Node.js 使用postgres进行续集默认为mysql

我正在设置Sequelize，以便在Node.js应用程序中管理postgres

我需要sequelize postgres，以及在实例化新sequelize对象时用方言attr声明的'postgres'。但出于某种原因，它默认使用mysql

确切错误消息：

/Users/...project/node_modules/sequelize/lib/dialects/mysql/connector-manager.js:306
    var connection = mysql.createConnection(connectionConfig);
                           ^
TypeError: Cannot call method 'createConnection' of undefined
    at module.exports.connect (.../node_modules/sequelize/lib/dialects/mysql/connector-manager.js:306:28)
    at Object.pool.Pooling.Pool.create 

(.../node_modules/sequelize/lib/dialects/mysql/connector-manager.js:131:19)
    at createResource (.../node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:258:13)
    at dispense (.../node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:250:9)
    at Object.me.acquire (.../node_modules/sequelize/node_modules/generic-pool/lib/generic-pool.js:316:5)
    at null.fct (.../node_modules/sequelize/lib/dialects/mysql/connector-manager.js:241:19)
    at null.<anonymous> (.../node_modules/sequelize/lib/emitters/custom-event-emitter.js:24:18)
    at processImmediate [as _immediateCallback] (timers.js:336:15)

/Users/…project/node_modules/sequelize/lib/dialogs/mysql/connector manager.js:306
var connection=mysql.createConnection（connectionConfig）；
^
TypeError:无法调用未定义的方法“createConnection”
在module.exports.connect（…/node_modules/sequelize/lib/dialogs/mysql/connector manager.js:306:28）
在Object.pool.Pooling.pool.create
（…/node_modules/sequelize/lib/dialogs/mysql/connector manager.js:131:19）
在createResource（…/node_modules/sequelize/node_modules/generic pool/lib/generic pool.js:258:13）
分发时（…/node_modules/sequelize/node_modules/generic pool/lib/generic pool.js:250:9）
在Object.me.acquire（…/node_modules/sequelize/node_modules/generic pool/lib/generic pool.js:316:5）
在null.fct（…/node_modules/sequelize/lib/dialogs/mysql/connector manager.js:241:19）
在空。（…/node_modules/sequelize/lib/emitters/custom event emitter.js:24:18）
在processImmediate[as_immediateCallback]（timers.js:336:15）

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感谢您的帮助，谢谢

尝试使用“pg”而不是“postgres”作为方言attr的值？那对我不起作用。好的建议=]你能发布你的应用程序的配置代码吗？特别是config/connections.js、config/env/development.js和config/env/production.js。谢谢你，但我已经搞定了！愚蠢的错误。使用postgres sequelize=new sequelize（'dbname'，'username'，'pw'，{方言：'postgres'，sync:{force:true}，syncOnAssociation:true，pool:{maxConnections:5，maxIdleTime:30}），谢谢，@NicoleZhu。你在哪里找到的信息？