advanced patterns When Using Context with Go's SQL Driver - Queries Hanging
I'm refactoring my project and I just started working with I'm a bit lost with I tried several approaches but none seem to work... This might be a silly question, but I'm experiencing an scenario where queries using Go's `database/sql` package with context are hanging indefinitely. I have a simple application that connects to a PostgreSQL database, and I'm attempting to implement timeouts for my queries using `context.WithTimeout`. Here’s the relevant code snippet: ```go package main import ( "context" "database/sql" "fmt" "log" _ "github.com/lib/pq" "time" ) func main() { connStr := "user=youruser dbname=yourdb sslmode=disable" db, err := sql.Open("postgres", connStr) 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 pg_sleep(5); SELECT 'Done';").Scan(&result) if err != nil { log.Fatal("Query failed: ", err) } fmt.Println(result) } ``` In this code, I’m intentionally delaying the query execution with `pg_sleep(5)` to test the timeout functionality. However, I’m observing that the query hangs without returning an behavior, even after the timeout period has elapsed. The expected behavior, according to the documentation, is that the context should trigger a cancellation after 2 seconds, but it seems like the query continues to run. I’ve also verified that the PostgreSQL connection is correctly set up and that no other queries are interfering. I have tried different timeout durations and using a simple SELECT query instead, but the behavior remains the same. Additionally, I’ve confirmed that the `context` is being passed correctly to the query. Does anyone have insights into why the context doesn’t appear to be working as intended with the SQL driver, or is there a different way I should structure my queries to ensure that they respect the cancellation context? Any advice would be greatly appreciated! For context: I'm using Go on Ubuntu. I'm working on a API that needs to handle this. How would you solve this? I've been using Go for about a year now. Any advice would be much appreciated. Is there a better approach?