大约有 18,400 项符合查询结果（耗时：0.0325秒） [XML]
Using async/await for multiple tasks
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int[] ids = new[] { 1, 2, 3, 4, 5 };
Parallel.ForEach(ids, i => DoSomething(1, i, blogClient).Wait());
Although you run the operations in parallel with the above code, this code blocks each thread that each operation runs on. ...
INSERT IF NOT EXISTS ELSE UPDATE?
...ang_conflict.html.
You want something like:
insert or replace into Book (ID, Name, TypeID, Level, Seen) values
((select ID from Book where Name = "SearchName"), "SearchName", ...);
Note that any field not in the insert list will be set to NULL if the row already exists in the table. This is why ...
Rails auto-assigning id that already exists
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Rails is probably using the built-in PostgreSQL sequence. The idea of a sequence is that it is only used once.
The simplest solution is to set the sequence for your company.id column to the highest value in the table with a query like this:
SELECT setval('company_id_seq', (SELECT max(...
.Contains() on a list of custom class objects
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You need to implement IEquatable or override Equals() and GetHashCode()
For example:
public class CartProduct : IEquatable<CartProduct>
{
public Int32 ID;
public String Name;
public Int32 Number;
public Decimal CurrentPrice;
public CartP...
Converting an array of objects to ActiveRecord::Relation
...jiSaini I’m unsure of the exact method you’re referring to, please provide doc or source link. Though, if it’s deprecated, not a very viable solution as it’ll likely go away soon.
– Andrew Marshall
Feb 14 '17 at 14:09
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Sequence contains no elements?
...point on that line, or a Debug.Print before it, in both cases and see what ID contains.
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Android: Test Push Notification online (Google Cloud Messaging) [closed]
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Found a very easy way to do this.
Open http://phpfiddle.org/
Paste following php script in box. In php script set API_ACCESS_KEY, set device ids separated by coma.
Press F9 or click Run.
Have fun ;)
<?php
// API access key from Google API's Console
define( 'API_ACCE...
Clicking the text to select corresponding radio button
...you've got a label on the form itself. You want to put labels on each individual radio group, as shown below.
<form>
<p>What is my middle name?</p>
<br>
<input id="349" type="radio" value="1" name="question1">
<label for="349">Abe</label>
...
Add new item count to icon on button - Android
... TextView as an XML <shape> drawable, with which you can create a solid or gradient circle with a border. An XML drawable will scale to fit the view as it resizes with more or less text.
res/drawable/badge_circle.xml:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
an...
How can I shift-select multiple checkboxes like GMail?
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<head>
</head>
<body>
<input type="checkbox" id="id_chk1" class="chkbox" value="1" />Check 1<br/>
<input type="checkbox" id="id_chk2" class="chkbox" value="2" />Check 2<br/>
<input type="checkbox" id="id_chk3" class="chkbox" value="3" /...