小编Nic*_*oie的帖子

我正在尝试选择2列之间的值.这是我的数据集

id    from    to    price
1     0.00    2.00  2.50
2     2.00    3.00  3.00
3     3.00    4.00  4.50

我的目标,如果我的值为2,则选择ID为1的行(在from和to之间).所以这是我正在使用的查询:

select * from table where 2 between from and to;

以下是MySQL在执行此查询时返回的结果:

id    from    to    price
1     0.00    2.00  2.50
2     2.00    3.00  3.00

我正在寻找的结果如下:

id    from    to    price
1     0.00    2.00  2.50

我尝试过使用<和>等等.但是,我总是得到两个结果.任何帮助将非常感激.

使用Node.js和Express时出现以下错误.这是我的版本:

Node : v0.8.8
Express: 3.0.0rc3

尝试访问该页面时获得以下错误:

TypeError: Object #<IncomingMessage> has no method 'flash'
    at routes (/Users/nblavoie/Desktop/HotPie/HotPie/apps/authentication/routes.js:23:8)

我试图删除app.use(app.router); 从app.js没有成功.这是导致错误的代码.请参阅req.flash行.

app.post('/sessions', function(req, res)
{
    if(req.body.user == 'piechief' 
        && req.body.password == '12345')
    {
        req.session.currentUser = req.body.user;
        req.flash('info', "You're logged in as #{req.session.currentUser}");
        res.redirect("/login");
        return;
    }
    else
    {
        req.flash('error', "Those credentials were incorrect. Try again.");
        res.redirect("/login");
        return;
    }
});

这是我app.js的有趣部分:

var app = express();

app.configure(function(){
  app.set('port', process.env.PORT || 3000);
  app.set('views', __dirname + '/views');
  app.set('view engine', 'jade');
  app.use(express.favicon());
  app.use(express.logger('dev'));
  app.use(express.bodyParser());
  app.use(express.methodOverride());
  app.use(express.cookieParser());
  app.use(express.session({
    secret: …

我们将应用程序升级到Angular 5.0.0,并且在尝试运行ng serveor ng build命令时遇到两个错误:

error TS6046: Argument for '--module' option must be: 'none', 'commonjs', 'amd', 'system', 'umd', 'es6', 'es2015', 'esnext'.
error TS5024: Compiler option 'lib' requires a value of type Array.

这是tsconfig.js文件:

{
  "compileOnSave": true,
  "compilerOptions": {
    "module": "commonjs",
    "outDir": "./dist/out-tsc",
    "baseUrl": "src",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "preserveWhitespaces": false
  }
}

和package.json文件:

{
  "name": …

我面临的奇怪问题.我想在创建活动时启动服务.这是我的服务代码(很简单,你会看到):

package com.nblmedia.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;

public class ServiceSynchro extends Service {

public ServiceSynchro()
{
    Log.i(XXX.LOG, "ServiceSynchro");
}

@Override
public IBinder onBind(Intent intent) {
    Log.i(XXX.LOG, "onBind");
    // TODO Auto-generated method stub
    return null;
}

@Override
public void onCreate() {
    // TODO Auto-generated method stub
    Log.i(XXX.LOG, "onCreate");
    super.onCreate();
}

@Override
public void onDestroy() {
    Log.i(XXX.LOG, "onDestroy");
    // TODO Auto-generated method stub
    super.onDestroy();
}
}

在我的AndroidManifest.xml中,我已将服务声明如下:

<service android:name=".ServiceSynchro"></service>

最后,为了启动我的服务,我在onCreate中调用了startService方法:

protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    startService(new Intent(UserMenuActivity.this, …