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How to add column if not exists on PostgreSQL?
...statement:
DO $$
BEGIN
BEGIN
ALTER TABLE <table_name> ADD COLUMN <column_name> <column_type>;
EXCEPTION
WHEN duplicate_column THEN RAISE NOTICE 'column <column_name> already exists in <table_name>.';
END;
END;
$$
...
How to keep the spaces at the end and/or at the beginning of a String?
I have to concatenate these two strings from my resource/value files:
16 Answers
16
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9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
9个常用iptables配置实例iptables命令可用于配置Linux的包过滤规则，常用于实现防火墙、NAT。咋一看iptables的配置很复杂，掌握规律后，其实用iptables完成指定任务...iptables命令可用于配置Linux的包过滤规则，常用于实现防火墙、NAT。...
Why is there no SortedList in Java?
In Java there are the SortedSet and SortedMap interfaces. Both belong to the Java Collections framework and provide a sorted way to access the elements.
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Random strings in Python
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answered Jan 8 '10 at 19:32
BrandonBrandon
3,27411 gold badge1515 silver badges2424 bronze badges
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How can I add a custom HTTP header to ajax request with js or jQuery?
... a $.ajax?
– Kostas
Jul 9 '13 at 14:32
3
You can only define one beforeSend callback. If you call...
Custom thread pool in Java 8 parallel stream
...gt;
// Parallel task here, for example
IntStream.range(1, 1_000_000).parallel()
.filter(PrimesPrint::isPrime)
.boxed().collect(Collectors.toList())
).get();
System.out.println(primes);
} catch (InterruptedException | ExecutionException e) {
...
How to import a class from default package
...s_Calculate(PEnv: PJNIEnv; Obj: JObject; contextId: JInt):JInt; {$IFDEF WIN32} stdcall; {$ENDIF} {$IFDEF LINUX} cdecl; {$ENDIF}
var
//Any variables you might be interested in
begin
//Some code goes here
end;
function Java_com_mypackage_Calculations_GetProgress(PEnv: PJNIEnv; Obj: JObject; conte...
What's the difference between design patterns and architectural patterns?
...uncpyfunc
58.3k1414 gold badges137137 silver badges132132 bronze badges
14
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Is there a way to navigate to real implementation of method behind an interface?
In Visual Studio, when you right-click a method call, you go to the implementation of that method inside a class except if you access this method through an interface: in that case you go to the interface method not to the actual implementation.
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