【问题标题】:Can a Python dictionary be passed as Neo4j Literal Maps?Python 字典可以作为 Neo4j Literal Maps 传递吗?
【发布时间】:2026-02-02 16:30:01
【问题描述】:

我是一个从 Neo4j 和 Python 开始的新手。我正在尝试使用 Python 驱动程序将一些数据填充到 Neo4j 中。

我想知道是否可以将 Python 字典作为 Neo4j 文档中描述的文字映射传递。

这将使我能够立即设置应用程序节点属性。属性因节点而异,因此代码会变得很难看。

下面给出一个例子

node1 = {
  'def': '"A protein transport process that contributes to protein import into the nucleus, and that results in the vectorial transfer of a cargo-carrier protein complex through the nuclear pore complex from the cytoplasmic side to the nucleoplasmic side of the nuclear envelope." [GOC:curators, ISBN:019 8506732, PMID:14570049, PMID:9126736]',
  'id': 'GO:0000060',
  'is_a': ['GO:0006886'],
  'name': 'protein import into nucleus, translocation',
  'namespace': 'biological_process',
  'relationship': ['part_of GO:0006606'],
  'synonym': [ '"protein import into cell nucleus, translocation" EXACT []' ]
}

node2 = {
    'def': '"A protein complex disassembly process that contributes to protein import into the nucleus, and that results in the dissociation of the cargo protein and the carrier (such as an importin alpha/beta heterodimer) from each other and from the nuclear pore complex." [GOC:mah, PMID:14570049, PMID:9126736, PMID:9687515]',
    'id': 'GO:0000061',
    'is_a': ['GO:0043624'],
    'name': 'protein import into nucleus, substrate release',
    'namespace': 'biological_process',
    'relationship': ['part_of GO:0006606'],
    'is_obselete' : True
}

session.run 允许将参数传递给 Cypher 查询,但可以将 python 字典传递给查询,并作为 Neo4j 文字地图

【问题讨论】:

    标签: python dictionary neo4j


    【解决方案1】:

    传递 dict as 参数会将其转换为 Map,其行为与您在 Cypher 中声明的 Map 完全相同。我认为你正在画一个不存在的区别。

    some_python_dict = {'a': 1, 'b': 2}
    session.run(
        statement="CREATE (x) SET x = {dict_param}",
        parameters={'dict_param': some_python_dict}
    )
    

    这正是您通常从语言驱动程序设置节点的方式。如果您正在制作多个,请传递一个参数,它是一个 dicts 列表,然后 UNWIND 该参数开始,您将获得最佳性能。

    【讨论】: