postgresql

问题 We have a hosted PostgreSQL, with no access to the system or *.conf files. I do have a admin access and can connect to it using Oracle SQL developer. Can I run any command to increase the max_connections. All other parameters seems to be ok shared mem and buffers can hold more connections so there is not problem there. 回答1: Changing max_connection parameter needs a Postgres restart Commands Check max_connection just to keep current value in mind SHOW max_connections; Change max_connection

问题 We have a hosted PostgreSQL, with no access to the system or *.conf files. I do have a admin access and can connect to it using Oracle SQL developer. Can I run any command to increase the max_connections. All other parameters seems to be ok shared mem and buffers can hold more connections so there is not problem there. 回答1: Changing max_connection parameter needs a Postgres restart Commands Check max_connection just to keep current value in mind SHOW max_connections; Change max_connection

问题 I have SQL query which joins 3 tables, one being just a many-to-many connecting the other two. I use a Spring JDBC ResultSetExtractor to convert the ResultSet into my Objects which look roughly like this: class Customer { private String id; private Set<AccountType> accountTypes; ... } The ResultSetExtractor implementation looks like this: public List<Client> extractData(ResultSet rs) throws SQLException, DataAccessException { Map<Integer, Client> clientsMap = new LinkedHashMap<Integer, Client

问题 I'm attempting to update several rows at once using a tuple of tuples. I figured out how to construct the sql statement from this post, but implementing it in psycopg2 has proven to be more challenging. Here's what I have: c = db.cursor() new_values = (("Richard",29),("Ronald",30)) sql = """UPDATE my_table AS t SET name = e.name FROM (VALUES %s) AS e(name, id) WHERE e.id = t.id;""" c.execute(sql, (new_values,)) The result is an error: ProgrammingError: table "e" has 1 columns available but 2

问题 I have an endpoint that joins the user and user_emails table as a one-to-many relationship (postgresql). It look as follows. router.get('/', function (req, res, next) { db.select('users.id', 'users.name', 'user_emails.address') .from('users') .leftJoin('user_emails', 'users.id', 'user_emails.user_id') .then(users => res.status(200).json(users)) .catch(next) // go to error handler }); However, this will return a new document for each email address. What I want is an array of documents that

问题 I have an endpoint that joins the user and user_emails table as a one-to-many relationship (postgresql). It look as follows. router.get('/', function (req, res, next) { db.select('users.id', 'users.name', 'user_emails.address') .from('users') .leftJoin('user_emails', 'users.id', 'user_emails.user_id') .then(users => res.status(200).json(users)) .catch(next) // go to error handler }); However, this will return a new document for each email address. What I want is an array of documents that

问题 I have an endpoint that joins the user and user_emails table as a one-to-many relationship (postgresql). It look as follows. router.get('/', function (req, res, next) { db.select('users.id', 'users.name', 'user_emails.address') .from('users') .leftJoin('user_emails', 'users.id', 'user_emails.user_id') .then(users => res.status(200).json(users)) .catch(next) // go to error handler }); However, this will return a new document for each email address. What I want is an array of documents that

问题 I have an endpoint that joins the user and user_emails table as a one-to-many relationship (postgresql). It look as follows. router.get('/', function (req, res, next) { db.select('users.id', 'users.name', 'user_emails.address') .from('users') .leftJoin('user_emails', 'users.id', 'user_emails.user_id') .then(users => res.status(200).json(users)) .catch(next) // go to error handler }); However, this will return a new document for each email address. What I want is an array of documents that

问题 I have an endpoint that joins the user and user_emails table as a one-to-many relationship (postgresql). It look as follows. router.get('/', function (req, res, next) { db.select('users.id', 'users.name', 'user_emails.address') .from('users') .leftJoin('user_emails', 'users.id', 'user_emails.user_id') .then(users => res.status(200).json(users)) .catch(next) // go to error handler }); However, this will return a new document for each email address. What I want is an array of documents that

问题 We are having a debate about the best way to store a timestamp in postgres. Currently all time stamps are stored as +00 and we have a timezone associated with each client. We look up the timezone and convert the time that something happened which increases complexity as we need to do more joins and a more complex query. Another method is connecting to Postgres and setting the timezone of the connection and it changes all the times to be that timezone. My problem with this is that in ANZ there