大约有 9,000 项符合查询结果（耗时：0.0306秒） [XML]
What does collation mean?
What does collation mean in SQL, and what does it do?
9 Answers
9
...
How to add 'ON DELETE CASCADE' in ALTER TABLE statement
...
Just tested in SqlServer, but possible you have to chance go with semi-colon as in postgres and SqlServer itself. But the remain core codes are sql standar. Test with semi-colons, I just changed it
– David Silva-Barrer...
Limiting the number of records from mysqldump?
...
As skaffman says, use the --where option:
mysqldump --opt --where="1 limit 1000000" database
Of course, that would give you the first million rows from every table.
share
|
...
How should a model be structured in MVC? [closed]
...me, Domain Objects are completely unaware of storage - neither from where (SQL database, REST API, text file, etc.) nor even if they get saved or retrieved.
Data Mappers
These objects are only responsible for the storage. If you store information in a database, this would be where the SQL lives. Or...
Inner join vs Where
... I find it much easier to comprehend FOR INNER JOINS than the SQL-92 syntax. Your mileage may vary.
– Craig Trader
Sep 23 '08 at 17:39
27
...
Closing Database Connections in Java
...t ps = null;
ResultSet rs = null;
try {
// Do stuff
...
} catch (SQLException ex) {
// Exception handling stuff
...
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) { /* ignored */}
}
if (ps != null) {
try {
...
Update a record without first querying?
...
You can also use direct SQL against the database using the context of the datastore. Example:
dataEntity.ExecuteStoreCommand
("UPDATE items SET itemstatus = 'some status' WHERE id = 123 ");
For performance reasons, you may want to pass in var...
关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...来看以不同io模型来实现一个socket（io） server的功能
1、使用 accept 阻塞的古老模型：属于同步阻塞 IO 模型，代码如下：
socket_server.php
<?php
/**
* SocketServer Class
* By James.Huang <shagoo#gmail.com>
**/
set_time_limit(0);
class Socket...
How Scalable is SQLite? [closed]
I recently read this Question about SQLite vs MySQL and the answer pointed out that SQLite doesn't scale well and the official website sort-of confirms this , however.
...
MySQL Query GROUP BY day / month / year
...ord_date), MONTH(record_date)
Check out the date and time functions in MySQL.
share
|
improve this answer
|
follow
|
...