大约有 47,000 项符合查询结果（耗时：0.0327秒） [XML]
Rails 3 execute custom sql query without a model
...o_hash
From the docs:
result = ActiveRecord::Base.connection.exec_query('SELECT id, title, body FROM posts')
result # => #<ActiveRecord::Result:0xdeadbeef>
# Get the column names of the result:
result.columns
# => ["id", "title", "body"]
# Get the record values of the result:
result...
Android Studio: how to attach Android SDK sources?
...uild.gradle with the desired API level.
In the Project window on the left, select the External Libraries drop-down.
Right click the menu item and select Open Library Settings.
Click the Sourcepath tab and use the + icon at the bottom left to link to the desired SDK sources (should be in something/s...
SQL UPDATE all values in a field with appended string CONCAT not working
...
That's pretty much all you need:
mysql> select * from t;
+------+-------+
| id | data |
+------+-------+
| 1 | max |
| 2 | linda |
| 3 | sam |
| 4 | henry |
+------+-------+
4 rows in set (0.02 sec)
mysql> update t set data=concat(data, 'a');...
Export Postgresql table data using pgAdmin
...
Just right click on a table and select "backup". The popup will show various options, including "Format", select "plain" and you get plain SQL.
pgAdmin is just using pg_dump to create the dump, also when you want plain SQL.
It uses something like this: ...
Javascript - How to extract filename from a file input control
When a user selects a file in a web page I want to be able to extract just the filename.
14 Answers
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jQuery: find element by text
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You can use the :contains selector to get elements based on their content.
Demo here
$('div:contains("test")').css('background-color', 'red');
<div>This is a test</div>
<div>Another Div</div>
<script src="https://...
Preserving order with LINQ
...p a source element by index to a result element
AsEnumerable
Cast
Concat
Select
ToArray
ToList
Preserves Order. Elements are filtered or added, but not re-ordered.
Distinct
Except
Intersect
OfType
Prepend (new in .net 4.7.1)
Skip
SkipWhile
Take
TakeWhile
Where
Zip (new in .net 4)
Destroys O...
Using scanner.nextLine() [duplicate]
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I think your problem is that
int selection = scanner.nextInt();
reads just the number, not the end of line or anything after the number. When you declare
String sentence = scanner.nextLine();
This reads the remainder of the line with the number on it (...
How to simulate Android killing my process
...at window in Android Studio (this will kill the app process, make sure you select your device and process in Logcat dropdowns at top)
Get back to the application with Home long press or opened apps (depends on the device)
Application will start in recreated ActivityD (ActivityA, ActivityB, ActivityC...
How to make all Objects in AWS S3 bucket public by default?
...n.s3.amazonaws.com/policygen.html
Fill in the details such as:
In Action select "GetObject"
Select "Add Statement"
Then select "Generate Policy"
Copy the text example:
{
"Id": "Policy1397632521960",
"Statement": [
{
"Sid": "Stmt1397633323327",
"Action": [
"s3:GetObjec...