add mysql insert modifiers (#2269)

callback_create.go

@@ -83,11 +83,18 @@ func createCallback(scope *Scope) {
 			quotedTableName = scope.QuotedTableName()
 			primaryField    = scope.PrimaryField()
 			extraOption     string
+			insertModifier  string
 		)
 
 		if str, ok := scope.Get("gorm:insert_option"); ok {
 			extraOption = fmt.Sprint(str)
 		}
+		if str, ok := scope.Get("gorm:insert_modifier"); ok {
+			insertModifier = strings.ToUpper(fmt.Sprint(str))
+			if insertModifier == "INTO" {
+				insertModifier = ""
+			}
+		}
 
 		if primaryField != nil {
 			returningColumn = scope.Quote(primaryField.DBName)
@@ -97,7 +104,8 @@ func createCallback(scope *Scope) {
 
 		if len(columns) == 0 {
 			scope.Raw(fmt.Sprintf(
-				"INSERT INTO %v %v%v%v",
+				"INSERT %v INTO %v %v%v%v",
+				addExtraSpaceIfExist(insertModifier),
 				quotedTableName,
 				scope.Dialect().DefaultValueStr(),
 				addExtraSpaceIfExist(extraOption),
@@ -105,7 +113,8 @@ func createCallback(scope *Scope) {
 			))
 		} else {
 			scope.Raw(fmt.Sprintf(
-				"INSERT INTO %v (%v) VALUES (%v)%v%v",
+				"INSERT %v INTO %v (%v) VALUES (%v)%v%v",
+				addExtraSpaceIfExist(insertModifier),
 				scope.QuotedTableName(),
 				strings.Join(columns, ","),
 				strings.Join(placeholders, ","),

create_test.go

@@ -229,3 +229,20 @@ func TestOmitWithCreate(t *testing.T) {
 		t.Errorf("Should not create omitted relationships")
 	}
 }
+
+func TestCreateIgnore(t *testing.T) {
+	float := 35.03554004971999
+	now := time.Now()
+	user := User{Name: "CreateUser", Age: 18, Birthday: &now, UserNum: Num(111), PasswordHash: []byte{'f', 'a', 'k', '4'}, Latitude: float}
+
+	if !DB.NewRecord(user) || !DB.NewRecord(&user) {
+		t.Error("User should be new record before create")
+	}
+
+	if count := DB.Create(&user).RowsAffected; count != 1 {
+		t.Error("There should be one record be affected when create record")
+	}
+	if DB.Dialect().GetName() == "mysql" && DB.Set("gorm:insert_modifier", "IGNORE").Create(&user).Error != nil {
+		t.Error("Should ignore duplicate user insert by insert modifier:IGNORE ")
+	}
+}