Fix insert with default value for mysql

callback_create.go

@@ -97,8 +97,9 @@ func createCallback(scope *Scope) {
 
 		if len(columns) == 0 {
 			scope.Raw(fmt.Sprintf(
-				"INSERT INTO %v DEFAULT VALUES%v%v",
+				"INSERT INTO %v %v%v%v",
 				quotedTableName,
+				scope.Dialect().DefaultValueStr(),
 				addExtraSpaceIfExist(extraOption),
 				addExtraSpaceIfExist(lastInsertIDReturningSuffix),
 			))

create_test.go

@@ -62,6 +62,17 @@ func TestCreate(t *testing.T) {
 	}
 }
 
+func TestCreateEmptyStrut(t *testing.T) {
+	type EmptyStruct struct {
+		ID uint
+	}
+	DB.AutoMigrate(&EmptyStruct{})
+
+	if err := DB.Create(&EmptyStruct{}).Error; err != nil {
+		t.Errorf("No error should happen when creating user, but got %v", err)
+	}
+}
+
 func TestCreateWithExistingTimestamp(t *testing.T) {
 	user := User{Name: "CreateUserExistingTimestamp"}
 

dialect.go

@@ -42,6 +42,8 @@ type Dialect interface {
 	SelectFromDummyTable() string
 	// LastInsertIdReturningSuffix most dbs support LastInsertId, but postgres needs to use `RETURNING`
 	LastInsertIDReturningSuffix(tableName, columnName string) string
+	// DefaultValueStr
+	DefaultValueStr() string
 
 	// BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
 	BuildKeyName(kind, tableName string, fields ...string) string

dialect_common.go

@@ -159,6 +159,10 @@ func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) s
 	return ""
 }
 
+func (commonDialect) DefaultValueStr() string {
+	return "DEFAULT VALUES"
+}
+
 // BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
 func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string {
 	keyName := fmt.Sprintf("%s_%s_%s", kind, tableName, strings.Join(fields, "_"))

dialect_mysql.go

@@ -185,3 +185,7 @@ func (s mysql) BuildKeyName(kind, tableName string, fields ...string) string {
 
 	return fmt.Sprintf("%s%x", string(destRunes), bs)
 }
+
+func (mysql) DefaultValueStr() string {
+	return "VALUES()"
+}

dialects/mssql/mssql.go

@@ -183,6 +183,10 @@ func (mssql) LastInsertIDReturningSuffix(tableName, columnName string) string {
 	return ""
 }
 
+func (mssql) DefaultValueStr() string {
+	return "DEFAULT VALUES"
+}
+
 func currentDatabaseAndTable(dialect gorm.Dialect, tableName string) (string, string) {
 	if strings.Contains(tableName, ".") {
 		splitStrings := strings.SplitN(tableName, ".", 2)