Question

我有嵌套的对象，其中包含数据库服务器的详细信息。从嵌套对象中，我必须搜索名为“数据库”的键名，并显示其值。

我通过这样的调用找到了解决方案：

var database = (Object.entries((Object.entries(connection))[3]))[1][1].database;

但是一些时间位置正在改变。因此无法获得价值。因此，如何在嵌套对象中找到键以找到值。请帮助。预先感谢。

    console.log("connection:",  Object.entries(connection) );

结果

connection: [ [ '_events',
    [Object: null prototype] { end: [Function: _removeFromPool], error: [Function] } ],
  [ '_eventsCount', 2 ],
  [ 'config',
    ConnectionConfig {
      host: 'localhost',
      port: 336,
      localAddress: undefined,
      socketPath: undefined,
      user: 'user',
      password: 'password',
      database: 'dbname',
      connectTimeout: 10000,
      insecureAuth: false,
      supportBigNumbers: false,
      bigNumberStrings: false,
      dateStrings: false,
      debug: undefined,
      trace: true,
      stringifyObjects: false,
      timezone: 'local',
      flags: '',
      queryFormat: undefined,
      pool: [Pool],
      ssl: false,
      multipleStatements: true,
      typeCast: true,
      maxPacketSize: 0,
      charsetNumber: 33,
      clientFlags: 521167,
      protocol41: true } ],
  [ '_socket',
    Socket {
      connecting: false,
      _hadError: false,
      _handle: [TCP],
      _parent: null,
      _host: null,
      _readableState: [ReadableState],
      readable: true,
      _events: [Object],
      _eventsCount: 4,
      _maxListeners: undefined,
      _writableState: [WritableState],
      writable: true,
      allowHalfOpen: false,
      _sockname: null,
      _pendingData: null,
      _pendingEncoding: '',
      server: null,
      _server: null,
      timeout: 0,
      [Symbol(asyncId)]: 26,
      [Symbol(lastWriteQueueSize)]: 0,
      [Symbol(timeout)]:
       Timeout {
         _called: false,
         _idleTimeout: -1,
         _idlePrev: null,
         _idleNext: null,
         _idleStart: 8926,
         _onTimeout: null,
         _timerArgs: undefined,
         _repeat: null,
         _destroyed: false,
         [Symbol(unrefed)]: true,
         [Symbol(asyncId)]: 29,
         [Symbol(triggerId)]: 25 },
      [Symbol(kBytesRead)]: 0,
      [Symbol(kBytesWritten)]: 0 } ],
  [ '_protocol',
    Protocol {
      _events: [Object],
      _eventsCount: 6,
      _maxListeners: undefined,
      readable: true,
      writable: true,
      _config: [ConnectionConfig],
      _connection: [PoolConnection],
      _callback: null,
      _fatalError: null,
      _quitSequence: null,
      _handshake: true,
      _handshaked: true,
      _ended: false,
      _destroyed: false,
      _queue: [Array],
      _handshakeInitializationPacket: [HandshakeInitializationPacket],
      _parser: [Parser] } ],
  [ '_connectCalled', true ],
  [ 'state', 'authenticated' ],
  [ 'threadId', 2859 ],
  [ '_pool',
    Pool {
      _events: [Object: null prototype] {},
      _eventsCount: 0,
      _maxListeners: undefined,
      config: [PoolConfig],
      _acquiringConnections: [],
      _allConnections: [Array],
      _freeConnections: [],
      _connectionQueue: [],
      _closed: false } ] ];

以及现在正在做什么，

   var database = (Object.entries((Object.entries(connection))[3]))[1][1].database;

   console.log(database);

    output: dbname

Answer 1

要回答您的直接问题：

var db = ''
Object.entries(connection).foreach(item => {
  if (item[0] === 'config') db = item[1].database
})

但是，您应该能够直接访问该值，而无需在数组中旋转连接对象：

connection.config.database

Answer 2

let config = connection.filter(([key, value]) => key === "config")[0][1]
let database = config.database // dbname

在嵌套对象中搜索“键”并显示其值Javascript

2 个答案: