Question

我正在尝试将Node.js应用程序与PostgreSQL服务器连接。似乎无论我使用什么，我最终都会遇到同样的错误：

bundle.js:16177 ERROR: TypeError: net.Stream is not a constructor
at new Connection (bundle.js:10133)
at new Client (bundle.js:9704)
at Object.create (bundle.js:11308)
at Pool._createResource (bundle.js:510)
at Pool.dispense [as _dispense] (bundle.js:498)
at Pool.acquire (bundle.js:573)
at Pool.pool.connect (bundle.js:11359)
at PG.connect (bundle.js:10876)
at bundle.js:1642

起初我在文档here中声明了new pg.Client()示例，但是根据this堆栈溢出帖子发现上面发现的错误可能是一个坏主意。< / p>

我尝试使用pg.connect()：

var pg = require('pg'); //postgresql dependency
var connectionString = "postgres://postgres:thisissuchagoodpassword@PostgreSQL/localhost:5432/Milestone1DB"

console.log("Initiating...");
//var connectionString = "postgres://postgres:thisissuchagoodpassword@PostgreSQL9.6/localhost:5432/Milestone1DB";
//var client = new pg.Client();

//connect to the database
console.log("Attempting to connect to the database");
pg.connect(function (err, client, done)
{
  if(err)
  {
    console.log("Error connecting to the database.");
     throw err;
  }

  client.query("SELECT DISTINCT state FROM business ORDER BY state", function (err, result)
  {
   if(err)
    {
      console.log("Query resulted in an error.");
      throw err;
    }

    console.log(result.rows[0]);

    client.end(function (err)
    {
      if(err)
      {
        console.log("Error disconnecting from the databse.");
        throw err;
      }
    });
  });
});

以下是我尝试过的pg-promise代码：

var pgp = require('pg-promise');

var cn = {
    host: 'localhost', // server name or IP address;
    port: 5432,
    database: 'Milestone1DB',
    user: 'postgres',
    password: 'thisissuchagoodpassword'
};

var db = pgp(cn); // database instance;

db.any("select distict state from business order by state;")
    .then(data => {
        console.log("DATA:", data);
    })
    .catch(error => {
        console.log("ERROR:", error);
    });

我一定错过了什么，但我不知道在哪里看。感谢能够帮助我弄清楚这个错误意味着什么的任何人。

Answer 1

确保您没有跨越破坏网络原型链的上下文边界并剥离Stream（）等方法。我遇到了类似的未处理的Promise异常，节点7.5和pg-live-select。然而，由于网络参考的传递方式，它是间歇性的。我最终使用了V8检查器，并安装了一个调试器＆＃39;直接在connection.js第13行的上方声明以捕获损坏。

node_modules/lib/connection.js:13
  this.stream = config.stream || new net.Stream();
                                 ^

TypeError: net.Stream is not a constructor
    at new Connection (node_modules/pg-live-select/node_modules/pg/lib/connection.js:13:34)
    at new Client (node_modules/pg-live-select/node_modules/pg/lib/client.js:26:37)
    at Object.create (node_modules/pg-live-select/node_modules/pg/lib/pool.js:27:24)
    at Pool._createResource (node_modules/generic-pool/lib/generic-pool.js:325:17)
    at Pool.dispense [as _dispense] (node_modules/generic-pool/lib/generic-pool.js:313:12)
    at Pool.acquire (node_modules/generic-pool/lib/generic-pool.js:388:8)
    at Pool.pool.connect (node_modules/pg-live-select/node_modules/pg/lib/pool.js:78:14)
    at PG.connect (node_modules/pg-live-select/node_modules/pg/lib/index.js:49:8)
    at LivePg._updateQuery (node_modules/pg-live-select/index.js:295:6)
    at node_modules/pg-live-select/index.js:160:14
    at Array.forEach (native)
    at Timeout.performNextUpdate [as _onTimeout] (node_modules/pg-live-select/index.js:159:23)
    at ontimeout (timers.js:365:14)
    at tryOnTimeout (timers.js:237:5)
    at Timer.listOnTimeout (timers.js:207:5)

net.Stream不是构造函数 - Node Postgres

1 个答案: