大约有 30,000 项符合查询结果（耗时：0.0348秒） [XML]
SQL - many-to-many table primary key
...yes, but again, each of those orders will almost certainly be queried many times to do (for example) packaging, billing, status updates, business analytics and so on. The absolute number of creates is less important than the ratio between creates and reads.
– paxdiablo
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What is an anti-pattern?
I am studying patterns and anti-patterns. I have a clear idea about patterns, but I don't get anti-patterns. Definitions from the web and Wikipedia confuse me a lot.
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Debugging in Clojure? [closed]
What are best ways to Debug Clojure code, while using the repl?
14 Answers
14
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Declaring array of objects
...rray.
var sample = new Array();
sample.push(new Object());
To do this n times use a for loop.
var n = 100;
var sample = new Array();
for (var i = 0; i < n; i++)
sample.push(new Object());
Note that you can also substitute new Array() with [] and new Object() with {} so it becomes:
va...
Could not reserve enough space for object heap
I am getting the following exception repeatedly each time I try to run the program.
26 Answers
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What are detached, persistent and transient objects in hibernate?
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We many time dont follow original docs provided by frameworks.. which sometime itself have hidden information with proper description just need to explore. only prob is we don't find it easily :)
– agpt
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Difference between binary tree and binary search tree
Can anyone please explain the difference between binary tree and binary search tree with an example ?
12 Answers
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Does Ruby regular expression have a not match operator like “!~” in Perl?
I just want to know whether ruby regex has a not match operator just like !~ in perl. I feel it's inconvenient to use (?!xxx) or (?<!xxxx) because you cannot use regex patterns in the xxx part.
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Understand homebrew and keg-only dependencies
I've recently started using homebrew, and I'm a bit confused as to what happens when I brew something onto my system, but its brewed dependencies are keg-only, meaning that they are linked under /usr/local .
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How to select the nth row in a SQL database table?
...following snippet grabs the 15th entry from the_table, sorting by the date/time it was added:
SELECT * FROM the_table ORDER BY added DESC LIMIT 1,15
(of course, you'd need to have an added DATETIME field, and set it to the date/time that entry was added...)
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