使用neo4j实现商品购买python代码实现

好的，下面是一份使用 Neo4j 实现商品购买关系的 Python 代码示例：

from neo4j import GraphDatabase

# 连接到 Neo4j 数据库
uri = "bolt://localhost:7687"
driver = GraphDatabase.driver(uri, auth=("username", "password"))

# 创建节点和关系
def create_node(tx, name, label):
    tx.run("MERGE (n:%s {name: $name})" % label, name=name)

def create_relationship(tx, name1, name2):
    tx.run("MATCH (n1), (n2) WHERE n1.name = $name1 AND n2.name = $name2 CREATE (n1)-[:PURCHASED]->(n2)", name1=name1, name2=name2)

# 添加节点和关系
def add_purchase(tx, customer_name, product_name):
    tx.run("MERGE (c:Customer {name: $customer_name})", customer_name=customer_name)
    tx.run("MERGE (p:Product {name: $product_name})", product_name=product_name)
    tx.run("MATCH (c:Customer {name: $customer_name}), (p:Product {name: $product_name}) CREATE (c)-[:PURCHASED]->(p)", customer_name=customer_name, product_name=product_name)

# 查询购买关系
def find_purchases(tx, customer_name):
    result = tx.run("MATCH (c:Customer {name: $customer_name})-[:PURCHASED]->(p:Product) RETURN p.name", customer_name=customer_name)
    return [record["p.name"] for record in result]

# 测试代码
with driver.session() as session:
    # 添加节点和关系
    session.write_transaction(create_node, "Alice", "Customer")
    session.write_transaction(create_node, "Bob", "Customer")
    session.write_transaction(create_node, "iPhone", "Product")
    session.write_transaction(create_node, "MacBook", "Product")
    session.write_transaction(create_relationship, "Alice", "iPhone")
    session.write_transaction(create_relationship, "Bob", "MacBook")
    session.write_transaction(create_relationship, "Alice", "MacBook")

    # 添加购买记录
    session.write_transaction(add_purchase, "Alice", "iPhone")
    session.write_transaction(add_purchase, "Bob", "MacBook")
    session.write_transaction(add_purchase, "Alice", "MacBook")

    # 查询购买记录
    result = session.read_transaction(find_purchases, "Alice")
    print(result)

这个示例代码包括了 Neo4j 数据库的连接和节点/关系的创建，以及添加购买记录和查询购买记录等操作。你可以根据你的具体需求进行修改和调整。