小编Jam*_*111的帖子

我正在尝试设置一个简单的hibernate应用程序,当我运行它时,我得到一个充满错误的堆栈跟踪.

我的文件中有以下maven依赖项pom.xml:

<dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.2.0.Final</version>
    </dependency>
    <!-- http://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>6.0.2</version>
    </dependency>

我在本地运行的mysql版本是:

5.7.9, for osx10.11 (x86_64)

我正在运行,似乎是一种非常简单的方法,但仍然会出现错误:

// create session factory
SessionFactory factory = new Configuration()
            .configure("hibernate.cfg.xml")
            .addAnnotatedClass(Model.class)
            .buildSessionFactory();

// create session
Session session = factory.getCurrentSession();

Model newModel = new Model("....", "...", "...");

// start a transaction
session.beginTransaction();

// save the student object
System.out.println("Saving the model...");
session.save(newModel);

执行上面的操作后,我得到一个很长的堆栈跟踪...... System.out.println也没有打印...所以连接似乎没有连接.

INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Thu Jun 09 17:36:28 EST 2016 WARN: …

所以我想要返回数据库结果而不是别的.目前我收到了大量的JSON数据(如下所示):

但我只需要[dataValues]属性.我不想使用这一点JSON来检索它:tagData[0].dataValues.tagId.

我只是注意到:当它找到并且不创建时,它将返回JSON数据库结果,但是当它找不到并创建时,它返回不需要的JSON blob(如下所示)有没有办法解决这个问题？

[ { dataValues:
     { tagId: 1,
       tagName: '#hash',
       updatedAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT),
       createdAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT) },
    _previousDataValues:
     { tagId: 1,
       tagName: '#hash',
       createdAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT),
       updatedAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT) },
    _changed:
     { tagId: false,
       tagName: false,
       createdAt: false,
       updatedAt: false },
    '$modelOptions':
     { timestamps: true,
       instanceMethods: {},
       classMethods: …

所以我试图在节点js中扩展一个类,并且编译器继续返回以下错误:

TypeError: Class extends value #<Object> is not a function or null

我检查过我正在正确导出课程,我是,有什么想法吗？我将在下面发布我的代码:

/handler/venue.js:

var VenueViews = require('../views/venue'); // If I remove this the error will dissapear (as expected)
class Venue {
  constructor(data) {
    this.setDataHere = data;
  }

  main () {
   var View = new VenueViews(); // This doesn't run
  }


}

module.exports = Venue;

/views/venue.js:

var Venue = require('../handlers/venue');
console.log  (Venue) // This returns {} ???

class VenueViews extends Venue {
  constructor() {
    super();
  }
}

module.exports = VenueViews; …

应用程序捆绑包：https : //developer.android.com/guide/app-bundle/这使Google Play可以管理签名，减小应用程序大小并允许按需提取代码，这真是太棒了！

我尝试进行设置，但是Android Studio不断告诉我我需要更新gradle版本吗？

这是我的build.gradle：

// Top-level build file where you can add configuration options common to all sub-projects/modules.

task wrapper(type: Wrapper) {
    gradleVersion = '4.4' //version required
}

buildscript {
    repositories {
        /**
         * Must stay in this order
         */
        google()
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
    }
}

subprojects {
    afterEvaluate { project ->
        if (project.hasProperty("android")) {
            android {
                compileSdkVersion 27
            }
        }
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { …

I've got a simple RequestMapping method that returns a list of Users, the Users model has a ONE TO MANY relation to HolidayDates...I'm just playing around with it, so I've chosen holiday dates as the relation (list of dates they went on a holiday).

So ONE user can have MANY related Dates.

User model:

@Entity
@Table(name="user")
public class User {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="userId")
    private int userId;

    @Column(name="about")
    private String about;

    // Maybe change to fetchtype eager
    @OneToMany(fetch …

我正在尝试使用AWS codebuild构建一个简单的docker应用程序,但是我遇到了一个找不到aws命令的错误:

[Container] 2016/12/10 04:29:17 Build started on Sat Dec 10 04:29:17 UTC 2016
[Container] 2016/12/10 04:29:17 Running command echo Building the Docker image...
[Container] 2016/12/10 04:29:17 Building the Docker image...
[Container] 2016/12/10 04:29:17 Running command docker build -t aws-test .
[Container] 2016/12/10 04:29:17 sh: 1: docker: not found
[Container] 2016/12/10 04:29:17 Command did not exit successfully docker build -t aws-test . exit status 127
[Container] 2016/12/10 04:29:17 Phase complete: BUILD Success: false
[Container] 2016/12/10 …

我是新来的React及React native,我试图retrieve data from an API然后渲染它,但我似乎遇到了问题.

我可以从中获取数据API,但是当我尝试render它时,我会遇到各种各样的错误.

基本上我所要做的就是渲染从API返回的照片.应该简单吧？非常感谢能够指引我走上正轨的人.

我收到的错误如下:

undefined不是RenderPhotos_render中的对象(评估'this.props.photos')

我可能已经React Native太早了......所以请原谅我缺乏知识!

var AwesomeProject = React.createClass({
    getInitialState: function() {
      return {
        isLoading: true,
        photos: this.props.photos
      };
    },
    componentWillMount: function(){
      fetch("http://localhost:3000/api/photos/", {
          method: "GET", 
          headers: {
            "x-access-token":"xxxxx",
            "x-key":"xxxx"
          },
        })
        .then((response) => response.json())
        .then((responseData) => {
            AlertIOS.alert(
                "GET Response",
                "Search Query -> " + JSON.stringify(responseData)
            )
            this.setState({
              isLoading: false
            });
            this.setState({
              photos: JSON.stringify(responseData)
            });
        })
        .done();
    },
    render: function() …

我正在尝试处理 Spring Rest 服务中的验证异常，如下所示：

@Produces("application/json")
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public @ResponseBody ResponseEntity<ValidationErrorDTO> processValidationError(MethodArgumentNotValidException ex) {
        BindingResult result = ex.getBindingResult();
        List<FieldError> fieldErrors = result.getFieldErrors();
        ResponseEntity<ValidationErrorDTO> re = new ResponseEntity<>(processFieldErrors(fieldErrors), HttpStatus.BAD_REQUEST);   
        return re;
    }

但是，当此代码执行时，它会返回附加到 JSON 响应的堆栈跟踪。我想摆脱这个堆栈跟踪，只返回 JSON 错误响应。这在 Spring 3.1 中可行吗？

{"fieldErrors":    
[{"field":"type","message":"Pattern.shippingAddress.type"}]}<pre>javax.servlet.ServletException: 400 Bad Request null
        at com.ebay.raptor.kernel.dispatcher.HttpDispatchCommand.execute(HttpDispatchCommand.java:142)
        at com.ebay.ebox.pres.cmd.preshandler.CommandDispatchHandler.handleRequest(CommandDispatchHandler.java:59)
        at com.ebay.ebox.pres.cmd.preshandler.CommandDispatchHandler.handleRequest(CommandDispatchHandler.java:13)
        at com.ebay.ebox.pres.cmd.preshandler.CommandHandlerFactory$CalHandler.handleRequest(CommandHandlerFactory.java:114)
        at com.ebay.ebox.pres.cmd.preshandler.CommandHandlerFactory$CalHandler.handleRequest(CommandHandlerFactory.java:75)
        at com.ebay.kernel.pipeline.RequestPipeline.invoke(RequestPipeline.java:18)
        at com.ebay.kernel.pipeline.RequestPipeline.invoke(RequestPipeline.java:12)
        at com.ebay.kernel.pipeline.BasePipeline.callHandler(BasePipeline.java:75)
        at com.ebay.kernel.pipeline.BasePipeline.execute(BasePipeline.java:53)
        at com.ebay.ebox.pres.stage.BaseCommandRequestStageImpl.doWork(BaseCommandRequestStageImpl.java:64)
        at com.ebay.kernel.stage.StageDriver.execute(StageDriver.java:55)
        at com.ebay.ebox.pres.cmd.WebCommandImpl.execute(WebCommandImpl.java:30)
        at com.ebay.raptor.web.RaptorFrontController.process(RaptorFrontController.java:338)
        at com.ebay.raptor.web.RaptorFrontController.doPost(RaptorFrontController.java:554)
        at com.ebay.raptor.web.RaptorGenericController.service(RaptorGenericController.java:64)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) …

这是让我烦恼的一件事!我必须为几乎相同的查询编写2个不同的函数!

假设我有一个返回的API posts与特定的typeId和cityId.为了获得ALL了关联到职位typeId 1 OR 2, OR 3 和 cityId 1我会解析以下我sequelize findAll查询:

$or: [{typeId: 1}, {typeId: 2}, {typeId: 3}]
cityId: 1

但是说我希望得到所有帖子,cityId = 1 andOr typeId = 1,2,3,4,5,6,7,8,9,10,etc...我不能做以下事情:

var types = [{typeId: 1}, {typeId: 2}, {typeId: 3}]
Post.findAll({
     where: {
          if (types != []) $or: types,
          cityId: 1
      }

所以我必须创建一个不包含$or: typeswhere子句的新查询...因为如果我解析一个空types数组,我得到一个奇怪的sql输出:

WHERE 0 = 1 AND `post`.`cityId` = '1'

注意它是如何输出0 = 1的？不知道为什么

当我在 CircleCI 上运行我的测试时，它会多次记录以下消息，最终测试失败，因为由于死锁，没有任何数据库方法可以检索数据：

{
  "message": "Error running raw sql query in pool.",
  "stack": "error: deadlock detected\n    at Connection.Object.<anonymous>.Connection.parseE (/home/circleci/backend/node_modules/pg/lib/connection.js:567:11)\n    at Connection.Object.<anonymous>.Connection.parseMessage (/home/circleci/-backend/node_modules/pg/lib/connection.js:391:17)\n    at Socket.<anonymous> (/home/circleci/backend/node_modules/pg/lib/connection.js:129:22)\n    at emitOne (events.js:116:13)\n    at Socket.emit (events.js:211:7)\n    at addChunk (_stream_readable.js:263:12)\n    at readableAddChunk (_stream_readable.js:250:11)\n    at Socket.Readable.push (_stream_readable.js:208:10)\n    at TCP.onread (net.js:597:20)",
  "name": "error",
  "length": 316,
  "severity": "ERROR",
  "code": "40P01",
  "detail": "Process 1000 waits for AccessExclusiveLock on relation 17925 of database 16384; blocked by process 986.\nProcess 986 waits for RowShareLock on relation 17870 of database 16384; blocked by process …