Execute an SQL statement each time DB connection is set up


#1

Hi everyone.

I need to execute a “SET SQL_MODE=‘STRICT_ALL_TABLES’” after my
application’s DB connection is established by AcriveRecord. This is
important since I want the DB itself be more strict about logical data
integrity.

Which is the proper place within application code from where I can issue
this query?

Tried to make an ActiveRecord::Base.connection.execute() in an
initializer, but it only runs once after server startup. At next request
the connection is re-created, but initializers aren’t invoked.

Alex


#2

Alex F.una wrote:

initializer, but it only runs once after server startup. At next request
the connection is re-created, but initializers aren’t invoked.

In 2.2.2 there doesn’t seem to be a callback when a connection
is established & re-established, so try an initializer like

ActiveRecord::ConnectionAdapters::MysqlAdaptor.class_eval do
private
def connect_with_strict
connect_without_strict
execute “SET SQL_MODE=‘STRICT_ALL_TABLES’”
end
alias_method_chain :connect, :strict
end


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#3

On Wed, Feb 18, 2009 at 7:15 PM, Alex F.una <
removed_email_address@domain.invalid> wrote:

Tried to make an ActiveRecord::Base.connection.execute() in an
initializer, but it only runs once after server startup. At next request
the connection is re-created, but initializers aren’t invoked.

Hi Alex, STRICT_ALL_TABLES is an option that one would set on a
database.
Thus, why don’t you set it when you create the database?

-Conrad


#4

Conrad T. wrote:

Hi Alex, STRICT_ALL_TABLES is an option that one would set on a
database.
Thus, why don’t you set it when you create the database?

Conrad,

AFAIK, SQL_MODE applies to connection, not DB itself. I.e. it’s not
the same as, for example, DB engine or collation mode.

Consider (from ‘script/server’ log):

SQL (0.2ms) SET NAMES ‘utf8’

Well, what I need is almost similar. What Mark proposed above seems
closer to what I need.

It has never been a problem in less sophisticated environments. Just
issue a bunch of “SET *” command after every connection and feel good.

Alex