Handling Context Timeouts with Go's `database/sql` - Connection Cleanup Issues
I'm updating my dependencies and I've looked through the documentation and I'm still confused about I'm relatively new to this, so bear with me. I'm working with a question where my Go application doesn't seem to properly clean up database connections when a context timeout occurs. I'm using Go 1.20 with the `database/sql` package and a PostgreSQL database. My code looks something like this: ```go package main import ( "context" "database/sql" "log" "time" _ "github.com/lib/pq" ) func main() { dsn := "user=foo dbname=bar sslmode=disable" db, err := sql.Open("postgres", dsn) if err != nil { log.Fatal(err) } defer db.Close() ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) defer cancel() var result string err = db.QueryRowContext(ctx, "SELECT value FROM my_table WHERE id = $1", 1).Scan(&result) if err != nil { if err == context.DeadlineExceeded { log.Println("Query timed out") } else { log.Println(err) } return } log.Println("Query Result:", result) } ``` I expect that if the query takes longer than 2 seconds, it should log a timeout message and clean up any open connections. However, I notice that the connections remain open in the PostgreSQL server, and over time, this leads to connection exhaustion. I've tried setting the `SetMaxOpenConns` and `SetMaxIdleConns` on my database connection pool, but that hasn't resolved the scenario. Here's how I set the connection limit: ```go db.SetMaxOpenConns(5) db.SetMaxIdleConns(2) ``` Even with these limits, I still see open connections in the database long after the context has timed out. I would appreciate any insights or best practices for handling context timeouts effectively with `database/sql` to ensure that resources are cleaned up properly. Could it be that I'm missing something in the way I'm handling the context or the database connection configuration? What are your experiences with this? I appreciate any insights!