From b5aa106145768b1d671e1afb2ddc59d7e32c9bde Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sun, 20 Jan 2019 11:26:46 +0800
Subject: [PATCH] refactor error

---
 error.go     | 2 ++
 statement.go | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/error.go b/error.go
index a223fc4a..a67527ac 100644
--- a/error.go
+++ b/error.go
@@ -26,6 +26,8 @@ var (
 	ErrNotImplemented = errors.New("Not implemented")
 	// ErrConditionType condition type unsupported
 	ErrConditionType = errors.New("Unsupported condition type")
+	// ErrUnSupportedSQLType parameter of SQL is not supported
+	ErrUnSupportedSQLType = errors.New("unsupported sql type")
 )
 
 // ErrFieldIsNotExist columns does not exist
diff --git a/statement.go b/statement.go
index 96679a87..ec43ce56 100644
--- a/statement.go
+++ b/statement.go
@@ -133,7 +133,7 @@ func (statement *Statement) SQL(query interface{}, args ...interface{}) *Stateme
 		statement.RawSQL = query.(string)
 		statement.RawParams = args
 	default:
-		statement.lastError = errors.New("unsupported sql type")
+		statement.lastError = ErrUnSupportedSQLType
 	}
 
 	return statement