大约有 44,000 项符合查询结果（耗时：0.0523秒） [XML]
Why there is no ForEach extension method on IEnumerable?
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Couldn't you just use Select instead of your Apply method? It seems to me that applying an action to each element and yielding it is exactly what Select does. E.g. numbers.Select(n => n*2);
– rasmusvhansen
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What are naming conventions for MongoDB?
... singular (collections are plural)
MongoDB states a nice example:
To select a database to use, in the mongo shell, issue the use <db>
statement, as in the following example:
use myDB
use myNewDB
Content from: https://docs.mongodb.com/manual/core/databases-and-collections/#...
How does virtual inheritance solve the “diamond” (multiple inheritance) ambiguity?
...virtual void eat(){ std::cout<<"EAT=>D";} };
int main(int argc, char ** argv){
A *a = new D();
a->eat();
delete a;
}
... that way the output is gonna be the correct one: "EAT=>D"
Virtual inheritance only solves the duplication of the grandfather!
BUT you still need ...
PHP + MySQL transactions examples
..._connect("localhost","Dude1", "SuperSecret") or die(mysql_error());
mysql_select_db("bedrock") or die(mysql_error());
$query = "INSERT INTO employee (ssn,name,phone) values ('123-45-6789','Matt','1-800-555-1212')";
begin(); // transaction begins
$result = mysql_query($query);
if(!$result){
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#1071 - Specified key was too long; max key length is 1000 bytes
... the best prefix length for a given column? Here's a method to find out:
SELECT
ROUND(SUM(LENGTH(`menu_link`)<10)*100/COUNT(`menu_link`),2) AS pct_length_10,
ROUND(SUM(LENGTH(`menu_link`)<20)*100/COUNT(`menu_link`),2) AS pct_length_20,
ROUND(SUM(LENGTH(`menu_link`)<50)*100/COUNT(`menu_...
How do I clear all options in a dropdown box?
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You can use the following to clear all the elements.
var select = document.getElementById("DropList");
var length = select.options.length;
for (i = length-1; i >= 0; i--) {
select.options[i] = null;
}
...
proper hibernate annotation for byte[]
...dar, java.sql.Date,
java.sql.Time, java.sql.Timestamp,
byte[], Byte[], char[], Character[], enums, and any other
type that implements Serializable.
As described in Section 2.8, the use
of the Basic annotation is optional
for persistent fields and properties
of these types. If the Basic...
When do I use a dot, arrow, or double colon to refer to members of a class in C++?
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Dot operator is used in direct member selection scenarios.
print(a.b)
Here, we are accessing b, which is a direct member of an object a. So, primarily, a is an object and b is a member (function/ variable etc) of a.
Arrow operator is used in indirect membe...
How to pick an image from gallery (SD Card) for my app?
...EQ_CODE_PICK_IMAGE:
if(resultCode == RESULT_OK){
Uri selectedImage = imageReturnedIntent.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(
selectedImage, fileP...
Using “label for” on radio buttons
...(label after input) is easier to style with CSS using the adjacent sibling selector +:
input[type="radio"]:checked+label {font-weight:bold;}
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