Question

我正在执行以下脚本cmd.exe：

acl.js

node acl.js

buckets.js

require('dotenv').config()

const _ = require('lodash');
const buckets = require('./buckets');
const knex = require('../src/config/db'); //HERE I am getting the ERROR

var downSql = 'DROP TABLE IF EXISTS "{{prefix}}{{meta}}";'+
    'DROP TABLE IF EXISTS "{{prefix}}{{resources}}";'+
    'DROP TABLE IF EXISTS "{{prefix}}{{parents}}";'+
    'DROP TABLE IF EXISTS "{{prefix}}{{users}}";'+
    'DROP TABLE IF EXISTS "{{prefix}}{{roles}}";'+
    'DROP TABLE IF EXISTS "{{prefix}}{{permissions}}";';
var upSql = 'CREATE TABLE "{{prefix}}{{meta}}" (key TEXT NOT NULL PRIMARY KEY, value TEXT[][] NOT NULL);'+
    'INSERT INTO "{{prefix}}{{meta}}" VALUES (\'users\', \'{}\');'+
    'INSERT INTO "{{prefix}}{{meta}}" VALUES (\'roles\', \'{}\');'+
    'CREATE TABLE "{{prefix}}{{resources}}" (key TEXT NOT NULL PRIMARY KEY, value TEXT[][] NOT NULL);'+
    'CREATE TABLE "{{prefix}}{{parents}}" (key TEXT NOT NULL PRIMARY KEY, value TEXT[][] NOT NULL);'+
    'CREATE TABLE "{{prefix}}{{roles}}" (key TEXT NOT NULL PRIMARY KEY, value TEXT[][] NOT NULL);'+
    'CREATE TABLE "{{prefix}}{{users}}" (key TEXT NOT NULL PRIMARY KEY, value TEXT[][] NOT NULL);'+
    'CREATE TABLE "{{prefix}}{{permissions}}" (key TEXT NOT NULL PRIMARY KEY, value JSON NOT NULL);';

function tmpl(str, ctx) {
    var n = 1;
    var sql = str.replace(/{{(\w+)}}/g, function(match, cap1) {
        return ctx[cap1] || match;
    });
    return sql.replace(/\?/g, function() { return '$' + n++; });
}

function createTables(callback) {
    var prefix = ''
    var bucketNames = buckets(args[8])

    if (!prefix) prefix = 'acl_';

    knex.raw(tmpl(downSql+upSql, {
            'meta': bucketNames.meta,
            'parents': bucketNames.parents,
            'permissions': bucketNames.permissions,
            'prefix': prefix,
            'resources': bucketNames.resources,
            'roles': bucketNames.roles,
            'users': bucketNames.users
        }))
        .then(function() {
            if (!_.isUndefined(callback)) {
                callback(null, db);
            }
        })
    ;
}

createTables()

当我运行'use strict'; var _ = require('lodash'); var buckets = function(options){ return _.extend({ meta: 'meta', parents: 'parents', permissions: 'permissions', resources: 'resources', roles: 'roles', users: 'users' }, options); }; exports = module.exports = buckets;时，我收到以下错误：

node acl.js

错误来自> node acl.js { development: { client: undefined, connection: { user: undefined, password: undefined, database: undefined } } } undefined C:\Users\admin\Desktop\Coding Projects\learning_npm_node_acl\node_modules\knex\lib\index.js:49 if (arguments.length === 0 || !config.client && !config.dialect) { ^ TypeError: Cannot read property 'client' of undefined at Knex (C:\Users\admin\Desktop\Coding Projects\learning_npm_node_acl\node_modules\knex\lib\index.js:49:40) at Object.<anonymous> (C:\Users\admin\Desktop\Coding Projects\learning_npm_node_acl\src\config\db.js:8:29) at Module._compile (module.js:573:30) at Object.Module._extensions..js (module.js:584:10) at Module.load (module.js:507:32) at tryModuleLoad (module.js:470:12) at Function.Module._load (module.js:462:3) at Module.require (module.js:517:17) at require (internal/module.js:11:18) at Object.<anonymous> (C:\Users\admin\Desktop\Coding Projects\learning_npm_node_acl\node_acl\acl.js:5:14) at Module._compile (module.js:573:30) at Object.Module._extensions..js (module.js:584:10) at Module.load (module.js:507:32) at tryModuleLoad (module.js:470:12) at Function.Module._load (module.js:462:3) at Function.Module.runMain (module.js:609:10)文件中的const knex = require('../src/config/db');行。

我的acl.js文件如下所示：

db.js

正如您所看到的，require('dotenv').config() // Loading from an external file const config = require('../../knexfile') console.log(config) const env = process.env.DB_ENV console.log(env) const knex = require('knex')(config[env]) knex.on('query', (queryData) => { console.log(queryData) }) module.exports = knex语句在上面显示的输出中主要回复console.log。

undefined正在从knexfile.js

加载配置

knexfile.js

.env file

.ENV

require("dotenv").config()

module.exports = {

    development: {
        client: process.env.DB_CONNECTION,
        connection: {
            user: process.env.DB_USERNAME,
            password: process.env.DB_PASSWORD,
            database: process.env.DB_DATABASE,
        },
    },
}

当我运行# Database DB_CONNECTION=postgresql DB_ENV=development DB_USERNAME=root DB_PASSWORD=root DB_DATABASE=nodeacl或knex migrate:latest时，种子和迁移文件运行完美。

为什么我收到上述错误的任何建议？

Answer 1

当您运行knex migrate:latest和knex seed:run时，它会起作用，因为您的文件knexfile.js与文件系统中的文件.env位于同一级别。这意味着您的环境变量已正确导入。

您的文件acl.js是否处于同一级别？如果没有，也许您应该从node /path/to/acl.js级别运行.env。

与knex的未定义数据库连接

1 个答案: