大约有 23,000 项符合查询结果（耗时：0.0298秒） [XML]
xpath find if node exists
... element and look to see if the result is nil.
require 'nokogiri'
url = "http://somthing.com/resource"
resp = Nokogiri::XML(open(url))
first_name = resp.xpath("/movies/actors/actor[1]/first-name")
puts "first-name not found" if first_name.nil?
...
JavaScript math, round to two decimal places [duplicate]
...und up or down for you depending on the values beyond 2 decimals.
Example: http://jsfiddle.net/calder12/tv9HY/
Documentation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed
Edit - As mentioned by others this converts the result to a string. To avoid t...
MySQL “Group By” and “Order By”
...points out below the solution is to use ANY_VALUE() from 5.7 and above
See
http://www.cafewebmaster.com/mysql-order-sort-group
https://dev.mysql.com/doc/refman/5.6/en/group-by-handling.html
https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
https://dev.mysql.com/doc/refman/5.7/en/miscell...
How to express infinity in Ruby?
...
http://www.ruby-doc.org/stdlib-1.9.3/libdoc/bigdecimal/rdoc/BigDecimal.html#label-Infinity
1.9.3p429 :025 > BigDecimal('Infinity')
=> #<BigDecimal:7f8a6c548140,'Infinity',9(9)>
1.9.3p429 :026 > BigDecimal('-I...
JPA and Hibernate - Criteria vs. JPQL or HQL
...enerated SQL, taking more time to execute.
Regarding fetching strategies [http://www.hibernate.org/315.html]
Criteria respects the laziness settings in your mappings and guarantees that what you want loaded is loaded. This means one Criteria query might result in several SQL immediate SELEC...
Redirect from asp.net web api post action
...
Sure:
public HttpResponseMessage Post()
{
// ... do the job
// now redirect
var response = Request.CreateResponse(HttpStatusCode.Moved);
response.Headers.Location = new Uri("http://www.abcmvc.com");
return response;
}...
Precise Financial Calculation in JavaScript. What Are the Gotchas?
...$, $ } = require('moneysafe');
console.log(in$($(10.5) + $(.3)); // 10.8
https://github.com/ericelliott/moneysafe
Works both in Node.js and the browser.
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Maven: best way of linking custom external JAR to my project?
...upId/artifactId/version/artifactId-verion.jar
detail read this blog post
https://web.archive.org/web/20121026021311/charlie.cu.cc/2012/06/how-add-external-libraries-maven
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How do I configure Notepad++ to use spaces instead of tabs?
...the Replace with space check box. Set the size to 4.
See documentation: http://docs.notepad-plus-plus.org/index.php/Built-in_Languages#Tab_settings
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JavaScript: empty array, [ ] evaluates to true in conditional structures. Why is this?
...
From http://www.sitepoint.com/javascript-truthy-falsy/
The following values are always falsy:
false
0 (zero)
"" (empty string)
null
undefined
NaN (a special Number value meaning Not-a-Number!)
All other values are truthy, inc...