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本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

过滤导出内容的示例

以下示例说明了过滤导出数据的方法。

筛选属性图数据的导出

使用的示例scope只导出边

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

使用的示例nodeLabels和edgeLabels仅导出具有特定标签的节点和边

这些区域有：nodeLabels以下示例中的参数指定只有节点具有Person标签或Post应该导出标签。这些区域有：edgeLabels参数指定只有带likes应该导出标签：

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

使用的示例filter仅导出指定的节点、边缘和属性

这些区域有：filter本示例中的对象导出country带有他们的节点type、code和desc房地产，还有route他们的边缘dist财产。

{
  "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"
}

使用的示例gremlinFilter

此示例使用gremlinFilter仅导出那些在 2021-10-10 之后创建的节点和边（也就是说，created价值大于 2021-10-10 的财产）：

{
  "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"
}

使用的示例gremlinNodeFilter

此示例使用gremlinNodeFilter仅导出已删除的节点（带有布尔值的节点）deleted价值为的财产true):

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

使用的示例gremlinEdgeFilter

此示例使用gremlinEdgeFilter 只导出带有strength值为 5 的数字属性：

{
  "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

这些区域有：filter本示例中的对象导出：

这些区域有：gremlinNodeFilter参数过滤节点，以便只有具有code其值以 A 开头的属性将被导出。

这些区域有：nodeLabels和edgeLabels参数进一步限制输出，以便只airport节点和route边缘将被导出。

最后，scope参数从导出中删除边缘，这只保留指定的airport输出中的节点。

{
  "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

此示例导出了谓词为 < http://kelvinlawrence.net/air-routes/objectProperty/route > 且其对象不是文字的三元组：

{
  "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"
}