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PG::ConnectionBad - could not connect to server: Connection refused
...
It could be as simple as a stale PID file. It could be failing silently because your computer didn't complete the shutdown process completely which means postgres didn't delete the PID (process id) file.
The PID file is used by postgres to make sure only on...
How do I update an entity using spring-data-jpa?
...nce API explicitly: you call insert to insert an object, or update to save new state of the object to the database.
Unit of Work approach. In this case you have a set of objects managed by persistence library. All changes you make to these objects will be flushed to the database automatically at the...
Converting int to bytes in Python 3
... namely the byte value used to encode the digit "3" in ASCII, ie. bytes([51]), which is b'3', not b'\x03'.
– lenz
Apr 1 '17 at 21:13
2
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Why always ./configure; make; make install; as 3 separate steps?
...target is all, but not always. So you could only make all install if you knew that was the target.
So ...
#!/bin/sh
if ./configure $*; then
if make; then
make install
fi
fi
or:
./configure $* && ./make && ./make install
The $* is included because one often has to pro...
关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...nn);
}
fclose($socket);
}
}
new SocketServer(2000);
2、使用 select/poll 的同步模型：属于同步非阻塞 IO 模型，代码如下：
<?php
/**
* SelectSocketServer Class
* By James.Huang <shagoo#gmail.com>
**/
set_time_limit(0)...
ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged)
...t; }
}
public CollectionViewModel()
{
_contentList = new ObservableCollection<EntityViewModel>();
_contentList.CollectionChanged += ContentCollectionChanged;
}
public void ContentCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
...
An App ID with Identifier '' is not available. Please enter a different string
I am trying to add a new APP ID to prepare for App Store submission and got the following error under the bundle ID I provided.
...
How can I assign an ID to a view programmatically?
...indViewById(placeholderId);
for (int i=0; i<20; i++){
TextView tv = new TextView(this.getApplicationContext());
// One new TextView will also be assigned an id==12:
tv.setId(i);
placeholder.addView(tv);
}
So placeholder and one of our new TextViews both have an id of 12! But thi...
How to check if an option is selected?
...
It looks like you didn't read my answer. this.selected can be used instead of $(this).is(":selected") I guess there is no need for a jsperf for this, right? I have nothing against using jQuery!, but use it when you need it, not when it give not...
Including one C source file in another?
....h. If you use include guards, these will produce no code and introduce no new names (you may end up with some empty segments during linkage). The huge advantage is that other tools (e.g. IDEs) will treat these files appropriately.
...