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PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ew Mongo();
$instance = $instance->selectCollection('test', 'test');
for ($i = 0; $i < 10; $i++) {
$instance->insert(array(
'group_id' => rand(1, 5),
'count' => rand(1, 5),
));
}
?>
下面让我们使用group操作，根据group_id分组，汇总计算count...
What does the KEY keyword mean?
...ture necessary to implement that constraint. In practice, if you have a FK for example KEY key_name (user_id), CONSTRAINT foreign_key_constraint_name FOREIGN KEY (user_id) REFERENCES auth_user (id) then you might additionally want to specify what INDEX is used (HASH vs BTREE). This example shows KEY...
Error: Tablespace for table xxx exists. Please DISCARD the tablespace before IMPORT
...h the exact same name I got a message saying that the table already exists(for which I deleted the .idb file)...after the above action a new orphaned .idb file was created in the dir...very strange...I really do not know what to assume.
– Dimitris Papageorgiou
...
Maintain aspect ratio of div but fill screen width and height in CSS?
...
Uhm.. thanks for saving me 2 days of work and infinite amount of user frustrations. 1000+ if I could.
– Schoening
Jun 27 '14 at 19:32
...
Refresh Fragment at reload
...t_TAG is the name you gave your fragment when you created it
This code is for support library.
If you're not supporting older devices, just use getFragmentManager instead of getSupportFragmentManager
[EDIT]
This method requires the Fragment to have a tag.
In case you don't have it, then @Hammer'...
Mail multipart/alternative vs multipart/mixed
...lenge today and I found these answers useful but not quite explicit enough for me.
Edit: Just found the Apache Commons Email that wraps this up nicely, meaning you don't need to know below.
If your requirement is an email with:
text and html versions
html version has embedded (inline) images
at...
How do I make a composite key with SQL Server Management Studio?
... I would downvote this but then I realised the OP specifically asked for how to do it in SSMS. You should always script database changes + if you use tools like this, you'll never learn how to do the changes for yourself
– JonnyRaa
Apr 15 '15 at 15:45
...
Long-lasting FB access-token for server to pull FB page info
...does not expire (with help from @Igy), here is a clear, step-by-step quide for all those looking to the same:
Make sure you are the admin of the FB page you wish to pull info from
Create a FB App (should be with the same user account that is the page admin)
Head over to the Facebook Graph API Expl...
How do you change text to bold in Android?
...
For case where you are using custom fonts, but do not have bold typeface for the font you can use:
myTextView.setText(Html.fromHtml("<b>" + myText + "</b>");
...
Merge two (or more) lists into one, in C# .NET
...2);
allProducts.AddRange(productCollection3);
(AddRange is special-cased for ICollection<T> for efficiency.)
I wouldn't take this approach unless you really have to though.
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