问题
I've just deployed my app to DigitalOcean using (Managed Database) and I'm getting the following error when calling php artisan migrate
SQLSTATE[HY000]: General error: 3750 Unable to create or change a table without a primary key, when the system variable 'sql_require_primary_key' is set. Add a primary key to the table or unset this variable to avoid this message. Note that tables without a primary key can cause performance problems in row-based replication, so please consult your DBA before changing this setting. (SQL: create table `sessions` (`id` varchar(255) not null, `user_id` bigint unsigned null, `ip_address` varchar(45) null, `user_agent` text null, `payload` text not null, `last_activity` int not null) default character set utf8mb4 collate 'utf8mb4_unicode_ci')
It appears that Laravel Migrations doesn't work when mysql var sql_require_primary_key is set to true.
Do you have any solutions for that?
回答1:
According to the MySQL documentation purpose of this system variable is
to avoid replication performance issues: "Enabling this variable helps avoid performance problems in row-based replication that can occur when tables have no primary key."
IMHO, there are two possible options to consider for your problem;
- Add primary key to this and every table in your migration, including temporary tables. This one is better and i think more convenient way to do it since there is no drawback to have primary key for each table.
Whether statements that create new tables or alter the structure of existing tables enforce the requirement that tables have a primary key.
- Change your provider because according to here "We support only MySQL v8."
Also here is the bug report
回答2:
Just add set sql_require_primary_key = off
Like this
to your SQL file.
回答3:
Unfortunately, we can't change the sql_require_primary_key value in the digital ocean MySQL database. instead, you can set the id to the primary key just by adding primary()
回答4:
When enabled, sql_require_primary_key has these effects:
- Attempts to create a new table with no primary key fail with an error. This includes CREATE TABLE ... LIKE. It also includes CREATE TABLE ... SELECT, unless the CREATE TABLE part includes a primary key definition.
- Attempts to drop the primary key from an existing table fail with an error, with the exception that dropping the primary key and adding a primary key in the same ALTER TABLE statement is permitted.
Dropping the primary key fails even if the table also contains a UNIQUE NOT NULL index.
- Attempts to import a table with no primary key fail with an error.
Default value is OFF , but in your case you need to set OFF from ON
IMPORTANT LINK
HOW TO SET
回答5:
add this line to your migration file. $table->increments('aid');
来源：https://stackoverflow.com/questions/62418099/unable-to-create-or-change-a-table-without-a-primary-key-laravel-digitalocean