types

package

v0.0.1 Latest Latest Go to latest Published: Jun 28, 2022 License: MIT Imports: 6 Imported by: 0

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Valid go.mod file
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Repository

github.com/ryogrid/SamehadaDB

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Documentation ¶

Index ¶

Constants
type LSN
- func NewLSNFromBytes(data []byte) (ret LSN)
- func (lsn LSN) AtomicAdd(val int32)
- func (lsn LSN) Serialize() []byte
type PageID
- func NewPageIDFromBytes(data []byte) (ret PageID)
- func (id PageID) IsValid() bool
- func (id PageID) Serialize() []byte
type TxnID
- func NewTxnIDFromBytes(data []byte) (ret TxnID)
- func (id *TxnID) AtomicAdd(val int32)
- func (id TxnID) Serialize() []byte
type TypeID
- func (t TypeID) Size() uint32
type UInt32
- func NewUInt32FromBytes(data []byte) (ret UInt32)
- func (id UInt32) Serialize() []byte
type Value

Constants ¶

View Source

const InvalidPageID = PageID(-1)

InvalidPageID represents an invalid page ID

View Source

const SizeOfLSN = 4

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type LSN ¶

type LSN int32

LSN is the type of the log identifier

func NewLSNFromBytes ¶

func NewLSNFromBytes(data []byte) (ret LSN)

NewLSNFromBytes creates a LSN from []byte

func (LSN) AtomicAdd ¶

func (lsn LSN) AtomicAdd(val int32)

func (LSN) Serialize ¶

func (lsn LSN) Serialize() []byte

Serialize casts it to []byte

type PageID ¶

type PageID int32

PageID is the type of the page identifier

func NewPageIDFromBytes ¶

func NewPageIDFromBytes(data []byte) (ret PageID)

NewPageIDFromBytes creates a page id from []byte

func (PageID) IsValid ¶

func (id PageID) IsValid() bool

IsValid checks if id is valid

func (PageID) Serialize ¶

func (id PageID) Serialize() []byte

Serialize casts it to []byte

type TxnID ¶

type TxnID int32

TxnID is the type of the transaction identifier

func NewTxnIDFromBytes ¶

func NewTxnIDFromBytes(data []byte) (ret TxnID)

NewPageIDFromBytes creates a page id from []byte

func (*TxnID) AtomicAdd ¶

func (id *TxnID) AtomicAdd(val int32)

func (TxnID) Serialize ¶

func (id TxnID) Serialize() []byte

Serialize casts it to []byte

type TypeID ¶

type TypeID int

const (
	Invalid TypeID = iota
	Boolean
	Tinyint
	Smallint
	Integer
	BigInt
	Decimal
	Float
	Varchar
	Timestamp
	Null
)

Every possible SQL type ID

func (TypeID) Size ¶

func (t TypeID) Size() uint32

type UInt32 ¶

type UInt32 uint32

func NewUInt32FromBytes ¶

func NewUInt32FromBytes(data []byte) (ret UInt32)

NewUInt32FromBytes creates a page id from []byte

func (UInt32) Serialize ¶

func (id UInt32) Serialize() []byte

Serialize casts it to []byte

type Value ¶

type Value struct {
	// contains filtered or unexported fields
}

A value is an class that represents a view over SQL data stored in some materialized state. All values have a type and comparison functions, and implement other type-specific functionality.

func NewBoolean ¶

func NewBoolean(value bool) Value

func NewFloat ¶

func NewFloat(value float32) Value

func NewInteger ¶

func NewInteger(value int32) Value

func NewNull ¶

func NewNull() Value

it can be used only when you can not know value type to be compared or something

func NewValueFromBytes ¶

func NewValueFromBytes(data []byte, valueType TypeID) (ret *Value)

NewValueFromBytes is used for deserialization

func NewVarchar ¶

func NewVarchar(value string) Value

func (Value) Add ¶

func (v Value) Add(other *Value) *Value

func (Value) CompareEquals ¶

func (v Value) CompareEquals(right Value) bool

func (Value) CompareGreaterThan ¶

func (v Value) CompareGreaterThan(right Value) bool

func (Value) CompareGreaterThanOrEqual ¶

func (v Value) CompareGreaterThanOrEqual(right Value) bool

func (Value) CompareLessThan ¶

func (v Value) CompareLessThan(right Value) bool

func (Value) CompareLessThanOrEqual ¶

func (v Value) CompareLessThanOrEqual(right Value) bool

func (Value) CompareNotEquals ¶

func (v Value) CompareNotEquals(right Value) bool

func (Value) IsNull ¶

func (v Value) IsNull() bool

func (Value) Max ¶

func (v Value) Max(other *Value) *Value

func (Value) Min ¶

func (v Value) Min(other *Value) *Value

func (Value) Serialize ¶

func (v Value) Serialize() []byte

func (Value) SetNull ¶

func (v Value) SetNull() *Value

note: (need to be) only way to get Value object which has NULL value

a value filed correspoding to value type is initialized to default value

func (Value) Size ¶

func (v Value) Size() uint32

Size returns the size in bytes that the type will occupy inside the tuple

func (Value) ToBoolean ¶

func (v Value) ToBoolean() bool

if you use this to get column value NULL value check is needed in general

func (Value) ToFloat ¶

func (v Value) ToFloat() float32

if you use this to get column value NULL value check is needed in general

func (Value) ToInteger ¶

func (v Value) ToInteger() int32

if you use this to get column value NULL value check is needed in general

func (Value) ToString ¶

func (v Value) ToString() string

func (Value) ToVarchar ¶

func (v Value) ToVarchar() string

if you use this to get column value NULL value check is needed in general

func (Value) ValueType ¶

func (v Value) ValueType() TypeID

Source Files ¶

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