如何在Neo4j密码查询中将变量放入存储库

Question

I am using spring neo4j. I have a repository class that extends GraphRepository<T> . I want to delete a specific object based on the uid in the arguments to the method below.

public interface TypeRepository extends GraphRepository<Type> {

    @Query("START n=node:node_auto_index(uid=uidValueYAA)" +
                "MATCH n-[r]-()" +
                "DELETE n, r")
    public void deleteByUid(String uidValueYAA);
}

Note: my persisted class has an index annotation like the following:

@GraphId
private Long id;
@Indexed(unique=true) private String uid;

I get the following exception when I use the method like so:

typeRepository.deleteByUid(uid);

//The Exception
string literal or parameter expected|"START n=node:node_auto_index(uid=uidValueYAA)MATCH n-[r]-()DELETE n, r"|     

How can I use the method to delete a specific node based on the uid that I pass to the method?

Answer 1

Or

    @Query("START n=node:node_auto_index(uid={uidValueYAA})" +
                "MATCH n-[r]-()" +
                "DELETE n, r")
    public void deleteByUid(@Param("uidValueYAA") String uidValueYAA);

Answer 2

You need to use {0} instead of the name as shown below

@Query("START n=node:node_auto_index(uid={0})" +
                "MATCH n-[r]-()" +
                "DELETE n, r")
public void deleteByUid(String uidValueYAA);