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non-prepared statements
Conflicts:
activerecord/test/cases/query_cache_test.rb
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Conflicts:
activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
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Prepared statements (prepare/execute/close) were being used unnecessarily
when no bind variables were present, and disabling prepared statement using
prepared_statements:false was principally broken. While bind variables were
correctly substituted with prepared_statements:false, the prepared statement
interface was still used, costing an extra two round trips per query.
In addition to making this behavioral change, I also cleaned up the internals
of exec_stmt and exec_without_stmt so that they behave the same (calling log
and constructing the ActiveRecord::Result in the same way).
Moving the check for binds.empty? to exec_query also will mean that several
code paths explicitly calling exec_without_stmt could be cleaned up to once
again call exec_query instead. I have also left the check for binds.empty? in
exec_stmt, since it is not a private method and could be called directly with
an empty binds array. For the sake of clarity in this patch, I have not made
those changes.
= The previous behavior =
When issuing a Foo.find(1) with prepared_statements:true, the bind variable
is present in the prepared query, and execute shows a value passed:
Connect root@localhost on rails_test
Query SET SQL_AUTO_IS_NULL=0
Statistics
Query SHOW FULL FIELDS FROM `foos`
Query SHOW TABLES LIKE 'foos'
Query SHOW CREATE TABLE `foos`
Prepare SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = ? LIMIT 1
Execute SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = 1 LIMIT 1
Close stmt
Quit
When issuing a Foo.find(1) with prepared_statements:false, the bind variable
has already been removed and substituted with the value, but the prepared
statement interface is used anyway:
Connect root@localhost on rails_test
Query SET SQL_AUTO_IS_NULL=0
Statistics
Query SHOW FULL FIELDS FROM `foos`
Query SHOW TABLES LIKE 'foos'
Query SHOW CREATE TABLE `foos`
Prepare SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = 1 LIMIT 1
Execute SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = 1 LIMIT 1
Close stmt
Quit
= With this patch applied =
When issuing a Foo.find(1) with prepared_statements:true, the bind variable
is present in the prepared query, and execute shows a value passed:
Connect root@localhost on rails_test
Query SET SQL_AUTO_IS_NULL=0
Statistics
Query SHOW FULL FIELDS FROM `foos`
Query SHOW TABLES LIKE 'foos'
Query SHOW CREATE TABLE `foos`
Prepare SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = ? LIMIT 1
Execute SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = 1 LIMIT 1
Close stmt
Quit
When issuing a Foo.find(1) with prepared_statements:false, the bind variable
has been removed and substituted with the value, and the query interface is
used instead of the prepared statement interface:
Connect root@localhost on rails_test
Query SET SQL_AUTO_IS_NULL=0
Statistics
Query SHOW FULL FIELDS FROM `foos`
Query SHOW TABLES LIKE 'foos'
Query SHOW CREATE TABLE `foos`
Query SELECT `foos`.* FROM `foos` WHERE `foos`.`id` = 1 LIMIT 1
Quit
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exists in class method.
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Remove duplicated code in the AR::Store.
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The instructions about configuration covered only rails-specific usage.
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Dry up reseting the renamed table after each test.
Also made use of the AR::Base.connection object already
available from AR::MigrationTest#connection.
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Rename default sequence when table is renamed? [AR:postgres]
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AddXXXToYYY/RemoveXXXFromYYY migrations are produced with references
statements, for instance
rails g migration AddReferencesToProducts user:references
supplier:references{polymorphic}
will generate the migration with:
add_reference :products, :user, index: true
add_reference :products, :supplier, polymorphic: true, index: true
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This reverts commit c47a698d5d497340d4e349257522212173865838.
Reason: Let's revert pending further discussions
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Introduced in 75b340d1a4bcf2f1233fb65a15ff6b8059e2230e
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A test was failing due to the way that Relation#inspect causes
association proxies to ignore unsaved records added to the association.
This is fixed by simply calling to_a and letting to_a figure out how to
get the records (which, in the case of associations, takes into account
new records).
I think it is acceptable to do this rather than limiting the query at
the database level:
* It's what we've done in all released Rails versions up to this point
* The goal of the limit is to not flood the console with output - this
is the problem we're targeting, rather than the actual loading of the
records from the database
* You probably want to do something with those records later anyway,
otherwise you wouldn't have built a relation for them.
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Allow to register database tasks from different adapters
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relation
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Engine table name prefix generator fix
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Added *instance_writer: false* to stored/serialized attributes.
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While it's interesting to have the results array, it can make a console or a webpage freeze if there are a lot of them.
So this limits the number of records displayed in #inspect to 10 and tells how much were effectively found.
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Disable query cache for lock queries
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Fixes #867
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See 07314e64fd62fb8e6165c8c539420160da9437e9.
Also fix some tabs in AR Changelog.
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The reason for removing the previous implementation of `#inspect` was
that it hid from you that you were dealing with a `Relation` rather than
an `Array`.
But it is still useful to be able to see the records, particularly if you're
writing something like the following in tests:
assert_equal [foo], Post.where(:bar)
If the assertion fails, you want to see what records were actually
loaded.
So this implementation makes it clear that you've got a `Relation`, but
also shows your records.
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Make ArgumentError message more consistent in nested attributes
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