orientdb 和 waterline 中的事务 [英] Transaction in orientdb and waterline

问题描述

我正在尝试在 waterline 中创建事务，但我从 OrientDB 收到此错误:

I am trying to to create transaction in waterline but I am getting this error from OrientDB:

com.orientechnologies.orient.core.command.OCommandExecutorNotFoundException: Cannot find a command executor for the command request: sql.BEGIN

这是我的代码:

 try {
  itemsModel.query("BEGIN", function(err) { if (err) {throw new Error(err);}
    itemsModel.update({id:items_ids,status:ACTIVE},{status:INACTIVE})
      .exec(function(err, INA_items){ if (err) {throw new Error(err);}
        if (INA_items.length != items_ids.length ) {throw new Error({err:RECORD_NOT_FOUND});}
        itemsModel.query("COMMIT", function(err) { if (err) {throw new Error({err:MSG.RECORD_NOT_FOUND,title:"ITEMS"});} });
      });
  });
}
catch(e){
  itemsModel.query("ROLLBACK", function(err) { 
    if (err) {return res.serverError(err);}
    return res.serverError(e);  
  });
}

我也直接在orientdb中检查了BEGIN命令，但同样的错误.

I also checked BEGIN command directly in orientdb, but same error.

推荐答案

目前的问题是混合了几个不同的概念，我将尝试一一解决:

The question as it stands is mixing several different concepts, I'll try to address one by one:

1. Waterline 的 API 本身不支持事务(检查 issue #755);

看起来您正在使用 sails-orientdb 适配器，并从中执行一个 raw SQL 查询；

It looks like you are using sails-orientdb adapter and from it you are executing a raw SQL query;

您在示例的第二行中执行的 SQL 查询只是 BEGIN，这就是 OrientDB 本身抛出错误的地方.事务 SQL 查询必须类似于:

The SQL query you are executing in the second line of your example is just BEGIN and that's where OrientDB itself is throwing an error. A transaction SQL query must be something like:

begin
let account = create vertex Account set name = 'Luke'
let city = select from City where name = 'London'
let edge = create edge Lives from $account to $city
commit retry 100
return $edge

示例取自 OrientDB 文档.

或者，您可以通过使用 javascript 风格 使用事务>Oriento 数据库对象.假设您使用的是 sails-orientdb，您可以像这样获得 Oriento DB 对象:

Alternatively you can use transactions in a more javascript style by making use of the Oriento DB object. Assuming you are using sails-orientdb you can get the Oriento DB object like this:

var db = itemsModel.getDB();

// using oriento syntax, you can do something like
var tx = db.begin();
tx.create({
  '@class': 'TestClass',
  name: 'item3'
});
return tx.commit()
.then(function (results) {
  console.log(results.created.length);  // should be 1
});

示例取自 Oriento 测试.另一个很好的例子可以在 Oriento 的示例文件夹中找到.>

Example taken from Oriento tests. Another good example can be found at Oriento's example folder.

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