コード例 #1
0
ファイル: evaluator.go プロジェクト: mrtoms/tidb
func (e *Evaluator) funcDateArith(v *ast.FuncDateArithExpr) bool {
	// health check for date and interval
	nodeDate := v.Date.GetValue()
	if types.IsNil(nodeDate) {
		v.SetValue(nil)
		return true
	}
	nodeInterval := v.Interval.GetValue()
	if types.IsNil(nodeInterval) {
		v.SetValue(nil)
		return true
	}
	// parse date
	fieldType := mysql.TypeDate
	var resultField *types.FieldType
	switch x := nodeDate.(type) {
	case mysql.Time:
		if (x.Type == mysql.TypeDatetime) || (x.Type == mysql.TypeTimestamp) {
			fieldType = mysql.TypeDatetime
		}
	case string:
		if !mysql.IsDateFormat(x) {
			fieldType = mysql.TypeDatetime
		}
	case int64:
		if t, err := mysql.ParseTimeFromInt64(x); err == nil {
			if (t.Type == mysql.TypeDatetime) || (t.Type == mysql.TypeTimestamp) {
				fieldType = mysql.TypeDatetime
			}
		}
	}
	if mysql.IsClockUnit(v.Unit) {
		fieldType = mysql.TypeDatetime
	}
	resultField = types.NewFieldType(fieldType)
	resultField.Decimal = mysql.MaxFsp
	value, err := types.Convert(nodeDate, resultField)
	if err != nil {
		e.err = ErrInvalidOperation.Gen("DateArith invalid args, need date but get %T", nodeDate)
		return false
	}
	if types.IsNil(value) {
		e.err = ErrInvalidOperation.Gen("DateArith invalid args, need date but get %v", value)
		return false
	}
	result, ok := value.(mysql.Time)
	if !ok {
		e.err = ErrInvalidOperation.Gen("DateArith need time type, but got %T", value)
		return false
	}
	// parse interval
	var interval string
	if strings.ToLower(v.Unit) == "day" {
		day, err2 := parseDayInterval(nodeInterval)
		if err2 != nil {
			e.err = ErrInvalidOperation.Gen("DateArith invalid day interval, need int but got %T", nodeInterval)
			return false
		}
		interval = fmt.Sprintf("%d", day)
	} else {
		interval = fmt.Sprintf("%v", nodeInterval)
	}
	year, month, day, duration, err := mysql.ExtractTimeValue(v.Unit, interval)
	if err != nil {
		e.err = errors.Trace(err)
		return false
	}
	if v.Op == ast.DateSub {
		year, month, day, duration = -year, -month, -day, -duration
	}
	result.Time = result.Time.Add(duration)
	result.Time = result.Time.AddDate(int(year), int(month), int(day))
	if result.Time.Nanosecond() == 0 {
		result.Fsp = 0
	}
	v.SetValue(result)
	return true
}
コード例 #2
0
ファイル: builtin_time.go プロジェクト: astaxie/tidb
func builtinDateArith(args []types.Datum, ctx context.Context) (d types.Datum, err error) {
	// Op is used for distinguishing date_add and date_sub.
	// args[0] -> Op
	// args[1] -> Date
	// args[2] -> DateArithInterval
	// health check for date and interval
	if args[1].Kind() == types.KindNull {
		d.SetNull()
		return d, nil
	}
	nodeDate := args[1]
	nodeInterval := args[2].GetInterface().(ast.DateArithInterval)
	nodeIntervalIntervalDatum := nodeInterval.Interval.GetDatum()
	if nodeIntervalIntervalDatum.Kind() == types.KindNull {
		d.SetNull()
		return d, nil
	}
	// parse date
	fieldType := mysql.TypeDate
	var resultField *types.FieldType
	switch nodeDate.Kind() {
	case types.KindMysqlTime:
		x := nodeDate.GetMysqlTime()
		if (x.Type == mysql.TypeDatetime) || (x.Type == mysql.TypeTimestamp) {
			fieldType = mysql.TypeDatetime
		}
	case types.KindString:
		x := nodeDate.GetString()
		if !mysql.IsDateFormat(x) {
			fieldType = mysql.TypeDatetime
		}
	case types.KindInt64:
		x := nodeDate.GetInt64()
		if t, err1 := mysql.ParseTimeFromInt64(x); err1 == nil {
			if (t.Type == mysql.TypeDatetime) || (t.Type == mysql.TypeTimestamp) {
				fieldType = mysql.TypeDatetime
			}
		}
	}
	if mysql.IsClockUnit(nodeInterval.Unit) {
		fieldType = mysql.TypeDatetime
	}
	resultField = types.NewFieldType(fieldType)
	resultField.Decimal = mysql.MaxFsp
	value, err := nodeDate.ConvertTo(resultField)
	if err != nil {
		d.SetNull()
		return d, ErrInvalidOperation.Gen("DateArith invalid args, need date but get %T", nodeDate)
	}
	if value.Kind() == types.KindNull {
		d.SetNull()
		return d, ErrInvalidOperation.Gen("DateArith invalid args, need date but get %v", value.GetValue())
	}
	if value.Kind() != types.KindMysqlTime {
		d.SetNull()
		return d, ErrInvalidOperation.Gen("DateArith need time type, but got %T", value.GetValue())
	}
	result := value.GetMysqlTime()
	// parse interval
	var interval string
	if strings.ToLower(nodeInterval.Unit) == "day" {
		day, err1 := parseDayInterval(*nodeIntervalIntervalDatum)
		if err1 != nil {
			d.SetNull()
			return d, ErrInvalidOperation.Gen("DateArith invalid day interval, need int but got %T", nodeIntervalIntervalDatum.GetString())
		}
		interval = fmt.Sprintf("%d", day)
	} else {
		if nodeIntervalIntervalDatum.Kind() == types.KindString {
			interval = fmt.Sprintf("%v", nodeIntervalIntervalDatum.GetString())
		} else {
			ii, err1 := nodeIntervalIntervalDatum.ToInt64()
			if err1 != nil {
				d.SetNull()
				return d, errors.Trace(err1)
			}
			interval = fmt.Sprintf("%v", ii)
		}
	}
	year, month, day, duration, err := mysql.ExtractTimeValue(nodeInterval.Unit, interval)
	if err != nil {
		d.SetNull()
		return d, errors.Trace(err)
	}
	op := args[0].GetInterface().(ast.DateArithType)
	if op == ast.DateSub {
		year, month, day, duration = -year, -month, -day, -duration
	}
	result.Time = result.Time.Add(duration)
	result.Time = result.Time.AddDate(int(year), int(month), int(day))
	if result.Time.Nanosecond() == 0 {
		result.Fsp = 0
	}
	d.SetMysqlTime(result)
	return d, nil
}