我做了一个工作正常的应用程序.它显示应用程序启动的次数.这是代码:
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.widget.TextView;
public class PreferencesDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Get the app's shared preferences
SharedPreferences app_preferences =
PreferenceManager.getDefaultSharedPreferences(this);
// Get the value for the run counter
int counter = app_preferences.getInt("counter", 0);
// Update the TextView
TextView text = (TextView) findViewById(R.id.text);
text.setText("This app has been started " + counter + " times.");
// Increment the …Run Code Online (Sandbox Code Playgroud) 我已经尝试了以下两个查询,并且它们同时执行.但我仍然看到在许多存储过程中使用的RaiseError而不是print.
查询1:
BEGIN
WAITFOR DELAY '00:00:03.00'
PRINT 'DELAY 1 HAS ENDED'
WAITFOR DELAY '00:00:03.00'
PRINT 'DELAY 2 HAS ENDED'
END
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查询2:
BEGIN
WAITFOR DELAY '00:00:03.00'
RAISERROR ('DELAY 1 HAS ENDED', 10,1) WITH NOWAIT
WAITFOR DELAY '00:00:03.00'
RAISERROR ('DELAY 2 HAS ENDED', 10,1) WITH NOWAIT
END
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两者都在6秒后才提供所需的输出(我在SQL Server 2008 R2中检查了这一点)
我更喜欢C/C++.但是,如果我想为开源项目做贡献,我在校的很多老年人都会让我学习Java.我处于两难境地.该怎么办?我们不能用C/C++做一个设计项目吗?
我正在使用 AWS Glue 读取包含 JSON 的数据文件(在 S3 上)。这是一个包含在数组中的数据的 JSON。我试过使用relationalize() 函数,但它不适用于数组。它确实适用于嵌套的 JSON,但这不是输入的数据格式。
有没有办法将 JSON 与其中的数组关联起来?
输入数据:
{
"ID":"1234",
"territory":"US",
"imgList":[
{
"type":"box"
"locale":"en-US"
"url":"boxart/url.jpg"
},
{
"type":"square"
"locale":"en-US"
"url":"square/url.jpg"
}
]
}
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代码:
dfc = Relationalize.apply(frame = datasource0, staging_path = glue_temp_storage, name = "root", transformation_ctx = "dfc")
dfc.select('root').toDF().show()
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输出:
+----+----------+--------+
|ID |territory |imgList |
+----+----------+--------+
|1234| US | 1|
+----+----------+--------+
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期望的输出:
+----+----------+-------------+---------------+---------------+
|ID |territory |imgList.type |imgList.locale |imgList.url |
+----+----------+-------------+---------------+---------------+
|1234| US | box | en-US |boxart/url.jpg |
+----+----------+-------------+---------------+---------------+
|1234| US | …Run Code Online (Sandbox Code Playgroud)