如何配置 spring-data-neo4j 嵌入式服务器属性

Question

我使用 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 .

我在春季@Configuration豆中尝试了这个但没有成功：

@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 配置中设置它？

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如下所示：

@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，这不适用于SDN 4.2.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版本开始3.2.1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