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How to create and handle composite primary key in JPA
...n have a reference to that class as EmbeddedId in your Entity.
You would need the @EmbeddedId and @Embeddable annotations.
@Entity
public class YourEntity {
@EmbeddedId
private MyKey myKey;
@Column(name = "ColumnA")
private String columnA;
/** Your getters and setters **/
}
...
How do I put a border around an Android textview?
...so use padding to separate the text from the border.
for more information see: http://developer.android.com/guide/topics/resources/drawable-resource.html
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When and how should I use a ThreadLocal variable?
... DateFormats local because they are expensive to create, but I have never seen solid metrics on this topic.
– Julien Chastang
May 4 '09 at 3:39
19
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
....Net下的工具 正则表达式测试器。请参考该页面的说明来安装和运行该软件。
下面是Regex Tester运行时的截图：
元字符
现在你已经知道几个很有用的元字符了，如\b,.,*，还有\d.正则表达式里还有更多的元字符，比如\s匹配任意...
How to initialize log4j properly?
...r
log4j.appender.R.File=example.log
log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
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@UniqueConstraint and @Column(unique = true) in hibernate annotation
What is difference between @UniqueConstraint and @Column(unique = true) ?
4 Answers
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What to add for the update portion in ConcurrentDictionary AddOrUpdate
...
You need to pass a Func which returns the value to be stored in the dictionary in case of an update. I guess in your case (since you don't distinguish between add and update) this would be:
var sessionId = a.Session.SessionID.ToS...
Recommended way to stop a Gradle build
...ething != whatever) { "No good!" } as opposed to the more verbose and type-ee if(something != whatever){ throw new GradleException("No good!") }
– Groostav
Oct 20 '16 at 19:51
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How to limit the maximum value of a numeric field in a Django model?
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You could also create a custom model field type - see http://docs.djangoproject.com/en/dev/howto/custom-model-fields/#howto-custom-model-fields
In this case, you could 'inherit' from the built-in IntegerField and override its validation logic.
The more I think about this, I...
“new” keyword in Scala
...ct Foo {
def apply() = new Foo
}
So you can do
f = Foo()
Lastly, keep in mind that there's no rule that says that the companion apply
method has to be a proxy for the constructor:
class Foo { }
object Foo {
def apply() = 7
}
// These do different things
> println(new Foo)
test@5c79...