Question

在'mysql' => [ 'driver' => 'mysql', 'host' => $host, 'database' => $database, 'username' => $username, 'password' => $password, // 'host' => env('DB_HOST', 'localhost'), // 'database' => env('DB_DATABASE', 'forge'), // 'username' => env('DB_USERNAME', 'forge'), // 'password' => env('DB_PASSWORD', ''), // 'unix_socket' => '/Applications/MAMP/tmp/mysql/mysql.sock', 'charset' => 'utf8', 'collation' => 'utf8_unicode_ci', 'prefix' => '', 'strict' => false, ],期间，我将字段转换为带LOAD CSV的整数，虽然我没有收到任何错误（以及数据加载），但该属性仍被视为字符串。

下面是我运行以填充数据库的代码。我有一个小玩具数据集，您可以在下面参考。

toInt

但是当我在另一个查询中引用该属性时

// Import the HS Cluster nodes
USING PERIODIC COMMIT 10000
LOAD CSV WITH HEADERS FROM "https://docs.google.com/spreadsheets/d/11f7-aEN-OURzzPY97Cm8vWZN1lNqYpSmCocNkzAoQe8/pub?gid=0&single=true&output=csv" as row
WITH row
MERGE (s:Student {sid:row.id});


// Import the contacts
// THIS IS THE QUERY THAT I AM USING toINT
USING PERIODIC COMMIT 10000
LOAD CSV WITH HEADERS FROM "https://docs.google.com/spreadsheets/d/11f7-aEN-OURzzPY97Cm8vWZN1lNqYpSmCocNkzAoQe8/pub?gid=0&single=true&output=csv" as row
WITH row
MERGE (c:Contact {cid:row.cid, seqnum: toInt(row.seqnum)} );


// Connect the next contacts together
USING PERIODIC COMMIT 10000
LOAD CSV WITH HEADERS FROM "https://docs.google.com/spreadsheets/d/11f7-aEN-OURzzPY97Cm8vWZN1lNqYpSmCocNkzAoQe8/pub?gid=0&single=true&output=csv" as row
WITH row
WHERE row.nextcid <> 'NA'
MERGE (c:Contact {cid:row.cid})
MERGE (n:Contact {cid:row.nextcid})
MERGE (c)-[:NEXT]->(n);

但这会产生// I expected this to work USING PERIODIC COMMIT 10000 LOAD CSV WITH HEADERS FROM "https://docs.google.com/spreadsheets/d/11f7-aEN-OURzzPY97Cm8vWZN1lNqYpSmCocNkzAoQe8/pub?gid=0&single=true&output=csv" as row WITH row WHERE row.seqnum = 1 MERGE (c:Contact {cid:row.cid}) MERGE (s:Student {sid:row.id}) MERGE (s)-[:HAS_CONTACT]->(c);

但是，当我将(no changes, no rows)作为字符串引用时，它会按预期工作

seqnum

我错过了什么？

供参考，我正在运行neo4j 2.3.1的社区版，我在OSX 10.9.5上。

非常感谢任何帮助。

Answer 1

在“预期工作”部分中，您可以过滤CSV文件中的属性，而不是在节点上：

WHERE row.seqnum = 1 // this is still a string from your CSV file

您转换了节点上的seqnum属性，CSV文件保持不变。

尝试MATCH Contact节点，查看该节点的值是否转换为int：

MATCH (c:Contact {cid: 'some_id_here', seqnum: 1} )
RETURN c

在LOAD CSV上进行Neo4j toInt转换

1 个答案: