type BeforeCreateInterface interface {
	BeforeCreate(*gorm.DB) error
}

type AfterCreateInterface interface {
	AfterCreate(*gorm.DB) error
}

type BeforeUpdateInterface interface {
	BeforeUpdate(*gorm.DB) error
}

type AfterUpdateInterface interface {
	AfterUpdate(*gorm.DB) error
}

type BeforeSaveInterface interface {
	BeforeSave(*gorm.DB) error
}

type AfterSaveInterface interface {

}

func (S Tracer) LogMode(level logger.LogLevel) logger.Interface {
	return S.Logger.LogMode(level)
}

func (S Tracer) Info(ctx context.Context, s string, i ...interface{}) {
	S.Logger.Info(ctx, s, i...)
}

func (S Tracer) Warn(ctx context.Context, s string, i ...interface{}) {
	S.Logger.Warn(ctx, s, i...)
}

// Scan implements the Scanner interface.
func (n *DeletedAt) Scan(value interface{}) error {
	return (*sql.NullTime)(n).Scan(value)
}

// Value implements the driver Valuer interface.
func (n DeletedAt) Value() (driver.Value, error) {
	if !n.Valid {
		return nil, nil
	}
	return n.Time, nil
}

func (n DeletedAt) MarshalJSON() ([]byte, error) {
	if n.Valid {
		return json.Marshal(n.Time)
	}
	return json.Marshal(nil)

	"reflect"
	"strings"

	"gorm.io/gorm"
	"gorm.io/gorm/clause"
	"gorm.io/gorm/schema"
	"gorm.io/gorm/utils"
)

func SaveBeforeAssociations(create bool) func(db *gorm.DB) {
	return func(db *gorm.DB) {
		if db.Error == nil && db.Statement.Schema != nil {
			selectColumns, restricted := db.Statement.SelectAndOmitColumns(create, !create)

			// Save Belongs To associations
			for _, rel := range db.Statement.Schema.Relationships.BelongsTo {

		if results := DB.Create(&u1); results.Error != nil {
			t.Fatalf("errors happened on create: %v", results.Error)
		} else if results.RowsAffected != 1 {
			t.Fatalf("rows affected expects: %v, got %v", 1, results.RowsAffected)
		} else if u1.ID == 0 {
			t.Fatalf("ID expects : not equal 0, got %v", u1.ID)
		}

		got := user{}
		results := DB.First(&got, "id = ?", u1.ID)
		if results.Error != nil {

	if l.LogLevel >= Warn {
		l.Printf(l.warnStr+msg, append([]interface{}{utils.FileWithLineNum()}, data...)...)
	}
}

// Error print error messages
func (l *logger) Error(ctx context.Context, msg string, data ...interface{}) {
	if l.LogLevel >= Error {
		l.Printf(l.errStr+msg, append([]interface{}{utils.FileWithLineNum()}, data...)...)
	}
}

// Trace print sql message
//
//nolint:cyclop

	if !ok && tx.DryRun {
		db.Logger.Error(tx.Statement.Context, ErrDryRunModeUnsupported.Error())
	}
	return row
}

func (db *DB) Rows() (*sql.Rows, error) {
	tx := db.getInstance().Set("rows", true)
	tx = tx.callbacks.Row().Execute(tx)
	rows, ok := tx.Statement.Dest.(*sql.Rows)
	if !ok && tx.DryRun && tx.Error == nil {
		tx.Error = ErrDryRunModeUnsupported
	}
	return rows, tx.Error
}

		t.Errorf("errors happened when delete: %v", err)
	}

	if err := DB.Delete(&User{}).Error; err != gorm.ErrMissingWhereClause {
		t.Errorf("errors happened when delete: %v", err)
	}

	if err := DB.Where("id = ?", users[0].ID).First(&result).Error; err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		t.Errorf("should returns record not found error, but got %v", err)
	}
}

func TestDeleteWithTable(t *testing.T) {

	ColumnTypes(dst interface{}) ([]ColumnType, error)

	// Views
	CreateView(name string, option ViewOption) error
	DropView(name string) error

	// Constraints
	CreateConstraint(dst interface{}, name string) error
	DropConstraint(dst interface{}, name string) error
	HasConstraint(dst interface{}, name string) bool

	// Indexes
	CreateIndex(dst interface{}, name string) error

)

func BeginTransaction(db *gorm.DB) {
	if !db.Config.SkipDefaultTransaction && db.Error == nil {
		if tx := db.Begin(); tx.Error == nil {
			db.Statement.ConnPool = tx.Statement.ConnPool
			db.InstanceSet("gorm:started_transaction", true)
		} else if tx.Error == gorm.ErrInvalidTransaction {
			tx.Error = nil
		} else {
			db.Error = tx.Error
		}
	}
}

func CommitOrRollbackTransaction(db *gorm.DB) {