JavaScript 驱动程序

本节介绍 Neo4j 1.7 JavaScript 驱动程序和 4.x JavaScript 驱动程序之间的重大变更。

适用于 Neo4j 的最新版 JavaScript 驱动程序可在JavaScript 驱动程序的官方页面上找到。

  • session#close() 和 driver#close() 现在返回 Promises，并且不再接受回调函数参数。

  • driver.onError 和 driver.onCompleted 回调已被移除。错误应在相关代码路径上进行监控（例如，通过 Promise#catch 等）。

查看完整变更日志：https://github.com/neo4j/neo4j-javascript-driver/wiki/4.0-changelog。

示例 1. 1.7 JavaScript 驱动程序和 4.0 JavaScript 驱动程序之间的变更示例
4.0 JavaScript 驱动程序的示例代码 1.7 JavaScript 驱动程序的示例代码 
var neo4j = require('neo4j-driver')
...
const driver = neo4j.driver(uri, neo4j.auth.basic(user, password))
...

const session = driver.session()
try {
  const tx = session.beginTransaction()
  const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' })
  const greeting = result.records[0].get(0)
  console.log(greeting)
  await tx.commit()
} finally {
  await session.close()
}
 
var neo4j = require('neo4j-driver').v1
...
const driver = neo4j.driver(uri, neo4j.auth.basic(user, password))
...

const session = driver.session()
try {
  const tx = session.beginTransaction()
  const result = await tx.run('CREATE (a:Greeting) SET a.message = $message RETURN a.message + ", from node " + id(a)', { message: 'hello, world' })
  const greeting = result.records[0].get(0)
  console.log(greeting)
  await tx.commit()
} finally {
  session.close(callback) // another session can be chained in callback
}
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