func (o querySet) WithContext(ctx context.Context) QuerySeter {
	o.ctx = ctx
	o.forContext = true
	return &o
}
set context to QuerySeter.
package orm
import (
	"context"
	"fmt"
)
type colValue struct {
	value int64
	opt   operator
}
type operator int
const (
	ColAdd operator = iota
	ColMinus
	ColMultiply
	ColExcept
)
func ColValue(opt operator, value interface{}) interface{} {
	switch opt {
	case ColAdd, ColMinus, ColMultiply, ColExcept:
	default:
		panic(fmt.Errorf("orm.ColValue wrong operator"))
	}
	v, err := StrTo(ToStr(value)).Int64()
	if err != nil {
		panic(fmt.Errorf("orm.ColValue doesn't support non string/numeric type, %s", err))
	}
	var val colValue
	val.value = v
	val.opt = opt
	return val
}
type querySet struct {
	mi         *modelInfo
	cond       *Condition
	related    []string
	relDepth   int
	limit      int64
	offset     int64
	groups     []string
	orders     []string
	distinct   bool
	forupdate  bool
	orm        *orm
	ctx        context.Context
	forContext bool
}
var _ QuerySeter = new(querySet)
func (o querySet) Filter(expr string, args ...interface{}) QuerySeter {
	if o.cond == nil {
		o.cond = NewCondition()
	}
	o.cond = o.cond.And(expr, args...)
	return &o
}
func (o querySet) FilterRaw(expr string, sql string) QuerySeter {
	if o.cond == nil {
		o.cond = NewCondition()
	}
	o.cond = o.cond.Raw(expr, sql)
	return &o
}
func (o querySet) Exclude(expr string, args ...interface{}) QuerySeter {
	if o.cond == nil {
		o.cond = NewCondition()
	}
	o.cond = o.cond.AndNot(expr, args...)
	return &o
}
func (o *querySet) setOffset(num interface{}) {
	o.offset = ToInt64(num)
}
func (o querySet) Limit(limit interface{}, args ...interface{}) QuerySeter {
	o.limit = ToInt64(limit)
	if len(args) > 0 {
		o.setOffset(args[0])
	}
	return &o
}
func (o querySet) Offset(offset interface{}) QuerySeter {
	o.setOffset(offset)
	return &o
}
func (o querySet) GroupBy(exprs ...string) QuerySeter {
	o.groups = exprs
	return &o
}
func (o querySet) OrderBy(exprs ...string) QuerySeter {
	o.orders = exprs
	return &o
}
func (o querySet) Distinct() QuerySeter {
	o.distinct = true
	return &o
}
func (o querySet) ForUpdate() QuerySeter {
	o.forupdate = true
	return &o
}
func (o querySet) RelatedSel(params ...interface{}) QuerySeter {
	if len(params) == 0 {
		o.relDepth = DefaultRelsDepth
	} else {
		for _, p := range params {
			switch val := p.(type) {
			case string:
				o.related = append(o.related, val)
			case int:
				o.relDepth = val
			default:
				panic(fmt.Errorf("<QuerySeter.RelatedSel> wrong param kind: %v", val))
			}
		}
	}
	return &o
}
func (o querySet) SetCond(cond *Condition) QuerySeter {
	o.cond = cond
	return &o
}
func (o querySet) GetCond() *Condition {
	return o.cond
}
func (o *querySet) Count() (int64, error) {
	return o.orm.alias.DbBaser.Count(o.orm.db, o, o.mi, o.cond, o.orm.alias.TZ)
}
func (o *querySet) Exist() bool {
	cnt, _ := o.orm.alias.DbBaser.Count(o.orm.db, o, o.mi, o.cond, o.orm.alias.TZ)
	return cnt > 0
}
func (o *querySet) Update(values Params) (int64, error) {
	return o.orm.alias.DbBaser.UpdateBatch(o.orm.db, o, o.mi, o.cond, values, o.orm.alias.TZ)
}
func (o *querySet) Delete() (int64, error) {
	return o.orm.alias.DbBaser.DeleteBatch(o.orm.db, o, o.mi, o.cond, o.orm.alias.TZ)
}
func (o *querySet) PrepareInsert() (Inserter, error) {
	return newInsertSet(o.orm, o.mi)
}
func (o *querySet) All(container interface{}, cols ...string) (int64, error) {
	return o.orm.alias.DbBaser.ReadBatch(o.orm.db, o, o.mi, o.cond, container, o.orm.alias.TZ, cols)
}
func (o *querySet) One(container interface{}, cols ...string) error {
	o.limit = 1
	num, err := o.orm.alias.DbBaser.ReadBatch(o.orm.db, o, o.mi, o.cond, container, o.orm.alias.TZ, cols)
	if err != nil {
		return err
	}
	if num == 0 {
		return ErrNoRows
	}
	if num > 1 {
		return ErrMultiRows
	}
	return nil
}
func (o *querySet) Values(results *[]Params, exprs ...string) (int64, error) {
	return o.orm.alias.DbBaser.ReadValues(o.orm.db, o, o.mi, o.cond, exprs, results, o.orm.alias.TZ)
}
func (o *querySet) ValuesList(results *[]ParamsList, exprs ...string) (int64, error) {
	return o.orm.alias.DbBaser.ReadValues(o.orm.db, o, o.mi, o.cond, exprs, results, o.orm.alias.TZ)
}
func (o *querySet) ValuesFlat(result *ParamsList, expr string) (int64, error) {
	return o.orm.alias.DbBaser.ReadValues(o.orm.db, o, o.mi, o.cond, []string{expr}, result, o.orm.alias.TZ)
}
func (o *querySet) RowsToMap(result *Params, keyCol, valueCol string) (int64, error) {
	panic(ErrNotImplement)
}
func (o *querySet) RowsToStruct(ptrStruct interface{}, keyCol, valueCol string) (int64, error) {
	panic(ErrNotImplement)
}