The ConnectionPool class

class ConnectionPool(*args, **kwargs)

Class defining a pool of database connections

MariaDB Connector/Python supports simple connection pooling. A connection pool holds a number of open connections and handles thread safety when providing connections to threads.

The size of a connection pool is configurable at creation time, but cannot be changed afterwards. The maximum size of a connection pool is limited to 64 connections.

Keyword Arguments:

• pool_name (str) – Name of connection pool

• pool_size (int)=5 – Size of pool. If not specified default value of 5 will be used. Maximum allowed number is 64.

• pool_reset_connection (bool)=True – Will reset the connection before returning it to the pool. Default value is True.

• pool_validation_interval (int)=500 – Specifies the validation interval in milliseconds after which the status of a connection requested from the pool is checked. The default values is 500 milliseconds, a value of 0 means that the status will always be checked. (Added in version 1.1.6)

ConnectionPool methods

ConnectionPool.add_connection(connection=None)

Adds a connection object to the connection pool.

In case that the pool doesn’t have a free slot or is not configured a PoolError exception will be raised.

ConnectionPool.close()

Closes connection pool and all connections.

ConnectionPool.get_connection()

Returns a connection from the connection pool or raises a PoolError exception if a connection is not available.

ConnectionPool.set_config(**kwargs)

Sets the connection configuration for the connection pool. For valid connection arguments check the mariadb.connect() method.

Note: This method doesn’t create connections in the pool. To fill the pool one has to use add_connection() ḿethod.

ConnectionPool attributes

Added in version 1.1.0.

ConnectionPool.connection_count

Returns the number of connections in connection pool.

ConnectionPool.max_size

Returns the maximum size for connection pools.

ConnectionPool.pool_size

Returns the size of the connection pool.

ConnectionPool.pool_name

Returns the name of the connection pool.

Added in version 1.1.0.

ConnectionPool.pool_reset_connection

If set to true, the connection will be reset on both client and server side after .close() method was called