大约有 48,000 项符合查询结果（耗时：0.0263秒） [XML]
Cosmic Rays: what is the probability they will affect a program?
...ome cases from alpha-emitters inside PC. BH authors did experiment and got 50000 accesses to domains, having 1 bit changed from popular sites
– osgx
May 14 '14 at 10:45
...
How do you convert a byte array to a hexadecimal string, and vice versa?
...1.1X faster)
Sentence: 17.95 (2.2X faster)
Array.ConvertAll (using string.Concat, requires .NET 4.0) (via Will Dean)
Text: 752,078.70 (1.0X faster)
Sentence: 18.28 (2.2X faster)
{StringBuilder}.AppendFormat (using foreach) (via Tomalak)
Text: 672,115.77 (1.1X faster)
Sentence: 36.82 (1.1X fast...
How to remove illegal characters from path and filenames?
...s":
public string RemoveInvalidChars(string filename)
{
return string.Concat(filename.Split(Path.GetInvalidFileNameChars()));
}
You may instead want to replace them:
public string ReplaceInvalidChars(string filename)
{
return string.Join("_", filename.Split(Path.GetInvalidFileNameChars()...
How to do a regular expression replace in MySQL?
...= SUBSTRING(original,i,1);
IF NOT ch REGEXP pattern THEN
SET temp = CONCAT(temp,ch);
ELSE
SET temp = CONCAT(temp,replacement);
END IF;
SET i=i+1;
END LOOP;
ELSE
SET temp = original;
END IF;
RETURN temp;
END$$
DELIMITER ;
Example execution:
mysql> select regex_replac...
How do I force Postgres to use a particular index?
...t for what qualifies for a small table? Is it something like 5000 rows, or 50000 etc?
– waffl
Jul 22 '14 at 8:46
1
...
How to measure time taken by a function to execute
...uary 1, 1970.
ex.
var start = new Date().getTime();
for (i = 0; i < 50000; ++i) {
// do something
}
var end = new Date().getTime();
var time = end - start;
alert('Execution time: ' + time);
share
|
...
How to concatenate strings of a string field in a PostgreSQL 'group by' query?
I am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 An...
How to find all tables that have foreign keys that reference particular table.column and have values
... name, which is required in some cases (e.g. drop constraint):
SELECT
CONCAT(table_name, '.', column_name) AS 'foreign key',
CONCAT(referenced_table_name, '.', referenced_column_name) AS 'references',
constraint_name AS 'constraint name'
FROM
information_schema.key_column_usage
WHER...
XPath to find elements that does not have an id or class
...ss, 'b'))]
Or if you want to be sure not to match partial.
//*[contains(concat(' ', normalize-space(@class), ' '), ' some-class ') and
not(contains(concat(' ', normalize-space(@class), ' '), ' another-class '))]
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...
How do I Geocode 20 addresses without receiving an OVER_QUERY_LIMIT response?
.... If status of the request is OVER_QUERY_LIMIT, the usleep is increased by 50000 and request is repeated, and so on.
And of cause all received data (lat/long) are stored in XML file not to run request every time the page is loading.
...