| Commit message (Collapse) | Author | Age | Files | Lines |
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* The database version will get cached in the schema cache file during the
schema cache dump. When the database version check happens, the version will
be pulled from the schema cache and thus avoid querying the database for
the version.
* If the schema cache file doesn't exist, we'll query the database for the
version and cache it on the schema cache object.
* To facilitate this change, all connection adapters now implement
#get_database_version and #database_version. #database_version returns the
value from the schema cache.
* To take advantage of the cached database version, the database version check
will now happen after the schema cache is set on the connection in the
connection pool.
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Since Rails 6.0 will support Ruby 2.4.1 or higher
`# frozen_string_literal: true` magic comment is enough to make string object frozen.
This magic comment is enabled by `Style/FrozenStringLiteralComment` cop.
* Exclude these files not to auto correct false positive `Regexp#freeze`
- 'actionpack/lib/action_dispatch/journey/router/utils.rb'
- 'activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb'
It has been fixed by https://github.com/rubocop-hq/rubocop/pull/6333
Once the newer version of RuboCop released and available at Code Climate these exclude entries should be removed.
* Replace `String#freeze` with `String#-@` manually if explicit frozen string objects are required
- 'actionpack/test/controller/test_case_test.rb'
- 'activemodel/test/cases/type/string_test.rb'
- 'activesupport/lib/active_support/core_ext/string/strip.rb'
- 'activesupport/test/core_ext/string_ext_test.rb'
- 'railties/test/generators/actions_test.rb'
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Suggested at https://github.com/rails/rails/pull/33876#issuecomment-421176221
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If a transaction is opened and closed without any queries being run, we
can safely omit the `BEGIN` and `COMMIT` statements, as they only exist
to modify the connection's behaviour inside the transaction. This
removes the overhead of those statements when saving a record with no
changes, which makes workarounds like `save if changed?` unnecessary.
This implementation buffers transactions inside the transaction manager
and materializes them the next time the connection is used. For this to
work, the adapter needs to guard all connection use with a call to
`materialize_transactions`. Because of this, adapters must opt in to get
this new behaviour by implementing `supports_lazy_transactions?`.
If `raw_connection` is used to get a reference to the underlying
database connection, the behaviour is disabled and transactions are
opened eagerly, as we can't know how the connection will be used.
However when the connection is checked back into the pool, we can assume
that the application won't use the reference again and reenable lazy
transactions. This prevents a single `raw_connection` call from
disabling lazy transactions for the lifetime of the connection.
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Use attr_reader/attr_writer instead of methods
method is 12% slower
Use flat_map over map.flatten(1)
flatten is 66% slower
Use hash[]= instead of hash.merge! with single arguments
merge! is 166% slower
See https://github.com/rails/rails/pull/32337 for more conversation
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Since #31173, mysql2 adapter depends on `automatic_close` which is
introduced since mysql2 0.4.3. So the adapter with the mysql2 version
before doesn't work with fork now.
```
% ARCONN=mysql2 be ruby -w -Itest test/cases/connection_adapters/connection_handler_test.rb -n test_forked_child_doesnt_mangle_parent_connection
Using mysql2
Run options: -n test_forked_child_doesnt_mangle_parent_connection --seed 19988
/Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb:108:in `discard!': undefined method `automatic_close=' for #<Mysql2::Client:0x00007fedaa91dfd0> (NoMethodError)
```
This drops mysql2 version less than 0.4.3 to guarantee fork safety.
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Use whatever adapter-provided means we have available to ensure forked
children don't send quit/shutdown/goodbye messages to the server on
connections that belonged to their parent.
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This basically reverts 9d4f79d3d394edb74fa2192e5d9ad7b09ce50c6d
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This also reverts the change to enable prepared statements by default on
MySQL (though I suspect we could enable them and it'd be great). This
change brings back a collector closer to the old `Bind` collector in
Arel. However, this one lives in AR, since this is an AR specific need.
Additionally, we only use it for statement caching, since the new
substitute collector in Arel is higher performance for most cases.
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There's an actual bug in 213796fb4936dce1da2f0c097a054e1af5c25c2c around
prepared statements being disabled. I'm looking into it, but in the mean
time this gets the build green so it doesn't block other PRs
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versions of mysql2
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By doing `@connection = nil` that means that we need nil checks before it
is used anywhere, but we weren't doing those checks. Instead, we get a
NoMethodError after using a connection after it fails to reconnect.
Neither of the other adapters set @connection to nil, just the mysql2
adapter. By just closing it, we avoid the need to check if we have a
connection object and it will produce an appropriate exception when used.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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Adapters override `#supports_savepoints?` to return `true` if they
support transaction savepoints. Defaults to `false`.
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Add prepared statements support for `Mysql2Adapter`
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Comments are specified in migrations, stored in database itself (in its schema),
and dumped into db/schema.rb file.
This allows to generate good documentation and explain columns and tables' purpose
to everyone from new developers to database administrators.
For PostgreSQL and MySQL only. SQLite does not support comments at the moment.
See docs for PostgreSQL: http://www.postgresql.org/docs/current/static/sql-comment.html
See docs for MySQL: http://dev.mysql.com/doc/refman/5.7/en/create-table.html
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Simply it is sufficient to use the method in the super class.
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Currently `exec_query` raises `NoMethodError` when executing no result
queries (`INSERT`, `UPDATE`, `DELETE`, and all DDL) in mysql2 adapter.
```
irb(main):002:0> conn.execute("create table t(a int)")
(43.3ms) create table t(a int)
=> nil
irb(main):003:0> conn.execute("insert into t values (1)")
(19.3ms) insert into t values (1)
=> nil
irb(main):004:0> conn.exec_query("insert into t values (1)")
SQL (28.6ms) insert into t values (1)
NoMethodError: undefined method `fields' for nil:NilClass
```
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This alias was for compatibility with legacy mysql adapter.
But the return value of both methods is already inconsistent.
`exec_query` returns `ActiveRecord::Result` instance.
But `exec_without_stmt` returns `[result_set, affected_rows]`
https://github.com/rails/rails/blob/v4.2.5.1/activerecord/lib/active_record/connection_adapters/mysql_adapter.rb#L335-L364
Legacy mysql adapter was already removed in Rails 5.0.
I think we can remove this inconsistent alias.
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Fixes #22980.
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`connection.insert_sql` is almost the same as `connection.insert`.
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Originally `connection#create` had aliased to `connection#insert` in PG
adapter. But it was broken by #7447. Re-alias `create` to `insert` for
fixing it.
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These `select_*` methods improved already.
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Avoid instanciate `ActiveRecord::Result` and calling
`ActiveRecord::Result#hash_rows` for the performance.
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Fix white-space
Add test case demonstrating flags are received by the adapter
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Not needed for `Mysql2Adapter` and `AbstractMysqlAdapter`.
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Not needed for `Mysql2Adapter` and `AbstractMysqlAdapter`.
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Prior to this commit, Rails makes no differentiation between whether a
query uses bind parameters, and whether or not we cache that query as a
prepared statement. This leads to the cache populating extremely fast in
some cases, with the statements never being reused.
In particular, the two problematic cases are `where(foo: [1, 2, 3])` and
`where("foo = ?", 1)`. In both cases we'll end up quoting the values
rather than using a bind param, causing a cache entry for every value
ever used in that query.
It was noted that we can probably eventually change `where("foo = ?",
1)` to use a bind param, which would resolve that case. Additionally, on
PG we can change our generated query to be `WHERE foo = ANY($1)`, and
pass an array for the bind param. I hope to accomplish both in the
future.
For SQLite and MySQL, we still end up preparing the statements anyway,
we just don't cache it. The statement will be cleaned up after it is
executed. On postgres, we skip the prepare step entirely, as an API is
provided to execute with bind params without preparing the statement.
I'm not 100% happy on the way this ended up being structured. I was
hoping to use a decorator on the visitor, rather than mixing a module
into the object, but the way Arel has it's visitor pattern set up makes
it very difficult to extend without inheritance. I'd like to remove the
duplication from the various places that are extending it, but that'll
require a larger restructuring of that initialization logic. I'm going
to take another look at the structure of it soon.
This changes the signature of one of the adapter's internals, and will
require downstream changes from third party adapters. I'm not too
worried about this, as worst case they can simply add the parameter and
always ignore it, and just keep their previous behavior.
Fixes #21992.
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Move `explain` into `AbstractMysqlAdapter`
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Common methods in both mysql adapters are should be added to
`AbstractMysqlAdapter`, but some methods had been added to
`Mysql2Adapter`. (8744632f, 0306f82e, #14359)
Some methods already moved from `Mysql2Adapter` to
`AbstractMysqlAdapter`. (#17601, #17998)
Common methods in both mysql adapters are remaining only the `explain`
method in `Mysql2Adapter`.
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Known failure on Ruby 2.3/trunk: brianmario/mysql2#671
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As of MySQL 5.7.8, MySQL supports a native JSON data type.
Example:
create_table :json_data_type do |t|
t.json :settings
end
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Because `info[:version]` is a client version, the server version is
`server_info[:version]`.
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Follow up #18914.
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MySQL unicode support is not only `utf8mb4`.
Then, The index length problem is not only `utf8mb4`.
http://dev.mysql.com/doc/refman/5.6/en/charset-unicode.html
SELECT * FROM information_schema.character_sets WHERE maxlen > 3;
+--------------------+----------------------+------------------+--------+
| CHARACTER_SET_NAME | DEFAULT_COLLATE_NAME | DESCRIPTION | MAXLEN |
+--------------------+----------------------+------------------+--------+
| utf8mb4 | utf8mb4_general_ci | UTF-8 Unicode | 4 |
| utf16 | utf16_general_ci | UTF-16 Unicode | 4 |
| utf16le | utf16le_general_ci | UTF-16LE Unicode | 4 |
| utf32 | utf32_general_ci | UTF-32 Unicode | 4 |
+--------------------+----------------------+------------------+--------+
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The charset of `version` column in `schema_migrations` table is depend
on the database default charset and collation rather than the encoding
of the connection.
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