大约有 47,000 项符合查询结果（耗时：0.0465秒） [XML]
How do I join two SQLite tables in my Android application?
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You need rawQuery method.
Example:
private final String MY_QUERY = "SELECT * FROM table_a a INNER JOIN table_b b ON a.id=b.other_id WHERE b.property_id=?";
db.rawQuery(MY_QUERY, new String[]{String.valueOf(propertyId)});
Use ? bindings instead of putting values into raw sql query.
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Installing SciPy with pip
...://new.scipy.org/Wiki/Download
All is not lost, however; pip can install from Subversion (SVN), Git, Mercurial, and Bazaar repositories. SciPy uses SVN:
pip install svn+http://svn.scipy.org/svn/scipy/trunk/#egg=scipy
Update (12-2012):
pip install git+https://github.com/scipy/scipy.git
Since ...
postgresql COUNT(DISTINCT …) very slow
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You can use this:
SELECT COUNT(*) FROM (SELECT DISTINCT column_name FROM table_name) AS temp;
This is much faster than:
COUNT(DISTINCT column_name)
share
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How to use SharedPreferences in Android to store, fetch and edit values [closed]
...);
editor.putString("text", mSaved.getText().toString());
editor.putInt("selection-start", mSaved.getSelectionStart());
editor.putInt("selection-end", mSaved.getSelectionEnd());
editor.apply();
To retrieve data from sharedpreference
SharedPreferences prefs = getPreferences(MODE_PRIVATE);
Str...
Sql query to insert datetime in SQL Server
...clare @LangID smallint
declare @Alias sysname
declare @MaxLangID smallint
select @MaxLangID = max(langid) from sys.syslanguages
set @LangID = 0
while @LangID <= @MaxLangID
begin
select @Alias = alias
from sys.syslanguages
where langid = @LangID
if @Alias is not null
begin...
What is the argument for printf that formats a long?
...intf("%llu", n);
For all other combinations, I believe you use the table from the printf manual, taking the row, then column label for whatever type you're trying to print (as I do with printf("%llu", n) above).
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Is there a way to use shell_exec without waiting for the command to complete?
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This will execute a command and disconnect from the running process. Of course, it can be any command you want. But for a test, you can create a php file with a sleep(20) command it.
exec("nohup /usr/bin/php -f sleep.php > /dev/null 2>&1 &");
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How do I add options to a DropDownList using jQuery?
...lugins,
var myOptions = {
val1 : 'text1',
val2 : 'text2'
};
var mySelect = $('#mySelect');
$.each(myOptions, function(val, text) {
mySelect.append(
$('<option></option>').val(val).html(text)
);
});
If you had lots of options, or this code needed to be run very ...
Permission denied (publickey) when SSH Access to Amazon EC2 instance [closed]
...these steps:
Access to AWS Management Console
Open Elastic Beanstalk Tab
Select your application from All Applications Tab
From left side menù select Configuration
Click on the Instances Gear
In Server Form check the EC2 Key Pair input and select your new Key Pair. You may have to refresh the lis...
Auto start node.js server on boot
...alling a node express app as a service, and it's running (I get the output from the console.log calls in the *.out.log file), but when I try to get a response from the server via my web browser, I just get a 404 back.
– sanderd17
Oct 21 '16 at 10:53
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