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What's wrong with nullable columns in composite primary keys?
...
Primary keys are for uniquely identifying rows. This is done by comparing all parts of a key to the input.
Per definition, NULL cannot be part of a successful comparison. Even a comparison to itself (NULL = NULL) will fail. This means a key contai...
Access object child properties using a dot notation string [duplicate]
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//-> 99
Although there are answers that extend this to "allow" array index access, that's not really necessary as you can just specify numerical indexes using dot notation with this method:
getDescendantProp({ a: [ 1, 2, 3 ] }, 'a.2');
//-> 3
...
How to mock the Request on Controller in ASP.Net MVC?
... rq["Age"]).Returns("2001");
Usage in Controller :
public ActionResult Index()
{
var age = Request["Age"]; //This will return 2001
}
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Disable/enable an input with jQuery?
... your code:
$.prototype.enable = function () {
$.each(this, function (index, el) {
$(el).removeAttr('disabled');
});
}
$.prototype.disable = function () {
$.each(this, function (index, el) {
$(el).attr('disabled', 'disabled');
});
}
And then you can write stuff li...
Can you get the column names from a SqlDataReader?
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There is a GetName function on the SqlDataReader which accepts the column index and returns the name of the column.
Conversely, there is a GetOrdinal which takes in a column name and returns the column index.
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Insert spaces between words on a camel-cased token [duplicate]
...s between the case changes)
string strOutput = "";
// The index of the current character in the input string
int intCurrentCharPos = 0;
// The index of the last character in the input string
int intLastCharPos = strInput.Length - 1;
// for every cha...
Can I apply the required attribute to fields in HTML5?
...at the user selects something.
In Javascript, you can check the selectedIndex property to get the index of the selected option, or you can check the value property to get the value of the selected option.
According to the HTML5 spec, selectedIndex "returns the index of the first selected item, i...
Why am I getting an OPTIONS request instead of a GET request?
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I had the same problem. My fix was to add headers to my PHP script which are present only when in dev environment.
This allows cross-domain requests:
header("Access-Control-Allow-Origin: *");
This tells the preflight request that it is OK for the client to send any headers it ...
Where is body in a nodejs http.get response?
...atically.
var options = {
host: 'www.google.com',
port: 80,
path: '/index.html'
};
http.get(options, function(res) {
console.log("Got response: " + res.statusCode);
res.on("data", function(chunk) {
console.log("BODY: " + chunk);
});
}).on('error', function(e) {
console.log("Got ...
MLKitFaceMesh 拓展：面部网格（468 个关键点） · App Inventor 2 中文网
...age
}
点的 JSON 形状（用「JSON 文本解码」块解析）：
[{"index":33,"x":123.4,"y":56.7,"z":-12.3},
{"index":34,"x":126.1,"y":57.2,"z":-12.0}]
x/y 是原图像素坐标，z 是相对深度（越小越靠近镜头）。
二、同一次检测取多个区域（不用重新...