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How to check a not-defined variable in JavaScript
...lejandroSilva Sorry for late reply. That won't work since typeof returns a string, so it will return 'undefined' for an undefined variable, which in turn will evaluate as TRUE therefore leading to a false positive of a defined var.
– Dmitri Farkov
Mar 17 '15 at...
Hibernate: hbm2ddl.auto=update in production?
...erstand when datatypes for columns have changed. Examples (using MySQL):
String with @Column(length=50) ==> varchar(50)
changed to
String with @Column(length=100) ==> still varchar(50), not changed to varchar(100)
@Temporal(TemporalType.TIMESTAMP,TIME,DATE) will not update the DB columns i...
What's the best method in ASP.NET to obtain the current domain?
...Aagaard, but you could always make one locally. I do that for most "magic" strings and numbers. For that matter, you would then use string.Empty instead of "" in Carlos' answer ;)
– vbullinger
Aug 10 '12 at 21:34
...
Where is the Java SDK folder in my computer? Ubuntu 12.04
...t root 31 2009-01-15 18:34 /etc/alternatives/java -> /usr/local/jre1.6.0_07/bin/java
So, thats the actual location of java: /usr/local/jre.....
You could still dig deeper to find other symbolic links.
Reference : where is java's home dir?
...
SVN needs-lock 设置强制只读属性（官方资料） - 更多技术 - 清泛网 - 专注...
...when the property is not available
sets the svn:needs-lock property on all already existing binary files in repositories
configures users to automatically set property svn:needs-lock on newly added binary files
1) - create a pre-commit.cmd script in the repository\hooks directory. This scri...
Difference between new and override
...c override void DoIt() { Console.WriteLine("Class2"); }
}
static void Main(string[] args)
{
var c1 = new Class1();
c1.DoIt();
((Base1)c1).DoIt();
var c2 = new Class2();
c2.DoIt();
((Base2)c2).DoIt();
Console.Read();
}
...
xtreme toolkit pro——CXTPReportControl控件教程 - C/C++ - 清泛网 - 专注C/C++及内核技术
...自定义控件，将该控件的class属性改为XTPReport，ID改为;IDC_REPORTCTRL_LIST。
（2）添加一个自定义变量：CXTPReportControl m_wndReportCtrl;
（3）将控件和变量联系起来，在对话框初始化函数OnInitDialog()中添加如下代码：
m_wndReportCtrlList.Sub...
Java system properties and environment variables
...e=value syntax. They can also be added at runtime
using System.setProperty(String key, String value) or via the various
System.getProperties().load() methods.
To get a specific system property you can use System.getProperty(String key) or System.getProperty(String key, String def).
Environment varia...
In PHP with PDO, how to check the final SQL parametrized query? [duplicate]
...with parametrised values is not simply another way to dynamically create a string of SQL. You create a prepared statement at the database, and then send the parameter values alone.
So what is probably sent to the database will be a PREPARE ..., then SET ... and finally EXECUTE ....
You won't be ab...
How to send a message to a particular client with socket.io
...ver with the following data:
{
to:[the other receiver's username as a string],
from:[the person who sent the message as string],
message:[the message to be sent as string]
}
On the server, listen for messages. When a message is received, emit the data to the receiver.
users[data.to]....