如何将环回框架应用程序连接到预先存在的/数据填充的MySQL数据库/数据源?
此问题特别适用于来自StrongLoop(由IBM拥有/支持)。据我所知,这应该是一个两步的过程如何将环回框架应用程序连接到预先存在的/数据填充的MySQL数据库/数据源?,mysql,node.js,loopbackjs,loopback,Mysql,Node.js,Loopbackjs,Loopback,此问题特别适用于来自StrongLoop(由IBM拥有/支持)。据我所知,这应该是一个两步的过程 编写一个脚本,从现有的MySQL模式中发现/创建模型。以下是与此相关的官方文件: 我认为我使用以下NPM包成功地处理了发现/模型创建部分:(GitHub repo for project可在此处找到:) 使用自动更新(通过loopback project/server/boot目录中的脚本)进行检查,以确保MySQL DB符合发现/创建模块创建的模型定义。下面是一个StackOverflow主题,介
{
"error": {
"statusCode": 500,
"name": "Error",
"message": "ER_NO_SUCH_TABLE: Table 'my_mysqlDB.Posts' doesn't exist",
"code": "ER_NO_SUCH_TABLE",
"errno": 1146,
"sqlState": "42S02",
"index": 0,
"stack": "Error: ER_NO_SUCH_TABLE: Table 'my_mysqlDB.Posts' doesn't exist\n at Query.Sequence._packetToError (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/sequences/Sequence.js:52:14)\n at Query.ErrorPacket (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/sequences/Query.js:77:18)\n at Protocol._parsePacket (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Protocol.js:280:23)\n at Parser.write (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Parser.js:75:12)\n at Protocol.write (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Protocol.js:39:16)\n at Socket.<anonymous> (/app/AvailableTripsLBcode/node_modules/mysql/lib/Connection.js:103:28)\n at emitOne (events.js:96:13)\n at Socket.emit (events.js:188:7)\n at readableAddChunk (_stream_readable.js:176:18)\n at Socket.Readable.push (_stream_readable.js:134:10)\n at TCP.onread (net.js:551:20)\n --------------------\n at Protocol._enqueue (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Protocol.js:141:48)\n at PoolConnection.query (/app/AvailableTripsLBcode/node_modules/mysql/lib/Connection.js:208:25)\n at runQuery (/app/AvailableTripsLBcode/node_modules/loopback-connector-mysql/lib/mysql.js:186:16)\n at executeWithConnection (/app/AvailableTripsLBcode/node_modules/loopback-connector-mysql/lib/mysql.js:228:7)\n at Ping.onOperationComplete [as _callback] (/app/AvailableTripsLBcode/node_modules/mysql/lib/Pool.js:110:5)\n at Ping.Sequence.end (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/sequences/Sequence.js:86:24)\n at Ping.Sequence.OkPacket (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/sequences/Sequence.js:95:8)\n at Protocol._parsePacket (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Protocol.js:280:23)\n at Parser.write (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Parser.js:75:12)\n at Protocol.write (/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/Protocol.js:39:16)\n at Socket.<anonymous> (/app/AvailableTripsLBcode/node_modules/mysql/lib/Connection.js:103:28)\n at emitOne (events.js:96:13)\n at Socket.emit (events.js:188:7)\n at readableAddChunk (_stream_readable.js:176:18)\n at Socket.Readable.push (_stream_readable.js:134:10)\n at TCP.onread (net.js:551:20)"
}
}
{
“错误”:{
“状态代码”:500,
“名称”:“错误”,
“消息”:“没有这样的表:表'my_mysqlDB.Posts'不存在”,
“代码”:“没有这样的表格”,
“errno”:1146,
“sqlState”:“42S02”,
“索引”:0,
“stack”:“Error:ER\u NO\u此类\u TABLE:TABLE'my\u mysqlDB.Posts'在Query.Sequence不存在。\n packetToError(/app/AvailableTripsLBcode/node\modules/mysql/lib/protocol/sequences/Sequence.js:52:14)\n在Query.ErrorPacket(/app/AvailableTripsLBcode/node\modules/mysql/lib/protocol/sequences/Query.js:77:18)\n在protocol.\parsePacket(/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/protocol/protocol.js:280:23)\n在Parser.write(/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/protocol.js:39:16)\n在套接字。(/app/AvailableTripsLBcode/node\u modules/mysql/lib/Connection.js:103:28)\n在emitOne(events.js:96:13)\n在Socket.emit(events.js:188:7)\n在readableAddChunk(\u stream\u readable.js:176:18)\n在Socket.readable.push(\u stream\u readable.js:134:10)\n在TCP.onread(net.js:551:20)\n在Protocol.\n(/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/protocol.js:141:48)\n在PoolConnection.query(/app/AvailableTripsLBcode/node_modules/mysql/lib/Connection.js:208:25)\n在runQuery(/app/AvailableTripsLBcode/node_modules/loopback connector mysql/lib/mysql.js:186:16)\n在executeWithConnection(/app/AvailableTripsLBcode/node_modules/loopback connector mysql/lib/mysql.js:228:7)\n在Ping.onOperationComplete[as_callback](/app/AvailableTripsLBcode/node_modules/mysql/lib/Pool.js:110:5)\n在Ping.Sequence.end(/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/sequences/sequences/sequences/sequences.js:86:24)\n(/app/AvailableTripsLBcode/node\u modules/mysql/lib/protocol/sequences/Sequence.js:95:8)\n在protocol.write(/app/AvailableTripsLBcode/node\modules/node\modules/mysql/lib/protocol/Parser.js:75:12)\n在protocol.write(/app/AvailableTripsLBcode/node_modules/mysql/lib/protocol/protocol.js:39:16)\n位于套接字。(/app/AvailableTripsLBcode/node_modules/mysql/lib/Connection.js:103:28)\n位于emitOne(events.js:96:13)\n位于Socket.emit(events.js:188:7)\n位于readableAddChunk(\u stream\u readable.js:176:18)\n位于Socket.readable.push(\u stream\u readable.js:134:10)\n位于TCP.onread(net.js:551:20)”
}
}
我只关心DB(posts)上的一个表,我只需要读不写。我不确定我是否需要所有其他模型的模型在common/models目录中,或者我是否只能在数据源上拥有与我的“posts”表相关的我的posts模型,为此,我尝试了两种方法,但都没有成功
我觉得LoopBack是如何处理基于模型的模式创建的,我缺少了一些东西,但到目前为止,我还没有解决它的任何运气
其他一些说明/细节
如果您的模型名为
“Post”
,则环回将在mysql
中查找Post
表
"name": "Post",
"options": {
"idInjection": false,
"mysql": {
"schema": "LOOPBACK",
"table": "post"
}
}
将其添加到post.json文件中,它将工作是名为“post”的模型?对应的表名是什么?@itssajan Model name是Post,table name是Post。在您发表评论并在GitHub上看到问题后,我使用以下标志/环境变量输出由LoopBack生成的SQL查询,以查看是否有任何线索,为此我运行了:export DEBUG=LoopBack:connector:mysql这很有帮助,因为它表明,无论出于何种原因,即使在common/models/posts.js中将表设置为“posts”,生成的SQL查询也会使用