Implement driver.Pinger

The Pinger interface was added in Go 1.8.

This implementation ignores the context parameter to Ping.

Author: edsrzf

connection_go18.go

@@ -0,0 +1,11 @@
+// +build go1.8
+
+package mysql
+
+import (
+	"context"
+)
+
+func (mc *mysqlConn) Ping(ctx context.Context) error {
+	return mc.writeCommandPacket(comPing)
+}

driver_go18_test.go

@@ -3,7 +3,9 @@
 package mysql
 
 import (
+	"context"
 	"database/sql"
+	"database/sql/driver"
 	"fmt"
 	"reflect"
 	"testing"
@@ -188,3 +190,18 @@ func TestSkipResults(t *testing.T) {
 		}
 	})
 }
+
+func TestPing(t *testing.T) {
+	runTests(t, dsn, func(dbt *DBTest) {
+		mysqlDriver := dbt.db.Driver().(driver.Driver)
+		conn, err := mysqlDriver.Open(dsn)
+		if err != nil {
+			dbt.Fatalf("error opening conn: %s", err)
+		}
+		pinger := conn.(driver.Pinger)
+		err = pinger.Ping(context.Background())
+		if err != nil {
+			dbt.Fatalf("error on ping: %s", err)
+		}
+	})
+}