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快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...言，我才实盘测试交易15个交易日，我也不知道每月收益如何。按照估算，20万的实盘账户，每月稳定有净利润5000元以上（即，年收益大约30%以上，权益回撤不超过10%），同时，产生的手续费比净利润略低些，大约是净利润的9成...
PostgreSQL create table if not exists
In a MySQL script you can write:
6 Answers
6
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How can I have ruby logger log output to stdout as well as file?
...can do:
# config/environment/production.rb
file_logger = Logger.new(Rails.root.join("log/alternative-output.log"))
config.logger.extend(ActiveSupport::Logger.broadcast(file_logger))
Or if you're on Rails 3, you can backport it:
# config/initializers/alternative_output_log.rb
# backported from r...
What is event bubbling and capturing?
...
Bubbling
Event propagate to the upto root element is **BUBBLING**.
Capturing
Event propagate from body(root) element to eventTriggered Element is **CAPTURING**.
How to make connection to Postgres via Node.js
... - I use Node-DBI to connect to PG, but also due to the ability to talk to MySQL and sqlite. Node-DBI also includes functionality to build a select statement, which is handy for doing dynamic stuff on the fly.
Quick sample (using config information stored in another file):
var DBWrapper = require...
.gitignore exclude folder but include specific subfolder
...attern you can leverage for a bit more shorthand solution:
# assuming the root folder you want to ignore is 'application'
application/**/*
# the subfolder(s) you want to track:
!application/language/gr/
This way you don't have to "unignore" parent directory of the subfolder you want to track.
...
How can I join multiple SQL tables using the IDs?
...
Not the answer you're looking for? Browse other questions tagged mysql sql join or ask your own question.
How to call a stored procedure from Java and JPA
...stgreSQL functions (stored procedures) with JPA and Hibernate
How to call MySQL stored procedures and functions with JPA and Hibernate
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Handle Guzzle exception and get HTTP body
...items.
Side Notes:
With catch clause we catch the inheritance chain PHP root exception class
\Exception as Guzzle custom exceptions extend it.
This approach may be useful for use cases where Guzzle is used under the hood like in Laravel or AWS API PHP SDK so you cannot catch the genuine Guzzle e...
Revert the `--no-site-packages` option with virtualenv
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At least for Python 3.5.2, there is pyvenv.cfg file in the root of virtualenv directory. All you need to do is to change include-system-site-packages flag from false to true:
home = /usr/bin
include-system-site-packages = false # <- change this to "true"
version = 3.5.2
...