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Transaction isolation levels relation with locks on table
...B just executes a SELECT statement to read data. C reads and updates data. All these process work on the same table T.
READ UNCOMMITTED - no lock on the table. You can read data in the table while writing on it. This means A writes data (uncommitted) and B can read this uncommitted data and use it...
How to reload a clojure file in REPL
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:reload-all should also work. The OP specifically says it doesn't, but I think there was something else wrong in the OP's dev environment because for a single file the two (:reload and :reload-all) should have the same effect. Here'...
PHP Session Fixation / Hijacking
...cker explicitly sets the session identifier of a session for a user. Typically in PHP it's done by giving them a url like http://www.example.com/index...?session_name=sessionid. Once the attacker gives the url to the client, the attack is the same as a session hijacking attack.
There are a few way...
Original purpose of ? [closed]
...purpose today because HTTP as we know it today is still, at least fundamentally, a stateless protocol.
This use case was actually first described in HTML 3.2 (I'm surprised HTML 2.0 didn't include such a description):
type=hidden
These fields should not be rendered and provide a means for servers t...
What is the “FS”/“GS” register intended for?
...dows and Linux.
The original intention behind the segment registers was to allow a program to access many different (large) segments of memory that were intended to be independent and part of a persistent virtual store. The idea was taken from the 1966 Multics operating system, that treated files a...
Rails find_or_create_by more than one attribute?
There is a handy dynamic attribute in active-record called find_or_create_by:
5 Answers
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Is git's semi-secret empty tree object reliable, and why is there not a symbolic name for it?
...0 +0000" GIT_COMMITTER_DATE="Thu, 01 Jan 1970 00:00:00 +0000" git commit --allow-empty -m 'Initial commit'
Will give you:
(See the tree SHA1?)
You can even rebase your existing history on top of that empty commit (see "git: how to insert a commit as the first, shifting all the others?")
In bo...
How to call Stored Procedure in Entity Framework 6 (Code-First)?
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You can call a stored procedure in your DbContext class as follows.
this.Database.SqlQuery<YourEntityType>("storedProcedureName",params);
But if your stored procedure returns multiple result sets as your sample code, then you...
Java switch statement: Constant expression required, but it IS constant
....4 Final Variables which defines a "constant variable" as follows:
We call a variable, of primitive type or type String, that is final and initialized with a compile-time constant expression (§15.28) a constant variable. Whether a variable is a constant variable or not may have implications wit...
wandbox：C++在线编译项目源码编译及原理剖析 - 开源 & Github - 清泛网 - ...
...源码编译步骤：
1、clone到本地后，首先必须执行 ./install_deps.sh 安装依赖包。
2、中间可能安装失败，再次执行他会重新开始，可以适量修改install_deps.sh脚本，仅重新安装失败的。依赖包自动下载源码安装，安装在_install目录下...