大约有 40,000 项符合查询结果（耗时：0.0475秒） [XML]
CHECK constraint in MySQL is not working
...the first version that supports CHECK constraints.
Read https://dev.mysql.com/doc/refman/8.0/en/create-table-check-constraints.html
If you use MySQL 8.0.15 or earlier, the MySQL Reference Manual says:
The CHECK clause is parsed but ignored by all storage engines.
Try a trigger...
mysql>...
How do I recursively delete a directory and its entire contents (files + sub dirs) in PHP?
...one gave me for the same question: glob seems to work nicer: stackoverflow.com/questions/11267086/…
– NoodleOfDeath
Aug 10 '12 at 17:09
...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
...;
Instead of calling android:id, the xml will use http://schemas.android.com/apk/res/android:id to be unique. Generally this page doesn't exist (it's a URI, not a URL), but sometimes it is a URL that explains the used namespace.
The namespace has pretty much the same uses as the package name in a...
What is the difference between angular-route and angular-ui-router?
... the normal ngRoute can do as well as many extra functions.
Here are some common reason ui-router is chosen over ngRoute:
ui-router allows for nested views and multiple named views. This is very useful with larger app where you may have pages that inherit from other sections.
ui-router allows fo...
How to get an object's property's value by property name?
...
|
show 1 more comment
45
...
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
... >
Inside the TCP stack, these four fields are used as a compound key to match up packets to connections (e.g. file descriptors).
If a client has many connections to the same port on the same destination, then three of those fields will be the same - only source_port varies to diff...
How to get visitor's location (i.e. country) using geolocation? [duplicate]
...
add a comment
|
192
...
Google Maps v3 - limit viewable area and zoom level
...
<script type="text/javascript"
src="http://maps.google.com/maps/api/js?sensor=false"></script>
</head>
<body>
<div id="map" style="width: 400px; height: 300px;"></div>
<script type="text/javascript">
// This is the minimum zoo...
How can I convert an image into Base64 string using JavaScript?
...
|
show 4 more comments
890
...
How to duplicate a git repository? (without forking)
...
See https://help.github.com/articles/duplicating-a-repository
Short version:
In order to make an exact duplicate, you need to perform both a bare-clone and a mirror-push:
mkdir foo; cd foo
# move to a scratch dir
git clone --bare https://github...