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sql “LIKE” equivalent in django query
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In order to preserve the order of the words as in the sql LIKE '%pattern%' statement I use iregex, for example:
qs = table.objects.filter(string__iregex=pattern.replace(' ', '.*'))
string methods are immutable so your pattern...
Database sharding vs partitioning
...itioning. Partition pruning can often improve query performance by several orders of magnitude. For example, suppose an application contains an Orders table containing a historical record of orders, and that this table has been partitioned by week. A query requesting orders for a single week would o...
Drop all tables whose names begin with a certain string
...My solution below avoids this and deletes tables in foreign key dependency order.
– Tony O'Hagan
Jul 19 '15 at 1:15
Th...
How to check Oracle database for long running queries
... s.sql_hash_value
and s.status = 'ACTIVE'
and s.username <> 'SYSTEM'
order by s.sid,t.piece
/
This shows locks. Sometimes things are going slow, but it's because it is blocked waiting for a lock:
select
object_name,
object_type,
session_id,
type, -- Type or system/user l...
C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...（在线执行）：
#include <atomic>
#include <memory>
#include <unordered_set>
template <class T>
struct HazardPointer {
public:
class Holder {
public:
explicit Holder(HazardPointer<T> *pointer) : pointer_(pointer) {}
Holder(const HazardPointer &) = delete;
~Hold...
Reverse colormap in matplotlib
I would like to know how to simply reverse the color order of a given colormap in order to use it with plot_surface.
7 Answ...
Difference between array_push() and $array[] =
In the PHP manual, ( array_push ) says..
9 Answers
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Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...一个Key Value的数据结构，它很像Javascript中的Object，或是PHP中的数组，在别的语言里叫Dict或Map，Table长成这个样子：
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haoel = {name="ChenHao", age=37, handsome=True}
下面是table的CRUD操作：
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Tutorials and libraries for OpenGL-ES games on Android [closed]
...d create a free version of the game on the market - after which I cannot really sell my app, I can only give people an opportunity to support it. This is possible on Android because Google has virtually no restrictions on the market (which is good). On the iPhone market it might be different, becaus...
.htaccess redirect all pages to new domain
Which redirect rule would I use to redirect all pages under olddomain.example to be redirected to newdomain.example ?
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