So I'm looking for any reliable method to "ping" the database and know that connection is alive. I've checked a psycopg2 documentation but can't find anything like that. Sure I can issue some simple SQL statement like SELECT 1 and catch the exception, but I hope there is a native method, something like PHP pg_connection_status
17.03.2020 · Now, if you open a psycopg2 connection and you carefully watch at the output of the aforementioned psql command, you will of course see an extra line while the connection is opened (compared to a closed psycopg2 connection). In an example on my system, the line which corresponds to the connection open by psycogp2 looks like:
The. psycopg2. module content. ¶. The module interface respects the standard defined in the DB API 2.0. psycopg2.connect(dsn=None, connection_factory=None, cursor_factory=None, async=False, **kwargs) ¶. Create a new database session and return a new connection object. The connection parameters can be specified as a libpq connection string ...
Jun 06, 2017 · If you want control on the wait you can go in green mode, write your own select-based callback and play with the socket to check if it's alive (how? no idea). So, this is a TCP problem, on top of which there is the libpq, on top of which there is psycopg. psycopg doesn't have a precanned solution for your problem: there are workarounds ...
The following are 30 code examples for showing how to use psycopg2.connect(). These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
pg_connection_statusis implemented using PQstatus. psycopg doesn't expose that API, so the check is not available. The only two places psycopg calls PQstatus itself is when a new connection is made, and at the beginning of execute. So yes, you will need to issue a simple SQL statement to find out whether the connection is still there.
09.08.2018 · Use the psycopg2.connect method with the required arguments to connect MySQL. It would return an Connection object if the connection established successfully Use the cursor method Create a cursor object using the connection object returned by the connect method to execute PostgreSQL queries from Python.
The cursor_factory argument can be used to create non-standard cursors. The class returned must be a subclass of psycopg2.extensions.cursor.See Connection and cursor factories for details. A default factory for the connection can also …
The following are 30 code examples for showing how to use psycopg2.connect(). These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
It is possible to find the connection in other status than the one shown below. Those are the only states in which a working connection is expected to be found during the execution of regular Python client code: other states are for internal usage and Python code should not rely on them. psycopg2.extensions. STATUS_READY ¶ Connection established.
28.03.2016 · I've seen #369 and I was wondering if the status has changed, and if not what is the currently recommanded way to handle that ? This question on stackoverflow has several answers , but they all...
class psycopg2.extensions.connection(dsn, async=False) ¶. Is the class usually returned by the connect () function. It is exposed by the extensions module in order to allow subclassing to extend its behaviour: the subclass should be passed to the connect () function using the connection_factory parameter.
pg_connection_statusis implemented using PQstatus. psycopg doesn't expose that API, so the check is not available. The only two places psycopg calls PQstatus itself is when a new connection is made, and at the beginning of execute. So yes, you will need to issue a simple SQL statement to find out whether the connection is still there.
Connections can be used as context managers. Note that a context wraps a transaction: if the context exits with success the transaction is committed, if it ...
So I'm looking for any reliable method to "ping" the database and know that connection is alive. I've checked a psycopg2 documentation but can't find anything like that. Sure I can issue some simple SQL statement like SELECT 1 and catch the exception, but I hope there is a native method, something like PHP pg_connection_status. Thanks.
09.03.2021 · Psycopg2 python PostgreSQL connection pool. The Psycopg2 module provides four classes to manage a connection pool. i.e., It has ready-to-use classes to create and manage the connection pool directly. Alternatively, we can implement your connection pool implementation using its abstract class.
The psycopg2 module content¶. The module interface respects the standard defined in the DB API 2.0.. psycopg2. connect (dsn=None, connection_factory=None, cursor_factory=None, async=False, \*\*kwargs) ¶ Create a new database session and return a new connection object.. The connection parameters can be specified as a libpq connection string using the dsn …