大约有 3,610 项符合查询结果（耗时：0.0173秒） [XML]
Foreign Key to multiple tables
...
I am really new to SQL so correct me if this is wrong, but this design seems to be an approach to use when you are extremely confident that you will only need two owner types of a ticket. Down the road if a third ticket owner type were introduc...
Replace Line Breaks in a String C#
...actual newlines may not match. This happened to me why processing returned SQL. The new lines were \n, while Environment.NewLine was \r\n. The result was that nothing was matched so the new lines remained.
– Dono
Oct 2 '13 at 3:06
...
Fluent and Query Expression — Is there any benefit(s) of one over other?
...th worlds by mixing query and method syntax. This is often done in LINQ to SQL queries:
var query =
from c in db.Customers
let totalSpend = c.Purchases.Sum (p => p.Price) // Method syntax here
where totalSpend > 1000
from p in c.Purchases
select new { p.Description, totalSpend, c...
搭建高可用mongodb集群（一）——配置mongodb - 大数据 & AI - 清泛网 - 专...
...可扩展性和高可用性这些难题。不过就是因为这些问题Nosql诞生了。
NOSQL有这些优势：
大数据量，可以通过廉价服务器存储大量的数据，轻松摆脱传统mysql单表存储量级限制。
高扩展性，Nosql去掉了关系数据库的关系型特性，...
psql: FATAL: database “” does not exist
I'm using the PostgreSql app for mac ( http://postgresapp.com/ ). I've used it in the past on other machines but it's giving me some trouble when installing on my macbook. I've installed the application and I ran:
...
How to become an OpenCart guru? [closed]
...xtra methods the $this->db object has
$this->db->escape() uses mysql_real_escape_string() on the value passed
$this->db->countAffected returns the number of rows affected by an UPDATE query and so on
$this->db->getLastId() returns the last auto increment id using mysql_insert...
Working with huge files in VIM
...
I had the same problem, but it was a 300GB mysql dump and I wanted to get rid of the DROP and change CREATE TABLE to CREATE TABLE IF NOT EXISTS so didn't want to run two invocations of sed. I wrote this quick Ruby script to dupe the file with those changes:
#!/usr/bin...
Setting unique Constraint with fluent API?
... Unique Constraint. I was seeing old posts that suggested executing native SQL commands for this, but that seem to defeat the purpose. is this possible with EF6?
...
How to disable Golang unused import error
...e is an example of how you could use it:
import (
"log"
"database/sql"
_ "github.com/go-sql-driver/mysql"
)
To import a package solely for its side-effects (initialization), use
the blank identifier as explicit package name.
View more at https://golang.org/ref/spec#Import_decl...
JPA eager fetch does not join
...not necessarily dictate how the fetch statement is constructed, the actual sql implementation depends on the provider you are using toplink/hibernate etc.
If you set fetchType=EAGER This means that the annotated field is populated with its values at the same time as the other fields in the entity. ...