Symfony 5：基表或视图已存在：1050 表“migration_versions”已存在

Question

I have a Symfony 5 app, which includes three doctrine migrations. I try to run the following commands:

bin/console doctrine:database:drop --force
bin/console doctrine:database:create
bin/console doctrine:migrations:migrate

... but when running the third command, I get these errors:

In AbstractMySQLDriver.php line 38:

An exception occurred while executing 'CREATE TABLE migration_versions (version VARCHAR(14) NOT NULL, executed_a
  t DATETIME NOT NULL COMMENT '(DC2Type:datetime_immutable)', PRIMARY KEY(version)) DEFAULT CHARACTER SET utf8mb4
  COLLATE `utf8mb4_unicode_ci` ENGINE = InnoDB':

  SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'migration_versions' already exists


In PDOConnection.php line 43:

  SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'migration_versions' already exists


In PDOConnection.php line 41:

  SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'migration_versions' already exists

I have tried adding the following code in doctrine.yaml :

doctrine:
    dbal:
        url: '%env(resolve:DATABASE_URL)%'
        schema_filter: ~^(migration_versions)$~

... per this answer on a different question , but this does not solve the problem. What am I doing wrong here?

====

EDIT 1: Here is the content of doctrine_migrations.yaml:

doctrine_migrations:
    dir_name: '%kernel.project_dir%/src/Migrations'
    # namespace is arbitrary but should be different from App\Migrations
    # as migrations classes should NOT be autoloaded
    namespace: DoctrineMigrations

EDIT 2: I double-checked to make sure that none of my three migrations contains a creation of the migration_versions table. It's not being created in any of those three migrations. So it's very mysterious where the error is coming from.

EDIT 3: I ran these three commands:

bin/console doctrine:migrations:execute --up --version 20191210174025
bin/console doctrine:migrations:execute --up --version 20201219113811
bin/console doctrine:migrations:execute --up --version 20201221174858

... and got back Symfony 5.0.1 (env: dev, debug: true) each time, with no error appearing. So I don't think the problem is in the migrations themselves.

Answer 1

Every time when you run the migration command, doctrine migrator check if the migration table exists. The migrator checks by doctrine schema manager . It seems that in your situation the isInitialized method always returns false .

You can debug the isInitialized method. Especially rows $this->schemaManager->tablesExist([$this->configuration->getTableName()])

Doctrine checks if a table exists by getting a list of tables from information_schema (for MySQL). The SQL will be something like that:

SELECT table_name
FROM information_schema.tables
WHERE table_schema = 'databasename'

It seems in your case there is desynchronization between information_schema.tables and tables in your database.

The faster fix: change your database name

Answer 2

ry to run the following commands:

bin/console doctrine:schema:update

doctrine:schema:update --force to execute the command doctrine:schema:update --dump-sql to dump the SQL statements to the screen

to see:: https://symfony.com/doc/current/DoctrineMigrationsBundle/index.html