chore: add command to run examples

Makefile

@@ -1,4 +1,5 @@
 ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
+EXAMPLE_GO_MOD_DIRS := $(shell find ./example/ -type f -name 'go.mod' -exec dirname {} \; | sort)
 
 test:
 	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
@@ -21,3 +22,9 @@ go_mod_tidy:
 fmt:
 	gofmt -w -s ./
 	goimports -w  -local github.com/uptrace/bun ./
+
+run-examples:
+	set -e; for dir in $(EXAMPLE_GO_MOD_DIRS); do \
+	  echo "go run . in $${dir}"; \
+	  (cd "$${dir}" && go run .); \
+	done

example/pg-listen/main.go

@@ -21,15 +21,19 @@ func main() {
 	db := bun.NewDB(sqldb, pgdialect.New())
 	db.AddQueryHook(bundebug.NewQueryHook(bundebug.WithVerbose(true)))
 
+	ln := pgdriver.NewListener(db)
+
 	go func() {
-		for tm := range time.Tick(time.Second) {
-			if err := pgdriver.Notify(ctx, db, "mychan1", tm.Format(time.RFC3339)); err != nil {
+		for i := 0; i < 3; i++ {
+			payload := time.Now().Format(time.RFC3339)
+			if err := pgdriver.Notify(ctx, db, "mychan1", payload); err != nil {
 				panic(err)
 			}
+			time.Sleep(time.Second)
 		}
+		_ = ln.Close()
 	}()
 
-	ln := pgdriver.NewListener(db)
 	if err := ln.Listen(ctx, "mychan1", "mychan2"); err != nil {
 		panic(err)
 	}