自动迁移创建数据库名称 'undefined'，在 loopback-connector-cassandra 中的 'undefined' 数据库中创建表

Question

我正在尝试使用 loopback 3 框架和 cassandra 数据库从模型自动创建 table，但在将数据源与 cassandra 连接时遇到了一些问题 datasource.json

"cassandraConn": {
"host": "192.168.4.21",
"port": 9042,
"database": "emsv2_testing",
"password": "",
"name": "cassandraConn",
"user": "",
"connectTimeout": 30000,
"readTimeout": 30000,
"connector": "cassandra"
}

型号json 文件：-

{
"name": "data_rt_raw_t1",
"plural": "data_rt_raw_t1s",
"base": "PersistedModel",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"c_id": {
"type": "string",
"required": true,
"default": null
},
"slave_id": {
"type": "string",
"required": false,
"default": null
},
"dcu_id": {
"type": "string",
"required": false,
"default": null
},
"mfm_read_time": {
"type": "date",
"required": true,
"default": null
},
"data_store_time": {
"type": "date",
"required": false,
"default": null
},
"p1": {
"type": "number",
"required": false,
"default": null
},
"p2": {
"type": "number",
"required": false,
"default": null
},
"p3": {
"type": "number",
"required": false,
"default": null
},
"p4": {
"type": "number",
"required": false,
"default": null
},
"p5": {
"type": "number",
"required": false,
"default": null
}

},
"validations": [],
"relations": {},
"acls": [],
"methods": {}
}

自动迁移创建数据库名称 'undefined'，在 'undefined' 数据库中创建 tables。尝试 post 数据出现以下错误，

{
"error": {
"statusCode": 500,
"name": "NoHostAvailableError",
"message": "Connecting after shutdown is not supported",
"info": "Represents an error when a query cannot be performed because no host is available or could be reached by the driver.",
"innerErrors": null,
"stack": "NoHostAvailableError: Connecting after shutdown is not supported\n at Client._connectCb (/home/rd/enms/node_modules/cassandra-driver/lib/client.js:397:21)\n at Client.promiseWrapper (/home/rd/enms/node_modules/cassandra-driver/lib/utils.js:410:13)\n at Client.connect (/home/rd/enms/node_modules/cassandra-driver/lib/client.js:384:31)\n at Array.utils.series.next (/home/rd/enms/node_modules/cassandra-driver/lib/client.js:854:18)\n at next

帮我解决这个问题，谢谢。

Answer 1

您发布的错误表明您的应用程序正在尝试运行在您关闭会话或与集群断开连接后进行查询。

如果您分享应用程序代码的一些相关部分，这里的贡献者将能够更好地帮助您。干杯！

自动迁移创建数据库名称 'undefined'，在 loopback-connector-cassandra 中的 'undefined' 数据库中创建表

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loopback

cassandra

node.js

cassandra-driver