CockroachDB 与节点 js pg 驱动程序答案

【问题标题】：CockroachDB with node js pg driverCockroachDB 与节点 js pg 驱动程序
【发布时间】：2020-12-11 09:19:10
【问题描述】：

我正在尝试使用 pg 驱动程序连接 CockroachDB 和 Nodes JS。我能够成功建立连接，但是每次查询表时：它仅在我为表名加上数据库名称前缀时才有效，否则它会引发关系不存在错误。虽然我在建立数据库连接时指定了数据库名称。

我用来建立数据库连接的代码：

    var pg = require('pg');
    var config = {
        user: 'root',
        host: 'localhost',
        database: 'testDB',
        port: 26257
    };
    var pool = new pg.Pool(config);   
    const client = await pool.connect();

执行此行工作正常，因为我在表名前加上 DBname：

const response = await client.query('select * from testDB.test');

执行此行会引发以下错误：

const response = await client.query('select * from test');

(node:12797) UnhandledPromiseRejectionWarning: error: relation "test" does not exist
    at Parser.parseErrorMessage (/Users/naveenkumar/Ucars/node-cockroachDB/node_modules/pg-protocol/dist/parser.js:278:15)
    at Parser.handlePacket (/Users/naveenkumar/Ucars/node-cockroachDB/node_modules/pg-protocol/dist/parser.js:126:29)
    at Parser.parse (/Users/naveenkumar/Ucars/node-cockroachDB/node_modules/pg-protocol/dist/parser.js:39:38)
    at Socket.<anonymous> (/Users/naveenkumar/Ucars/node-cockroachDB/node_modules/pg-protocol/dist/index.js:10:42)
    at Socket.emit (events.js:314:20)
    at addChunk (_stream_readable.js:304:12)
    at readableAddChunk (_stream_readable.js:280:9)
    at Socket.Readable.push (_stream_readable.js:219:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:188:23)
    at TCP.callbackTrampoline (internal/async_hooks.js:123:14)
(Use `node --trace-warnings ...` to show where the warning was created)
<node_internals>/internal/process/warning.js:33
(node:12797) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
<node_internals>/internal/process/warning.js:33
(node:12797) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

感谢任何形式的帮助，在此先感谢 :)

【问题讨论】：

标签： node.js orm pg cockroachdb

【解决方案1】：

编辑：数据库名称应全部小写。见https://www.cockroachlabs.com/docs/stable/keywords-and-identifiers.html#rules-for-identifiers

defaultdb> CREATE DATABASE TeSt;
CREATE DATABASE

Time: 166.382ms

defaultdb> SHOW DATABASES;
        database_name        |       owner
-----------------------------+---------------------
  defaultdb                  | root
  test                       | lauren
  testdb                     | lauren

使用 CockroachDB v20.2.2 和 pg v8.5.1，我无法重现该问题。以下按预期工作：

const { Pool } = require("pg");

const config = {
  ...
  database: "testdb",
  ...
};

const pool = new Pool(config);
;(async function() {
  const client = await pool.connect();
  await client.query("select * from test_table", (err, res) => {
    console.log(err, res);
    client.end();
  });
})()

【讨论】：

谢谢！！，它成功了，数据库名称中的大写是问题。