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# Configuring the JDBC pool.

The Play JDBC datasource is managed by [HikariCP](https://brettwooldridge.github.io/HikariCP/).

## Special URLs

Play supports special url format for both **MySQL** and **PostgreSQL**:

```
# To configure MySQL
db.default.url="mysql://user:password@localhost/database"

# To configure PostgreSQL
db.default.url="postgres://user:password@localhost/database"
```

A non-standard port of the database service can be specified:

```
# To configure MySQL running in Docker
db.default.url="mysql://user:password@localhost:port/database"

# To configure PostgreSQL running in Docker
db.default.url="postgres://user:password@localhost:port/database"
```

## Reference

In addition to the classical `driver`, `url`, `username`, `password` configuration properties, it also supports additional tuning parameters if you need them.  The `play.db.prototype` configuration from the Play JDBC `reference.conf` is used as the prototype for the configuration for all database connections.  The defaults for all the available configuration options can be seen here:

@[](/confs/play-jdbc/reference.conf)

When you need to specify some settings for a connection pool, you can override the prototype settings.  For example, to set maximumPoolSize for HikariCP, you would set the following in your `application.conf` file:

```
play.db.prototype.hikaricp.maximumPoolSize = 15
```
