f(db)
	}

	if stmt.SQL.Len() > 0 {
		db.Logger.Trace(stmt.Context, curTime, func() (string, int64) {
			sql, vars := stmt.SQL.String(), stmt.Vars
			if filter, ok := db.Logger.(ParamsFilter); ok {
				sql, vars = filter.ParamsFilter(stmt.Context, stmt.SQL.String(), stmt.Vars...)
			}
			return db.Dialector.Explain(sql, vars...), db.RowsAffected
		}, db.Error)
	}

	if !stmt.DB.DryRun {

		} else {
			l.Printf(l.traceStr, utils.FileWithLineNum(), float64(elapsed.Nanoseconds())/1e6, rows, sql)
		}
	}
}

// ParamsFilter filter params
func (l *logger) ParamsFilter(ctx context.Context, sql string, params ...interface{}) (string, []interface{}) {
	if l.Config.ParameterizedQueries {
		return sql, nil
	}
	return sql, params
}

	// currently it is only supported for mysql driver
	if !isMysql() {
		return
	}

	const tblName = "cities"
	const tblSchema = "gorm"
	const tblType = "BASE TABLE"
	const tblComment = "foobar comment"

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

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

	if err := DB.Set("gorm:table_options",