如何配置 spring-data-neo4j 嵌入式服务器属性？

Question

我已使用 spring-data-neo4j v 4.2.1、neo4j-ogm v 2.1.2 进行设置。
我需要具有特定配置的嵌入式 neo4j 服务器进行测试。 cypher.forbid_shortestpath_common_nodes=false.

我在 spring @Configuration bean:

中尝试过但没有成功

@Bean
public org.neo4j.ogm.config.Configuration getConfiguration() {
    org.neo4j.ogm.config.Configuration config = new org.neo4j.ogm.config.Configuration();
    config.driverConfiguration().setDriverClassName("org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver");
    config.set("cypher.forbid_shortestpath_common_nodes", false);
    return config;
}

请问，如何在 spring java 配置中进行设置？

Answer 1

cypher.forbid_shortestpath_common_nodes 是 Neo4j 设置，而不是 SDN/OGM，因此您需要在创建数据库时将其提供给数据库。

理想情况下，嵌入式数据库的配置类似于以下内容：

@Configuration
@EnableNeo4jRepositories(basePackageClasses = UserRepository.class)
@ComponentScan(basePackageClasses = UserService.class)
static class EmbeddedConfig {

    @Bean(destroyMethod = "shutdown")
    public GraphDatabaseService graphDatabaseService() {
        GraphDatabaseService graphDatabaseService = new GraphDatabaseFactory()
            .newEmbeddedDatabaseBuilder(new File("target/graph.db"))
            .setConfig(GraphDatabaseSettings.forbid_shortestpath_common_nodes, "false")
            .newGraphDatabase();

        return graphDatabaseService;
    }

    @Bean
    public SessionFactory getSessionFactory() {
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration();
        EmbeddedDriver driver = new EmbeddedDriver(graphDatabaseService());
        Components.setDriver(driver);
        return new SessionFactory(configuration, User.class.getPackage().getName());
    }

    @Bean
    public Neo4jTransactionManager transactionManager() throws Exception {
        return new Neo4jTransactionManager(getSessionFactory());
    }
}

但是这对 SDN 4 不起作用。2.x，但有一个解决方法：

    @Bean
    public SessionFactory getSessionFactory() {
        org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration();
        // Register your configuration here, this will confuse OGM so the driver you set below won't be destroyed
        Components.configure(configuration);

        // Register your driver
        EmbeddedDriver driver = new EmbeddedDriver(graphDatabaseService());
        Components.setDriver(driver);

        // Set driver class name so you won't get NPE
        configuration.driverConfiguration().setDriverClassName("org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver");

        return new SessionFactory(configuration, User.class.getPackage().getName());
    }

Answer 2

从 neo4j-ogm-embedded-driver 版本 3.2.1 开始，可以应用以下方法。

@Configuration
public class EmbeddedNeo4jConfig {

    @Bean
    org.neo4j.ogm.config.Configuration getConfiguration() {

        var builder = new org.neo4j.ogm.config.Configuration.Builder()
                .neo4jConfLocation("neo4j.conf");
        return builder.build();
    }
}

test/resources/neo4j.conf:

cypher.forbid_shortestpath_common_nodes=false

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