大约有 18,400 项符合查询结果（耗时：0.0215秒） [XML]
MySQL: Fastest way to count number of rows
...a from mysql to php. Why do it when you can achieve the same on the mysql side?
If the COUNT(*) is slow, you should run EXPLAIN on the query, and check if indexes are really used, and where should they be added.
The following is not the fastest way, but there is a case, where COUNT(*) doesn't re...
jQuery hasAttr checking to see if there is an attribute on an element [duplicate]
...turn false as well. It should be true, because an empty attribute is a valid attribute. Also, there's no need for a double-not because if casts it down to bool anyway.
– strager
Feb 4 '11 at 1:15
...
Convert JSON String To C# Object
...st {
String test;
String getTest() { return test; }
void setTest(String test) { this.test = test; }
}
Then your deserialization code would be:
JavaScriptSerializer json_serializer = new JavaScriptSerializer();
Test routes_list =
(Test)json_serializer.Deser...
How do I expire a PHP session after 30 minutes?
... collector is only started with a probability of session.gc_probability divided by session.gc_divisor. And using the default values for those options (1 and 100 respectively), the chance is only at 1%.
Well, you could simply adjust these values so that the garbage collector is started more often. B...
Android Gallery on Android 4.4 (KitKat) returns different URI for Intent.ACTION_GET_CONTENT
... startActivityForResult(intent, GALLERY_KITKAT_INTENT_CALLED);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) return;
if (null == data) return;
U...
What is the difference between ExecuteScalar, ExecuteReader and ExecuteNonQuery?
... result is the first column of the first row. An example might be SELECT @@IDENTITY AS 'Identity'.
ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable).
ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT,...
textarea's rows, and cols attribute in CSS
...
width and height are used when going the css route.
<!DOCTYPE html>
<html>
<head>
<title>Setting Width and Height on Textareas</title>
<style>
.comments { wi...
changing source on html5 video tag
i'm trying to build a video player, that works everywhere. so far i'd be going with:
16 Answers
...
How to handle code when app is killed by swiping in android?
...r listeners, how can i do that? I read quite a few articles and blogs but didn't get any useful information and I haven't found any documentation about it.
Any help would be appreciated.
Thanks in advance.
...
How to show soft-keyboard when edittext is focused
...yboard to appear, you can use
EditText yourEditText= (EditText) findViewById(R.id.yourEditText);
yourEditText.requestFocus();
InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(yourEditText, InputMethodManager.SHOW_IMPLICIT);
And for re...