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ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
... that. One common scenario is that you've tested the update in a tool, say SQL Developer or Toad, and have then tried to run it somewhere else while the first session still holds the lock. So you need to commit/rollback the other session before you can run the update again.
– A...
How can I alter a primary key constraint using SQL syntax?
...ing a column in its primary key constraint. Instead of editing it through SQL Server, I want to put this in a script to add it as part of our update scripts.
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Get Insert Statement for existing row in MySQL
Using MySQL I can run the query:
15 Answers
15
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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
...
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...
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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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...
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...
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...
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.
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