isSameType = true
					break
				}
			}

			if !isSameType {
				alterColumn = true
			}
		}
	}

	if !isSameType {
		// check size
		if length, ok := columnType.Length(); length != int64(field.Size) {
			if length > 0 && field.Size > 0 {
				alterColumn = true
			} else {
				// has size in data type and not equal

							appendToElems(obj)
						}
					}
				case reflect.Struct:
					appendToElems(db.Statement.ReflectValue)
				}

				// optimize elems of reflect value length
				if elemLen := elems.Len(); elemLen > 0 {
					if v, ok := selectColumns[rel.Name+".*"]; !ok || v {
						saveAssociations(db, rel, distinctElems, selectColumns, restricted, nil)
					}

	reflectValue := reflect.Indirect(reflect.ValueOf(value))

	switch reflectValue.Kind() {
	case reflect.Slice, reflect.Array:
		var rowsAffected int64
		tx = db.getInstance()

		// the reflection length judgment of the optimized value
		reflectLen := reflectValue.Len()

		callFc := func(tx *DB) error {
			for i := 0; i < reflectLen; i += batchSize {
				ends := i + batchSize
				if ends > reflectLen {

						conds = append(conds, clause.Eq{Column: key, Value: v[key]})
					} else if _, ok := v[key].(Valuer); ok {
						conds = append(conds, clause.Eq{Column: key, Value: v[key]})
					} else {
						// optimize reflect value length
						valueLen := reflectValue.Len()
						values := make([]interface{}, valueLen)
						for i := 0; i < valueLen; i++ {
							values[i] = reflectValue.Index(i).Interface()
						}

		if err = d.Apply(config); err != nil {
			return
		}
	}

	if config.NamingStrategy == nil {
		config.NamingStrategy = schema.NamingStrategy{IdentifierMaxLength: 64} // Default Identifier length is 64
	}

	if config.Logger == nil {
		config.Logger = logger.Default
	}

	if config.NowFunc == nil {
		config.NowFunc = func() time.Time { return time.Now().Local() }
	}