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How do I create a URL shortener?
...n auto-generated, unique numerical key (the auto-incremented id of a MySQL table for example).
For this example, I will use 12510 (125 with a base of 10).
Now you have to convert 12510 to X62 (base 62).
12510 = 2×621 + 1×620 = [2,1]
This requires the use of integer division and modulo. A pseudo...
OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
...个session
1.1 从IO线程的client_list(easy_hash_t)这个hash table中找出一个easy_client_t(封装一个connection的发起端)，对端地址是session->addr
1.2 如果要发送的session是一个正常的session，则设置其回调函数process后，返回这个client封...
JPA or JDBC, how are they different?
...I used EntityManager and with the get methods could access the stored data table.
4 Answers
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How Do I Get the Query Builder to Output Its Raw SQL Query as a String?
...
Use the toSql() method on a QueryBuilder instance.
DB::table('users')->toSql() would return:
select * from `users`
This is easier than wiring up an event listener, and also lets you check what the query will actually look like at any point while you're building it.
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Why does PostgreSQL perform sequential scan on indexed column?
Very simple example - one table, one index, one query:
4 Answers
4
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How to get a reference to current module's attributes in Python
...obals() — Return a dictionary
representing the current global symbol
table. This is always the dictionary
of the current module (inside a
function or method, this is the module
where it is defined, not the module
from which it is called).
http://docs.python.org/library/functions.html...
Condition within JOIN or WHERE
...in join improve performance for large amount of data with properly indexed tables.
– Shahdat
Oct 6 '16 at 15:13
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What is the difference between vmalloc and kmalloc?
...ral virtual-to-physical address mappings will have to be added to the page table. And in the worst case, there will be (size of buffer/page size) number of mappings added to the page table.
This also adds pressure on TLB (the cache entries storing recent virtual to physical address mappings) when a...
Postgres manually alter sequence
... ALTER SEQUENCE [sequence] RESTART WITH (SELECT MAX(col) from table); does not work, whereas SELECT setval('sequence', (SELECT (MAX(col) from table), TRUE); does work. I get a syntax error. (Postgres 9.4)
– NuclearPeon
Jul 21 '18 at 1:35
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How can I get dict from sqlite query?
... dictionaries, each item in list(each dictionary)
#represents a row of the table
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