django使用DBUtils实现连接池

DATABASES = {
    "default": {
        "ENGINE": "db_pool.db.backends.mysql",
        "NAME": "xxx",
        "USER": "xxx",
        "PASSWORD": "xxx",
        "HOST": "mysql",
        "PORT": "3306",
        "ATOMIC_REQUESTS": True,
        "CHARSET": "utf8",
        "COLLATION": "utf8_bin",
        "POOL": {
            "mincached": 5,
            "maxcached ": 500,
        }
    }
}

mincached: initial number of idle connections in the pool
    (0 means no connections are made at startup)
maxcached: maximum number of idle connections in the pool
    (0 or None means unlimited pool size)
maxshared: maximum number of shared connections
    (0 or None means all connections are dedicated)
    When this maximum number is reached, connections are
    shared if they have been requested as shareable.
maxconnections: maximum number of connections generally allowed
    (0 or None means an arbitrary number of connections)
blocking: determines behavior when exceeding the maximum
    (if this is set to true, block and wait until the number of
    connections decreases, otherwise an error will be reported)
maxusage: maximum number of reuses of a single connection
    (0 or None means unlimited reuse)
    When this maximum usage number of the connection is reached,
    the connection is automatically reset (closed and reopened).
setsession: optional list of SQL commands that may serve to prepare
    the session, e.g. ["set datestyle to ...", "set time zone ..."]
reset: how connections should be reset when returned to the pool
    (False or None to rollback transcations started with begin(),
    True to always issue a rollback for safety's sake)
failures: an optional exception class or a tuple of exception classes
    for which the connection failover mechanism shall be applied,
    if the default (OperationalError, InternalError) is not adequate
ping: determines when the connection should be checked with ping()
    (0 = None = never, 1 = default = whenever fetched from the pool,
    2 = when a cursor is created, 4 = when a query is executed,
    7 = always, and all other bit combinations of these values)