大约有 740 项符合查询结果（耗时：0.0156秒） [XML]
SQL: deleting tables with prefix
...riable to delete ALL tables starting with 'temp_'
SET GROUP_CONCAT_MAX_LEN=10000;
SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME)
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = 'my_database'
AND TABLE_NAME LIKE 'temp_%');
SET @delStmt = CONCAT('DROP TAB...
Parsing a CSV file using NodeJS
With nodejs I want to parse a .csv file of 10000 records and do some operation on each row. I tried using http://www.adaltas.com/projects/node-csv . I couldnt get this to pause at each row. This just reads through all the 10000 records. I need to do the following:
...
How to wait 5 seconds with jQuery?
...
1000 = 1 second
2000= 2 seconds
2200 = 2.2 seconds
3500 = 3.5 seconds
10000 = 10 seconds
etc.
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How to replace multiple strings in a file using PowerShell
...where you have a hash table with hex values as strings (0x0, 0x1, 0x100, 0x10000) and 0x10000 will match 0x1.
– Lorek
Sep 21 '16 at 0:50
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Accurate way to measure execution times of php scripts
... your script. You can simply do:
<?php
// Do stuff
usleep(mt_rand(100, 10000));
// At the end of your script
$time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];
echo "Did stuff in $time seconds\n";
?>
Here, $time would contain the time elapsed since the start of the script in second...
Merge two (or more) lists into one, in C# .NET
... correct final size - whereas the code in my answer does. Do that, and the 10000*10000 test is faster using AddRange, at least - although other results are inconsistent. (You should also force garbage collection between tests - and I'd argue that the very short tests are meaninglessly small.)
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Get Android API level of phone currently running my application [duplicate]
...ndroid 9 Pie
29 Q Android 10
10000 CUR_DEVELOPMENT Current Development Version
Note that some time between Android N and O, the Android SDK began aliasing CUR_DEVELOPMENT and the developer preview of the next major Android vers...
From ND to 1D arrays
...--------+-------------+
| function | 10x10 | 100x100 | 1000x1000 | 10000x10000 |
+-------------+----------+-----------+-----------+-------------+
| ravel | 0.002073 | 0.002123 | 0.002153 | 0.002077 |
| reshape(-1) | 0.002612 | 0.002635 | 0.002674 | 0.002701 |
| flatten | ...
Seeding the random number generator in Javascript
...answer.)
var seed = 1;
function random() {
var x = Math.sin(seed++) * 10000;
return x - Math.floor(x);
}
You can set seed to be any number, just avoid zero (or any multiple of Math.PI).
The elegance of this solution, in my opinion, comes from the lack of any "magic" numbers (besides 1000...
SQL WHERE ID IN (id1, id2, …, idn)
...ould be decided based upon the memory size of your server
Suppose you have 10000 Ids, you will have 10000/100 = 100 chunks
Process one chunk at a time resulting in 100 database calls for select
Why should you divide into chunks?
You will never get memory overflow exception which is very common...