java 代码 Neo4j 实现设备根据异常判断故障,再根据故障返回相关解决方案,并计算匹配的解决方案相应概率是多少
时间: 2024-02-01 13:14:52 浏览: 225
以下是Java代码示例,使用Neo4j实现设备根据异常判断故障,并基于故障返回相关解决方案,并计算匹配的解决方案相应概率。该示例假设您已经安装了Neo4j数据库并且已经设置好了相关的连接信息,以及已经建立了合适的图数据库结构:
```java
import org.neo4j.driver.*;
public class DeviceTroubleshooting {
// Neo4j数据库连接信息
private static final String uri = "bolt://localhost:7687";
private static final String username = "neo4j";
private static final String password = "password";
// 根据异常查询对应的故障,并返回故障对应的解决方案
public String getSolution(String exception) {
// 建立Neo4j数据库驱动
try (Driver driver = GraphDatabase.driver(uri, AuthTokens.basic(username, password))) {
// 建立会话
try (Session session = driver.session()) {
// 查询异常对应的故障
String query = "MATCH (e:Exception)-[:CAUSES]->(f:Fault) WHERE e.name = $exception RETURN f.name";
Result result = session.run(query, Values.parameters("exception", exception));
String fault = result.single().get(0).asString();
// 查询故障对应的解决方案
query = "MATCH (f:Fault)-[:SOLVED_BY]->(s:Solution) WHERE f.name = $fault RETURN s.name";
result = session.run(query, Values.parameters("fault", fault));
String solution = result.single().get(0).asString();
// 计算解决方案相应概率
query = "MATCH (f:Fault)-[:SOLVED_BY]->(s:Solution) WHERE f.name = $fault WITH COUNT(s) AS total " +
"MATCH (f:Fault)-[:SOLVED_BY]->(s:Solution) WHERE f.name = $fault AND s.name = $solution " +
"RETURN toFloat(COUNT(s)) / total";
result = session.run(query, Values.parameters("fault", fault, "solution", solution));
float probability = result.single().get(0).asFloat();
// 返回故障对应的解决方案及相应概率
return "Solution: " + solution + ", Probability: " + probability;
}
}
}
}
```
使用该代码,您可以调用 `getSolution` 方法并传入异常名称作为参数,该方法将返回故障对应的解决方案及相应概率。例如:
```java
DeviceTroubleshooting dt = new DeviceTroubleshooting();
String solution = dt.getSolution("Connection timed out");
System.out.println(solution);
```
该示例将查询名为“Connection timed out”的异常对应的故障,并返回故障对应的解决方案及相应概率。
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