database 如何重置/清除/删除neo4j数据库？
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How to reset / clear / delete neo4j database?
提问by Somnath Muluk
We can delete all nodes and relationships by following query.
我们可以通过以下查询删除所有节点和关系。
MATCH (n) OPTIONAL MATCH (n)-[r]-() DELETE n,r
But newly created node get internal id as ({last node internal id} + 1) . It doesn't reset to zero.
但是新创建的节点将内部 id 设为 ({last node internal id} + 1) 。它不会重置为零。
How can we reset neo4j database such as newly created node will get id as 0?
我们如何重置neo4j数据库，例如新创建的节点将获得id为0？
From 2.3, we can delete all nodes with relationships,
从2.3开始，我们可以删除所有有关系的节点，
MATCH (n)
DETACH DELETE n
回答by Stefan Armbruster
Shut down your Neo4j server, do a rm -rf data/graph.dband start up the server again. This procedure completely wipes your data, so handle with care.
关闭您的 Neo4j 服务器，执行 arm -rf data/graph.db并再次启动服务器。此过程会完全擦除您的数据，因此请小心处理。
回答by Rajitha Fernando
run both commands.
运行这两个命令。
match (a) -[r] -> () delete a, r
above command will delete all nodes with relationships. then run ,
上面的命令将删除所有有关系的节点。然后运行，
match (a) delete a
and it will delete nodes that have no relationships.
它将删除没有关系的节点。
回答by Jordan Morris
If you are using it on a docker container, you can do
如果您在 docker 容器上使用它，则可以执行
docker-compose rm -f -s -v myNeo4jService
docker-compose rm -f -s -v myNeo4jService
回答by makiko_fly
Since neo4j only runs current database specified in the conf file, an easy way to start a new and clean db is to change the current database in the neo4j.conf file and then restart neo4j server.
由于neo4j 只运行conf 文件中指定的当前数据库，因此启动一个新的干净数据库的简单方法是更改neo4j.conf 文件中的当前数据库，然后重新启动neo4j 服务器。
dbms.active_database=graph.db --> dbms.active_database=graph2.db
Some might argue that the database name is changed. But as of this writing [2018-12], neo4j doesn't support multiple database instances. There is no need for us to differentiate between databases, thus the name of the database is not used in our code.
有些人可能会争辩说数据库名称已更改。但是在撰写本文时 [2018-12]，neo4j 不支持多个数据库实例。我们不需要区分数据库，因此我们的代码中不使用数据库的名称。
