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When to Redis? When to MongoDB? [closed]
...licity, much shorter learning curve for developers with traditional DB and SQL experience. However, Redis's non-traditional approach requires more effort to learn, but greater flexibility.
Eg. A cache layer can probably be better implemented in Redis. For more schema-able data, MongoDB is better. ...
Get Insert Statement for existing row in MySQL
Using MySQL I can run the query:
15 Answers
15
...
SQLAlchemy default DateTime
...should be an input to the Column function. Try this:
import datetime
from sqlalchemy import Column, Integer, DateTime
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Test(Base):
__tablename__ = 'test'
id = Column(Integer, primary_key=True)
crea...
Storing Images in DB - Yea or Nay?
... Are you, by chance, using the ImageResizing.Net library to handle your SQL->disk image caching? It's the most advanced, scalable, and robust disk cache you can get...
– Lilith River
Aug 15 '11 at 21:13
...
Delete sql rows where IDs do not have a match from another table
I'm trying to delete orphan entries in a mysql table.
3 Answers
3
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Repository Pattern Step by Step Explanation [closed]
...objects, is safely contained in the repository.
Very often, you will find SQL queries scattered in the codebase and when you come to add a column to a table you have to search code files to try and find usages of a table. The impact of the change is far-reaching.
With the repository pattern, you w...
JPA or JDBC, how are they different?
...d for ORM
JDBC is a standard for connecting to a DB directly and running SQL against it - e.g SELECT * FROM USERS, etc. Data sets can be returned which you can handle in your app, and you can do all the usual things like INSERT, DELETE, run stored procedures, etc. It is one of the underlying tec...
Using a .php file to generate a MySQL dump
...he output to the PHP script -- no need for the PHP script to get the whole SQL dump as a string : you only need it written to a file, and this can be done by the command itself.
That external command will :
be a call to mysqldump, with the right parameters,
and redirect the output to a file.
...
Entity Framework with NOLOCK
... READ UNCOMMITTED;");
http://msdn.microsoft.com/en-us/library/aa259216(v=sql.80).aspx
With this technique, we were able to create a simple EF provider that creates the context for us and actually runs this command each time for all of our context so that we're always in "read uncommitted" by defa...
Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...撑的连接数个数，而并非qps，当然qps也是我们需要考虑的性能点之一。这种应用常见于消息推送系统，也称为comet应用，比如聊天室或即时消息推送系统等。comet应用具体可见我之前的介绍，在此不多讲。对于这类系统，因为很...