b.ResetTimer()
	for x := 0; x < b.N; x++ {
		DB.Raw("select * from users where id = ?", user.ID).Scan(&u)
	}
}

func BenchmarkScanSlice(b *testing.B) {
	DB.Exec("delete from users")
	for i := 0; i < 10_000; i++ {
		user := *GetUser(fmt.Sprintf("scan-%d", i), Config{})
		DB.Create(&user)
	}

	var u []User
	b.ResetTimer()
	for x := 0; x < b.N; x++ {
		DB.Raw("select * from users").Scan(&u)
	}
}

}

func (cs *callbacks) Delete() *processor {
	return cs.processors["delete"]
}

func (cs *callbacks) Row() *processor {
	return cs.processors["row"]
}

func (cs *callbacks) Raw() *processor {
	return cs.processors["raw"]
}

func (p *processor) Execute(db *DB) *DB {
	// call scopes
	for len(db.Statement.scopes) > 0 {
		db = db.executeScopes()
	}

	var (
		curTime           = time.Now()

			db.AddError(field.Set(db.Statement.Context, reflectValue, values[idx]))
		} else { // joinFields count is larger than 2 when using join
			var isNilPtrValue bool
			var relValue reflect.Value
			// does not contain raw dbname
			nestedJoinSchemas := joinFields[idx][:len(joinFields[idx])-1]
			// current reflect value
			currentReflectValue := reflectValue
			fullRels := make([]string, 0, len(nestedJoinSchemas))

// NegationExpressionBuilder negation expression builder
type NegationExpressionBuilder interface {
	NegationBuild(builder Builder)
}

// Expr raw expression
type Expr struct {
	SQL                string
	Vars               []interface{}
	WithoutParentheses bool
}

// Build build raw expression
func (expr Expr) Build(builder Builder) {
	var (
		afterParenthesis bool
		idx              int
	)

				if db.Statement.Schema == nil {
					clauseSelect.Columns[idx] = clause.Column{Name: name, Raw: true}
				} else if f := db.Statement.Schema.LookUpField(name); f != nil {
					clauseSelect.Columns[idx] = clause.Column{Name: f.DBName}
				} else {
					clauseSelect.Columns[idx] = clause.Column{Name: name, Raw: true}
				}
			}
		} else if db.Statement.Schema != nil && len(db.Statement.Omits) > 0 {

	PrimaryColumn = Column{Table: CurrentTable, Name: PrimaryKey}
)

// Column quote with name
type Column struct {
	Table string
	Name  string
	Alias string
	Raw   bool
}

// Table quote with name
type Table struct {
	Name  string
	Alias string
	Raw   bool

// For example, values that can pass this regular expression are:
// - "123"
// - "abc456"
// -"%$#@789"
var regFullDataType = regexp.MustCompile(`\D*(\d+)\D?`)

// TODO:? Create const vars for raw sql queries ?

var _ gorm.Migrator = (*Migrator)(nil)

// Migrator m struct
type Migrator struct {
	Config
}

// Config schema config
type Config struct {
	CreateIndexAfterCreateTable bool

func (db *DB) Group(name string) (tx *DB) {
	tx = db.getInstance()

	fields := strings.FieldsFunc(name, utils.IsValidDBNameChar)
	tx.Statement.AddClause(clause.GroupBy{
		Columns: []clause.Column{{Name: name, Raw: len(fields) != 1}},
	})
	return
}

// Having specify HAVING conditions for GROUP BY
//
//	// Select the sum age of users with name jinzhu

	}
	return db
}

// Exec executes raw sql
func (db *DB) Exec(sql string, values ...interface{}) (tx *DB) {
	tx = db.getInstance()
	tx.Statement.SQL = strings.Builder{}

	if strings.Contains(sql, "@") {
		clause.NamedExpr{SQL: sql, Vars: values}.Build(tx.Statement)
	} else {
		clause.Expr{SQL: sql, Vars: values}.Build(tx.Statement)
	}

	return tx.callbacks.Raw().Execute(tx)

	})

	if len(results) != 2 || results[0].Name != user2.Name || results[1].Name != user3.Name {
		t.Errorf("Scan into struct map, got %#v", results)
	}

	type ID uint64
	var id ID
	DB.Raw("select id from users where id = ?", user2.ID).Scan(&id)
	if uint(id) != user2.ID {
		t.Errorf("Failed to scan to customized data type")
	}

	var resInt interface{}
	resInt = &User{}