筛选导出内容的示例

以下示例说明了筛选导出的数据的方法。

筛选属性图数据的导出

使用 scope 仅导出边缘的示例

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "scope": "edges"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

使用 nodeLabels 和 edgeLabels 仅导出带有特定标签的节点和边缘的示例

以下示例中的 nodeLabels 参数指定只应导出带有 Person 标签或 Post 标签的节点。edgeLabels 参数指定只应导出带有 likes 标签的边缘：

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "nodeLabels": ["Person", "Post"],
    "edgeLabels": ["likes"]
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

使用 filter 仅导出指定节点、边缘和属性的示例

此示例中的 filter 对象导出带有 type、code 和 desc 属性的 country 节点，还导出带有 dist 属性的 route 边缘。

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "filter": {
      "nodes": [
        {
          "label": "country",
          "properties": [
            "type",
            "code",
            "desc"
          ]
        }
      ],
      "edges": [
        {
          "label": "route",
          "properties": [
            "dist"
          ]
        }
      ]
    }
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

使用 gremlinFilter 的示例。

此示例使用 gremlinFilter 以仅导出 2021-10-10 之后创建的节点和边缘（即其 created 属性值大于 2021-10-10）：

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "gremlinFilter" : "has(\"created\", gt(datetime(\"2021-10-10\")))"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

使用 gremlinNodeFilter 的示例。

此示例使用 gremlinNodeFilter 以仅导出已删除的节点（其布尔 deleted 属性的值为 true 的节点）：

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "gremlinNodeFilter" : "has(\"deleted\", true)"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

使用 gremlinEdgeFilter 的示例。

此示例使用 gremlinEdgeFilter 以仅导出具有 strength 数值属性且属性值为 5 的边缘：

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "gremlinEdgeFilter" : "has(\"strength\", 5)"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

组合 filter、gremlinNodeFilter、nodeLabels、edgeLabels 和 scope

此示例中的 filter 对象导出：

• 带有其 type、code 和 desc 属性的 country 节点

• 带有其 code、icao 和 runways 属性的 airport 节点

• 带有其 dist 属性的 route 边缘

gremlinNodeFilter 参数筛选节点，以便仅导出具有 code 属性且属性值以 A 开头的节点。

nodeLabels 和 edgeLabels 参数进一步限制了输出，因此只输出 airport 节点和 route 边缘。

最后，scope 参数消除了输出中的边缘，从而在输出中只留下指定的 airport 节点。

{
  "command": "export-pg",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "filter": {
      "nodes": [
        {
          "label": "airport",
          "properties": [
            "code",
            "icao",
            "runways"
          ]
        },
        {
          "label": "country",
          "properties": [
            "type",
            "code",
            "desc"
          ]
        }
      ],
      "edges": [
        {
          "label": "route",
          "properties": [
            "dist"
          ]
        }
      ]
    },
    "gremlinNodeFilter": "has(\"code\", startingWith(\"A\"))",
    "nodeLabels": [
      "airport"
    ],
    "edgeLabels": [
      "route"
    ],
    "scope": "nodes"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

筛选 RDF 数据的导出

使用 rdfExportScope 和 sparql 导出特定边缘

此示例导出其谓词为 <http://kelvinlawrence.net/air-routes/objectProperty/route> 且其对象不是文本的三元组：

{
  "command": "export-rdf",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "rdfExportScope": "query",
    "sparql": "CONSTRUCT { ?s <http://kelvinlawrence.net/air-routes/objectProperty/route> ?o } WHERE { ?s ?p ?o . FILTER(!isLiteral(?o)) }"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}

namedGraph用于导出单个命名的图表

此示例导出属于命名图的三元组 < http://aws.amazon.com/neptune/vocab/v01/ DefaultNamedGraph >：

{
  "command": "export-rdf",
  "params": {
    "endpoint": "(your Neptune endpoint DNS name)",
    "rdfExportScope": "graph",
    "namedGraph": "http://aws.amazon.com/neptune/vocab/v01/DefaultNamedGraph"
  },
  "outputS3Path": "s3://(your Amazon S3 bucket)/neptune-export"
}