Javascript 变量isConnected未更改
isConnected应该是一个变量,用于测试数据库连接是否成功。现在在我的DatabaseTest类中,我想断言这个isConnected变量。isConnected在数据库对象中声明,因此应该可以通过database.isConnected访问它。但是makeConnection()和closeConnection()中的值没有更改。我怀疑这是因为isConnected不是全局变量。而且,当我在var mysql行之后将其声明为var isConnected时,它也不会更新它。 我是否缺少一些基本的范围基础知识Javascript 变量isConnected未更改,javascript,mysql,scope,mocha.js,chai,Javascript,Mysql,Scope,Mocha.js,Chai,isConnected应该是一个变量,用于测试数据库连接是否成功。现在在我的DatabaseTest类中,我想断言这个isConnected变量。isConnected在数据库对象中声明,因此应该可以通过database.isConnected访问它。但是makeConnection()和closeConnection()中的值没有更改。我怀疑这是因为isConnected不是全局变量。而且,当我在var mysql行之后将其声明为var isConnected时,它也不会更新它。 我是否缺少一
var mysql = require('mysql');
//Database
var database = {
isConnected: false,
makeConnection: function(){
var connectionString = {
host: '192.168.1.3',
port: 3306,
user: 'root',
password: 'secret',
database: 'user_profile_database'
};
var activeConnection = mysql.createConnection(connectionString);
activeConnection.connect(function(error){
if(error){
throw error;
}
console.log("Successfull connection!");
});
isConnected = true;
return activeConnection;
},
closeConnection: function(activeConnection){
activeConnection.end(function(error){
if(error){
throw error;
}
console.log("Successfull disconnetion!");
});
isConnected = false;
}
}
module.exports = database;
这就是测试用例:
var database = require('../Code/Database/Database');
var expect = require('chai').expect;
//Tests for the Database class.
describe("#Database", function(){
//Test for the makeConnection method
describe("#makeConnection", function(){
it("should make a connection with the database", function(){
expect(database.isConnected).to.be.false;
var connection = database.makeConnection();
expect(database.isConnected).to.be.true;
})
})
})
在
makeConnetion()
和closeConnection()
方法中,应将isConnected
称为this.isConnected
例如:
var mysql = require('mysql');
//Database
var database = {
isConnected: false,
makeConnection: function(){
var connectionString = {
host: '192.168.1.3',
port: 3306,
user: 'root',
password: 'secret',
database: 'user_profile_database'
};
var activeConnection = mysql.createConnection(connectionString);
activeConnection.connect(function(error){
if(error){
throw error;
}
console.log("Successfull connection!");
});
this.isConnected = true; // instead of just isConnected
return activeConnection;
},
closeConnection: function(activeConnection){
activeConnection.end(function(error){
if(error){
throw error;
}
console.log("Successfull disconnetion!");
});
this.isConnected = false; // instead of just isConnected
}
}
module.exports = database;
isConnected
是对象的属性。你必须通过对对象的引用来引用该属性。我怎么会忽略这一点?我记得我试过这个,但可能也出了什么问题。谢谢!