Golang parser.DDate函数代码示例

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本文整理汇总了Golang中github.com/cockroachdb/cockroach/sql/parser.DDate函数的典型用法代码示例。如果您正苦于以下问题：Golang DDate函数的具体用法？Golang DDate怎么用？Golang DDate使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了DDate函数的14个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: Arg

// Arg implements the parser.Args interface.
func (p parameters) Arg(name string) (parser.Datum, bool) {
	i, err := processPositionalArgument(name)
	if err != nil {
		return nil, false
	}
	if i < 1 || int(i) > len(p) {
		return nil, false
	}
	arg := p[i-1].Payload
	if arg == nil {
		return parser.DNull, true
	}
	switch t := arg.(type) {
	case *driver.Datum_BoolVal:
		return parser.DBool(t.BoolVal), true
	case *driver.Datum_IntVal:
		return parser.DInt(t.IntVal), true
	case *driver.Datum_FloatVal:
		return parser.DFloat(t.FloatVal), true
	case *driver.Datum_BytesVal:
		return parser.DBytes(t.BytesVal), true
	case *driver.Datum_StringVal:
		return parser.DString(t.StringVal), true
	case *driver.Datum_DateVal:
		return parser.DDate(t.DateVal), true
	case *driver.Datum_TimeVal:
		return parser.DTimestamp{Time: t.TimeVal.GoTime()}, true
	case *driver.Datum_IntervalVal:
		return parser.DInterval{Duration: time.Duration(t.IntervalVal)}, true
	default:
		panic(fmt.Sprintf("unexpected type %T", t))
	}
}

开发者ID:gechong，项目名称:cockroach，代码行数:34，代码来源:executor.go

示例2: decodeTableKey

func decodeTableKey(valType parser.Datum, key []byte) (parser.Datum, []byte, error) {
	var isNull bool
	if key, isNull = encoding.DecodeIfNull(key); isNull {
		return parser.DNull, key, nil
	}
	switch valType.(type) {
	case parser.DBool:
		rkey, i, err := encoding.DecodeVarint(key)
		return parser.DBool(i != 0), rkey, err
	case parser.DInt:
		rkey, i, err := encoding.DecodeVarint(key)
		return parser.DInt(i), rkey, err
	case parser.DFloat:
		rkey, f, err := encoding.DecodeFloat(key, nil)
		return parser.DFloat(f), rkey, err
	case parser.DString:
		rkey, r, err := encoding.DecodeString(key, nil)
		return parser.DString(r), rkey, err
	case parser.DBytes:
		rkey, r, err := encoding.DecodeString(key, nil)
		return parser.DBytes(r), rkey, err
	case parser.DDate:
		rkey, t, err := encoding.DecodeVarint(key)
		return parser.DDate(t), rkey, err
	case parser.DTimestamp:
		rkey, t, err := encoding.DecodeTime(key)
		return parser.DTimestamp{Time: t}, rkey, err
	case parser.DInterval:
		rkey, d, err := encoding.DecodeVarint(key)
		return parser.DInterval{Duration: time.Duration(d)}, rkey, err
	default:
		return nil, nil, util.Errorf("TODO(pmattis): decoded index key: %s", valType.Type())
	}
}

开发者ID:xnyan，项目名称:cockroach，代码行数:34，代码来源:table.go

示例3: datumFromProto

func datumFromProto(d driver.Datum) parser.Datum {
	arg := d.Payload
	if arg == nil {
		return parser.DNull
	}
	switch t := arg.(type) {
	case *driver.Datum_BoolVal:
		return parser.DBool(t.BoolVal)
	case *driver.Datum_IntVal:
		return parser.DInt(t.IntVal)
	case *driver.Datum_FloatVal:
		return parser.DFloat(t.FloatVal)
	case *driver.Datum_DecimalVal:
		dd := &parser.DDecimal{}
		if _, ok := dd.SetString(t.DecimalVal); !ok {
			panic(fmt.Sprintf("could not parse string %q as decimal", t.DecimalVal))
		}
		return dd
	case *driver.Datum_BytesVal:
		return parser.DBytes(t.BytesVal)
	case *driver.Datum_StringVal:
		return parser.DString(t.StringVal)
	case *driver.Datum_DateVal:
		return parser.DDate(t.DateVal)
	case *driver.Datum_TimeVal:
		return parser.DTimestamp{Time: t.TimeVal.GoTime()}
	case *driver.Datum_IntervalVal:
		return parser.DInterval{Duration: time.Duration(t.IntervalVal)}
	default:
		panic(fmt.Sprintf("unexpected type %T", t))
	}
}

开发者ID:danieldeb，项目名称:cockroach，代码行数:32，代码来源:server.go

示例4: datumFromProto

func datumFromProto(d driver.Datum) parser.Datum {
	arg := d.Payload
	if arg == nil {
		return parser.DNull
	}
	switch t := arg.(type) {
	case *driver.Datum_BoolVal:
		return parser.DBool(t.BoolVal)
	case *driver.Datum_IntVal:
		return parser.DInt(t.IntVal)
	case *driver.Datum_FloatVal:
		return parser.DFloat(t.FloatVal)
	case *driver.Datum_DecimalVal:
		dec, err := decimal.NewFromString(t.DecimalVal)
		if err != nil {
			panic(fmt.Sprintf("could not parse decimal: %v", err))
		}
		return parser.DDecimal{Decimal: dec}
	case *driver.Datum_BytesVal:
		return parser.DBytes(t.BytesVal)
	case *driver.Datum_StringVal:
		return parser.DString(t.StringVal)
	case *driver.Datum_DateVal:
		return parser.DDate(t.DateVal)
	case *driver.Datum_TimeVal:
		return parser.DTimestamp{Time: t.TimeVal.GoTime()}
	case *driver.Datum_IntervalVal:
		return parser.DInterval{Duration: time.Duration(t.IntervalVal)}
	default:
		panic(fmt.Sprintf("unexpected type %T", t))
	}
}

开发者ID:alaypatel07，项目名称:cockroach，代码行数:32，代码来源:server.go

示例5: unmarshalColumnValue

// unmarshalColumnValue decodes the value from a key-value pair using the type
// expected by the column. An error is returned if the value's type does not
// match the column's type.
func unmarshalColumnValue(kind ColumnType_Kind, value *roachpb.Value) (parser.Datum, *roachpb.Error) {
	if value == nil {
		return parser.DNull, nil
	}

	switch kind {
	case ColumnType_BOOL:
		v, err := value.GetInt()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DBool(v != 0), nil
	case ColumnType_INT:
		v, err := value.GetInt()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DInt(v), nil
	case ColumnType_FLOAT:
		v, err := value.GetFloat()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DFloat(v), nil
	case ColumnType_STRING:
		v, err := value.GetBytes()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DString(v), nil
	case ColumnType_BYTES:
		v, err := value.GetBytes()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DBytes(v), nil
	case ColumnType_DATE:
		v, err := value.GetInt()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DDate(v), nil
	case ColumnType_TIMESTAMP:
		v, err := value.GetTime()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DTimestamp{Time: v}, nil
	case ColumnType_INTERVAL:
		v, err := value.GetInt()
		if err != nil {
			return nil, roachpb.NewError(err)
		}
		return parser.DInterval{Duration: time.Duration(v)}, nil
	default:
		return nil, roachpb.NewErrorf("unsupported column type: %s", kind)
	}
}

开发者ID:xnyan，项目名称:cockroach，代码行数:61，代码来源:table.go

示例6: DecodeTableValue

// DecodeTableValue decodes a value encoded by EncodeTableValue.
func DecodeTableValue(a *DatumAlloc, valType parser.Datum, b []byte) (parser.Datum, []byte, error) {
	// TODO(dan): Merge this and DecodeTableKey.
	if len(b) == 0 {
		return nil, nil, util.Errorf("empty slice")
	}
	if roachpb.ValueType(b[0]) == roachpb.ValueType_NULL {
		return parser.DNull, b[1:], nil
	}
	var err error
	switch valType.(type) {
	case *parser.DBool:
		var i int64
		b, i, err = roachpb.DecodeIntValue(b)
		// No need to chunk allocate DBool as MakeDBool returns either
		// parser.DBoolTrue or parser.DBoolFalse.
		return parser.MakeDBool(parser.DBool(i != 0)), b, err
	case *parser.DInt:
		var i int64
		b, i, err = roachpb.DecodeIntValue(b)
		return a.NewDInt(parser.DInt(i)), b, err
	case *parser.DFloat:
		var f float64
		b, f, err = roachpb.DecodeFloatValue(b)
		return a.NewDFloat(parser.DFloat(f)), b, err
	case *parser.DDecimal:
		var d *inf.Dec
		b, d, err = roachpb.DecodeDecimalValue(b)
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(d)
		return dd, b, err
	case *parser.DString:
		var data []byte
		b, data, err = roachpb.DecodeBytesValue(b)
		return a.NewDString(parser.DString(data)), b, err
	case *parser.DBytes:
		var data []byte
		b, data, err = roachpb.DecodeBytesValue(b)
		return a.NewDBytes(parser.DBytes(data)), b, err
	case *parser.DDate:
		var i int64
		b, i, err = roachpb.DecodeIntValue(b)
		return a.NewDDate(parser.DDate(i)), b, err
	case *parser.DTimestamp:
		var t time.Time
		b, t, err = roachpb.DecodeTimeValue(b)
		return a.NewDTimestamp(parser.DTimestamp{Time: t}), b, err
	case *parser.DTimestampTZ:
		var t time.Time
		b, t, err = roachpb.DecodeTimeValue(b)
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: t}), b, err
	case *parser.DInterval:
		var d duration.Duration
		b, d, err = roachpb.DecodeDurationValue(b)
		return a.NewDInterval(parser.DInterval{Duration: d}), b, err
	default:
		return nil, nil, util.Errorf("TODO(pmattis): decoded index value: %s", valType.Type())
	}
}

开发者ID:JKhawaja，项目名称:cockroach，代码行数:59，代码来源:table.go

示例7: DecodeTableValue

// DecodeTableValue decodes a value encoded by EncodeTableValue.
func DecodeTableValue(a *DatumAlloc, valType parser.Datum, b []byte) (parser.Datum, []byte, error) {
	_, dataOffset, _, typ, err := encoding.DecodeValueTag(b)
	if err != nil {
		return nil, b, err
	}
	if typ == encoding.Null {
		return parser.DNull, b[dataOffset:], nil
	}
	switch valType.(type) {
	case *parser.DBool:
		var x bool
		b, x, err = encoding.DecodeBoolValue(b)
		// No need to chunk allocate DBool as MakeDBool returns either
		// parser.DBoolTrue or parser.DBoolFalse.
		return parser.MakeDBool(parser.DBool(x)), b, err
	case *parser.DInt:
		var i int64
		b, i, err = encoding.DecodeIntValue(b)
		return a.NewDInt(parser.DInt(i)), b, err
	case *parser.DFloat:
		var f float64
		b, f, err = encoding.DecodeFloatValue(b)
		return a.NewDFloat(parser.DFloat(f)), b, err
	case *parser.DDecimal:
		var d *inf.Dec
		b, d, err = encoding.DecodeDecimalValue(b)
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(d)
		return dd, b, err
	case *parser.DString:
		var data []byte
		b, data, err = encoding.DecodeBytesValue(b)
		return a.NewDString(parser.DString(data)), b, err
	case *parser.DBytes:
		var data []byte
		b, data, err = encoding.DecodeBytesValue(b)
		return a.NewDBytes(parser.DBytes(data)), b, err
	case *parser.DDate:
		var i int64
		b, i, err = encoding.DecodeIntValue(b)
		return a.NewDDate(parser.DDate(i)), b, err
	case *parser.DTimestamp:
		var t time.Time
		b, t, err = encoding.DecodeTimeValue(b)
		return a.NewDTimestamp(parser.DTimestamp{Time: t}), b, err
	case *parser.DTimestampTZ:
		var t time.Time
		b, t, err = encoding.DecodeTimeValue(b)
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: t}), b, err
	case *parser.DInterval:
		var d duration.Duration
		b, d, err = encoding.DecodeDurationValue(b)
		return a.NewDInterval(parser.DInterval{Duration: d}), b, err
	default:
		return nil, nil, errors.Errorf("TODO(pmattis): decoded index value: %s", valType.Type())
	}
}

开发者ID:yangxuanjia，项目名称:cockroach，代码行数:58，代码来源:table.go

示例8: Arg

// Arg implements the parser.Args interface.
func (p parameters) Arg(name string) (parser.Datum, bool) {
	if len(name) == 0 {
		// This shouldn't happen unless the parser let through an invalid parameter
		// specification.
		panic(fmt.Sprintf("invalid empty parameter name"))
	}
	if ch := name[0]; ch < '0' || ch > '9' {
		// TODO(pmattis): Add support for named parameters (vs the numbered
		// parameter support below).
		return nil, false
	}
	i, err := strconv.ParseInt(name, 10, 0)
	if err != nil {
		return nil, false
	}
	if i < 1 || int(i) > len(p) {
		return nil, false
	}
	arg := p[i-1].Payload
	if arg == nil {
		return parser.DNull, true
	}
	switch t := arg.(type) {
	case *driver.Datum_BoolVal:
		return parser.DBool(t.BoolVal), true
	case *driver.Datum_IntVal:
		return parser.DInt(t.IntVal), true
	case *driver.Datum_FloatVal:
		return parser.DFloat(t.FloatVal), true
	case *driver.Datum_BytesVal:
		return parser.DBytes(t.BytesVal), true
	case *driver.Datum_StringVal:
		return parser.DString(t.StringVal), true
	case *driver.Datum_DateVal:
		return parser.DDate(t.DateVal), true
	case *driver.Datum_TimeVal:
		return parser.DTimestamp{Time: t.TimeVal.GoTime()}, true
	case *driver.Datum_IntervalVal:
		return parser.DInterval{Duration: time.Duration(t.IntervalVal)}, true
	default:
		panic(fmt.Sprintf("unexpected type %T", t))
	}
}

开发者ID:JonathanHub，项目名称:cockroach，代码行数:44，代码来源:executor.go

示例9: RandDatum

// RandDatum generates a random Datum of the given type.
// If null is true, the datum can be DNull.
func RandDatum(rng *rand.Rand, typ ColumnType_Kind, null bool) parser.Datum {
	if null && rng.Intn(10) == 0 {
		return parser.DNull
	}
	switch typ {
	case ColumnType_BOOL:
		return parser.MakeDBool(rng.Intn(2) == 1)
	case ColumnType_INT:
		return parser.NewDInt(parser.DInt(rng.Int63()))
	case ColumnType_FLOAT:
		return parser.NewDFloat(parser.DFloat(rng.NormFloat64()))
	case ColumnType_DECIMAL:
		d := &parser.DDecimal{}
		d.Dec.SetScale(inf.Scale(rng.Intn(40) - 20))
		d.Dec.SetUnscaled(rng.Int63())
		return d
	case ColumnType_DATE:
		return parser.NewDDate(parser.DDate(rng.Intn(10000)))
	case ColumnType_TIMESTAMP:
		return &parser.DTimestamp{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
	case ColumnType_INTERVAL:
		return &parser.DInterval{Duration: duration.Duration{Months: rng.Int63n(1000),
			Days:  rng.Int63n(1000),
			Nanos: rng.Int63n(1000000),
		}}
	case ColumnType_STRING:
		// Generate a random ASCII string.
		p := make([]byte, rng.Intn(10))
		for i := range p {
			p[i] = byte(1 + rng.Intn(127))
		}
		return parser.NewDString(string(p))
	case ColumnType_BYTES:
		p := make([]byte, rng.Intn(10))
		_, _ = rng.Read(p)
		return parser.NewDBytes(parser.DBytes(p))
	case ColumnType_TIMESTAMPTZ:
		return &parser.DTimestampTZ{Time: time.Unix(rng.Int63n(1000000), rng.Int63n(1000000))}
	default:
		panic(fmt.Sprintf("invalid type %s", typ))
	}
}

开发者ID:CubeLite，项目名称:cockroach，代码行数:44，代码来源:testutils.go

示例10: decodeOidDatum


//.........这里部分代码省略.........
				return d, err
			}
			d = parser.DFloat(f)
		case formatBinary:
			var f float32
			err := binary.Read(bytes.NewReader(b), binary.BigEndian, &f)
			if err != nil {
				return d, err
			}
			d = parser.DFloat(f)
		default:
			return d, fmt.Errorf("unsupported float4 format code: %d", code)
		}
	case oid.T_float8:
		switch code {
		case formatText:
			f, err := strconv.ParseFloat(string(b), 64)
			if err != nil {
				return d, err
			}
			d = parser.DFloat(f)
		case formatBinary:
			var f float64
			err := binary.Read(bytes.NewReader(b), binary.BigEndian, &f)
			if err != nil {
				return d, err
			}
			d = parser.DFloat(f)
		default:
			return d, fmt.Errorf("unsupported float8 format code: %d", code)
		}
	case oid.T_numeric:
		switch code {
		case formatText:
			dd := &parser.DDecimal{}
			if _, ok := dd.SetString(string(b)); !ok {
				return nil, fmt.Errorf("could not parse string %q as decimal", b)
			}
			d = dd
		default:
			return d, fmt.Errorf("unsupported numeric format code: %d", code)
		}
	case oid.T_text, oid.T_varchar:
		switch code {
		case formatText:
			d = parser.DString(b)
		default:
			return d, fmt.Errorf("unsupported text format code: %d", code)
		}
	case oid.T_bytea:
		switch code {
		case formatText:
			// http://www.postgresql.org/docs/current/static/datatype-binary.html#AEN5667
			// Code cribbed from github.com/lib/pq.

			// We only support hex encoding.
			if len(b) >= 2 && bytes.Equal(b[:2], []byte("\\x")) {
				b = b[2:] // trim off leading "\\x"
				result := make([]byte, hex.DecodedLen(len(b)))
				_, err := hex.Decode(result, b)
				if err != nil {
					return d, err
				}
				d = parser.DBytes(result)
			} else {
				return d, fmt.Errorf("unsupported bytea encoding: %q", b)
			}
		case formatBinary:
			d = parser.DBytes(b)
		default:
			return d, fmt.Errorf("unsupported bytea format code: %d", code)
		}
	case oid.T_timestamp:
		switch code {
		case formatText:
			ts, err := pq.ParseTimestamp(nil, string(b))
			if err != nil {
				return d, fmt.Errorf("could not parse string %q as timestamp", b)
			}
			d = parser.DTimestamp{Time: ts}
		case formatBinary:
			return d, fmt.Errorf("unsupported timestamp format code: %d", code)
		}
	case oid.T_date:
		switch code {
		case formatText:
			ts, err := pq.ParseTimestamp(nil, string(b))
			if err != nil {
				return d, fmt.Errorf("could not parse string %q as date", b)
			}
			daysSinceEpoch := ts.Unix() / secondsInDay
			d = parser.DDate(daysSinceEpoch)
		case formatBinary:
			return d, fmt.Errorf("unsupported date format code: %d", code)
		}
	default:
		return d, fmt.Errorf("unsupported OID: %v", id)
	}
	return d, nil
}

开发者ID:cuongdo，项目名称:cockroach，代码行数:101，代码来源:types.go

示例11: UnmarshalColumnValue

// UnmarshalColumnValue decodes the value from a key-value pair using the type
// expected by the column. An error is returned if the value's type does not
// match the column's type.
func UnmarshalColumnValue(
	a *DatumAlloc, kind ColumnType_Kind, value *roachpb.Value,
) (parser.Datum, error) {
	if value == nil {
		return parser.DNull, nil
	}

	switch kind {
	case ColumnType_BOOL:
		v, err := value.GetInt()
		if err != nil {
			return nil, err
		}
		return parser.MakeDBool(parser.DBool(v != 0)), nil
	case ColumnType_INT:
		v, err := value.GetInt()
		if err != nil {
			return nil, err
		}
		return a.NewDInt(parser.DInt(v)), nil
	case ColumnType_FLOAT:
		v, err := value.GetFloat()
		if err != nil {
			return nil, err
		}
		return a.NewDFloat(parser.DFloat(v)), nil
	case ColumnType_DECIMAL:
		v, err := value.GetDecimal()
		if err != nil {
			return nil, err
		}
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(v)
		return dd, nil
	case ColumnType_STRING:
		v, err := value.GetBytes()
		if err != nil {
			return nil, err
		}
		return a.NewDString(parser.DString(v)), nil
	case ColumnType_BYTES:
		v, err := value.GetBytes()
		if err != nil {
			return nil, err
		}
		return a.NewDBytes(parser.DBytes(v)), nil
	case ColumnType_DATE:
		v, err := value.GetInt()
		if err != nil {
			return nil, err
		}
		return a.NewDDate(parser.DDate(v)), nil
	case ColumnType_TIMESTAMP:
		v, err := value.GetTime()
		if err != nil {
			return nil, err
		}
		return a.NewDTimestamp(parser.DTimestamp{Time: v}), nil
	case ColumnType_TIMESTAMPTZ:
		v, err := value.GetTime()
		if err != nil {
			return nil, err
		}
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: v}), nil
	case ColumnType_INTERVAL:
		d, err := value.GetDuration()
		if err != nil {
			return nil, err
		}
		return a.NewDInterval(parser.DInterval{Duration: d}), nil
	default:
		return nil, util.Errorf("unsupported column type: %s", kind)
	}
}

开发者ID:GitGoldie，项目名称:cockroach，代码行数:77，代码来源:table.go

示例12: DecodeTableKey

// DecodeTableKey decodes a table key/value.
func DecodeTableKey(
	a *DatumAlloc, valType parser.Datum, key []byte, dir encoding.Direction,
) (parser.Datum, []byte, error) {
	if (dir != encoding.Ascending) && (dir != encoding.Descending) {
		return nil, nil, util.Errorf("invalid direction: %d", dir)
	}
	var isNull bool
	if key, isNull = encoding.DecodeIfNull(key); isNull {
		return parser.DNull, key, nil
	}
	var rkey []byte
	var err error
	switch valType.(type) {
	case *parser.DBool:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		// No need to chunk allocate DBool as MakeDBool returns either
		// parser.DBoolTrue or parser.DBoolFalse.
		return parser.MakeDBool(parser.DBool(i != 0)), rkey, err
	case *parser.DInt:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		return a.NewDInt(parser.DInt(i)), rkey, err
	case *parser.DFloat:
		var f float64
		if dir == encoding.Ascending {
			rkey, f, err = encoding.DecodeFloatAscending(key)
		} else {
			rkey, f, err = encoding.DecodeFloatDescending(key)
		}
		return a.NewDFloat(parser.DFloat(f)), rkey, err
	case *parser.DDecimal:
		var d *inf.Dec
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeDecimalAscending(key, nil)
		} else {
			rkey, d, err = encoding.DecodeDecimalDescending(key, nil)
		}
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(d)
		return dd, rkey, err
	case *parser.DString:
		var r string
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeUnsafeStringAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeUnsafeStringDescending(key, nil)
		}
		return a.NewDString(parser.DString(r)), rkey, err
	case *parser.DBytes:
		var r []byte
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeBytesAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeBytesDescending(key, nil)
		}
		return a.NewDBytes(parser.DBytes(r)), rkey, err
	case *parser.DDate:
		var t int64
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, t, err = encoding.DecodeVarintDescending(key)
		}
		return a.NewDDate(parser.DDate(t)), rkey, err
	case *parser.DTimestamp:
		var t time.Time
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeTimeAscending(key)
		} else {
			rkey, t, err = encoding.DecodeTimeDescending(key)
		}
		return a.NewDTimestamp(parser.DTimestamp{Time: t}), rkey, err
	case *parser.DTimestampTZ:
		var t time.Time
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeTimeAscending(key)
		} else {
			rkey, t, err = encoding.DecodeTimeDescending(key)
		}
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: t}), rkey, err
	case *parser.DInterval:
		var d duration.Duration
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeDurationAscending(key)
		} else {
			rkey, d, err = encoding.DecodeDurationDescending(key)
		}
		return a.NewDInterval(parser.DInterval{Duration: d}), rkey, err
	default:
		return nil, nil, util.Errorf("TODO(pmattis): decoded index key: %s", valType.Type())
//.........这里部分代码省略.........

开发者ID:GitGoldie，项目名称:cockroach，代码行数:101，代码来源:table.go

示例13: decodeTableKey

func decodeTableKey(valType parser.Datum, key []byte, dir encoding.Direction) (
	parser.Datum, []byte, error) {
	if (dir != encoding.Ascending) && (dir != encoding.Descending) {
		return nil, nil, util.Errorf("invalid direction: %d", dir)
	}
	var isNull bool
	if key, isNull = encoding.DecodeIfNull(key); isNull {
		return parser.DNull, key, nil
	}
	var rkey []byte
	var err error
	switch valType.(type) {
	case parser.DBool:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		return parser.DBool(i != 0), rkey, err
	case parser.DInt:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		return parser.DInt(i), rkey, err
	case parser.DFloat:
		var f float64
		if dir == encoding.Ascending {
			rkey, f, err = encoding.DecodeFloatAscending(key, nil)
		} else {
			rkey, f, err = encoding.DecodeFloatDescending(key, nil)
		}
		return parser.DFloat(f), rkey, err
	case *parser.DDecimal:
		var d *inf.Dec
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeDecimalAscending(key, nil)
		} else {
			rkey, d, err = encoding.DecodeDecimalDescending(key, nil)
		}
		dd := &parser.DDecimal{}
		dd.Set(d)
		return dd, rkey, err
	case parser.DString:
		var r string
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeStringAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeStringDescending(key, nil)
		}
		return parser.DString(r), rkey, err
	case parser.DBytes:
		var r []byte
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeBytesAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeBytesDescending(key, nil)
		}
		return parser.DBytes(r), rkey, err
	case parser.DDate:
		var t int64
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, t, err = encoding.DecodeVarintDescending(key)
		}
		return parser.DDate(t), rkey, err
	case parser.DTimestamp:
		var t time.Time
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeTimeAscending(key)
		} else {
			rkey, t, err = encoding.DecodeTimeDescending(key)
		}
		return parser.DTimestamp{Time: t}, rkey, err
	case parser.DInterval:
		var d int64
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, d, err = encoding.DecodeVarintDescending(key)
		}
		return parser.DInterval{Duration: time.Duration(d)}, rkey, err
	default:
		return nil, nil, util.Errorf("TODO(pmattis): decoded index key: %s", valType.Type())
	}
}

开发者ID:thebrandonstore，项目名称:cockroach，代码行数:90，代码来源:table.go

示例14: decodeOidDatum


//.........这里部分代码省略.........
				&alloc.pgNum.dscale,
			} {
				if err := binary.Read(r, binary.BigEndian, ptr); err != nil {
					return d, err
				}
			}

			decDigits := make([]byte, 0, alloc.pgNum.ndigits*pgDecDigits)
			for i := int16(0); i < alloc.pgNum.ndigits-1; i++ {
				if err := binary.Read(r, binary.BigEndian, &alloc.i16); err != nil {
					return d, err
				}
				decDigits = strconv.AppendUint(decDigits, uint64(alloc.i16), 10)
			}

			// The last digit may contain padding, which we need to deal with.
			if err := binary.Read(r, binary.BigEndian, &alloc.i16); err != nil {
				return d, err
			}
			dscale := (alloc.pgNum.ndigits - 1 - alloc.pgNum.weight) * pgDecDigits
			if overScale := dscale - alloc.pgNum.dscale; overScale > 0 {
				dscale -= overScale
				for i := int16(0); i < overScale; i++ {
					alloc.i16 /= 10
				}
			}
			decDigits = strconv.AppendUint(decDigits, uint64(alloc.i16), 10)
			alloc.dd.UnscaledBig().SetString(string(decDigits), 10)
			alloc.dd.SetScale(inf.Scale(dscale))

			switch alloc.pgNum.sign {
			case pgNumericPos:
			case pgNumericNeg:
				alloc.dd.Neg(&alloc.dd.Dec)
			default:
				return d, util.Errorf("unsupported numeric sign: %s", alloc.pgNum.sign)
			}

			d = &alloc.dd
		default:
			return d, util.Errorf("unsupported numeric format code: %s", code)
		}
	case oid.T_text, oid.T_varchar:
		switch code {
		case formatText, formatBinary:
			d = parser.NewDString(string(b))
		default:
			return d, util.Errorf("unsupported text format code: %s", code)
		}
	case oid.T_bytea:
		switch code {
		case formatText:
			// http://www.postgresql.org/docs/current/static/datatype-binary.html#AEN5667
			// Code cribbed from github.com/lib/pq.

			// We only support hex encoding.
			if len(b) >= 2 && bytes.Equal(b[:2], []byte("\\x")) {
				b = b[2:] // trim off leading "\\x"
				result := make([]byte, hex.DecodedLen(len(b)))
				_, err := hex.Decode(result, b)
				if err != nil {
					return d, err
				}
				d = parser.NewDBytes(parser.DBytes(result))
			} else {
				return d, util.Errorf("unsupported bytea encoding: %q", b)
			}
		case formatBinary:
			d = parser.NewDBytes(parser.DBytes(b))
		default:
			return d, util.Errorf("unsupported bytea format code: %s", code)
		}
	case oid.T_timestamp, oid.T_timestamptz:
		switch code {
		case formatText:
			ts, err := parseTs(string(b))
			if err != nil {
				return d, util.Errorf("could not parse string %q as timestamp", b)
			}
			d = parser.MakeDTimestamp(ts, time.Microsecond)
		default:
			return d, util.Errorf("unsupported timestamp format code: %s", code)
		}
	case oid.T_date:
		switch code {
		case formatText:
			ts, err := parseTs(string(b))
			if err != nil {
				return d, util.Errorf("could not parse string %q as date", b)
			}
			daysSinceEpoch := ts.Unix() / secondsInDay
			d = parser.NewDDate(parser.DDate(daysSinceEpoch))
		default:
			return d, util.Errorf("unsupported date format code: %s", code)
		}
	default:
		return d, util.Errorf("unsupported OID: %v", id)
	}
	return d, nil
}

开发者ID:JKhawaja，项目名称:cockroach，代码行数:101，代码来源:types.go

注：本文中的github.com/cockroachdb/cockroach/sql/parser.DDate函数示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。