What if I don’t close the database connection in Python SQLite

In answer to the specific question of what happens if you do not close a SQLite database, the answer is quite simple and applies to using SQLite in any programming language. When the connection is closed explicitly by code or implicitly by program exit then any outstanding transaction is rolled back. (The rollback is actually … Read more

Is there a timeout for idle PostgreSQL connections?

It sounds like you have a connection leak in your application because it fails to close pooled connections. You aren’t having issues just with <idle> in transaction sessions, but with too many connections overall. Killing connections is not the right answer for that, but it’s an OK-ish temporary workaround. Rather than re-starting PostgreSQL to boot … Read more

Why do I need Transaction in Hibernate for read-only operations?

Transactions for reading might look indeed strange and often people don’t mark methods for transactions in this case. But JDBC will create transaction anyway, it’s just it will be working in autocommit=true if different option wasn’t set explicitly. But there are practical reasons to mark transactions read-only: Impact on databases Read-only flag may let DBMS … Read more

ExecuteReader requires an open and available Connection. The connection’s current state is Connecting

Sorry for only commenting in the first place, but i’m posting almost every day a similar comment since many people think that it would be smart to encapsulate ADO.NET functionality into a DB-Class(me too 10 years ago). Mostly they decide to use static/shared objects since it seems to be faster than to create a new … Read more

Closing database connections in Java

When you are done with using your Connection, you need to explicitly close it by calling its close() method in order to release any other database resources (cursors, handles, etc.) the connection may be holding on to. Actually, the safe pattern in Java is to close your ResultSet, Statement, and Connection (in that order) in … Read more

What is the format for the PostgreSQL connection string / URL?

If you use Libpq binding for respective language, according to its documentation URI is formed as follows: postgresql://[user[:password]@][netloc][:port][/dbname][?param1=value1&…] Here are examples from same document postgresql:// postgresql://localhost postgresql://localhost:5432 postgresql://localhost/mydb postgresql://user@localhost postgresql://user:secret@localhost postgresql://other@localhost/otherdb?connect_timeout=10&application_name=myapp postgresql://localhost/mydb?user=other&password=secret

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)