Golang mysqldef.ParseTimeFromNum函数代码示例

func getTimeValue(ctx context.Context, v interface{}, tp byte, fsp int) (interface{}, error) {
	value := mysql.Time{
		Type: tp,
		Fsp:  fsp,
	}

	defaultTime, err := getSystemTimestamp(ctx)
	if err != nil {
		return nil, errors.Trace(err)
	}

	switch x := v.(type) {
	case string:
		if x == CurrentTimestamp {
			value.Time = defaultTime
		} else if x == ZeroTimestamp {
			value, _ = mysql.ParseTimeFromNum(0, tp, fsp)
		} else {
			value, err = mysql.ParseTime(x, tp, fsp)
			if err != nil {
				return nil, errors.Trace(err)
			}
		}
	case Value:
		switch xval := x.Val.(type) {
		case string:
			value, err = mysql.ParseTime(xval, tp, fsp)
			if err != nil {
				return nil, errors.Trace(err)
			}
		case int64:
			value, err = mysql.ParseTimeFromNum(int64(xval), tp, fsp)
			if err != nil {
				return nil, errors.Trace(err)
			}
		case nil:
			return nil, nil
		default:
			return nil, errors.Trace(errDefaultValue)
		}
	case *Ident:
		if x.Equal(CurrentTimeExpr) {
			return CurrentTimestamp, nil
		}

		return nil, errors.Trace(errDefaultValue)
	case *UnaryOperation:
		// support some expression, like `-1`
		m := map[interface{}]interface{}{}
		v := Eval(x, nil, m)
		ft := types.NewFieldType(mysql.TypeLonglong)
		xval, err := types.Convert(v, ft)
		if err != nil {
			return nil, errors.Trace(err)
		}

		value, err = mysql.ParseTimeFromNum(xval.(int64), tp, fsp)
		if err != nil {
			return nil, errors.Trace(err)
		}
	default:
		return nil, nil
	}

	return value, nil
}

// Convert converts the val with type tp.
func Convert(val interface{}, target *FieldType) (v interface{}, err error) { //NTYPE
	tp := target.Tp
	if val == nil {
		return nil, nil
	}
	switch tp { // TODO: implement mysql types convert when "CAST() AS" syntax are supported.
	case mysql.TypeFloat:
		x, err := ToFloat64(val)
		if err != nil {
			return invConv(val, tp)
		}
		if target.Flen != UnspecifiedLength {
			x, err = TruncateFloat(x, target.Flen, target.Decimal)
			if err != nil {
				return nil, errors.Trace(err)
			}
		}
		return float32(x), nil
	case mysql.TypeDouble:
		x, err := ToFloat64(val)
		if err != nil {
			return invConv(val, tp)
		}
		if target.Flen != UnspecifiedLength {
			x, err = TruncateFloat(x, target.Flen, target.Decimal)
			if err != nil {
				return nil, errors.Trace(err)
			}
		}
		return float64(x), nil
	case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob,
		mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString:
		x, err := ToString(val)
		if err != nil {
			return invConv(val, tp)
		}
		// TODO: consider target.Charset/Collate
		x = truncateStr(x, target.Flen)
		if target.Charset == charset.CharsetBin {
			return []byte(x), nil
		}
		return x, nil
	case mysql.TypeDuration:
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		switch x := val.(type) {
		case mysql.Duration:
			return x.RoundFrac(fsp)
		case mysql.Time:
			t, err := x.ConvertToDuration()
			if err != nil {
				return nil, errors.Trace(err)
			}

			return t.RoundFrac(fsp)
		case string:
			return mysql.ParseDuration(x, fsp)
		default:
			return invConv(val, tp)
		}
	case mysql.TypeTimestamp, mysql.TypeDatetime, mysql.TypeDate:
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		switch x := val.(type) {
		case mysql.Time:
			t, err := x.Convert(tp)
			if err != nil {
				return nil, errors.Trace(err)
			}
			return t.RoundFrac(fsp)
		case mysql.Duration:
			t, err := x.ConvertToTime(tp)
			if err != nil {
				return nil, errors.Trace(err)
			}
			return t.RoundFrac(fsp)
		case string:
			return mysql.ParseTime(x, tp, fsp)
		case int64:
			return mysql.ParseTimeFromNum(x, tp, fsp)
		default:
			return invConv(val, tp)
		}
	case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong:
		unsigned := mysql.HasUnsignedFlag(target.Flag)
		if unsigned {
			return convertToUint(val, target)
		}
		return convertToInt(val, target)
	case mysql.TypeBit:
		x, err := convertToUint(val, target)
		if err != nil {
			return x, errors.Trace(err)
		}

//.........这里部分代码省略.........

// CastValue casts a value based on column's type.
func (c *Col) CastValue(ctx context.Context, val interface{}) (casted interface{}, err error) {
	if val == nil {
		return
	}
	switch c.Tp {
	case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong, mysql.TypeYear, mysql.TypeBit:
		intVal, errCode := c.normalizeIntegerValue(val)
		if errCode == errCodeType {
			casted = intVal
			err = c.TypeError(val)
			return
		}
		return c.castIntegerValue(intVal, errCode)
	case mysql.TypeFloat, mysql.TypeDouble:
		return c.castFloatValue(val)
	case mysql.TypeDate, mysql.TypeDatetime, mysql.TypeTimestamp:
		switch v := val.(type) {
		case int64:
			casted, err = mysql.ParseTimeFromNum(v, c.Tp, c.Decimal)
			if err != nil {
				err = newParseColError(err, c)
			}
		case string:
			casted, err = mysql.ParseTime(v, c.Tp, c.Decimal)
			if err != nil {
				err = newParseColError(err, c)
			}
		case mysql.Time:
			var t mysql.Time
			t, err = v.Convert(c.Tp)
			if err != nil {
				err = newParseColError(err, c)
				return
			}
			casted, err = t.RoundFrac(c.Decimal)
			if err != nil {
				err = newParseColError(err, c)
			}
		default:
			err = c.TypeError(val)
		}
	case mysql.TypeDuration:
		switch v := val.(type) {
		case string:
			casted, err = mysql.ParseDuration(v, c.Decimal)
			if err != nil {
				err = newParseColError(err, c)
			}
		case mysql.Time:
			var t mysql.Duration
			t, err = v.ConvertToDuration()
			if err != nil {
				err = newParseColError(err, c)
				return
			}
			casted, err = t.RoundFrac(c.Decimal)
			if err != nil {
				err = newParseColError(err, c)
			}
		case mysql.Duration:
			casted, err = v.RoundFrac(c.Decimal)
		default:
			err = c.TypeError(val)
		}
	case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob, mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString:
		strV := ""
		switch v := val.(type) {
		case mysql.Time:
			strV = v.String()
		case mysql.Duration:
			strV = v.String()
		case []byte:
			if c.Charset == charset.CharsetBin {
				casted = v
				return
			}
			strV = string(v)
		default:
			strV = fmt.Sprintf("%v", val)
		}
		if (c.Flen != types.UnspecifiedLength) && (len(strV) > c.Flen) {
			strV = strV[:c.Flen]
		}
		casted = strV
	case mysql.TypeDecimal, mysql.TypeNewDecimal:
		switch v := val.(type) {
		case string:
			casted, err = mysql.ParseDecimal(v)
			if err != nil {
				err = newParseColError(err, c)
			}
		case int8:
			casted = mysql.NewDecimalFromInt(int64(v), 0)
		case int16:
			casted = mysql.NewDecimalFromInt(int64(v), 0)
		case int32:
			casted = mysql.NewDecimalFromInt(int64(v), 0)
		case int64:
			casted = mysql.NewDecimalFromInt(int64(v), 0)
//.........这里部分代码省略.........

// Cast casts val to certain types and does not return error.
func Cast(val interface{}, target *FieldType) (v interface{}) { //NTYPE
	tp := target.Tp
	switch tp {
	case mysql.TypeString:
		x, _ := ToString(val)
		// TODO: consider target.Charset/Collate
		x = truncateStr(x, target.Flen)
		if target.Charset == charset.CharsetBin {
			return []byte(x)
		}
		return x
	case mysql.TypeDuration:
		var dur mysql.Duration
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		switch x := val.(type) {
		case mysql.Duration:
			dur, _ = x.RoundFrac(fsp)
		case mysql.Time:
			dur, _ = x.ConvertToDuration()
			dur, _ = dur.RoundFrac(fsp)
		case string:
			dur, _ = mysql.ParseDuration(x, fsp)
		}
		return dur
	case mysql.TypeDatetime, mysql.TypeDate:
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		var t mysql.Time
		t.Type = tp
		switch x := val.(type) {
		case mysql.Time:
			t, _ = x.Convert(tp)
			t, _ = t.RoundFrac(fsp)
		case mysql.Duration:
			t, _ = x.ConvertToTime(tp)
			t, _ = t.RoundFrac(fsp)
		case string:
			t, _ = mysql.ParseTime(x, tp, fsp)
		case int64:
			t, _ = mysql.ParseTimeFromNum(x, tp, fsp)
		}
		return t
	case mysql.TypeLonglong:
		if mysql.HasUnsignedFlag(target.Flag) {
			v, _ = ToUint64(val)
		} else {
			v, _ = ToInt64(val)
		}
		return
	case mysql.TypeNewDecimal:
		x, _ := ToDecimal(val)
		if target.Decimal != UnspecifiedLength {
			x = x.Round(int32(target.Decimal))
		}
		// TODO: check Flen
		return x
	default:
		panic("should never happen")
	}
}

// Convert converts the val with type tp.
func Convert(val interface{}, target *FieldType) (v interface{}, err error) {
	tp := target.Tp
	if val == nil {
		return nil, nil
	}
	switch tp { // TODO: implement mysql types convert when "CAST() AS" syntax are supported.
	case mysql.TypeFloat:
		x, err := ToFloat64(val)
		if err != nil {
			return invConv(val, tp)
		}
		// For float and following double type, we will only truncate it for float(M, D) format.
		// If no D is set, we will handle it like origin float whether M is set or not.
		if target.Flen != UnspecifiedLength && target.Decimal != UnspecifiedLength {
			x, err = TruncateFloat(x, target.Flen, target.Decimal)
			if err != nil {
				return nil, errors.Trace(err)
			}
		}
		return float32(x), nil
	case mysql.TypeDouble:
		x, err := ToFloat64(val)
		if err != nil {
			return invConv(val, tp)
		}
		if target.Flen != UnspecifiedLength && target.Decimal != UnspecifiedLength {
			x, err = TruncateFloat(x, target.Flen, target.Decimal)
			if err != nil {
				return nil, errors.Trace(err)
			}
		}
		return float64(x), nil
	case mysql.TypeBlob, mysql.TypeTinyBlob, mysql.TypeMediumBlob, mysql.TypeLongBlob,
		mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString:
		x, err := ToString(val)
		if err != nil {
			return invConv(val, tp)
		}
		// TODO: consider target.Charset/Collate
		x = truncateStr(x, target.Flen)
		if target.Charset == charset.CharsetBin {
			return []byte(x), nil
		}
		return x, nil
	case mysql.TypeDuration:
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		switch x := val.(type) {
		case mysql.Duration:
			return x.RoundFrac(fsp)
		case mysql.Time:
			t, err := x.ConvertToDuration()
			if err != nil {
				return nil, errors.Trace(err)
			}

			return t.RoundFrac(fsp)
		case string:
			return mysql.ParseDuration(x, fsp)
		default:
			return invConv(val, tp)
		}
	case mysql.TypeTimestamp, mysql.TypeDatetime, mysql.TypeDate:
		fsp := mysql.DefaultFsp
		if target.Decimal != UnspecifiedLength {
			fsp = target.Decimal
		}
		switch x := val.(type) {
		case mysql.Time:
			t, err := x.Convert(tp)
			if err != nil {
				return nil, errors.Trace(err)
			}
			return t.RoundFrac(fsp)
		case mysql.Duration:
			t, err := x.ConvertToTime(tp)
			if err != nil {
				return nil, errors.Trace(err)
			}
			return t.RoundFrac(fsp)
		case string:
			return mysql.ParseTime(x, tp, fsp)
		case int64:
			return mysql.ParseTimeFromNum(x, tp, fsp)
		default:
			return invConv(val, tp)
		}
	case mysql.TypeTiny, mysql.TypeShort, mysql.TypeInt24, mysql.TypeLong, mysql.TypeLonglong:
		unsigned := mysql.HasUnsignedFlag(target.Flag)
		if unsigned {
			return convertToUint(val, target)
		}
		return convertToInt(val, target)
	case mysql.TypeBit:
		x, err := convertToUint(val, target)
		if err != nil {
			return x, errors.Trace(err)
//.........这里部分代码省略.........