Neo4j CSV 导入状态更新

Question

所以我正在尝试从Mysql数据库迁移到neo4j数据库。对于新的 neo4j 数据库，我计划了新闻源功能，如下所述 http://neo4j.com/docs/stable/cypher-cookbook-newsfeed.html这种机制显然与 mysql 不同，mysql 的新闻源只是一堆行。那么有没有办法以 -[status_update]->()-[next]->()- 格式快速将 mysql 行导入到 neo4j 中呢？目前我有 mysql 数据库，如下所示:

user table
+-------+--------------+
| id    | username     |
+-------+--------------+
| 1     | pewpewlasers |
+-------+--------------+

posts table
+-------+----------+------------+
| id    | user_id  | status     |
+-------+----------+------------+
| 1     | 1        | something  |
+-------+----------+------------+
| 2     | 1        | new update |
+-------+----------+------------+

Answer 1

如果将其输出为 CSV，则可以使用LOAD CSV，如下所示:

USING PERIODIC COMMIT 1000
LOAD CSV WITH HEADERS FROM "file:///path/to/file/user.csv" AS line
CREATE (:User {id: toInt(line.id), username: line.username});

USING PERIODIC COMMIT 1000
LOAD CSV WITH HEADERS FROM "file:///path/to/file/posts.csv" AS line
CREATE (:Post {id: toInt(line.id), line.status});

USING PERIODIC COMMIT 1000
LOAD CSV WITH HEADERS FROM "file:///path/to/file/posts.csv" AS line
MATCH (user:User {id: toInt(line.user_id)})
MATCH (post:Post {id: toInt(line.id)})
CREATE user-[:status_update]->post;

USING PERIODIC COMMIT 1000
LOAD CSV WITH HEADERS FROM "file:///path/to/file/posts.csv" AS line
MATCH
  (post:Post {id: toInt(line.id)})
  (previous_post:Post {id: toInt(line.id) - 1})
CREATE previous_post-[:next]->post;

您也许可以组合其中一些，但由于这里提到的 EAGER 问题，我总是小心地拆分查询:

http://www.markhneedham.com/blog/2014/10/23/neo4j-cypher-avoiding-the-eager/