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Null check in an enhanced for loop
... Note that Collections.emptyList() will avoid allocating an extra object (IIRC).
– Jon Skeet
Feb 12 '10 at 6:31
7
...
SQL update fields of one table from fields of another one
...tgreSQL syntax.
DO
$do$
BEGIN
EXECUTE (
SELECT
'UPDATE b
SET (' || string_agg( quote_ident(column_name), ',') || ')
= (' || string_agg('a.' || quote_ident(column_name), ',') || ')
FROM a
WHERE b.id = 123
AND a.id = b.id'
FROM information_schema.columns
WHERE t...
How to dynamic new Anonymous Class?
...ove fields on the fly.
edit
Sure you can: just cast it to IDictionary<string, object>. Then you can use the indexer.
You use the same casting technique to iterate over the fields:
dynamic employee = new ExpandoObject();
employee.Name = "John Smith";
employee.Age = 33;
foreach (var propert...
Proper use of the IDisposable interface
...d objects.
public class LoggingContext : IDisposable {
public Finicky(string name) {
Log.Write("Entering Log Context {0}", name);
Log.Indent();
}
public void Dispose() {
Log.Outdent();
}
public static void Main() {
Log.Write("Some initial stuff."...
What are the -Xms and -Xmx parameters when starting JVM?
...nary_prefix. In addition, because some unusable space is set aside for an extra pool of Survivor space, the amount of memory actually available according to Runtime.getRuntime().maxMemory() is less than the value specified via -Xmx
– nealmcb
Sep 30 '15 at 5:20...
Background color not showing in print preview
... via the @media print and @media screen.
Often times just setting up some extra @media print CSS is not enough because you still have all your other CSS included when printing as well. In these cases you just need to be aware of CSS specificity as the print rules don't automatically win against non...
【最全】CSS响应式布局的5种实现方式 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...应断点阈值设定
（括号后面是样式的缩写）
<576px （Extra small）
>=576px （Small --- sm）
>=769px （Medium --- md）
>=992px （Large --- lg）
>=1200px （X-Large --- xl）
>=1400px （XX-Large ---- xxl）
2、在实际开发中，常用的两种适配方案
a...
Javascript/jQuery: Set Values (Selection) in a multiple Select
...r values="Test,Prof,Off";
$.each(values.split(","), function(i,e){
$("#strings option[value='" + e + "']").prop("selected", true);
});
Working Example http://jsfiddle.net/McddQ/1/
share
|
impr...
WebAPI Multiple Put/Post parameters
...
[HttpPost]
public string MyMethod([FromBody]JObject data)
{
Customer customer = data["customerData"].ToObject<Customer>();
Product product = data["productData"].ToObject<Product>();
Employee employee = data["employeeDat...
Passing functions with arguments to another function in Python?
...o do this. My favorite way is using lambda because it avoids dependency on extra package and is the least verbose. Assume you have a function add(x, y) and you want to pass add(3, y) to some other function as parameter such that the other function decides the value for y.
Use lambda
# generic func...