Single transaction based sql.Driver for GO
Package txdb is a single transaction based database sql driver. When the connection
is opened, it starts a transaction and all operations performed on this sql.DB
will be within that transaction. If concurrent actions are performed, the lock is
acquired and connection is always released the statements and rows are not holding the
connection.
Why is it useful. A very basic use case would be if you want to make functional tests
you can prepare a test database and within each test you do not have to reload a database.
All tests are isolated within transaction and though, performs fast. And you do not have
to interface your sql.DB reference in your code, txdb is like a standard sql.Driver.
This driver supports any sql.Driver connection to be opened. You can register txdb
for different sql drivers and have it under different driver names. Under the hood
whenever a txdb driver is opened, it attempts to open a real connection and starts
transaction. When close is called, it rollbacks transaction leaving your prepared
test database in the same state as before.
Given, you have a mysql database called txdb_test and a table users with a username
column.
package main
import (
"database/sql"
"log"
"github.com/DATA-DOG/go-txdb"
_ "github.com/go-sql-driver/mysql"
)
func init() {
// we register an sql driver named "txdb"
txdb.Register("txdb", "mysql", "root@/txdb_test")
}
func main() {
// dsn serves as an unique identifier for connection pool
db, err := sql.Open("txdb", "identifier")
if err != nil {
log.Fatal(err)
}
defer db.Close()
if _, err := db.Exec(`INSERT INTO users(username) VALUES("gopher")`); err != nil {
log.Fatal(err)
}
}
Every time you will run this application, it will remain in the same state as before.
Testing
Usage is mainly intended for testing purposes. See the db_test.go as an example.
In order to run tests, you need a mysql database with a root access without password locally.
make test
Documentation
See godoc for general API details.
See .travis.yml for supported go versions.
Contributions
Feel free to open a pull request. Note, if you wish to contribute an extension to public (exported methods or types) -
please open an issue before to discuss whether these changes can be accepted. All backward incompatible changes are
and will be treated cautiously.
The public API is locked since it is an sql.Driver and will not change.
License
txdb is licensed under the three clause BSD license