Question

我试图链接读取和更新操作。首先，我根据 id 从数据库中读取（获取）数据，然后我更改它并希望更新数据库中的数据，但我收到Unhandled rejection Error: There is no pool defined on the current client错误。

index.js

var id = args.id;
var proj = new Project(id);

proj.read(knex).then(function(rows) {
  proj.set(args);
  proj.update(knex).then(console.log); // <== ERROR THROWN HERE
});

Project.js （仅限相关功能）

read(knex) {
  var self = this;

  return knex('projects').where('id', this.id).then(function(rows) {
    if (rows.length == 0)
      throw '[panda] Read project: no project with id = ' + self.id;
    self.set(rows[0]);

    return self;
  });
}

update(knex) {
  console.log(knex('projects').where('id', this.id).update(this).toString());

  return knex('projects').where('id', this.id).update(this);
}

命令

$ node index.js projects update --id=5 --name=Test-update
update "projects" set "completion" = 0, "currentIteration" = NULL, "id" = 5, "name" = 'Test-update' where "id" = 5
Unhandled rejection Error: There is no pool defined on the current client
    at /home/flawyte/development/projects/js/panda/node_modules/knex/lib/client.js:202:25
    at tryCatcher (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/util.js:26:23)
    at Promise._resolveFromResolver (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/promise.js:480:31)
    at new Promise (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/promise.js:70:37)
    at Client.acquireConnection (/home/flawyte/development/projects/js/panda/node_modules/knex/lib/client.js:200:12)
    at /home/flawyte/development/projects/js/panda/node_modules/knex/lib/runner.js:136:49
    at tryCatcher (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/util.js:26:23)
    at Function.Promise.attempt.Promise.try (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/method.js:31:24)
    at Runner.ensureConnection (/home/flawyte/development/projects/js/panda/node_modules/knex/lib/runner.js:135:26)
    at Runner.run (/home/flawyte/development/projects/js/panda/node_modules/knex/lib/runner.js:30:31)
    at QueryBuilder.Target.then (/home/flawyte/development/projects/js/panda/node_modules/knex/lib/interface.js:27:43)
    at /home/flawyte/development/projects/js/panda/index.js:80:31
    at tryCatcher (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/util.js:26:23)
    at Promise._settlePromiseFromHandler (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/promise.js:507:31)
    at Promise._settlePromiseAt (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/promise.js:581:18)
    at Promise._settlePromises (/home/flawyte/development/projects/js/panda/node_modules/bluebird/js/main/promise.js:697:14)

如果我删除 index.js中的then(console.log) ，则不会抛出任何错误，但数据库中的数据在脚本结束后仍保持不变。为什么？

Answer 1

我的脚本末尾有一行knex.destroy();，而且knex是异步的，在<{strong> read()指令之后执行该行（由于快速执行））但之前 update()，导致上述错误。

<强> Project.js

var done = false; proj.read(knex).then(function(rows) { proj.set(args); proj.update(knex).then(function(res) { done = true; console.log(res); knex.destroy(); }); }); // ... if (!done) // End database connection here // in case an error prevented it from being destroyed after update // which would in turn prevent the script from ending knex.destroy();

knex.js - 读取然后更新会抛出错误

1 个答案: