如何处理连接到Neo4j失败的情况?
时间: 2024-09-29 19:15:04 浏览: 31
处理连接到Neo4j失败的情况,通常会在尝试连接和执行操作时使用`try-except`语句来捕获可能出现的异常。例如,`neo4j.exceptions.ServiceUnavailable`可能是最常见的连接失败异常之一,表示服务器不可用。以下是一个简单的示例:
```python
from neo4j import GraphDatabase
from neo4j.exceptions import ServiceUnavailable
uri = "bolt://localhost:7687"
user = "neo4j"
password = "your_password"
driver = None
while not driver or driver.is_disconnected():
try:
driver = GraphDatabase.driver(uri, auth=(user, password), encrypted=False)
print("Connected to Neo4j successfully.")
except ServiceUnavailable as e:
print(f"Failed to connect: {e}. Retrying...")
driver.close()
time.sleep(5) # 暂停一段时间再试,避免频繁请求导致封禁
with driver.session() as session:
try:
# 执行你的查询
result = session.run("MATCH (n) RETURN n")
for record in result:
print(record["n"])
except Exception as e:
print(f"An error occurred during query execution: {e}")
```
在这个例子中,如果连接失败,程序会等待5秒然后再次尝试,直到成功建立连接为止。当然,实际应用中可能需要根据服务的可用性和你的需求调整重试策略。