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我正在處理一個代表數據庫模塊的簡單Coffescript類(使用帶有jugglingdb的SQLite,它工作正常),它有一個返回總是false的方法,我找不到爲什麼即:Coffeescript類的方法總是返回false
database.coffee
Schema = require('jugglingdb').Schema;
module.exports = class Database
constructor: (database_file) ->
if database_file?
@filename = database_file
else
@filename = 'board.db'
console.log '[DB] SQLite database: ' + @filename
@db = null
@connection = false
connect: (callback) ->
@db = new Schema 'sqlite3', { database: @filename }
@db.on 'connected',() ->
console.log '[DB] Database connection established'
@connection = true
callback? callback(@connection)
@db.on 'disconnected',()->
console.log '[DB] Database closed'
@connection = false
callback? callback(@connection)
@db.log = (message, duration)-> console.log '[DB]' + message
close: ->
@db.disconnect()
delete @db
@db = null
getSchema: ->
if @db isnt null
return @db
else
return null
isConnected: ->
return @connection
數據庫test.js
var Database = require('./database');
function db_connection_cb(is_connected)
{
var connection = db.isConnected();
console.log("Class method: " + connection + " --- from callback: " + is_connected);
}
var db = new Database('user_test.db');
db.connect(db_connection_cb);
令人驚訝的是,db.isConnected()報告始終爲false,但is_connected始終爲真。 爲什麼Node.js有這樣一個奇怪的行爲?
奏效!謝謝 – madduci 2014-08-29 09:44:05