Golang mysqldef.ParseDuration函数代码示例

func (s *testTypeConvertSuite) TestConvertToString(c *C) {
	testToString(c, "0", "0")
	testToString(c, true, "1")
	testToString(c, "false", "false")
	testToString(c, int(0), "0")
	testToString(c, int8(0), "0")
	testToString(c, int16(0), "0")
	testToString(c, int32(0), "0")
	testToString(c, int64(0), "0")
	testToString(c, uint(0), "0")
	testToString(c, uint8(0), "0")
	testToString(c, uint16(0), "0")
	testToString(c, uint32(0), "0")
	testToString(c, uint64(0), "0")
	testToString(c, float32(1.6), "1.6")
	testToString(c, float64(-0.6), "-0.6")
	testToString(c, []byte{1}, "\x01")

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToString(c, t, "2011-11-10 11:11:11.999999")

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToString(c, td, "11:11:11.999999")

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToString(c, v, "3.14159")

	_, err = ToString(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testTypeConvertSuite) TestConvertToString(c *C) {
	testToString(c, "0", "0")
	testToString(c, true, "1")
	testToString(c, "false", "false")
	testToString(c, int(0), "0")
	testToString(c, int64(0), "0")
	testToString(c, uint64(0), "0")
	testToString(c, float32(1.6), "1.6")
	testToString(c, float64(-0.6), "-0.6")
	testToString(c, []byte{1}, "\x01")
	testToString(c, mysql.Hex{Value: 0x4D7953514C}, "MySQL")
	testToString(c, mysql.Bit{Value: 0x41, Width: 8}, "A")
	testToString(c, mysql.Enum{Name: "a", Value: 1}, "a")
	testToString(c, mysql.Set{Name: "a", Value: 1}, "a")

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToString(c, t, "2011-11-10 11:11:11.999999")

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToString(c, td, "11:11:11.999999")

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToString(c, v, "3.14159")

	_, err = ToString(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testTypeConvertSuite) TestConvertToFloat64(c *C) {
	testToFloat64(c, "0", float64(0))
	testToFloat64(c, false, float64(0))
	testToFloat64(c, true, float64(1))
	testToFloat64(c, int(0), float64(0))
	testToFloat64(c, int8(0), float64(0))
	testToFloat64(c, int16(0), float64(0))
	testToFloat64(c, int32(0), float64(0))
	testToFloat64(c, int64(0), float64(0))
	testToFloat64(c, uint(0), float64(0))
	testToFloat64(c, uint8(0), float64(0))
	testToFloat64(c, uint16(0), float64(0))
	testToFloat64(c, uint32(0), float64(0))
	testToFloat64(c, uint64(0), float64(0))
	// TODO: check this
	//testToFloat64(c, float32(3.1), float64(3.1))
	testToFloat64(c, float64(3.1), float64(3.1))

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToFloat64(c, t, float64(20111110111111.999999))

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToFloat64(c, td, float64(111111.999999))

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToFloat64(c, v, float64(3.14159))

	_, err = ToFloat64(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testTypeConvertSuite) TestConvertToBool(c *C) {
	testToBool(c, int(0), 0)
	testToBool(c, int64(0), 0)
	testToBool(c, uint64(0), 0)
	testToBool(c, float32(0), 0)
	testToBool(c, float64(0), 0)
	testToBool(c, "", 0)
	testToBool(c, "0", 0)
	testToBool(c, []byte{}, 0)
	testToBool(c, []byte("0"), 0)
	testToBool(c, mysql.Hex{Value: 0}, 0)
	testToBool(c, mysql.Bit{Value: 0, Width: 8}, 0)
	testToBool(c, mysql.Enum{Name: "a", Value: 1}, 1)
	testToBool(c, mysql.Set{Name: "a", Value: 1}, 1)

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToBool(c, t, 1)

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToBool(c, td, 1)

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToBool(c, v, 1)

	_, err = ToBool(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testTypeConvertSuite) TestConvertToFloat64(c *C) {
	testToFloat64(c, "0", float64(0))
	testToFloat64(c, int(0), float64(0))
	testToFloat64(c, int64(0), float64(0))
	testToFloat64(c, uint64(0), float64(0))
	// TODO: check this
	//testToFloat64(c, float32(3.1), float64(3.1))
	testToFloat64(c, float64(3.1), float64(3.1))
	testToFloat64(c, mysql.Hex{Value: 100}, float64(100))
	testToFloat64(c, mysql.Bit{Value: 100, Width: 8}, float64(100))
	testToFloat64(c, mysql.Enum{Name: "a", Value: 1}, float64(1))
	testToFloat64(c, mysql.Set{Name: "a", Value: 1}, float64(1))

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToFloat64(c, t, float64(20111110111111.999999))

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToFloat64(c, td, float64(111111.999999))

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToFloat64(c, v, float64(3.14159))

	_, err = ToFloat64(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testTypeConvertSuite) TestConvertToInt64(c *C) {
	testToInt64(c, "0", int64(0))
	testToInt64(c, int(0), int64(0))
	testToInt64(c, int64(0), int64(0))
	testToInt64(c, uint64(0), int64(0))
	testToInt64(c, float32(3.1), int64(3))
	testToInt64(c, float64(3.1), int64(3))
	testToInt64(c, mysql.Hex{Value: 100}, int64(100))
	testToInt64(c, mysql.Bit{Value: 100, Width: 8}, int64(100))

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 0)
	c.Assert(err, IsNil)
	testToInt64(c, t, int64(20111110111112))

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToInt64(c, td, int64(111112))

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToInt64(c, v, int64(3))

	_, err = ToInt64(&invalidMockType{})
	c.Assert(err, NotNil)
}

func (s *testUtilSuite) TestDumpBinaryTime(c *C) {
	t, err := mysql.ParseTimestamp("0000-00-00 00:00:00.0000000")
	c.Assert(err, IsNil)
	d := dumpBinaryDateTime(t, nil)
	c.Assert(d, DeepEquals, []byte{11, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0})
	t, err = mysql.ParseDatetime("0000-00-00 00:00:00.0000000")
	c.Assert(err, IsNil)
	d = dumpBinaryDateTime(t, nil)
	c.Assert(d, DeepEquals, []byte{11, 1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0})

	t, err = mysql.ParseDate("0000-00-00")
	c.Assert(err, IsNil)
	d = dumpBinaryDateTime(t, nil)
	c.Assert(d, DeepEquals, []byte{4, 1, 0, 1, 1})

	myDuration, err := mysql.ParseDuration("0000-00-00 00:00:00.0000000", 6)
	c.Assert(err, IsNil)
	d = dumpBinaryTime(myDuration.Duration)
	c.Assert(d, DeepEquals, []byte{0})
}

func (s *testTypeConvertSuite) TestConvertToBool(c *C) {
	testToBool(c, false, int8(0))
	testToBool(c, int(0), int8(0))
	testToBool(c, int8(0), int8(0))
	testToBool(c, int16(0), int8(0))
	testToBool(c, int32(0), int8(0))
	testToBool(c, int64(0), int8(0))
	testToBool(c, uint(0), int8(0))
	testToBool(c, uint8(0), int8(0))
	testToBool(c, uint16(0), int8(0))
	testToBool(c, uint32(0), int8(0))
	testToBool(c, uint64(0), int8(0))
	testToBool(c, float32(0), int8(0))
	testToBool(c, float64(0), int8(0))
	testToBool(c, "", int8(0))
	testToBool(c, "0", int8(0))
	testToBool(c, []byte{}, int8(0))
	testToBool(c, []byte("0"), int8(0))

	t, err := mysql.ParseTime("2011-11-10 11:11:11.999999", mysql.TypeTimestamp, 6)
	c.Assert(err, IsNil)
	testToBool(c, t, int8(1))

	td, err := mysql.ParseDuration("11:11:11.999999", 6)
	c.Assert(err, IsNil)
	testToBool(c, td, int8(1))

	ft := NewFieldType(mysql.TypeNewDecimal)
	ft.Decimal = 5
	v, err := Convert(3.1415926, ft)
	c.Assert(err, IsNil)
	testToBool(c, v, int8(1))

	_, err = ToBool(&invalidMockType{})
	c.Assert(err, NotNil)
}

// 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.TypeString:
		x, err := ToString(val)
		if err != nil {
			return InvConv(val, tp)
		}
		// TODO: consider target.Charset/Collate
		x = truncateStr(x, target.Flen)
		return x, nil
	case mysql.TypeBlob:
		x, err := ToString(val)
		if err != nil {
			return InvConv(val, tp)
		}
		x = truncateStr(x, target.Flen)
		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)
		default:
			return InvConv(val, tp)
		}
	case mysql.TypeLonglong:
		x, err := ToInt64(val)
		if err != nil {
			return InvConv(val, tp)
		}
		return x, nil
	case mysql.TypeNewDecimal:
		x, err := ToDecimal(val)
		if err != nil {
			return InvConv(val, tp)
		}
//.........这里部分代码省略.........

// 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.........

// 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")
	}
}

func parseDuration(c *C, s string) mysql.Duration {
	m, err := mysql.ParseDuration(s, mysql.DefaultFsp)
	c.Assert(err, IsNil)
	return m
}

// 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.TypeString:
		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.TypeBlob:
		x, err := ToString(val)
		if err != nil {
			return InvConv(val, tp)
		}
		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)
		default:
			return InvConv(val, tp)
		}
	case mysql.TypeLonglong:
		x, err := ToInt64(val)
		if err != nil {
			return InvConv(val, tp)
		}
//.........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.........

// 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.........