小编Ros*_*s J的帖子

目前，AWS Glue 作业读取 S3 集合并将其写入 AWS Redshift 时遇到问题，其中有一列包含null值。

这项工作应该相当简单，大部分代码是由 Glue 接口自动生成的，但由于 Redshift 中没有空列，而这些列在我们的数据集中有时为空，因此我们无法完成这项工作。

代码的精简版本如下所示，代码采用 Python 语言，环境为 PySpark。

datasource0 = glueContext.create_dynamic_frame.from_catalog(database = "db_1", table_name = "table_1", transformation_ctx = "datasource0")

resolvedDDF = datasource0.resolveChoice(specs = [
  ('price_current','cast:double'),
  ('price_discount','cast:double'),
])

applymapping = ApplyMapping.apply(frame = resolvedDDF, mappings = [
  ("id", "string", "id", "string"), 
  ("status", "string", "status", "string"), 
  ("price_current", "double", "price_current", "double"), 
  ("price_discount", "double", "price_discount", "double"), 
  ("created_at", "string", "created_at", "string"), 
  ("updated_at", "string", "updated_at", "string"), 
], transformation_ctx = "applymapping")

droppedDF = applymapping.toDF().dropna(subset=('created_at', 'price_current'))

newDynamicDF = …

我有一个新的Intent Activity我想在双击注册时打开,我知道双击工作正常,但每次我尝试启动新活动时它都会停止工作？(强制退出)

代码:

 imView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                long thisTime = System.currentTimeMillis();
                  if (thisTime - lastTouchTime < 250) {
                     // Double click
                      //Toast toast = Toast.makeText(getApplicationContext(), "Double Tap Worked!", 10);
                      //toast.show();
                      lastTouchTime = -1;
                      Intent myIntent = new Intent(v.getContext(), zoom.class);
                      startActivityForResult(myIntent, 0);

                  } else {
                      // too slow
                      lastTouchTime = thisTime;
                  }
            }
         });

我一直在考虑使用Node和MongoDb作为Android应用程序的评级系统,到目前为止,我已经实现了创建,更新和删除,但是如果我想从平均评级中获取平均评级,该怎么办？ D B.这是我给出的数据结构决定:

[
  {
    "_id": "1",
    "ratings": [
      {
        "value": "5",
        "user": "CoolUser1"
      },
      {
        "value": "4",
        "user": "CoolUser2"
      }
    ]
  },
  {
    "_id": "2",
    "ratings": [
      {
        "value": "4",
        "user": "CoolUser3"
      },
      {
        "value": "2",
        "user": "CoolUser4"
      }
    ]
  }
]

基本上我需要的是给定_id的评级的平均值.

这是我用来了解如何设置mongoDB连接的Update方法:

exports.updateRating = function(req, res) {
    var id = req.params.id;
    var rating = req.body;
    console.log('Updating a rating: ' + id);
    console.log(JSON.stringify(rating));
        ratings.update({'_id': id}, 
                        {$push: rating}, 
                        {upsert:true}, 
                        function(err, result) {
                            if (err) {
                                console.log('Error updating rating: ' …

我有一个UIImageView内部的UITableViewCell,并希望将它扩大到充满整个屏幕,我有我的设置UIGestureRecognizer和我使用此代码扩展框架:

[UIView animateWithDuration:1.0 animations:^{
        [self.ImageView setFrame:[[UIScreen mainScreen] applicationFrame]];
}];

但是,UIImageView只会扩展以填充UITableViewCell并且不会填满整个屏幕.

任何帮助将非常感激.