类: BTreeIndex<TKey>

定义于: packages/db/src/indexes/btree-index.ts:28

B+Tree 索引，用于排序数据和范围查询。此索引可维护排序项并提供高效的范围操作。

继承自

BaseIndex<TKey>

类型参数

• TKey extends string | number = string | number

构造函数

new BTreeIndex()

new BTreeIndex<TKey>(
   id, 
   expression, 
   name?, 
options?): BTreeIndex<TKey>

new BTreeIndex<TKey>(
   id, 
   expression, 
   name?, 
options?): BTreeIndex<TKey>

定义于: packages/db/src/indexes/btree-index.ts:48

参数

id

number

expression

BasicExpression

name?

string

options?

any

Returns (返回)

BTreeIndex<TKey>

Overrides

BaseIndex.constructor

属性

expression

readonly expression: BasicExpression;

readonly expression: BasicExpression;

定义于: packages/db/src/indexes/base-index.ts:33

继承自

BaseIndex.expression

id

readonly id: number;

readonly id: number;

定义于: packages/db/src/indexes/base-index.ts:31

继承自

BaseIndex.id

lastUpdated

protected lastUpdated: Date;

protected lastUpdated: Date;

定义于: packages/db/src/indexes/base-index.ts:38

继承自

BaseIndex.lastUpdated

lookupCount

protected lookupCount: number = 0;

protected lookupCount: number = 0;

定义于: packages/db/src/indexes/base-index.ts:36

继承自

BaseIndex.lookupCount

name?

readonly optional name: string;

readonly optional name: string;

定义于: packages/db/src/indexes/base-index.ts:32

继承自

BaseIndex.name

支持的操作

readonly supportedOperations: Set<"eq" | "gt" | "gte" | "lt" | "lte" | "in" | "like" | "ilike">;

readonly supportedOperations: Set<"eq" | "gt" | "gte" | "lt" | "lte" | "in" | "like" | "ilike">;

定义于: packages/db/src/indexes/btree-index.ts:31

Overrides

BaseIndex.supportedOperations

总查找时间

protected totalLookupTime: number = 0;

protected totalLookupTime: number = 0;

定义于: packages/db/src/indexes/base-index.ts:37

继承自

BaseIndex.totalLookupTime

访问器

indexedKeysSet

Get Signature

get indexedKeysSet(): Set<TKey>

get indexedKeysSet(): Set<TKey>

定义于: packages/db/src/indexes/btree-index.ts:250

Returns (返回)

Set<TKey>

keyCount

Get Signature

get keyCount(): number

get keyCount(): number

定义于: packages/db/src/indexes/btree-index.ts:188

获取索引键的数量

Returns (返回)

number

Overrides

BaseIndex.keyCount

orderedEntriesArray

Get Signature

get orderedEntriesArray(): [any, Set<TKey>][]

get orderedEntriesArray(): [any, Set<TKey>][]

定义于: packages/db/src/indexes/btree-index.ts:254

Returns (返回)

[any, Set<TKey>][]

valueMapData

Get Signature

get valueMapData(): Map<any, Set<TKey>>

get valueMapData(): Map<any, Set<TKey>>

定义于: packages/db/src/indexes/btree-index.ts:260

Returns (返回)

Map<any, Set<TKey>>

方法

add()

add(key, item): void

add(key, item): void

定义于: packages/db/src/indexes/btree-index.ts:64

将值添加到索引

参数

key

TKey

item

any

Returns (返回)

void

Overrides

BaseIndex.add

build()

build(entries): void

build(entries): void

定义于: packages/db/src/indexes/btree-index.ts:132

从条目集合构建索引

参数

entries

Iterable<[TKey, any]>

Returns (返回)

void

Overrides

BaseIndex.build

clear()

clear(): void

clear(): void

定义于: packages/db/src/indexes/btree-index.ts:143

清除索引中的所有数据

Returns (返回)

void

Overrides

BaseIndex.clear

equalityLookup()

equalityLookup(value): Set<TKey>

equalityLookup(value): Set<TKey>

定义于: packages/db/src/indexes/btree-index.ts:197

执行相等性查找

参数

value

any

Returns (返回)

Set<TKey>

evaluateIndexExpression()

protected evaluateIndexExpression(item): any

protected evaluateIndexExpression(item): any

定义于: packages/db/src/indexes/base-index.ts:87

参数

item

any

Returns (返回)

any

继承自

BaseIndex.evaluateIndexExpression

getStats()

getStats(): IndexStats

getStats(): IndexStats

定义于: packages/db/src/indexes/base-index.ts:74

Returns (返回)

IndexStats

继承自

BaseIndex.getStats

inArrayLookup()

inArrayLookup(values): Set<TKey>

inArrayLookup(values): Set<TKey>

定义于: packages/db/src/indexes/btree-index.ts:236

执行 IN 数组查找

参数

values

any[]

Returns (返回)

Set<TKey>

initialize()

protected initialize(_options?): void

protected initialize(_options?): void

定义于: packages/db/src/indexes/btree-index.ts:59

参数

_options?

BTreeIndexOptions

Returns (返回)

void

Overrides

BaseIndex.initialize

lookup()

lookup(operation, value): Set<TKey>

lookup(operation, value): Set<TKey>

定义于: packages/db/src/indexes/btree-index.ts:153

执行查找操作

参数

operation

"eq" | "gt" | "gte" | "lt" | "lte" | "in" | "like" | "ilike"

value

any

Returns (返回)

Set<TKey>

Overrides

BaseIndex.lookup

matchesField()

matchesField(fieldPath): boolean

matchesField(fieldPath): boolean

定义于: packages/db/src/indexes/base-index.ts:66

参数

fieldPath

string[]

Returns (返回)

boolean

继承自

BaseIndex.matchesField

rangeQuery()

rangeQuery(options): Set<TKey>

rangeQuery(options): Set<TKey>

定义于: packages/db/src/indexes/btree-index.ts:205

执行带有选项的范围查询。对于复合查询（如“WHERE a > 5 AND a < 10”）效率更高。

参数

options

RangeQueryOptions = {}

Returns (返回)

Set<TKey>

remove()

remove(key, item): void

remove(key, item): void

定义于: packages/db/src/indexes/btree-index.ts:92

从索引中删除一个值

参数

key

TKey

item

any

Returns (返回)

void

Overrides

BaseIndex.remove

supports()

supports(operation): boolean

supports(operation): boolean

定义于: packages/db/src/indexes/base-index.ts:62

参数

operation

"eq" | "gt" | "gte" | "lt" | "lte" | "in" | "like" | "ilike"

Returns (返回)

boolean

继承自

BaseIndex.supports

trackLookup()

protected trackLookup(startTime): void

protected trackLookup(startTime): void

定义于: packages/db/src/indexes/base-index.ts:92

参数

startTime

number

Returns (返回)

void

继承自

BaseIndex.trackLookup

update()

update(
   key, 
   oldItem, 
   newItem): void

update(
   key, 
   oldItem, 
   newItem): void

定义于: packages/db/src/indexes/btree-index.ts:124

更新索引中的值

参数

key

TKey

oldItem

any

newItem

any

Returns (返回)

void

Overrides

BaseIndex.update

updateTimestamp()

protected updateTimestamp(): void

protected updateTimestamp(): void

定义于: packages/db/src/indexes/base-index.ts:98

Returns (返回)

void

继承自

BaseIndex.updateTimestamp