//	// CREATE OR REPLACE VIEW `users_view` AS SELECT * FROM `users` WITH CHECK OPTION
//	q := DB.Model(&User{})
//	DB.Debug().Migrator().CreateView("user_view", gorm.ViewOption{Query: q, Replace: true, CheckOption: "WITH CHECK OPTION"})
//
// [subquery]: https://gorm.io/docs/advanced_query.html#SubQuery
func (m Migrator) CreateView(name string, option gorm.ViewOption) error {
	if option.Query == nil {
		return gorm.ErrSubQueryRequired
	}

	if locking.Table.Name != "" {
		builder.WriteString(" OF ")
		builder.WriteQuoted(locking.Table)
	}

	if locking.Options != "" {
		builder.WriteByte(' ')
		builder.WriteString(locking.Options)
	}
}

// MergeClause merge order by clauses
func (locking Locking) MergeClause(clause *Clause) {
	clause.Expression = locking

}

// Unique returns whether the index is unique or not.
func (idx Index) Unique() (unique bool, ok bool) {
	return idx.UniqueValue.Bool, idx.UniqueValue.Valid
}

// Option return the optional attribute of the index
func (idx Index) Option() string {
	return idx.OptionValue

func (db *DB) AutoMigrate(dst ...interface{}) error {
	return db.Migrator().AutoMigrate(dst...)
}

// ViewOption view option
type ViewOption struct {
	Replace     bool   // If true, exec `CREATE`. If false, exec `CREATE OR REPLACE`
	CheckOption string // optional. e.g. `WITH [ CASCADED | LOCAL ] CHECK OPTION`
	Query       *DB    // required subquery.
}

// ColumnType column type interface
type ColumnType interface {

			}
		}()

		if err = fc(tx); err == nil {
			panicked = false
			return tx.Commit().Error
		}
	}

	panicked = false
	return
}

// Begin begins a transaction with any transaction options opts
func (db *DB) Begin(opts ...*sql.TxOptions) *DB {
	var (
		// clone statement
		tx  = db.getInstance().Session(&Session{Context: db.Statement.Context, NewDB: db.clone == 1})
		opt *sql.TxOptions
		err error

	const tblComment = "foobar comment"

	type City struct {
		gorm.Model
		Name string `gorm:"unique"`
	}

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

	if err := DB.Set("gorm:table_options",
		fmt.Sprintf("ENGINE InnoDB COMMENT '%s'", tblComment)).AutoMigrate(&City{}); err != nil {
		t.Fatalf("failed to migrate cities tables, got error: %v", err)
	}

					idx.Type = index.Type
				}
				if idx.Where == "" {
					idx.Where = index.Where
				}
				if idx.Comment == "" {
					idx.Comment = index.Comment
				}
				if idx.Option == "" {
					idx.Option = index.Option
				}

				idx.Fields = append(idx.Fields, index.Fields...)
				sort.Slice(idx.Fields, func(i, j int) bool {
					return idx.Fields[i].priority < idx.Fields[j].priority
				})

	Name5        int64  `gorm:"index:,class:FULLTEXT,comment:hello \\, world,where:age > 10"`
	Name6        int64  `gorm:"index:profile,comment:hello \\, world,where:age > 10"`
	Age          int64  `gorm:"index:profile,expression:ABS(age),option:WITH PARSER parser_name"`
	OID          int64  `gorm:"index:idx_id;index:idx_oid,unique"`
	MemberNumber string `gorm:"index:idx_id,priority:1"`
	Name7        string `gorm:"index:type"`

		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Locking{Strength: clause.LockingStrengthUpdate, Options: clause.LockingOptionsNoWait}},
			"SELECT * FROM `users` FOR UPDATE NOWAIT", nil,
		},
		{
			[]clause.Interface{clause.Select{}, clause.From{}, clause.Locking{Strength: clause.LockingStrengthUpdate, Options: clause.LockingOptionsSkipLocked}},
			"SELECT * FROM `users` FOR UPDATE SKIP LOCKED", nil,
		},
	}

	if db != nil {
		for _, plugin := range c.Plugins {
			if err := plugin.Initialize(db); err != nil {
				return err
			}
		}
	}
	return nil
}

// Option gorm option interface
type Option interface {
	Apply(*Config) error
	AfterInitialize(*DB) error
}

// DB GORM DB definition
type DB struct {
	*Config
	Error        error
	RowsAffected int64
	Statement    *Statement