Fix nits pointed in pull request.

Author: methane

Diff for: connection.go

@@ -176,7 +176,7 @@ func (mc *mysqlConn) escapeBytes(v []byte) string {
 	return "'" + string(escape(v)) + "'"
 }
 
-func (mc *mysqlConn) buildQuery(query string, args []driver.Value) (string, error) {
+func (mc *mysqlConn) interpolateParams(query string, args []driver.Value) (string, error) {
 	chunks := strings.Split(query, "?")
 	if len(chunks) != len(args)+1 {
 		return "", driver.ErrSkip
@@ -196,7 +196,7 @@ func (mc *mysqlConn) buildQuery(query string, args []driver.Value) (string, erro
 		case int64:
 			parts[pos] = strconv.FormatInt(v, 10)
 		case float64:
-			parts[pos] = strconv.FormatFloat(v, 'f', -1, 64)
+			parts[pos] = strconv.FormatFloat(v, 'g', -1, 64)
 		case bool:
 			if v {
 				parts[pos] = "1"
@@ -211,11 +211,7 @@ func (mc *mysqlConn) buildQuery(query string, args []driver.Value) (string, erro
 				parts[pos] = v.In(mc.cfg.loc).Format(fmt)
 			}
 		case []byte:
-			if v == nil {
-				parts[pos] = "NULL"
-			} else {
-				parts[pos] = mc.escapeBytes(v)
-			}
+			parts[pos] = mc.escapeBytes(v)
 		case string:
 			parts[pos] = mc.escapeBytes([]byte(v))
 		default:
@@ -242,7 +238,7 @@ func (mc *mysqlConn) Exec(query string, args []driver.Value) (driver.Result, err
 			return nil, driver.ErrSkip
 		}
 		// try client-side prepare to reduce roundtrip
-		prepared, err := mc.buildQuery(query, args)
+		prepared, err := mc.interpolateParams(query, args)
 		if err != nil {
 			return nil, err
 		}

Diff for: const.go

@@ -138,7 +138,7 @@ type statusFlag uint16
 const (
 	statusInTrans statusFlag = 1 << iota
 	statusInAutocommit
-	statusUnknown1
+	statusReserved // Not in documentation
 	statusMoreResultsExists
 	statusNoGoodIndexUsed
 	statusNoIndexUsed