pq: fix Connector example test

The connector's example had one rudimental if-err check and used
confusing variable names, e.g. "name" instead of "dsn".
This change makes the example to be in line with examples of Go's database/sql.

Author: narqo

connector_example_test.go

@@ -4,26 +4,24 @@ package pq_test
 
 import (
 	"database/sql"
-	"fmt"
+	"log"
 
 	"github.com/lib/pq"
 )
 
 func ExampleNewConnector() {
-	name := ""
-	connector, err := pq.NewConnector(name)
+	c, err := pq.NewConnector("postgres://")
 	if err != nil {
-		fmt.Println(err)
-		return
+		log.Fatalf("could not create connector: %v", err)
 	}
-	db := sql.OpenDB(connector)
+
+	db := sql.OpenDB(c)
 	defer db.Close()
 
 	// Use the DB
-	txn, err := db.Begin()
+	tx, err := db.Begin()
 	if err != nil {
-		fmt.Println(err)
-		return
+		log.Fatalf("could not start transaction: %v", err)
 	}
-	txn.Rollback()
+	tx.Rollback()
 }

notice_example_test.go

@@ -11,23 +11,25 @@ import (
 )
 
 func ExampleConnectorWithNoticeHandler() {
-	name := ""
 	// Base connector to wrap
-	base, err := pq.NewConnector(name)
+	base, err := pq.NewConnector("postgres://")
 	if err != nil {
 		log.Fatal(err)
 	}
+
 	// Wrap the connector to simply print out the message
 	connector := pq.ConnectorWithNoticeHandler(base, func(notice *pq.Error) {
 		fmt.Println("Notice sent: " + notice.Message)
 	})
 	db := sql.OpenDB(connector)
 	defer db.Close()
+
 	// Raise a notice
 	sql := "DO language plpgsql $$ BEGIN RAISE NOTICE 'test notice'; END $$"
 	if _, err := db.Exec(sql); err != nil {
 		log.Fatal(err)
 	}
+
 	// Output:
 	// Notice sent: test notice
 }