英文:
Invalid input F
问题
我正在4.1版本中运行以下Cypher查询，但是我无法理解为什么它会产生错误消息“无效输入'F'：预期空格、注释、IF或ON”对于查询CREATE CONSTRAINT n_tester FOR (n:Test) REQUIRE n.Tester IS UNIQUE。
Cypher查询是否必须分行？我添加了一些\n，但仍然出错了 - 不过这可能是php的json_encode做了一些奇怪的事情。这个查询的格式有什么问题？
英文:
I am running the following Cypher query in 4.1 and cannot see for the life of me why it is producing the error Invalid input 'F': expected whitespace, comment, IF or ON for the query CREATE CONSTRAINT n_tester FOR (n:Test) REQUIRE n.Tester IS UNIQUE.
Do Cypher queries have to be line separated? I added a couple of \n and it still errored - however that could well be php's json_encode doing something odd. What is wrong with the format of this query?
答案1
得分: 1
版本之间的语法有所变化。对于4.3版本：
CREATE CONSTRAINT n_tester ON (n:Test) ASSERT n.Tester IS UNIQUE
对于4.1版本，文档甚至没有显示约束条件，所以可能在那个版本中不可用。
https://neo4j.com/docs/cypher-manual/4.3/constraints/syntax/
英文:
The syntax changes between versions. For 4.3:
CREATE CONSTRAINT n_tester ON (n:Test) ASSERT n.Tester IS UNIQUE
For 4.1, the documentation doesn't even show constraints, so maybe that's not even available for that version.
https://neo4j.com/docs/cypher-manual/4.3/constraints/syntax/
答案2
得分: 1
注意：Neo4j 4.1 已经在一段时间前达到了生命周期终点，请升级！
一般来说，你可以在这里找到旧版本的文档。
对于 4.1 版本，约束创建语法（根据你的示例进行了调整）如下所示：
CREATE CONSTRAINT n_tester ON (n:Test) ASSERT n.Tester IS UNIQUE
英文:
Note: Neo4j 4.1 has reached End Of Life a while ago, please upgrade!
Generally speaking, you can find documentation for older versions here.
For 4.1, the constraint creation syntax (adapted to your example) is as follows:
CREATE CONSTRAINT n_tester ON (n:Test) ASSERT n.Tester IS UNIQUE
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