sqlalchemy.dialects.oracle.cx_oracle.OracleDialect_cx_oracle

Undocumented

Undocumented

Undocumented

Retrieve the server version info from the given connection.

This is used by the default implementation to populate the "server_version_info" attribute and is called exactly once upon first connect.

Undocumented

Build DB-API compatible connection arguments.

Given a .URL object, returns a tuple consisting of a (*args, **kwargs) suitable to send directly to the dbapi's connect function. The arguments are sent to the .Dialect.connect method which then runs the DBAPI-level connect() function.

The method typically makes use of the .URL.translate_connect_args method in order to generate a dictionary of options.

The default implementation is:

def create_connect_args(self, url):
    opts = url.translate_connect_args()
    opts.update(url.query)
    return [[], opts]

create a two-phase transaction ID.

this id will be passed to do_begin_twophase(), do_rollback_twophase(), do_commit_twophase(). its format is unspecified.

invoke the cursor.setinputsizes() method with appropriate arguments

This hook is called if the dialect.use_inputsizes flag is set to True. Parameter data is passed in a list of tuples (paramname, dbtype, sqltype), where paramname is the key of the parameter in the statement, dbtype is the DBAPI datatype and sqltype is the SQLAlchemy type. The order of tuples is in the correct parameter order.

Given a DBAPI connection, return its isolation level.

When working with a _engine.Connection object, the corresponding DBAPI connection may be procured using the _engine.Connection.connection accessor.

Note that this is a dialect-level method which is used as part of the implementation of the _engine.Connection and _engine.Engine isolation level facilities; these APIs should be preferred for most typical use cases.

Called during strategized creation of the dialect with a connection.

Allows dialects to configure options based on server version info or other properties.

The connection passed here is a SQLAlchemy Connection object, with full capabilities.

The initialize() method of the base dialect should be called via super().

return a callable which sets up a newly created DBAPI connection.

The callable should accept a single argument "conn" which is the DBAPI connection itself. The inner callable has no return value.

E.g.:

class MyDialect(default.DefaultDialect):
    # ...

    def on_connect(self):
        def do_on_connect(connection):
            connection.execute("SET SPECIAL FLAGS etc")

        return do_on_connect

This is used to set dialect-wide per-connection options such as isolation modes, Unicode modes, etc.

The "do_on_connect" callable is invoked by using the _events.PoolEvents.connect event hook, then unwrapping the DBAPI connection and passing it into the callable.

If None is returned, no event listener is generated.

Given a DBAPI connection, set its isolation level.

Note that this is a dialect-level method which is used as part of the implementation of the _engine.Connection and _engine.Engine isolation level facilities; these APIs should be preferred for most typical use cases.