小编arp*_*pho的帖子

我需要使用sqlalchemy在mysql中创建一个db,如果它已经存在,我可以连接到db,但是我希望能够创建它,如果它不存在的话.这是我的表:

    #def __init__(self):
Base = declarative_base()

class utente(Base):
    __tablename__="utente"
    utente_id=Column(Integer,primary_key=True)
    nome_utente=Column(Unicode(20))
    ruolo=Column(String(10))
    MetaData.create_all()

    def __repr(self):
        return "utente: {0}, {1}, id: {2}".format(self.ruolo,self.nome_utente,self.utente_id)


class dbmmas(Base):

    __tablename__="dbmmas"
    db_id=Column(Integer,primary_key=True,autoincrement=True)
    nome_db=Column(String(10))
    censimento=Column(Integer)
    versione=Column(Integer)
    ins_data=Column(DateTime)
    mod_data=Column(DateTime)
    ins_utente=Column(Integer)
    mod_utente=Column(Integer)
    MetaData.create_all()

    def __repr(self):
        return "dbmmas: {0}, censimento {1}, versione {2}".format(self.nome_db,self.censimento,self.versione)    

class funzione(Base):
    __tablename__="funzione"
    funzione_id=Column(Integer,primary_key=True,autoincrement=True)
    categoria=Column(String(10))
    nome=Column(String(20))
    def __repr__(self):
        return "funzione:{0},categoria:{1},id:{2} ".format(self.nome,self.categoria,self.funzione_id)

class profilo(Base):
    __tablename__="rel_utente_funzione" 
    utente_id=Column(Integer,primary_key=True)
    funzione_id=Column(Integer,primary_key=True)
    amministratore=Column(Integer)
    MetaData.create_all()

    def __repr(self):
        l=lambda x: "amministratore" if x==1 else "generico"
        return "profilo per utente_id:{0}, tipo: {1}, funzione_id: {2}".format(self.utente_id,l(self.amministratore),self.funzione_id)    

class aree(Base):
    __tablename__="rel_utente_zona" …

我是haskell的新手,我必须编写一个程序上下文感知,所以我认为我可以使用Reader Monad来保持从文件中读取上下文,我知道如何读取文件将内容放在像tuplessomething这样的列表中[([Char],[Char])],但我不知道如何实现Reader Monad使环境可用于我的程序的所有组件而不使用命令式样式,特别是我不知道如何设置和使用环境,据我所知,我应该将它作为参数提供给需要环境的所有函数使用runReader函数env,但我很困惑,有人可以给我一些指示或一个很好的教程吗？提前致谢

我需要检查Protractor是否启用了我的角度应用程序中的按钮,因此这是我的测试:

    it('submit should not be enabled',function() {
      var price = by.name('price'),
          oldCategory = by.name('oldCategory'),
          newCategory = by.name('newCategory'),
          oldPayment = by.name('oldPayment'),
          newPayment = by.name('newPayment'),
          item = by.name('item'),
          submit = by.id('submitButton');
      expect(submit.isEnabled().toBe(false)); 
  });

当我运行测试时,得到此错误:

 TypeError: Object By.name("price") has no method 'isEnabled'

在我的角度应用程序中，如果用户未登录，我会重定向到登录页面，它可以工作，但是使用 jasmine 和 karma 的测试失败并出现以下错误：Invalid provider for the NgModule 'DynamicTestModule' - only instances of Provider and Type are allowed, got: [..., ...,?[object Object]?]

这是我的规格文件：

import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';\n  import { TestBed, waitForAsync } from '@angular/core/testing';\n\n  import { RouterTestingModule } from '@angular/router/testing';\n\n  import { AppComponent } from './app.component';\n  import { LoginPage } from './modules/user/pages/login/login.page';\n\n  describe('AppComponent', () => {\n\n\n    beforeEach(waitForAsync(() => {\n\n      TestBed.configureTestingModule({\n        declarations: [AppComponent],\n        schemas: [CUSTOM_ELEMENTS_SCHEMA],\n        imports:[RouterTestingModule],\n        providers:[RouterTestingModule.withRoutes([{path:"users/login",component:LoginPage}])]\n      }).compileComponents();\n    }));\n\n    it('should create the app', waitForAsync(() => …

建议我使用attoparsec来解析文件,现在我必须要了解如何使用它; 有人给了我这段代码:

#

type Environment = M.Map String String 
import Data.Attoparsec (maybeResult)
import qualified Data.Attoparsec.Char8 as A
import qualified Data.ByteString.Char8 as B
environment :: A.Parser Environment
environment = M.fromList <$> A.sepBy entry A.endOfLine
parseEnvironment = maybeResult .flip A.feed B.empty . A.parse environment
spaces = A.many $ A.char ' '
entry = (,) <$> upTo ':' <*> upTo ';'
upTo delimiter = B.unpack <$> A.takeWhile (A.notInClass $ delimiter : " ")
                      <* (spaces >> A.char delimiter >> spaces)

效果很好,但我不知道为什么:使用翻转的原因是什么,将A.feed的参数置于不同的顺序并不容易？为什么有B.empty？有一些关于我可以学习的教程吗？提前致谢

Ext JS是否支持国际化

您好，有没有办法用 mongoose 切换数据库？我想我可以这样做：

mongoose.disconnect();
mongoose.connect('localhost',db);

但它不起作用我收到此错误：

Error: Trying to open unclosed connection.

不知道是不是因为是异步的

我需要将Spring安全性与使用spring 3.1.1构建的小应用程序集成,遵循本教程3.2.1节,获得此错误跟踪:

gen 31, 2014 3:08:41 PM org.apache.catalina.core.StandardContext filterStart
Grave: Exception starting filter springSecurityFilterChain
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'springSecurityFilterChain' is defined
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:529)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:277)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1097)
    at org.springframework.web.filter.DelegatingFilterProxy.initDelegate(DelegatingFilterProxy.java:326)
    at org.springframework.web.filter.DelegatingFilterProxy.initFilterBean(DelegatingFilterProxy.java:236)
    at org.springframework.web.filter.GenericFilterBean.init(GenericFilterBean.java:194)
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4775)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5452)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:656)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1635)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

gen 31, 2014 3:08:41 PM org.apache.catalina.core.StandardContext startInternal
Grave: Error …

今天当我试图在Geany中编译我的代码时,我遇到了这个错误

Could not find module `Control.Monad.Reader':
  it was found in multiple packages: monads-fd-0.1.0.1 mtl-1.1.0.2
Compilation failed.

我为Writer monad得到了同样的东西; 我以为我应该删除其中一个软件包,但我不想打破其他软件包,所以现在应该怎么做,昨天一切正常,没有任何问题.

我是Haskell的新手,我应该编写一个函数,在其参数中使用一个函数,使用它并返回一个函数,其行为根据我传入的函数而变化,要清楚:在我的应用程序中:一个简单的缓存服务器,我读过一个上下文文件和所有参数之间的"LOG:活动"如果日志处于活动状态我必须在屏幕上给出日志以进行调试,否则我什么都不写,我不想使用if-then链,因此我想过写一个函数

setLogging a = do
   if a
   then let logging x = putStrLn x
    in  return logging
   else let logging x = putStrLn ""
        in return logging

我以这种方式使用它doLog <- setLogging True并且它可以工作,我的函数应该返回从缓存中删除旧元素的函数:它必须包含多少元素由上下文决定; 这是我的功能

--ritorna la funzione che riduce la cache in funzione dell environment
setTrimming a = do
     if a=="active"
          then let trimming c logging = reduceCache 9  logging c --è attivo lowbandwidth
               in return trimming
          else let trimming c logging = reduceCache 5  logging c --non è attivo …