大约有 500 项符合查询结果（耗时：0.0065秒） [XML]
ActiveRecord OR query
...ys as arguments, the following code works in Rails 4:
query = Order.where(uuid: uuids, id: ids)
Order.where(query.where_values.map(&:to_sql).join(" OR "))
#=> Order Load (0.7ms) SELECT "orders".* FROM "o
Difference between __str__ and __repr__?
...
This is true because for obj = uuid.uuid1(), obj.__str__() is "2d7fc7f0-7706-11e9-94ae-0242ac110002" and obj.__repr__() is "UUID('2d7fc7f0-7706-11e9-94ae-0242ac110002')". Developers need (value + origin) whereas customers need a value and they don't care h...
Create a unique number with javascript time
...presentation, not sure though, but i can see the problem, if you call your uuid generator often enough, only last 3 chars are changing so the chances are high that you will get into a collision. You get much better odds if you just stick to new Date.getTime() calls. But hey if it worked for your pur...
Check if value exists in Postgres array
... value exists or not is as simple as using IN or NOT IN.
e.g.
id => uuid
exception_list_ids => uuid[]
select * from table where id NOT IN (select unnest(exception_list_ids) from table2)
share
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How can I remove specific rules from iptables?
...d temporary rule with some comment:
comment=$(cat /proc/sys/kernel/random/uuid | sed 's/\-//g')
iptables -A ..... -m comment --comment "${comment}" -j REQUIRED_ACTION
2. When the rule added and you wish to remove it (or everything with this comment), do:
iptables-save | grep -v "${comment}" | ip...
An operation on a socket could not be performed because the system lac...
...em-lacked-sufficient-buffer-space服务端程序崩溃重启，查看日志报错：An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作。)服务端程序崩...
An operation on a socket could not be performed because the system lac...
...em-lacked-sufficient-buffer-space服务端程序崩溃重启，查看日志报错：An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作。)服务端程序崩...
An operation on a socket could not be performed because the system lac...
...em-lacked-sufficient-buffer-space服务端程序崩溃重启，查看日志报错：An operation on a socket could not be performed because the system lacked sufficient buffer space(由于系统缓冲区空间不足，或者因为队列已满，不能执行套接字上的操作。)服务端程序崩...
C++的内部类 - C/C++ - 清泛网 - 专注C/C++及内核技术
C++的内部类标准C：不能访问内部类的private成员。但编译器编译能通过且不报错。标准C：不能访问内部类的private成员。
但编译器编译能通过且不报错。C++ 内部类
warning RC2182: duplicate dialog control ID 1002 - C/C++ - 清泛网 - 专注C/C++及内核技术
warning RC2182: duplicate dialog control ID 1002原因：报错行的控件ID值（这里是1002），与其他的控件ID值一样，发生冲突了。解决：resource.h中将值一样的控件ID改为不同的值。原因：报错行的控件ID值（这里是1002），与其他的控件ID值一...