| Commit message (Collapse) | Author | Age | Files | Lines |
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I've experienced this issue in our app, some hints only works on Top
level query (e.g. `MAX_EXECUTION_TIME`).
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Also, `reset_column_information` is unnecessary since `reset_table_name`
does that too.
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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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Add dirty methods for store accessors
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This patch has two main portions:
1. Add SQL comment support to Arel via Arel::Nodes::Comment.
2. Implement a Relation#annotate method on top of that.
== Adding SQL comment support
Adds a new Arel::Nodes::Comment node that represents an optional SQL
comment and teachers the relevant visitors how to handle it.
Comment nodes may be added to the basic CRUD statement nodes and set
through any of the four (Select|Insert|Update|Delete)Manager objects.
For example:
manager = Arel::UpdateManager.new
manager.table table
manager.comment("annotation")
manager.to_sql # UPDATE "users" /* annotation */
This new node type will be used by ActiveRecord::Relation to enable
query annotation via SQL comments.
== Implementing the Relation#annotate method
Implements `ActiveRecord::Relation#annotate`, which accepts a comment
string that will be appeneded to any queries generated by the relation.
Some examples:
relation = Post.where(id: 123).annotate("metadata string")
relation.first
# SELECT "posts".* FROM "posts" WHERE "posts"."id" = 123
# LIMIT 1 /* metadata string */
class Tag < ActiveRecord::Base
scope :foo_annotated, -> { annotate("foo") }
end
Tag.foo_annotated.annotate("bar").first
# SELECT "tags".* FROM "tags" LIMIT 1 /* foo */ /* bar */
Also wires up the plumbing so this works with `#update_all` and
`#delete_all` as well.
This feature is useful for instrumentation and general analysis of
queries generated at runtime.
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This is to easier make `truncate_tables` to bulk statements.
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We as Arm Treasure Data are using Optimizer Hints with a monkey patch
(https://gist.github.com/kamipo/4c8539f0ce4acf85075cf5a6b0d9712e),
especially in order to use `MAX_EXECUTION_TIME` (refer #31129).
Example:
```ruby
class Job < ApplicationRecord
default_scope { optimizer_hints("MAX_EXECUTION_TIME(50000) NO_INDEX_MERGE(jobs)") }
end
```
Optimizer Hints is supported not only for MySQL but also for most
databases (PostgreSQL on RDS, Oracle, SQL Server, etc), it is really
helpful to turn heavy queries for large scale applications.
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* The READ_QUERY regex would consider reads to be writes if they started with
spaces or parens. For example, a UNION query might have parens around each
SELECT - (SELECT ...) UNION (SELECT ...).
* It will now correctly treat these queries as reads.
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Use "support/stubs/strong_parameters" instead.
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Reduce unused allocations when casting UUIDs for Postgres
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Using the subscript method `#[]` on a string has several overloads and
rather complex implementation. One of the overloads is the capability to
accept a regular expression and then run a match, then return the
receiver (if it matched) or one of the groups from the MatchData.
The function of the `UUID#cast` method is to cast a UUID to a type and
format acceptable by postgres. Naturally UUIDs are supposed to be
string and of a certain format, but it had been determined that it was
not ideal for the framework to send just any old string to Postgres and
allow the engine to complain when "foobar" or "" was sent, being
obviously of the wrong format for a valid UUID. Therefore this code was
written to facilitate the checking, and if it were not of the correct
format, a `nil` would be returned as is conventional in Rails.
Now, the subscript method will allocate one or more strings on a match
and return one of them, based on the index parameter. However, there
is no need for a new string, as a UUID of the correct format is already
such, and so long as the format was verified then the string supplied is
adequate for consumption by the database.
The subscript method also creates a MatchData object which will never be
used, and so must eventually be garbage collected.
Garbage collection indeed. This innocuous method tends to be called
quite a lot, for example if the primary key of a table is a uuid, then
this method will be called. If the foreign key of a relation is a UUID,
once again this method is called. If that foreign key is belonging to
a has_many relationship with dozens of objects, then again dozens of
UUIDs shall be cast to a dup of themselves, and spawn dozens of
MatchData objects, and so on.
So, for users that:
* Use UUIDs as primary keys
* Use Postgres
* Operate on collections of objects
This accomplishes a significant savings in total allocations, and may
save many garbage collections.
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That is considered as silently leaking information.
If type casting doesn't return any actual value, it should not be
matched to any record.
Fixes #33624.
Closes #33946.
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Since #31230, `change_column` is executed as a bulk statement.
That caused incorrect type casting column default by looking up the
before changed type, not the after changed type.
In a bulk statement, we can't use `change_column_default_for_alter` if
the statement changes the column type.
This fixes the type casting to use the constructed target sql_type.
Fixes #34938.
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Currently we sometimes find a redundant begin block in code review
(e.g. https://github.com/rails/rails/pull/33604#discussion_r209784205).
I'd like to enable `Style/RedundantBegin` cop to avoid that, since
rescue/else/ensure are allowed inside do/end blocks in Ruby 2.5
(https://bugs.ruby-lang.org/issues/12906), so we'd probably meets with
that situation than before.
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since Ruby 2.5
https://bugs.ruby-lang.org/issues/14133
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I originally named this `StatementInvalid` because that's what we do in
GitHub, but `@tenderlove` pointed out that this means apps can't test
for or explitly rescue this error. `StatementInvalid` is pretty broad so
I've renamed this to `ReadOnlyError`.
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This PR adds the ability to prevent writes to a database even if the
database user is able to write (ie the database is a primary and not a
replica).
This is useful for a few reasons: 1) when converting your database from
a single db to a primary/replica setup - you can fix all the writes on
reads early on, 2) when we implement automatic database switching or
when an app is manually switching connections this feature can be used
to ensure reads are reading and writes are writing. We want to make sure
we raise if we ever try to write in read mode, regardless of database
type and 3) for local development if you don't want to set up multiple
databases but do want to support rw/ro queries.
This should be used in conjunction with `connected_to` in write mode.
For example:
```
ActiveRecord::Base.connected_to(role: :writing) do
Dog.connection.while_preventing_writes do
Dog.create! # will raise because we're preventing writes
end
end
ActiveRecord::Base.connected_to(role: :reading) do
Dog.connection.while_preventing_writes do
Dog.first # will not raise because we're not writing
end
end
```
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Fixes issue where "user post" is misinterpreted as "\"user\".\"post\""
when quoting table names with the postgres adapter.
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https://www.postgresql.org/support/versioning/
- 9.1 EOLed on September 2016.
- 9.2 EOLed on September 2017.
9.3 is also not supported since Nov 8, 2018. https://www.postgresql.org/about/news/1905/
I think it may be a little bit early to drop PostgreSQL 9.3 yet.
* Deprecated `supports_ranges?` since no other databases support range data type
* Add `supports_materialized_views?` to abstract adapter
Materialized views itself is supported by other databases, other connection adapters may support them
* Remove `with_manual_interventions`
It was only necessary for PostgreSQL 9.1 or earlier
* Drop CI against PostgreSQL 9.2
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Before:
```
LOG: execute <unnamed>: SELECT t.oid, t.typname
FROM pg_type as t
WHERE t.typname IN ('int2', 'int4', 'int8', 'oid', 'float4', 'float8', 'bool')
LOG: execute <unnamed>: SELECT t.oid, t.typname, t.typelem, t.typdelim, t.typinput, r.rngsubtype, t.typtype, t.typbasetype
FROM pg_type as t
LEFT JOIN pg_range as r ON oid = rngtypid
WHERE
t.typname IN ('int2', 'int4', 'int8', 'oid', 'float4', 'float8', 'text', 'varchar', 'char', 'name', 'bpchar', 'bool', 'bit', 'varbit', 'timestamptz', 'date', 'money', 'bytea', 'point', 'hstore', 'json', 'jsonb', 'cidr', 'inet', 'uuid', 'xml', 'tsvector', 'macaddr', 'citext', 'ltree', 'interval', 'path', 'line', 'polygon', 'circle', 'lseg', 'box', 'time', 'timestamp', 'numeric')
OR t.typtype IN ('r', 'e', 'd')
OR t.typinput::varchar = 'array_in'
OR t.typelem != 0
LOG: statement: SHOW TIME ZONE
LOG: statement: SELECT 1
LOG: execute <unnamed>: SELECT COUNT(*)
FROM pg_class c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r','v','m') -- (r)elation/table, (v)iew, (m)aterialized view
AND c.relname = 'accounts'
AND n.nspname = ANY (current_schemas(false))
```
After:
```
LOG: execute <unnamed>: SELECT t.oid, t.typname
FROM pg_type as t
WHERE t.typname IN ('int2', 'int4', 'int8', 'oid', 'float4', 'float8', 'bool')
LOG: execute <unnamed>: SELECT t.oid, t.typname, t.typelem, t.typdelim, t.typinput, r.rngsubtype, t.typtype, t.typbasetype
FROM pg_type as t
LEFT JOIN pg_range as r ON oid = rngtypid
WHERE
t.typname IN ('int2', 'int4', 'int8', 'oid', 'float4', 'float8', 'text', 'varchar', 'char', 'name', 'bpchar', 'bool', 'bit', 'varbit', 'timestamptz', 'date', 'money', 'bytea', 'point', 'hstore', 'json', 'jsonb', 'cidr', 'inet', 'uuid', 'xml', 'tsvector', 'macaddr', 'citext', 'ltree', 'interval', 'path', 'line', 'polygon', 'circle', 'lseg', 'box', 'time', 'timestamp', 'numeric')
OR t.typtype IN ('r', 'e', 'd')
OR t.typinput::varchar = 'array_in'
OR t.typelem != 0
LOG: statement: SHOW TIME ZONE
LOG: statement: SELECT 1
LOG: execute <unnamed>: SELECT COUNT(*)
FROM pg_class c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r','v','m') -- (r)elation/table, (v)iew, (m)aterialized view
AND c.relname = 'accounts'
AND n.nspname = ANY (current_schemas(false))
```
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in indexdef to be wrapped up by double quotes
Fixes #34493.
*Thomas Bianchini*
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This commit adds support for the
`ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.create_unlogged_tables`
setting, which turns `CREATE TABLE` SQL statements into
`CREATE UNLOGGED TABLE` statements.
This can improve PostgreSQL performance but at the
cost of data durability, and thus it is highly recommended
that you *DO NOT* enable this in a production environment.
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Follow up a741208f80dd33420a56486bd9ed2b0b9862234a.
Since a741208, `Decimal#serialize` which is superclass of `Money` type
is no longer no-op, so it consistently serialize/deserialize a value as
a decimal even if schema default.
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In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.
```ruby
# frozen_string_literal: true
require "bundler/inline"
gemfile(true) do
source "https://rubygems.org"
gem "benchmark-ips"
end
Benchmark.ips do |x|
x.report('+@') { +"" }
x.report('dup') { "".dup }
x.compare!
end
```
```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
+@ 282.289k i/100ms
dup 187.638k i/100ms
Calculating -------------------------------------
+@ 6.775M (± 3.6%) i/s - 33.875M in 5.006253s
dup 3.320M (± 2.2%) i/s - 16.700M in 5.032125s
Comparison:
+@: 6775299.3 i/s
dup: 3320400.7 i/s - 2.04x slower
```
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Rather than a configuration on the connection.
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Omit BEGIN/COMMIT statements for empty transactions
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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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https://github.com/rails/rails/issues/31190
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* PostgreSQL 10 new relkind for partitioned tables
Starting with PostgreSQL 10, we can now have partitioned tables natively
* Add comment
* Remove extra space
* Add test for partition table in postgreSQL10
* Select 'p' for "BASE TABLE" and add a test case
to support PostgreSQL 10 partition tables
* Address RuboCop offense
* Addressed incorrect `postgresql_version`
Fixes #33008.
[Yannick Schutz & Yasuo Honda & Ryuta Kamizono]
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[Jon Moss & Xavier Noria]
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Since `parse_raw_value_as_a_number` may not always parse raw value from
database as a number without type casting (e.g. "$150.55" as money
format).
Fixes #32531.
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Since #26074, introduced force equality checking to build a predicate
consistently for both `find` and `create` (fixes #27313).
But the assumption that only array/range attribute have subtype was
wrong. We need to make force equality checking more strictly not to
allow serialized attribute.
Fixes #32761.
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Follow up of #32605.
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Since Rails 6 requires Ruby 2.4.1+.
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Prevent `ActiveRecord::FinderMethods#limited_ids_for` from using correct primary
key values even if `ORDER BY` columns include other table's primary key.
Fixes #28364.
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BC dates are supported by both date and datetime types.
https://www.postgresql.org/docs/current/static/datatype-datetime.html
Since #1097, new datetime allows year zero as 1 BC, but new date does
not. It should be allowed even in new date consistently.
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The values infinity and -infinity are supported by both date and
timestamp types.
https://www.postgresql.org/docs/current/static/datatype-datetime.html#DATATYPE-DATETIME-SPECIAL-TABLE
And also, it can not be known whether a value is infinity correctly
unless cast a value.
I've added `QueryAttribute#infinity?` to handle that case.
Closes #27585.
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Closes #31998
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Build a multi-statement query when inserting fixtures
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