex logic here to work # out how to set the status based on other attributes of `foo` end) end Now, the problem here is that by calling MyApp.Repo.all the migration

问题 i am using gulp tasks for migration of database. For testing purpose i am using different database. so i need exactly same database. i am trying to do with sequelize.sync({ force: true }) but its not working. i am having my all models in portal-model. here is the code: const models = require('portal-models'); gulp.task('migrate', ['create-database'], (done) => { models.sequelize.query('SET FOREIGN_KEY_CHECKS = 0') .then(() => models.sequelize.sync({ force: true, alter: true })) .... .... ....

问题 i am using gulp tasks for migration of database. For testing purpose i am using different database. so i need exactly same database. i am trying to do with sequelize.sync({ force: true }) but its not working. i am having my all models in portal-model. here is the code: const models = require('portal-models'); gulp.task('migrate', ['create-database'], (done) => { models.sequelize.query('SET FOREIGN_KEY_CHECKS = 0') .then(() => models.sequelize.sync({ force: true, alter: true })) .... .... ....

问题 Can anyone please explain me the difference between south migrations and django migrations? What advantage/disadvantage one has over another? 回答1: South is a third part django app that added support for migrations before a builtin migration solution was introduced in Django 1.7. Unless you're stuck with a long-dead Django version, there's no reason you should use South at all. FWIW, just checking the south project's page should have answered your question: South has been deprecated. From

问题 How does django know whether a migration has been applied yet? It usually gets it right, but when it doesn't I don't ever know where to start troubleshooting. 回答1: Django writes a record into the table django_migrations consisting of some information like the app the migration belongs to, the name of the migration, and the date it was applied. 回答2: You can simply use showmigrations command to provide a list of migrations $ python manage.py showmigrations whether or not each migration is

问题 I am trying to use flyway repair method to delete unsuccessful migration entries from schema versioning table with spring boot configuration. My code is like this; @Bean public FlywayMigrationStrategy repairStrategy() { return flyway -> { flyway.repair(); flyway.migrate(); }; } But after run, it throws an error like this(repair operation fails even when migration operation is commented out); Error while retrieving the list of applied migrations from Schema History table SQL State : 72000

问题 I'm looking for a node module to make mongo database migrations. So far I found mongo-migrate , but not really powerful enough. (Better than nothing but I need more, I'm used to use the Ruby migration which was really powerful!) I found another one few weeks ago, powerful but doesn't deal with mongoDb, only with MySQL, PostGre and so on. Do you know a module or something that could help me? I mean, I'm not the first person to want to deal with DB migrations, how do you manage that? My project

问题 I am using Laravel 6. I want to run my migration files but during the migration of my "create_users_table" file appears the following error: SQLSTATE[HY000]: General error: 1005 Can't create tab le `thenewmeetingapp`.`#sql-f3c_b8` (errno: 150 "Foreign key constraint is incorrectly formed") (SQL: alter table `users` add constraint `users_permission_id_foreign` foreign key (`permission_id`) references `permissions` (`id`)) I think the error is between the table "users" and the table

问题 Is there any way/laravel-command to drop a specific table from the production server? 回答1: Set up a migration. Run this command to set up a migration: php artisan make:migration drop_my_table Then you can structure your migration like this: <?php use Illuminate\Database\Schema\Blueprint; use Illuminate\Database\Migrations\Migration; class DropMyTable extends Migration { /** * Run the migrations. * * @return void */ public function up() { // drop the table Schema::dropIfExists('my_table'); } /