HDBC-mysql-0.6.2: MySQL driver for HDBC



This module provides a MySQL driver for the HDBC database interface. To use it, invoke the connectMySQL method to create an Database.HDBC.IConnection that you can use to interact with a MySQL database. Use the defaultMySQLConnectInfo, overriding the default values as necessary.

 import Control.Monad
 import Database.HDBC
 import Database.HDBC.MySQL
 main = do conn <- connectMySQL defaultMySQLConnectInfo {
                        mysqlHost     = "db1.example.com",
                        mysqlUser     = "scott",
                        mysqlPassword = "tiger"

           rows <- quickQuery' conn "SELECT 1 + 1" []
           forM_ rows $ \row -> putStrLn $ show row

There are some important caveats to note about this driver.

The first relates to transaction support. The MySQL server supports a variety of backend "engines", only some of which support transactional access (e.g., InnoDB). This driver will report that the database supports transactions. Should you decide to make use of the transactional support in the HDBC API, it is up to you to make sure that you use a MySQL engine that supports transactions.

The next relates to dates and times. MySQL does not store time zone information in DATETIME or TIMESTAMP columns: instead, it assumes that all dates are stored in the "server's time zone". At some point in the future, this driver may query for the server's time zone and apply appropriate time zone conversion to these datatypes. For now, it simply treats all times as UTC; i.e., it assumes the server's time zone is UTC.



connectMySQL :: MySQLConnectInfo -> IO ConnectionSource

Connects to a MySQL database using the specified connection information.

data MySQLConnectInfo Source

Connection information to use with connectMySQL.

You must either supply a host and port, or the full path to a Unix socket.




mysqlHost :: String

The server's hostname; e.g., "db1.example.com"

mysqlUser :: String

The MySQL username to use for login; e.g., "scott"

mysqlPassword :: String

The MySQL password to use for login; e.g., "tiger"

mysqlDatabase :: String

the "default" database name; e.g., "emp"

mysqlPort :: Int

The port on which to connect to the server; e.g., 3306

mysqlUnixSocket :: String

The absolute path of the server's Unix socket; e.g., "/var/lib/mysql.sock"

defaultMySQLConnectInfo :: MySQLConnectInfoSource

Typical connection information, meant to be overridden partially, for example:

 connectMySQL defaultMySQLConnectInfo { mysqlHost = "db1" }

In particular, the default values are "" as the host, 3306 as the port, "root" as the user, no password, and "test" as the default database.