Neo4J-是否可以可视化我的数据库的简单概述？ 我已经有了我的图形数据库，填充了节点，关系，属性等。我想查看整个数据库如何连接，每个节点，每个节点，a ...

Question

您可以通过运行命令call db.schema().

来使用元数据。

Answer 1

Neo4J v4

call db.schema()

已弃用，您现在可以使用

call db.schema.visualization()

Answer 2

据我所知，没有直接的方法可以获取NEO4J数据库结构的正确图像图。

中有NEO4J浏览器中的预定义查询，可以找到所有节点类型及其关系。但是，它遍历完整的图，并且如果您需要大量数据，可能会因内存错误而失败。

Answer 3

，也有Neoprofiler。这是一种声称您问的工具。我从未尝试过，并且最近没有得到太多更新。仍然值得一试：

https：//github.com/moxious/neoprofiler

evev，尽管这不是图形表示，但此查询将使您了解哪种类型的节点已连接到其他节点与哪种类型的关系连接。

MATCH (n)
OPTIONAL MATCH (n)-[r]->(x)
WITH DISTINCT {l1: labels(n), r: type(r), l2: labels(x)}
AS `first degree connection`
RETURN `first degree connection`;

您可以使用此查询来放松标签，以动态（通过脚本语言和使用REST API）动态编写该标签，然后将查询粘贴到Neo4J浏览器中以获取数据集。

但这应该足够好，可以概述您的图形。从这里扩展

Answer 4

CALL db.schema.visualization()

有效，但我找不到一种获得节点或关系属性的方法。

CALL apoc.meta.schema()

Answer 5

APOC

以使数据库使用它，这并不是那么麻烦。

1. 您可以通过执行几个Cypher查询来构建自己的图表。这是PowerShell和GraphViz的解决方案：
   
   1。在powershell
中定义这两个功能

2. Invoke-CypherNeo4j

   有点长，但是它支持参数和交易，这些参数和交易未使用。
   

   Get-Neo4jGraphvizSchema
   

   2。安装GraphViz

   它是一个CLI应用程序，它将使用图形的字符串表示形式，并将绘制PDF，PNG，SVG等。
3。使用Get-neo4JgraphvizSchema函数

<#
.SYNOPSIS
Execute a Cypher and get a response.
.DESCRIPTION
Sends a given cypher to DB named 'neo4j' through Neo4j HTTP Connector and returns a response in form of Powershell objects.
When given array of Cyphers, they will be executed in a single transaction (doesn't support params).
At first call in current session will ask for username/password for 'neo4j' DB.
.PARAMETER Cypher
Single string with a cypher or array of strings, each is a cypher.
.PARAMETER Params
Hashmap of parameters which will be available in cypher.
.PARAMETER Raw
Return a database response as-is (json string).
.EXAMPLE
Invoke-CypherNeo4j 'RETURN $x + $y' -Params @{x=5; y=4}
# Output: 9
.EXAMPLE
Invoke-CypherNeo4j 'RETURN 2+1 AS sum' -Raw
# Output: {"results":[{"columns":["sum"],"data":[{"row":[3],"meta":[null]}]}],"errors":[],"lastBookmarks":["FB:kcwQCwnhVTLxT1GEJwIi+AH8pyiQ"]}
.EXAMPLE
Invoke-CypherNeo4j 'MATCH (n) DETACH DELETE n;','RETURN 6/0 AS fail;' | ConvertTo-Json -Compress
# Output: {"code":"Neo.ClientError.Statement.ArithmeticError","message":"/ by zero"}
# (nothing will be deleted)
#>
function Invoke-CypherNeo4j {
    [CmdletBinding()]
    param(
        [Parameter(ValueFromPipeline)]$Cypher, 
        [HashTable]$Params,
        [switch]$Raw = $false
    )
    if ($null -eq $neo4jCred) {$Global:neo4jCred = Get-Credential}
    
    if ($Cypher -is [array]) {      
        $stmts = $Cypher | % { @{statement=$_;} }
        $bodyJson = @{ statements=@($stmts)} | ConvertTo-Json -d 99
    } else {
        $bodyJson = @{ statements=@( @{statement=$cypher; parameters=$params}) } | ConvertTo-Json -d 99
    }
    $respJson = Invoke-WebRequest http://localhost:7474/db/neo4j/tx/commit -Method Post -ContentType 'application/json' -Body $bodyJson -Credential $neo4jCred -AllowUnencryptedAuthentication | % Content
    $resp = $null
    if ($raw) {return $respJson} else {$resp = $respJson | ConvertFrom-Json -d 99}
    if ($resp.errors.Count -ne 0) {return $resp.errors}
    else {
        $results = [collections.arraylist]@()
        foreach ($result in $resp.results) {
            $objects = $result.data | % {
                $obj = [ordered]@{}
                for ($i = 0; $i -lt $_.row.count; $i++) {
                     $key = ([array]($result.columns)).get($i)
                     $value = $_.row[$i]
                     $obj[$key] = $value
                }
                [pscustomobject]$obj
            }
            $results.add( @($objects) ) | Out-Null
        }
        if ($results.count -eq 1) {
            # Write-host ($results | toJson -d 9)
            return ([array]$results).get(0)
        } else {
            return $results
        }
    }
}

<#
.SYNOPSIS
Builds a Graphviz representation of database schema.
.DESCRIPTION
Executes multiple cypher queries by calling Invoke-CypherNeo4j function and builds a Graphviz string.
TODO: bold/italic for constraints and indexes
TODO: switch to display relationships as nodes
TODO: what will hapen if some nodes have multiple labels?
#>
function Get-Neo4jGraphvizSchema {
    [CmdletBinding()]
    param(
        [switch]$IncludeCardinality = $false
    )
    # Get a count for each Label
    $cypherCounts = 'MATCH (n) RETURN count(n) AS count, labels(n) AS labels;'
    $nodes = Invoke-CypherNeo4j $cypherCounts
    $labelToCount = @{}
    $nodes  | % { $labelToCount[$_.labels[0]] = $_.count }
    
    # Get a count for each combination Label-rel->Label
    $cypher = @'
MATCH (from)-[r]->(to)
RETURN DISTINCT labels(from) as from,type(r) as rel, labels(to) as to,count(r) AS count
'@
    $rels = Invoke-CypherNeo4j $cypher
    
    # Get node property info
    $props = Invoke-CypherNeo4j 'CALL db.schema.nodeTypeProperties'
    $map = $props | % {$_.nodeLabels[0],$_.propertyName,$_.propertyTypes[0] -join "`t"} | ConvertFrom-Csv -delim "`t" -hea label,propName,propType | group label -AsHashTable
    
    $nodeDefs = $nodes | % {
        $id = $_.labels -join ''
        $count = $_.count
        $propsDef = $map[$id] | % {"$($_.propName): $($_.propType)\l"} | Join-String
        $nodeDef = "$id [label=""$id ($count)|$propsDef""]"
        $nodeDef
    }
    $i = 0
    $edgeDefs = $rels | % {
        $from = $_.from[0]
        $to = $_.to[0]
        $relType = $_.rel
        $count = $_.count
        $headTailLabel = $null
        if ($IncludeCardinality) {
            $fromCount = $nodes | ? {$_.labels[0] -eq $from} | % count
            $toCount = $nodes | ? {$_.labels[0] -eq $to} | % count
            $fromCardin = '{0:#0.##}' -f ($count/$fromCount)
            $toCardin = '{0:#0.##}' -f ($count/$toCount)
            
            $headTailLabel = "taillabel=$fromCardin headlabel=$toCardin"
        }
        "$from -> $to [label="":$relType ($count)"" $headTailLabel]"
    }
    # save query results
    $global:neo4jSchemaData = [pscustomobject]@{nodes = $nodes; rels = $rels; props = $props; cardinality=$Cardinality}
    Write-Host -foreg green Cypher results have been saved to `$neo4jSchemaData variable
    
    
return @"
digraph G {
rankdir=LR
node [shape=Mrecord]
$($nodedefs -join "`n")
$($edgeDefs -join "`n")
} 
"@
}

Answer 6

这是您将获得内置电影DB的收益：

这是用于内置的西北db：

seneme的弦乐表示

贝洛是电影DB功能的实际输出。如果您不想在本地安装GraphViz，则可以将此字符串复制到任何

ONLINE graphviz工具

# build and open pdf
Get-Neo4jGraphvizSchema | dot -Tpdf -o schema.gv.pdf; start schema.gv.pdf
# or
# save graphviz string to $gv variable and build a properly scaled png
Get-Neo4jGraphvizSchema -IncludeCardinality -OutVariable gv | dot -Tpng -Gdpi=256 -o schema.gv.png; start schema.gv.png

Get-Neo4jGraphvizSchema