驱动程序配置

这是 GraphQL 库版本 7 的文档。对于长期支持 (LTS) 版本 5，请参阅GraphQL 库版本 5 LTS。

本页描述了 Neo4j GraphQL 库驱动程序的配置。

Neo4j 驱动程序

要使 Neo4j GraphQL 库正常工作，在构造 Neo4jGraphQL 实例时，必须传入一个 Neo4j JavaScript 驱动程序的实例，或者在每次请求时，将驱动程序、会话或事务传入 context.executionContext 中。

本页中的示例假设 Neo4j 数据库运行在“bolt://localhost:7687”上，用户名为“username”，密码为“password”。

Neo4j GraphQL 库

Neo4jGraphQL 构造函数中的驱动程序

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });

const server = new ApolloServer({
    schema: await neoSchema.getSchema(),
});

await startStandaloneServer(server, {
    context: async ({ req }) => ({ req }),
});

上下文中的驱动程序

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });

const server = new ApolloServer({
    schema: await neoSchema.getSchema(),
});

await startStandaloneServer(server, {
    context: async ({ req }) => ({ req, executionContext: driver }),
});

上下文中的会话

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);
const session = driver.session();

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });

const server = new ApolloServer({
    schema: await neoSchema.getSchema(),
});

await startStandaloneServer(server, {
    context: async ({ req }) => ({ req, executionContext: session }),
});

上下文中的事务

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);
const session = driver.session();
const transaction = session.beginTransaction();

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });

const server = new ApolloServer({
    schema: await neoSchema.getSchema(),
});

await startStandaloneServer(server, {
    context: async ({ req }) => ({ req, executionContext: transaction }),
});

数据库兼容性

使用 Neo4jGraphQL 实例上可用的 checkNeo4jCompat 方法，以确保指定的 DBMS 具有所需的版本，并具有必要的函数和过程。如果 DBMS 不兼容，checkNeo4jCompat 将抛出 Error，并提供不兼容的详细信息。

Neo4jGraphQL

import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });
await neoSchema.checkNeo4jCompat();

指定 Neo4j 数据库

通过所有解析器共享的 context 中 sessionConfig 下的 database 字段，指定在您的 DBMS 中使用的数据库。

import { ApolloServer } from '@apollo/server';
import { startStandaloneServer } from '@apollo/server/standalone';
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type User @node {
        name: String
    }
`;

const driver = neo4j.driver(
    "bolt://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neoSchema = new Neo4jGraphQL({ typeDefs, driver });

const server = new ApolloServer({
    schema: await neoSchema.getSchema(),
});

await startStandaloneServer(server, {
    context: async ({ req }) => ({ req, sessionConfig: { database: "my-database" }}),
});
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