I have a problem while working with SQLite database connection model in laravel 4.
After create schemas and run migrate:install, migrate, (db:seed) everything works perfectly. But if I delete the sqlite file for some reason, I am not able to recreate the file. migrate:install and migrate also run without any warnings but the app does not create the file. What am I doing wrong?
Laravel is not responsible for creating database files, they should exist when it tries to connect to them, but... PDO_SQLITE should create the database if it doesn't exists. Then, if it is not creating, you should check your folder permissions and webserver log files.
Related
I am trying to replace sql server with sqlite as database in aspnetboilerplate following this tutorial. we have to remove previous migrations and add new one before running "update-database" but it gives empty database and running this project gives error " 'SQLite Error 1: 'no such table: AbpEditions". how to populate newly installed sqlite database?
there are SeedHelper.cs and initialHostDbBuilder.cs files in EntityFrameworkCore project, probably for seeding database but i could not figure out how to use them?
Make sure that config files in all of your projects that need the access to the database are pointing to the same file. If you have just used the value from the article
"Default": "Data Source=SqliteDemoDb.db"
then you have a separate database file in each project. The file that the migrations are executed on is in the EntityFramework project.
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.
I am having a very bad situation here, working on a Laravel 5 project. previously developed by another developer. That developer at start created couple of tables using migration generators and added some columns using migrations. After that, he added table columns straight away using some sql GUI. I was given the sql dump which i imported and set it up on my local machine, now when i created a table using php artisan make:migration create_myTableName_table --create="myTableName" the table migration is created successfully, but, when i did php artisan migrate it's giving me SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'someTable' already exists I checked migrations folder and matched it with current version of someTable and i can see the columns are different, same with other tables aswell.
What should be the best case to handle this in this situation, i want to keep up with Laravel migrations generator so that in future if any other developer want to work on this project he just has to run migration command to migrate database or to create tables or create columns... Should i re-write all migrations ? pleas help. Thanks
Given your situation, I’d put the .sql export in your repository, clear out the old, broken migrations, and create a new one that initially imports the database dump. Then just create migrations as normal going forward.
Quick and dirty?
Delete current migration files. Clear your migrations table and export the whole DB. Put the SQL dump in the repo and instruct other devs to import it before they run php artisan migrate. With the dump imported and migrations table truncated, you can create new migrations with no further collisions with the legacy migrations.
Feeling ambitious?
Use a package like migrations-generator to generate migrations based on your current DB structure. Then, migrate away.
Before I execute a migration on localhost I want to be sure that I can still execute the same migration on my server.
Will i still be able to execute the same migration remotely or will laravel mark that migration as done somewhere?
The migration information is stored inside the database that was migrated (in a "migrations" table). As long as your localhost and your server are not looking at the same database, you'll be fine.
I have a local instance of a database that I recently created using DbContext.Database.Create(), so the __MigrationHistory table exists with an InitalCreate entry that matches the code at the moment.
Some code-based migrations exist in the Migrations folder, however. These will be run in our development and staging environments to bring those databases in line with the code. I don't need to apply them locally, however, since I created the database using the current code.
I now need to make a change to the model and create the corresponding migration. But when I run Add-Migration TestMigration, I get the following error
Unable to generate an explicit migration because the following explicit
migrations are pending:
[201203271113060_AddTableX,
201203290856574_AlterColumnY]
Apply the pending explicit migrations before attempting to generate
a new explicit migration.
What should I do in this case? I can't point the Add-Migration tool at another environment because it's not guaranteed that version matches what I have locally. I want a migration that matches only the changes I've made.
It seems I have a few options but none are ideal:
Delete the other migrations from the Migrations folder, run the Add-Migration command, upgrade the database, then restore the old migrations. This is simple but seems a bit hackish.
Revert to the version of the model in source control that the first migration was applied to, then build this and use it to create the database. Then get the latest version, apply all the migrations, then I'm ready to add my migration. This seems like a lot of effort!
Create the migration manually.
Does anyone have any suggestions about how to manage this?
We are planning to use a variant of your Option #1...
Our Standard Operating Procedure is to generate a SQL script for each migration (using the -script option of update-database), in order to have SQL scripts to be applied to end-user "production" databases by InstallShield (we plan to use EF update-database only for developer databases).
Thus, we have both the Migration .cs files and the corresponding .sql files for all migrations in our Migrations folder.
So rather than deleting the migrations from the Migrations folder (as you proposed in #1), we use SQL Mgmt Studio to manually apply just the parts of the .sql files that do the inserts into _MigrationHistory.
That brings the _MigrationHistory of the local database up-to-date with the changes that are already incorporated into that database.
But it's a kludge, and we're still looking for a better solution.
DadCat
What I've found works best is very simple: don't use DbContext.Database.Create() once you've enabled migrations. If you want to programmatically create a new database, use the migrations API instead.
var migrator = new DbMigrator(new Configuration());
migrator.Update();
Then you've got the full migration history and adding further migrations works just as expected.
You either need to run "update-database" from the package manager console to push your changes to the database OR you can delete the pending migration file ([201203271113060_AddTableX]) from your Migrations folder and then re-run "add-migration" to create a brand new migration based off of your edits.
I have encountered the same problem.
If you run
Update-database
and then run
Add-Migration YourMigrationName
This solves the problem
simply exclude the old migration file from the solution files.