3
我很难解释Neo4j关于交易的文档。他们的文件似乎表明喜欢这样做这个的方式,而不是明确声明tx.commit()
和tx.rollback()
。这是用Neo4j编写多语句事务的正确方法吗?
这是多语言交易和neo4j-driver
的最佳做法吗?
const register = async (container, user) => {
const session = driver.session()
const timestamp = Date.now()
const saltRounds = 10
const pwd = await utils.bcrypt.hash(user.password, saltRounds)
try {
//Start registration transaction
const registerUser = session.writeTransaction(async (transaction) => {
const initialCommit = await transaction
.run(`
CREATE (p:Person {
email: '${user.email}',
tel: '${user.tel}',
pwd: '${pwd}',
created: '${timestamp}'
})
RETURN p AS Person
`)
const initialResult = initialCommit.records
.map((x) => {
return {
id: x.get('Person').identity.low,
created: x.get('Person').properties.created
}
})
.shift()
//Generate serial
const data = `${initialResult.id}${initialResult.created}`
const serial = crypto.sha256(data)
const finalCommit = await transaction
.run(`
MATCH (p:Person)
WHERE p.email = '${user.email}'
SET p.serialNumber = '${serial}'
RETURN p AS Person
`)
const finalResult = finalCommit.records
.map((x) => {
return {
serialNumber: x.get('Person').properties.serialNumber,
email: x.get('Person').properties.email,
tel: x.get('Person').properties.tel
}
})
.shift()
//Merge both results for complete person data
return Object.assign({}, initialResult, finalResult)
})
//Commit or rollback transaction
return registerUser
.then((commit) => {
session.close()
return commit
})
.catch((rollback) => {
console.log(`Transaction problem: ${JSON.stringify(rollback, null, 2)}`)
throw [`reg1`]
})
} catch (error) {
session.close()
throw error
}
}
这里是逻辑的简化版本:
const register = (user) => {
const session = driver.session()
const performTransaction = session.writeTransaction(async (tx) => {
const statementOne = await tx.run(queryOne)
const resultOne = statementOne.records.map((x) => x.get('node')).slice()
// Do some work that uses data from statementOne
const statementTwo = await tx.run(queryTwo)
const resultTwo = statementTwo.records.map((x) => x.get('node')).slice()
// Do final processing
return finalResult
})
return performTransaction.then((commit) => {
session.close()
return commit
}).catch((rollback) => {
throw rollback
})
}
Neo4j的专家,是上述代码的正确使用neo4j-driver
?
我宁愿做这个,因为它更加线性和同步:
const register = (user) => {
const session = driver.session()
const tx = session.beginTransaction()
const statementOne = await tx.run(queryOne)
const resultOne = statementOne.records.map((x) => x.get('node')).slice()
// Do some work that uses data from statementOne
const statementTwo = await tx.run(queryTwo)
const resultTwo = statementTwo.records.map((x) => x.get('node')).slice()
// Do final processing
const finalResult = { obj1, ...obj2 }
let success = true
if (success) {
tx.commit()
session.close()
return finalResult
} else {
tx.rollback()
session.close()
return false
}
}
我在很长的帖子对不起,我找不到任何地方的任何引用,所以社会需要这个数据。