func (db *DB) Update(column string, value interface{}) (tx *DB) {
	tx = db.getInstance()
	tx.Statement.Dest = map[string]interface{}{column: value}
	return tx.callbacks.Update().Execute(tx)
}

// Updates updates attributes using callbacks. values must be a struct or map. Reference: https://gorm.io/docs/update.html#Update-Changed-Fields

//
// Offset conditions can be cancelled by using `Offset(-1)`.
//
//	// select the third user
//	db.Offset(2).First(&user)
//	// select the first user by cancelling an earlier chained offset
//	db.Offset(5).Offset(-1).First(&user)
func (db *DB) Offset(offset int) (tx *DB) {
	tx = db.getInstance()
	tx.Statement.AddClause(clause.Limit{Offset: offset})
	return
}

		StringBool   string
		SmallintBool int `gorm:"type:smallint"`
	}

	type ColumnStruct2 struct {
		gorm.Model
		Name         string
		StringBool   bool // change existing boolean column from string to boolean
		SmallintBool bool // change existing boolean column from smallint or other to boolean
	}

	DB.Migrator().DropTable(&ColumnStruct{})

	if err := DB.AutoMigrate(&ColumnStruct{}); err != nil {

	}
}

// Changed check model changed or not when updating
func (stmt *Statement) Changed(fields ...string) bool {
	modelValue := stmt.ReflectValue
	switch modelValue.Kind() {
	case reflect.Slice, reflect.Array:
		modelValue = stmt.ReflectValue.Index(stmt.CurDestIndex)
	}

	selectColumns, restricted := stmt.SelectAndOmitColumns(false, true)
	changed := func(field *schema.Field) bool {

	})
	assertEqualSQL(t, `SELECT * FROM "users" WHERE id = 100 AND "users"."deleted_at" IS NULL ORDER BY age desc LIMIT 10`, sql)

	// after model changed
	if DB.Statement.DryRun || DB.DryRun {
		t.Fatal("Failed expect DB.DryRun and DB.Statement.ToSQL to be false")
	}

	if DB.Statement.SQL.String() != "" {
		t.Fatal("Failed expect DB.Statement.SQL to be empty")