大约有 37,000 项符合查询结果（耗时：0.0342秒） [XML]
When would you use delegates in C#? [closed]
... is extremely handy (although the example is a little contrived).
string sTableName = "test";
string sQuery = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='" + sTableName + "'";
DataProvider.UseReader( sQuery,
delegate( System.Data.IDataReader reader )
{
Con...
MySQL - ORDER BY values within IN()
...
SELECT id, name
FROM mytable
WHERE name IN ('B', 'A', 'D', 'E', 'C')
ORDER BY FIELD(name, 'B', 'A', 'D', 'E', 'C')
The FIELD function returns the position of the first string in the remaining list of strings.
However, it is much better performan...
INSERT INTO … SELECT FROM … ON DUPLICATE KEY UPDATE
...ith MySQL 5.6.6, an INSERT ... ON DUPLICATE KEY UPDATE statement against a table having more than one unique or primary key is also marked as unsafe.`
– Abdul Muneer
Aug 10 '15 at 5:53
...
Display milliseconds in Excel
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I've discovered in Excel 2007, if the results are a Table from an embedded query, the ss.000 does not work. I can paste the query results (from SQL Server Management Studio), and format the time just fine. But when I embed the query as a Data Connection in Excel, the format al...
Adding a column to a data.frame
...number of groups (x in mapply) and its length (y in mapply)
mytb<-read.table(text="h_no h_freq h_freqsq group
1 0.09091 0.008264628 1
2 0.00000 0.000000000 1
3 0.04545 0.002065702 1
4 0.00000 0.000000000 1
1 0.13636 0.018594050 2
2 0.00000 0.000000000 2
3 0.00000 ...
Disable messages upon loading a package
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not really, try library(data.table, quietly = TRUE)
– Gaurav Singhal
Jul 2 '18 at 8:40
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For loop for HTMLCollection elements
...erable performance or memory drawbacks. For example if I need to iterate a table row's cells I use a [...row.cells].forEach instead of doing a row.querySelectorAll('td')
– Mojimi
Oct 15 '19 at 13:18
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Entity Framework: How to disable lazy loading for specific query?
... Much more useful answer. This controls the specific sub-ordinate tables that are loaded at the point where the query is being constructed. For any real world problem this has to be the way to go.
– Richard Petheram
Jul 2 '18 at 7:18
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How to sort findAll Doctrine's method?
... must tell your entity to look for queries in the repository:
/**
* @ORM\Table(name="User")
* @ORM\Entity(repositoryClass="Acme\UserBundle\Entity\Repository\UserRepository")
*/
class User
{
...
}
Finally, in your controller:
$this->getDoctrine()->getRepository('AcmeBundle:User')->...
What is the difference between an ORM and an ODM?
...a types so you can mix RDBMS and Document-oriented storage within the same table, including indexes and advanced query!
– Arnaud Bouchez
Jul 4 '14 at 11:21
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