国产无码综合区,色欲AV无码国产永久播放,无码天堂亚洲国产AV,国产日韩欧美女同一区二区

<style id="pvfqu"></style>

neo4j查詢語(yǔ)言Cypher詳解(三)--函數(shù)

2年前作者：demon7552003分類(lèi)：Toy博客閱讀(22)違法舉報(bào)

這篇具有很好參考價(jià)值的文章主要介紹了neo4j查詢語(yǔ)言Cypher詳解(三)--函數(shù)。希望對(duì)大家有所幫助。如果存在錯(cuò)誤或未考慮完全的地方，請(qǐng)大家不吝賜教，您也可以點(diǎn)擊"舉報(bào)違法"按鈕提交疑問(wèn)。

函數(shù)

Cypher中的函數(shù)如果輸入?yún)?shù)為null，則返回null。

以字符串作為輸入的函數(shù)都對(duì)Unicode字符進(jìn)行操作，而不是對(duì)標(biāo)準(zhǔn)字符進(jìn)行操作。例如，size()函數(shù)應(yīng)用于任何Unicode字符將返回1，即使該字符不適合一個(gè)字符的16位。

可以通過(guò) SHOW FUNCTIONS 查看函數(shù)定義。

函數(shù)簽名中參數(shù)格式：eg：

all(
    variable :: VARIABLE 		//:: VARIABLE，說(shuō)明是個(gè)變量，可用于后面的 WHERE 部分
	IN 
list :: LIST OF ANY? 			//list，是個(gè)LIST泛型。
WHERE predicate :: ANY?			// predicate，是任意的斷言
) 
:: (BOOLEAN?)					//函數(shù)返回值類(lèi)型為BOOLEAN

斷言函數(shù)

Function	Signature	Description
`all()`	`all(variable :: VARIABLE IN list :: LIST OF ANY? WHERE predicate :: ANY?) :: (BOOLEAN?)`	Returns true if the predicate holds for all elements in the given list.
`any()`	`any(variable :: VARIABLE IN list :: LIST OF ANY? WHERE predicate :: ANY?) :: (BOOLEAN?)`	Returns true if the predicate holds for at least one element in the given list.
`exists()`	`exists(input :: ANY?) :: (BOOLEAN?)`	Returns `true` if a match for the pattern exists in the graph.
`isEmpty()`	`isEmpty(input :: LIST? OF ANY?) :: (BOOLEAN?)`	Checks whether a list is empty.
`isEmpty()`	`isEmpty(input :: MAP?) :: (BOOLEAN?)`	Checks whether a map is empty.
`isEmpty()`	`isEmpty(input :: STRING?) :: (BOOLEAN?)`	Checks whether a string is empty.
`none()`	`none(variable :: VARIABLE IN list :: LIST OF ANY? WHERE predicate :: ANY?) :: (BOOLEAN?)`	Returns true if the predicate holds for no element in the given list.
`single()`	`single(variable :: VARIABLE IN list :: LIST OF ANY? WHERE predicate :: ANY?) :: (BOOLEAN?)`	Returns true if the predicate holds for exactly one of the elements in the given list.

標(biāo)量函數(shù)

Function	Signature	Description
`coalesce()`	`coalesce(input :: ANY?) :: (ANY?)`	返回第一個(gè)非null值。
`endNode()`	`endNode(input :: RELATIONSHIP?) :: (NODE?)`	Returns the end node of a relationship.
`head()`	`head(list :: LIST? OF ANY?) :: (ANY?)`	Returns the first element in a list.
`id()`	`id(input :: NODE?) :: (INTEGER?)`	Deprecated Returns the id of a node. Replaced by `elementId()`
	`id(input :: RELATIONSHIP?) :: (INTEGER?)`	Deprecated Returns the id of a relationship. Replaced by `elementId()`.
`last()`	`last(list :: LIST? OF ANY?) :: (ANY?)`
`length()`	`length(input :: PATH?) :: (INTEGER?)`	Returns the length of a path.
`properties()`	`properties(input :: MAP?) :: (MAP?)`	返回一個(gè)對(duì)象的所有屬性，作為一個(gè)map
	`properties(input :: NODE?) :: (MAP?)`	返回一個(gè)節(jié)點(diǎn)的所有屬性，作為一個(gè)map
	`properties(input :: RELATIONSHIP?) :: (MAP?)`	返回一個(gè)關(guān)系的所有屬性，作為一個(gè)map
`randomUUID()`	`randomUUID() :: (STRING?)`
`size()`	`size(input :: LIST? OF ANY?) :: (INTEGER?)`	Returns the number of items in a list.
	`size(input :: STRING?) :: (INTEGER?)`	Returns the number of Unicode characters in a string.
`startNode()`	`startNode(input :: RELATIONSHIP?) :: (NODE?)`
`toBoolean()`	`toBoolean(input :: STRING?) :: (BOOLEAN?)`
	`toBoolean(input :: BOOLEAN?) :: (BOOLEAN?)`
	`toBoolean(input :: INTEGER?) :: (BOOLEAN?)`
`toBooleanOrNull()`	`toBooleanOrNull(input :: ANY?) :: (BOOLEAN?)`	轉(zhuǎn)換為boolean，不能轉(zhuǎn)換返回null。
`toFloat()`	`toFloat(input :: NUMBER?) :: (FLOAT?)`
	`toFloat(input :: STRING?) :: (FLOAT?)`
`toFloatOrNull()`	`toFloatOrNull(input :: ANY?) :: (FLOAT?)`	轉(zhuǎn)換為小數(shù)，不能轉(zhuǎn)換返回null。
`toInteger()`	`toInteger(input :: NUMBER?) :: (INTEGER?)`
	`toInteger(input :: BOOLEAN?) :: (INTEGER?)`
	`toInteger(input :: STRING?) :: (INTEGER?)`
`toIntegerOrNull()`	`toIntegerOrNull(input :: ANY?) :: (INTEGER?)`	轉(zhuǎn)換為整形，不能轉(zhuǎn)換返回null。
`type()`	`type(input :: RELATIONSHIP?) :: (STRING?)`	Returns the string representation of the relationship type.

示例

CREATE (p:Person {name: 'Stefan', city: 'Berlin'})
RETURN properties(p)
//OUT PUT:
//: {"city":"Berlin","name":"Stefan"}

聚合函數(shù)

Function	Signature	Description
`avg()`	`avg(input :: DURATION?) :: (DURATION?)`
	`avg(input :: FLOAT?) :: (FLOAT?)`
	`avg(input :: INTEGER?) :: (INTEGER?)`
`collect()`	`collect(input :: ANY?) :: (LIST? OF ANY?)`	收集數(shù)據(jù)作為一個(gè)LIST。
`count()`	`count(input :: ANY?) :: (INTEGER?)`
`max()`	`max(input :: ANY?) :: (ANY?)`
`min()`	`min(input :: ANY?) :: (ANY?)`
`percentileCont()`	`percentileCont(input :: FLOAT?, percentile :: FLOAT?) :: (FLOAT?)`
`percentileDisc()`	`percentileDisc(input :: FLOAT?, percentile :: FLOAT?) :: (FLOAT?)`
	`percentileDisc(input :: INTEGER?, percentile :: FLOAT?) :: (INTEGER?)
`stdev()`	`stdev(input :: FLOAT?) :: (FLOAT?)`
`stdevp()`	`stdevp(input :: FLOAT?) :: (FLOAT?)`
`sum()`	`sum(input :: DURATION?) :: (DURATION?)`
	`sum(input :: FLOAT?) :: (FLOAT?)
	`sum(input :: INTEGER?) :: (INTEGER?)

集合函數(shù)

Function	Signature	Description
`keys()`	`keys(input :: MAP?) :: (LIST? OF STRING?)`	返回MAP的所有KEY LIST
	`keys(input :: NODE?) :: (LIST? OF STRING?)`	返回節(jié)點(diǎn)的所有屬性 LIST
	`keys(input :: RELATIONSHIP?) :: (LIST? OF STRING?)`	返回關(guān)系的所有屬性 LIST
`labels()`	`labels(input :: NODE?) :: (LIST? OF STRING?)`	Returns a list containing the string representations for all the labels of a node.
`nodes()`	`nodes(input :: PATH?) :: (LIST? OF NODE?)`	Returns a list containing all the nodes in a path.
`range()`	`range(start :: INTEGER?, end :: INTEGER?) :: (LIST? OF INTEGER?)`	Returns a list comprising all integer values within a specified range.
	`range(start :: INTEGER?, end :: INTEGER?, step :: INTEGER?) :: (LIST? OF INTEGER?)`	Returns a list comprising all integer values within a specified range created with step length.
`reduce()`	`reduce(accumulator :: VARIABLE = initial :: ANY?, variable :: VARIABLE IN list :: LIST OF ANY?	expression :: ANY) :: (ANY?)`
`relationships()`	`relationships(input :: PATH?) :: (LIST? OF RELATIONSHIP?)`	Returns a list containing all the relationships in a path.
`reverse()`	`reverse(input :: LIST? OF ANY?) :: (LIST? OF ANY?)`	Returns a list in which the order of all elements in the original list have been reversed.
`tail()`	`tail(input :: LIST? OF ANY?) :: (LIST? OF ANY?)`	Returns all but the first element in a list.
`toBooleanList()`	`toBooleanList(input :: LIST? OF ANY?) :: (LIST? OF BOOLEAN?)`
`toFloatList()`	`toFloatList(input :: LIST? OF ANY?) :: (LIST? OF FLOAT?)`
`toIntegerList()`	`toIntegerList(input :: LIST? OF ANY?) :: (LIST? OF INTEGER?)`
`toStringList()`	`toStringList(input :: LIST? OF ANY?) :: (LIST? OF STRING?)`

示例

toBooleanList()：

RETURN toBooleanList(null) as noList,
toBooleanList([null, null]) as nullsInList,
toBooleanList(['a string', true, 'false', null, ['A','B']]) as mixedList

noList	nullsInList	mixedList
`<null>`	`[<null>,<null>]`	`[<null>,true,false,<null>,<null>]`

總結(jié)：

參數(shù)不是個(gè)LIST，報(bào)錯(cuò)
LIST 中的null，不轉(zhuǎn)換，保留
LIST中的不可轉(zhuǎn)換元素，結(jié)果為null。
BOOLEAN類(lèi)型的元素，保留原始值

toFloatList，toIntegerList，toStringList 與 toBooleanList 規(guī)則類(lèi)似。

數(shù)值函數(shù)

Function	Signature	Description
`abs()`	`abs(input :: FLOAT?) :: (FLOAT?)`
	`abs(input :: INTEGER?) :: (INTEGER?)`
`ceil()`	`ceil(input :: FLOAT?) :: (FLOAT?)`
`floor()`	`floor(input :: FLOAT?) :: (FLOAT?)`
`isNaN()`	`isNaN(input :: FLOAT?) :: (BOOLEAN?)`	Returns `true` if the floating point number is `NaN`.
	`isNaN(input :: INTEGER?) :: (BOOLEAN?)`
`rand()`	`rand() :: (FLOAT?)`
`round()`	`round(input :: FLOAT?) :: (FLOAT?)`
	`round(value :: FLOAT?, precision :: NUMBER?) :: (FLOAT?)`
	`round(value :: FLOAT?, precision :: NUMBER?, mode :: STRING?) :: (FLOAT?)`
`sign()`	`sign(input :: FLOAT?) :: (INTEGER?)`
	`sign(input :: INTEGER?) :: (INTEGER?)`

對(duì)數(shù)函數(shù)

Function	Signature	Description
`e()`	`e() :: (FLOAT?)`	返回e。
`exp()`	`exp(input :: FLOAT?) :: (FLOAT?)`	返回e^n。
`log()`	`log(input :: FLOAT?) :: (FLOAT?)`	返回自然對(duì)數(shù)，以e為底
`log10()`	`log10(input :: FLOAT?) :: (FLOAT?)`	返回以10位底的對(duì)數(shù)
`sqrt()`	`sqrt(input :: FLOAT?) :: (FLOAT?)`	平方差

三角函數(shù)

Function	Signature	Description
`acos()`	`acos(input :: FLOAT?) :: (FLOAT?)`
`asin()`	`asin(input :: FLOAT?) :: (FLOAT?)
`atan()`	`atan(input :: FLOAT?) :: (FLOAT?)`
`atan2()`	`atan2(y :: FLOAT?, x :: FLOAT?) :: (FLOAT?)`
`cos()`	`cos(input :: FLOAT?) :: (FLOAT?)`
`cot()`	`cot(input :: FLOAT?) :: (FLOAT?)`
`degrees()`	`degrees(input :: FLOAT?) :: (FLOAT?)`	將弧度轉(zhuǎn)換為角度
`haversin()`	`haversin(input :: FLOAT?) :: (FLOAT?)`	半正矢計(jì)算
`pi()`	`pi() :: (FLOAT?)`
`radians()`	`radians(input :: FLOAT?) :: (FLOAT?)`	將角度轉(zhuǎn)換為弧度
`sin()`	`sin(input :: FLOAT?) :: (FLOAT?)`
`tan()`	`tan(input :: FLOAT?) :: (FLOAT?)`

字符串函數(shù)

Function	Signature	Description
`left()`	`left(original :: STRING?, length :: INTEGER?) :: (STRING?)`
`ltrim()`	`ltrim(input :: STRING?) :: (STRING?)`
`replace()`	`replace(original :: STRING?, search :: STRING?, replace :: STRING?) :: (STRING?)`
`reverse()`	`reverse(input :: STRING?) :: (STRING?)`
`right()`	`right(original :: STRING?, length :: INTEGER?) :: (STRING?)
`rtrim()`	`rtrim(input :: STRING?) :: (STRING?)`
`split()`	`split(original :: STRING?, splitDelimiter :: STRING?) :: (LIST? OF STRING?)`
	`split(original :: STRING?, splitDelimiters :: LIST? OF STRING?) :: (LIST? OF STRING?)`
`substring()`	`substring(original :: STRING?, start :: INTEGER?) :: (STRING?)`	從0開(kāi)始
	`substring(original :: STRING?, start :: INTEGER?, length :: INTEGER?) :: (STRING?)`
`toLower()`	`toLower(input :: STRING?) :: (STRING?)`
`toString()`	`toString(input :: ANY?) :: (STRING?)`
`toStringOrNull()`	`toStringOrNull(input :: ANY?) :: (STRING?)`
`toUpper()`	`toUpper(input :: STRING?) :: (STRING?)`
`trim()`	`trim(input :: STRING?) :: (STRING?)`

時(shí)間函數(shù)

Function	Signature	Description
`date()`	`date(input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATE?)`	創(chuàng)建DATE
`date.realtime()`	`date.realtime(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATE?)`	使用 realtime clock 創(chuàng)建當(dāng)前DATE
`date.statement()`	`date.statement(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATE?)`	使用 statement clock 創(chuàng)建當(dāng)前DATE
`date.transaction()`	`date.transaction(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATE?)`	使用 transaction clock 創(chuàng)建當(dāng)前DATE
`date.truncate()`	`date.truncate(unit :: STRING?, input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?, fields = null :: MAP?) :: (DATE?)`	截?cái)郉ATE
`datetime()`	`datetime(input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATETIME?)`
`datetime.fromepoch()`	`datetime.fromepoch(seconds :: NUMBER?, nanoseconds :: NUMBER?) :: (DATETIME?)`
`datetime.fromepochmillis()`	`datetime.fromepochmillis(milliseconds :: NUMBER?) :: (DATETIME?)`
`datetime.realtime()`	`datetime.realtime(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATETIME?)`
`datetime.statement()`	`datetime.statement(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATETIME?)`
`datetime.transaction()`	`datetime.transaction(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (DATETIME?)`
`datetime.truncate()`	`datetime.truncate(unit :: STRING?, input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?, fields = null :: MAP?) :: (DATETIME?)`
`localdatetime()`	`localdatetime(input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALDATETIME?)`
`localdatetime.realtime()`	`localdatetime.realtime(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALDATETIME?)`
`localdatetime.statement()`	`localdatetime.statement(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALDATETIME?)`
`localdatetime.transaction()`	`localdatetime.transaction(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALDATETIME?)`
`localdatetime.truncate()`	`localdatetime.truncate(unit :: STRING?, input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?, fields = null :: MAP?) :: (LOCALDATETIME?)`
`localtime()`	`localtime(input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALTIME?)`
`localtime.realtime()`	`localtime.realtime(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALTIME?)`
`localtime.statement()`	`localtime.statement(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALTIME?)`
`localtime.transaction()`	`localtime.transaction(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (LOCALTIME?)`
`localtime.truncate()`	`localtime.truncate(unit :: STRING?, input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?, fields = null :: MAP?) :: (LOCALTIME?)`
`time()`	`time(input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (TIME?)`
`time.realtime()`	`time.realtime(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (TIME?)`
`time.statement()`	`time.statement(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (TIME?)`
`time.transaction()`	`time.transaction(timezone = DEFAULT_TEMPORAL_ARGUMENT :: ANY?) :: (TIME?)`
`time.truncate()`	`time.truncate(unit :: STRING?, input = DEFAULT_TEMPORAL_ARGUMENT :: ANY?, fields = null :: MAP?) :: (TIME?)`

時(shí)鐘控制

transaction: 同一個(gè)事務(wù)，時(shí)間返回相同值。
statement: 同一個(gè)語(yǔ)句的同一次調(diào)用，時(shí)間返回相同值。
realtime: 系統(tǒng)時(shí)間。

截?cái)鄦挝?/h4>

`millennium`:千年

`century`:世紀(jì)

`decade`:十年

`year`:

`weekYear`:

`quarter`:

`month`:

`week`:

`day`:

`hour`:

`minute`:

`second`:

`millisecond`: 毫秒

`microsecond`: 微秒

示例

date([{timezone}])
RETURN date() AS currentDate
RETURN date({timezone: 'America/Los Angeles'}) AS currentDateInLA

date({year [, month, day]})
UNWIND [
date({year: 1984, month: 10, day: 11}),
date({year: 1984, month: 10}),
date({year: 1984})
] AS theDate
RETURN theDate

date({year [, week, dayOfWeek]})
UNWIND [
date({year: 1984, week: 10, dayOfWeek: 3}),
date({year: 1984, week: 10}),
date({year: 1984})
] AS theDate
RETURN theDate

所有時(shí)間函數(shù)，都支持通過(guò)一個(gè)Map對(duì)象構(gòu)造時(shí)間實(shí)例。

duration函數(shù)

Function	Signature	Description
`duration()`	`duration(input :: ANY?) :: (DURATION?)`
`duration.between()`	`duration.between(from :: ANY?, to :: ANY?) :: (DURATION?)`	計(jì)算2個(gè)時(shí)間差
`duration.inDays()`	`duration.inDays(from :: ANY?, to :: ANY?) :: (DURATION?)`
`duration.inMonths()`	`duration.inMonths(from :: ANY?, to :: ANY?) :: (DURATION?)`
`duration.inSeconds()`	`duration.inSeconds(from :: ANY?, to :: ANY?) :: (DURATION?)`

示例

duration([ {years, quarters, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds} ])
            
duration(temporalAmount)   // temporalAmount STRING類(lèi)型

duration標(biāo)準(zhǔn)字符串格式：P[nY][nM][nW][nD][T[nH][nM][nS]]，具體見(jiàn)：https://neo4j.com/docs/cypher-manual/current/values-and-types/temporal/#cypher-temporal-specifying-durations

duration.between(instant1, instant2)

字段

years
quarters
months
weeks
days
hours
minutes
seconds
milliseconds
microseconds
nanoseconds

空間函數(shù)

Function	Signature	Description
`point.distance()`	`point.distance(from :: POINT?, to :: POINT?) :: (FLOAT?)
`point()` - Cartesian 2D	`point(input :: MAP?) :: (POINT?)`
`point()` - Cartesian 3D	`point(input :: MAP?) :: (POINT?)`
`point()` - WGS 84 2D	`point(input :: MAP?) :: (POINT?)
`point()` - WGS 84 3D	`point(input :: MAP?) :: (POINT?)
`point.withinBBox()`	`point.withinBBox(point :: POINT?, lowerLeft :: POINT?, upperRight :: POINT?) :: (BOOLEAN?)`

加載 CSV 函數(shù)

Function	Signature	Description
`file()`	`file() :: (STRING?)`	返回文件路徑
`linenumber()`	`linenumber() :: (INTEGER?)`	返回行數(shù)

Graph functions

Function	Signature	Description
`graph.names()`	`graph.names() :: (LIST? OF STRING?)`
`graph.propertiesByName()`	`graph.propertiesByName(name :: STRING?) :: (MAP?)`
`graph.byName()`	`USE graph.byName(name :: STRING?)`

用戶自定義函數(shù)

Type	Description	Usage	Developing
Scalar	For each row the function takes parameters and returns a result.	Using UDF	Extending Neo4j (UDF)
Aggregating	Consumes many rows and produces an aggregated result.	Using aggregating UDF	Extending Neo4j (Aggregating UDF)

附錄

參考

https://neo4j.com/docs/cypher-manual/current/functions/文章來(lái)源地址http://www.zghlxwxcb.cn/news/detail-633413.html

到了這里，關(guān)于neo4j查詢語(yǔ)言Cypher詳解(三)--函數(shù)的文章就介紹完了。如果您還想了解更多內(nèi)容，請(qǐng)?jiān)谟疑辖撬阉鱐OY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！

本文來(lái)自互聯(lián)網(wǎng)用戶投稿，該文觀點(diǎn)僅代表作者本人，不代表本站立場(chǎng)。本站僅提供信息存儲(chǔ)空間服務(wù)，不擁有所有權(quán)，不承擔(dān)相關(guān)法律責(zé)任。如若轉(zhuǎn)載，請(qǐng)注明出處：如若內(nèi)容造成侵權(quán)/違法違規(guī)/事實(shí)不符，請(qǐng)點(diǎn)擊違法舉報(bào)進(jìn)行投訴反饋，一經(jīng)查實(shí)，立即刪除！

分享到：

領(lǐng)支付寶紅包贊助服務(wù)器費(fèi)用

圖數(shù)據(jù)庫(kù)_Neo4j學(xué)習(xí)cypher語(yǔ)言_使用CQL命令002_刪除節(jié)點(diǎn)_刪除屬性_結(jié)果排序Order By---Neo4j圖數(shù)據(jù)庫(kù)工作筆記0006
然后我們?cè)賮?lái)看如何刪除節(jié)點(diǎn) ? 可以看到首先 ? 我們這里 ? 比如我要?jiǎng)h除張三可以看到 match (n:student) where n.name = \\\"張三\\\" delete n 這樣就是刪除了student集合中,name是張三的節(jié)點(diǎn) ? 然后我們?cè)賮?lái)看如何來(lái)刪除關(guān)系 match (n:student)-[r]-(m:student) where n.name=\\\"小
2024年02月12日
瀏覽(31)
圖數(shù)據(jù)庫(kù)_Neo4j學(xué)習(xí)cypher語(yǔ)言_使用CQL_構(gòu)建明星關(guān)系圖譜_導(dǎo)入明星數(shù)據(jù)_導(dǎo)入明星關(guān)系數(shù)據(jù)_創(chuàng)建明星關(guān)系---Neo4j圖數(shù)據(jù)庫(kù)工作筆記0009
首先找到明星數(shù)據(jù) ? 可以看到有一個(gè)sheet1,是,記錄了所有的關(guān)系的數(shù)據(jù) ? 然后比如我們搜索一個(gè)撒貝寧,可以看到撒貝寧的數(shù)據(jù) ? 然后這個(gè)是構(gòu)建的CQL語(yǔ)句 ? 首先我們先去啟動(dòng)服務(wù) neo4j console ? ? 然后我們?cè)賮?lái)看一下以前導(dǎo)入的,可以看到導(dǎo)入很簡(jiǎn)單, 就是上面有CQL 看一下節(jié)
2024年02月12日
瀏覽(28)
圖數(shù)據(jù)庫(kù)Neo4j——Neo4j簡(jiǎn)介、數(shù)據(jù)結(jié)構(gòu) & Docker版本的部署安裝 & Cypher語(yǔ)句的入門(mén)
MySQL是一種開(kāi)源的關(guān)系型數(shù)據(jù)庫(kù)管理系統(tǒng)，使用SQL作為其查詢語(yǔ)言，常見(jiàn)的關(guān)系型數(shù)據(jù)庫(kù)有MySQL、Oracle、SQL Server、PostgreSQL等。相關(guān)博客文章如下：【合集】MySQL的入門(mén)進(jìn)階強(qiáng)化——從普通人到超級(jí)賽亞人的華麗轉(zhuǎn)身 PostgreSQL數(shù)據(jù)庫(kù)——Docker版本的postgres安裝 Navicat連接方式
2024年02月06日
瀏覽(51)
Neo4j Cypher語(yǔ)法教程實(shí)體、關(guān)系增刪改、高級(jí)查詢
安裝完neo4j ，訪問(wèn)對(duì)應(yīng)的web頁(yè)面端口，輸入以下命令進(jìn)行學(xué)習(xí) 創(chuàng)建節(jié)點(diǎn) 創(chuàng)建一個(gè)標(biāo)簽為stu的節(jié)點(diǎn) （標(biāo)簽：將數(shù)據(jù)進(jìn)行分類(lèi)，方便管理）創(chuàng)建一個(gè)標(biāo)簽為stu 且?guī)в袑傩灾档墓?jié)點(diǎn) 查詢節(jié)點(diǎn) 按照標(biāo)簽查詢運(yùn)行結(jié)果如下圖 neo4j默認(rèn)是將name屬性用于展示按照id進(jìn)行查詢按照屬性進(jìn)
2024年02月06日
瀏覽(22)
圖數(shù)據(jù)庫(kù)Neo4j學(xué)習(xí)二——cypher基本語(yǔ)法
名稱應(yīng)以字母字符開(kāi)頭，不以數(shù)字開(kāi)頭，名稱不應(yīng)包含符號(hào)，下劃線除外可以很長(zhǎng)，最多65535( 2^16 - 1) 或65534字符，具體取決于 Neo4j 的版本名稱區(qū)分大小寫(xiě)。:PERSON和:Person是:person三個(gè)不同的標(biāo)簽，并且n和N是兩個(gè)不同的變量。前導(dǎo)和尾隨空白字符將被自動(dòng)刪除。例如，以下
2024年02月16日
瀏覽(52)
圖數(shù)據(jù)庫(kù) 之 Neo4j - Cypher語(yǔ)法基礎(chǔ)(5)
節(jié)點(diǎn)(Nodes) Cypher使用()來(lái)表示一個(gè)節(jié)點(diǎn)。屬性可以用來(lái)存儲(chǔ)信息或者來(lái)?xiàng)l件匹配(查找）創(chuàng)建節(jié)點(diǎn) 創(chuàng)建如下節(jié)點(diǎn)
2024年02月19日
瀏覽(22)
知識(shí)圖譜實(shí)戰(zhàn)應(yīng)用23-【知識(shí)圖譜的高級(jí)用法】Neo4j圖算法的Cypher查詢語(yǔ)句實(shí)例
大家好，我是微學(xué)AI，今天給大家介紹一下知識(shí)圖譜實(shí)戰(zhàn)應(yīng)用23-【知識(shí)圖譜的高級(jí)用法】Neo4j圖算法的Cypher查詢語(yǔ)句實(shí)例，Neo4j圖算法是一套在Neo4j圖數(shù)據(jù)庫(kù)上運(yùn)行的算法集合。這些算法專(zhuān)門(mén)針對(duì)圖數(shù)據(jù)結(jié)構(gòu)進(jìn)行設(shè)計(jì)，用于分析、查詢和處理圖數(shù)據(jù)。圖算法可以幫助我們發(fā)現(xiàn)圖
2024年02月14日
瀏覽(15)
neo4j教程-Cypher操作
Cypher是圖形存儲(chǔ)數(shù)據(jù)庫(kù)Neo4j的查詢語(yǔ)言，Cypher是通過(guò)模式匹配N(xiāo)eo4j數(shù)據(jù)庫(kù)中的節(jié)點(diǎn)和關(guān)系，從而對(duì)數(shù)據(jù)庫(kù)Neo4j中的節(jié)點(diǎn)和關(guān)系進(jìn)行一系列的相關(guān)操作。下面，通過(guò)一張表來(lái)介紹一下常用的Neo4j操作命令及相關(guān)說(shuō)明，具體如表所示。操作命令相關(guān)說(shuō)明 CREATE 創(chuàng)建節(jié)點(diǎn)、關(guān)系 MATC
2024年02月15日
瀏覽(20)
Neo4j 與 Cypher 基礎(chǔ)
更好的閱讀體驗(yàn) huge{color{red}{更好的閱讀體驗(yàn)}} 更好的閱讀體驗(yàn) Neo4j 是用 Java 實(shí)現(xiàn)的開(kāi)源 NoSQL 圖數(shù)據(jù)庫(kù)。從2003年開(kāi)始開(kāi)發(fā)，2007年正式發(fā)布第一版，其源碼托管于 GitHub。與常見(jiàn)的關(guān)系型數(shù)據(jù)庫(kù)不同， Neo4j 基于圖圖結(jié)構(gòu)來(lái)表示和存儲(chǔ)數(shù)據(jù)，并提供了申明式的查詢語(yǔ)言 Cypher
2024年02月07日
瀏覽(14)
圖數(shù)據(jù)庫(kù)Neo4j——SpringBoot使用Neo4j & 簡(jiǎn)單增刪改查 & 復(fù)雜查詢初步
圖形數(shù)據(jù)庫(kù)是專(zhuān)門(mén)用于存儲(chǔ)圖形數(shù)據(jù)的數(shù)據(jù)庫(kù)，它使用圖形模型來(lái)存儲(chǔ)數(shù)據(jù)，并且支持復(fù)雜的圖形查詢。常見(jiàn)的圖形數(shù)據(jù)庫(kù)有Neo4j、OrientDB等。 Neo4j是用Java實(shí)現(xiàn)的開(kāi)源NoSQL圖數(shù)據(jù)庫(kù)，本篇博客介紹如何在SpringBoot中使用Neo4j圖數(shù)據(jù)庫(kù)，如何進(jìn)行簡(jiǎn)單的增刪改查，以及如何進(jìn)行復(fù)雜
2024年02月06日
瀏覽(34)

<menu id="bcbjj"></menu>