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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
...践
主题命名规范：
{namespace}/{device_type}/{device_id}/{attribute}/{action}
示例：
home/thermostat/livingroom/temperature/set
office/light/meeting_room/brightness/get
factory/sensor/machine_001/status/online
通配符使用规则：
// 单级通配符匹配
call UrsPahoM...
Android: Go back to previous activity
I want to do something simple on android app.
How is it possible to go back to a previous activity.
23 Answers
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How to strip all non-alphabetic characters from string in SQL Server?
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I knew that SQL was bad at string manipulation, but I didn't think it would be this difficult. Here's a simple function to strip out all the numbers from a string. There would be better ways to do this, but this is a start.
CREATE FUNCTION dbo.AlphaOnly (
@String varchar(100...
Routing with Multiple Parameters using ASP.NET MVC
...d we are thinking about using ASP.NET MVC. While designing our API, we decided to use calls like the one below for the user to request information from the API in XML format:
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Populating a database in a Laravel migration file
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Don't put the DB::insert() inside of the Schema::create(), because the create method has to finish making the table before you can insert stuff. Try this instead:
public function up()
{
// Create the table
Schema::create('users', function($table)...
LINQ Single vs First
...table that stores Customers in different languages using a Composite Key ( ID, Lang ):
DBContext db = new DBContext();
Customer customer = db.Customers.Where( c=> c.ID == 5 ).First();
This code above introduces a possible logic error ( difficult to trace ). It will return more than one record ( ...
React JSX: selecting “selected” on selected option
...ist.List is opening but when i select one of them it select value item.Any idea ?
– user1924375
May 2 '15 at 17:59
5
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How to get HTTP Response Code using Selenium WebDriver
...lenium2/WebDriver and want to test if HTTP Request returns an HTTP 403 Forbidden.
9 Answers
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How can I shrink the drawable on a button?
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You should use a ImageButton and specify the image in android:src, and set android:scaletype to fitXY
Setting scaled drawable in code
Drawable drawable = getResources().getDrawable(R.drawable.s_vit);
drawable.setBounds(0, 0, (int)(drawable.getIntrinsicWidth()*0.5),
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Label on the left side instead above an input field
... would like to have the labels not above the input field, but on the left side.
15 Answers
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