How to rollback the single table in laravel 4.
I ran php artisan migrate:rollback to roll back all the migrations but how to rollback the single table
Advice much appreciated
for example, you want to create the user table again, just go to mysql and delete from migration's table the field that correspond to TIMESTAMP_create_users_table:
DELETE FROM MIGRATIONS WHERE MIGRATION ="2014_10_12_000000_create_users_table";
and drop the users table too:
DROP TABLE users;
after that, just run
php artisan migrate
and that's it!
If you wish to rollback only a specific table, you should make a migration that only includes that table. It's really that simple. Making large migrations covering several updates doesn't make any sense.
Create migrations based upon their purpose. That means; on a live project every little code change should have its own related migration.
Just run The command (Laravel 5):-
php artisan migrate:rollback --step=5
It will undo last 5 migrations (in fact it will execute the function "down" in each one)
php artisan migrate
It will add all migration table into database
Related
I have a site in development so database structure is still in flux. If I run migrate:reset, this rollbacks all migrations. Am I, therefore, okay to amend the migrations - i.e. amend Schema closures and remove migration files etc - as opposed to adding more migrations to amend the DB structure? For example, client asked for certain functionality requiring a table, decides later he doesn't want it so I have a table in my migrations I will never use. Ideally I don't want this to appear in my migrations.
If you don't need a table anymore in your project of course you can delete it's migration file.
When you run php artisan migrate:reset Laravel rolls back all migrations. But if you delete your migration file without rolling it back, Laravel will try to find that migration file to roll it back and when it can't find that file; it will throw an exception.
In such cases you can use php artisan migrate:fresh
With migrate:fresh Laravel doesn't try to find and roll back migrations, it just drops all tables and starts a fresh migrations table and migrates every file from start.
So; if you have changes on your migration files, anything, and if you are on development enviroment and nothing will affected: you can do whatever you want with your migration files and run php artisan migrate:fresh to drop every table and migrate them again.
Please check here: https://laravel.com/docs/8.x/migrations#rolling-back-migrations
I created a MYSQL database using migrations, I added some data into it, but after that I recognized that I need to add a new column into my table.
I ran the command: 'php artisan migrate', but as it didn't work to synchronize
columns, it returns there is nothing to migrate.
So I ran the command 'php artisan migrate:reset', and then ran the command
'php artisan migrate' again, database schema updated correctly but for sure I
lost all my inserted data.
Now I'm just testing the application, but it would be very harmful if I found out that I should modify my database while it is runing with real data!!! What should I do in this case?
should I skip using migrations and create the Mysql database directly with
wamp? or use migration, but perform any later updates directly on database without updating the migration files? or there is another solution?
Answer
If you have already created a database table and realise you need to add more into it you can simply run: php artisan make:migration add_field_to_table_name --table=tableName
You then go into that file and create the new field. Once done simply run php artisan migrate and it'll add the new field into the desired table without causing any data loss.
Seeders
On another note, I would strongly suggest looking into seeders. This way when you're creating a project you can always refresh your migrations (wipe your database and re-migrate your tables) and then re-input the data using seeders.
you can create a migration to alter your tables. add new columns and more.
Laravel 5.5.
I need to add an additional table to DB without loss of data in existing tables. Re-seeding after the "php artisan migrate: rollback" is not suitable, since there is too much data and seeding will last for several days.
Is it possible to add new table without any affect on the existing tables?
you can rollback several steps using
php artisan migrate:rollback --step=2
this will rollback last two migrated table
As per laravel doc, To rollback the latest migration operation, you may use the rollback command. This command rolls back the last "batch" of migrations, which may include multiple migration files:
php artisan migrate:rollback
You may rollback a limited number of migrations by providing the step option to the rollback command. For example, the following command will rollback the last five migrations:
php artisan migrate:rollback --step=5
The migrate:reset command will roll back all of your application's migrations:
php artisan migrate:reset
You can check here. But i need to remove the specific migration file. As per my project having 30-40 migration file. I want to remove one of the migration file and its model. Is there any way to do this or have to do it manually.
Don’t. Migrations are version control for your database. “Removing” a particular migration is like removing a random commit from your Git repository’s history: it can have terrible consequences.
Instead, if you no longer need a table, then create a new migration that drops that table in the up method, and recreates it in the down method so the migration can be rolled back.
Delete the migration file, remove the table from the database, and also remove that file name from migrations table in the database.
Sometimes, doing things manually is the best way.
Just do it manually and save yourself the stress of further issues
Delete the model first (if you don't) need the model any longer
Delete the migration from ...database/migrations folder
If you have already migrated i.e if you have already run php artisan migrate, log into your phpmyadmin or SQL(whichever the case is) and in your database, delete the table created by the migration
Still within your database, in the migrations folder, locate the row with that migration file name and delete the row.
Works for me, hope it helps!
If you simply remove (delete) the migration file and re-run the migrations (migrate:refresh), the database tables will be rebuilt (without the table that's defined in the migration file you deleted).
you can increment the batch number of that particular migration to make it latest batch and run rollback command.
Rollback one specific migration in Laravel
I need to rollback a specific table as I forgot to mention foreign key.
and I dont want my data loss from all tables.
My framework is Laravel 5.4
Thanks in Advance Everyone
I do it this way:
Deleting a table manually;
Going to "migrations" table and deleting corresponding row to your migration;
php artisan migrate;
done
For example, if you modified migration called "Settings", then you delete this table from DB and migrations table, then rerun artisan command.
You can do
php artisan migrate:rollback --path=/database/migrations/your_file.php
Migrations are meant to be applied and rolled back in a specific order. Therefore there is no "proper" way of reapplying an arbitrary migration.
In any case there are at least two options:
"Fail forward" - create a subsequent migration that creates a necessary FK and apply it. This is the only proper way if you are already in production.
If you're just in early stages of development and don't won't to bloat the migrations directory you can
dump the tables so that you preserve the data
rollback up to this particular migration
fix and test the migration
migrate
load the data from dumps
Unfortunately there isn't an option to rollback a migration per table basis. You can only rollback the latest migration or last few migrations using the step parameter.
But there is a hacky way to do it in case you really need to. You can set the batch value in the migrations table to a higher number than the most recent migration for only the migrations you want to rollback. With this when you call php artisan migrate:rollback, only that particular migration files with batch value altered would rollback.