MySQL Driver

[mattes]

No description provided.

[mattes]

https://github.com/go-sql-driver/mysql/

[mattes]

see https://github.com/mattes/migrate/tree/mysql

[mattes]

I added experimental support for mysql migrations. The issue is that there is no golang mysql driver that supports multiple sql statements per query. So the mysql driver splits sql statements by semicolons ;.

Goose uses some custom split strings to format sql migrations. I really would like to avoid that. Is there a golang mysql driver that supports multiple sql statements?

[daddykotex]

Hi

I like what you did, great job! Keep up the good work.

I came here to ask you a little question, I'm using migrate in my project with MySQL. I know it's still under development, no worries there. It came to my attention that when my program runs and that there is an up migration to do (I added a table for example), migrate does it just fine, no problem with that, but I can't halt my app with ^C anymore.

If migrate runs something against my database, then I can't stop my program anymore. I don't know if it is related to the MySQL driver, but maybe you can point me in a direction while I'm looking into it, it could go faster! It might be on my side too.

Thanks, a lot, and by the way, I looked into the driver and tried a pull request to handle multiple statement but it was closed. You can see my pull request here : go-sql-driver/mysql#296

[mattes]

Thanks!

but I can't halt my app with ^C anymore.

When a migration is running and you hit ^C migrate will wait until the current migration has been applied. But it's a good point. Sometimes you really want to force an exit regardless of running migrations. I guess hitting ^C twice should exit immediately. This isn't implemented though.

I looked into the driver and tried a pull request to handle multiple statement but it was closed.

It's too bad database/sql does not support multiple statements. I think @arnehormann put it in a nutshell:

The good news: MySQL can do this on its own. We only have to set two flags when a connection is established. The bad news: database/sql does not support it in any way. As it's unsupported by database/sql, we won't support it either

[mattes]

see also #39

[raphaeljlps]

hey @mattes what do you think about mymysql?
I am thinking about implementing the Driver interface for it, do you think is worth ?

[arnehormann]

For cases like yours, you can also use the driver by its database/sql/driver interface (mysql.MySQLDriver{}.Open(dsn)).
That way, you get a single-connection session instead of a connection pool - with a little more setup boilerplate.
I think there's some ORM tools already doing so.

[mattes]

I never used it, but https://github.com/ziutek/mymysql#example-4---multi-statement--multi-result looks promising. If you want to give it a try, go for it. Will definitely merge if it works.

[raphaeljlps]

okay, @mattes I will start to work on it soon.

[alecha]

I'd like to use migrate as a library in my go package, but I've seen that in the init function you call

driver.RegisterDriver("mysql", &Driver{})

and this cause a panic because in the same package I also have to import the mysql package that does the same.

There is a way to prevent that?

Thanks!

[mattes]

I'm surprised, because the mysql driver registers with https://github.com/mattes/migrate/blob/master/driver/registry.go which is unrelated from the any other mysql driver.

[alecha]

Actually the "mysql" name is used both by your driver and by go-sql-driver package, am I missing something?

https://github.com/go-sql-driver/mysql/blob/master/driver.go

[daddykotex]

You can rename the package when you import:

import (  
    MysqlDriver  "mysql" //rename
)

[alecha]

This won't solve the problem, because in these two files I'm importing they are creating a driver with the same name, as it will panic

https://github.com/go-sql-driver/mysql/blob/master/driver.go : line 148
https://github.com/mattes/migrate/blob/master/driver/mysql/mysql.go : line 184

[daddykotex]

Ok, I misunderstood your problem.

[mattes]

Can you send the panic log?

[alecha]

panic: sql: Register called twice for driver mysql
goroutine 1 [running]:
database/sql.Register(0x71ff90, 0x5, 0xc6c920, 0xafb488)
/usr/local/go/src/database/sql/sql.go:41 +0x181
github.com/go-sql-driver/mysql.init.1()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/go-sql-driver/mysql/driver.go:148 +0x71
github.com/go-sql-driver/mysql.init()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/go-sql-driver/mysql/utils.go:973 +0x61c
github.com/mattes/migrate/driver/mysql.init()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/mattes/migrate/driver/mysql/mysql.go:185 +0x5e
github.com/empatica/web_embrace_api/database.init()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/empatica/web_embrace_api/database/userWatchdog.go:65 +0x6c
github.com/empatica/web_embrace_api/controllers.init()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/empatica/web_embrace_api/controllers/zipperController.go:53 +0x79 main.init()
/Users/alessiocavaleri/Documents/Code/go/src/github.com/empatica/web_embrace_api/embrace_api/main.go:75 +0x62

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1696 +0x1

[alecha]

any news?

[jonaz]

What about this?
https://github.com/go-sql-driver/mysql#multistatements

[revett]

+1

[dselans]

Running into the same issue as @alecha.