大约有 44,000 项符合查询结果（耗时：0.0508秒） [XML]
Android OnClickListener - identify a button
...public class Mtest extends Activity {
Button b1;
Button b2;
public void onCreate(Bundle savedInstanceState) {
...
b1 = (Button) findViewById(R.id.b1);
b2 = (Button) findViewById(R.id.b2);
b1.setOnClickListener(myhandler1);
b2.setOnClickListener(myhandler2);
...
}
Vi...
Insert into a MySQL table or update if exists
...
Use INSERT ... ON DUPLICATE KEY UPDATE
QUERY:
INSERT INTO table (id, name, age) VALUES(1, "A", 19) ON DUPLICATE KEY UPDATE
name="A", age=19
share
|
improve this answer
|
...
The JPA hashCode() / equals() dilemma
...Read this very nice article on the subject: Don't Let Hibernate Steal Your Identity.
The conclusion of the article goes like this:
Object identity is deceptively hard to implement correctly when
objects are persisted to a database. However, the problems stem
entirely from allowing objects t...
How does data binding work in AngularJS?
...racts with your app, every single watcher in your app will be evaluated at least once. A big part of optimising an AngularJS app is reducing the number of watchers in your $scope tree. One easy way to do this is with one time binding.
If you have data which will rarely change, you can bind it only o...
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>
...
A migration to add unique constraint to a combination of columns
...
The problem with the model level validation is that it doesn't scale. Two servers could run the same data through at the same time (like a double tap on an api heavy app) I have two identical records in my DB right now and the model has the validation..
...
Drop a temporary table if it exists
... IF EXISTS ##CLIENTS_KEYWORD
On previous versions you can use
IF OBJECT_ID('tempdb..##CLIENTS_KEYWORD', 'U') IS NOT NULL
/*Then it exists*/
DROP TABLE ##CLIENTS_KEYWORD
CREATE TABLE ##CLIENTS_KEYWORD
(
client_id INT
)
You could also consider truncating the table instead rather than dropping ...
How to get WordPress post featured image URL
...t me know if it works for you.
<?php if (has_post_thumbnail( $post->ID ) ): ?>
<?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' ); ?>
<div id="custom-bg" style="background-image: url('<?php echo $image[0]; ?>')"&g...
View/edit ID3 data for MP3 files
What's a quick and easy way to view and edit ID3 tags (artist, album, etc.) using C#?
6 Answers
...
Rails auto-assigning id that already exists
...
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(...