| Commit message (Collapse) | Author | Age | Files | Lines |
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https://www.sqlite.org/foreignkeys.html
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(I personally prefer writing one string in one line no matter how long it is, though)
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Some methods were added to public API in
5b14129d8d4ad302b4e11df6bd5c7891b75f393c and they should be not part of
the public API.
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make sql statements frozen
dup if arel is not our string
expect runtime error
dont wrap runtime error in invalid
log errors will now be treated as runtime errors
update changelog
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that accepts results of SHOW FIELDS
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Clear query cache during checkin, instead of an execution callback
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It doesn't make sense for the query cache to persist while a connection
moves through the pool and is assigned to a new thread.
[Samuel Cochran & Matthew Draper]
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This reverts commit 3a1f6fe7b4a70bf0698b0684dd48ac712c6883b6.
This commit takes the code in a direction that I am looking to avoid.
The predicate builder should be purely concerned with AST construction
as it matters to methods like `where`. Things like case sensitivity
should continue to be handled elsewhere.
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Currently uniqueness validator is coupled with building Arel ASTs.
This commit extracts `PredicateBuilder::CaseSensitiveHandler` for
decouple the building Arel ASTs.
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Revert passing arel node with splat binds for `where`
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A `value` is only used for checking `value.nil?`. It is unnecessary if
immediately return when `value.nil?`.
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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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To avoid relying on the connection adapter for type casting binds.
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Address to https://github.com/rails/rails/commit/5a302bf553af0e6fedfc63299fc5cd6e79599ef3#commitcomment-18288388.
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A thread can only release a connection if it owns it, or it's owned by a
thread that has died.
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In 5.0 we use bind parameters for limit and offset, while in 4.2 we used
the values directly. The code as it was written assumed that limit and
offset worked as `LIMIT ? OFFSET ?`. Both Oracle and SQL Server have a
different syntax, where the offset is stated before the limit. We
delegate this behavior to the connection adapter so that these adapters
are able to determine how the bind parameters are flattened based on
what order their specification has the various clauses appear.
Fixes #24775
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Move remaining current_savepoint_name to savepoints module
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in the case of sqlite.
Others adapters need to perform a check for validity.
Add coverage for mysql2 db type validation
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Example:
create_table :users do |t|
t.string :name
t.index 'lower(name) varchar_pattern_ops'
end
Fixes #19090.
Fixes #21765.
Fixes #21819.
Fixes #24359.
Signed-off-by: Jeremy Daer <jeremydaer@gmail.com>
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Adapters override `#supports_savepoints?` to return `true` if they
support transaction savepoints. Defaults to `false`.
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Follow up to #24685. `insert_versions_sql` is not public API.
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78 changed INSERT INTO versions to run in 1 single query.
This breaks for sqlite versions < 3.7.11, which is especially the case on Ubuntu 12.04 LTS, that has SQLite version 3.7.9 as default.
So we check for support for multi insert, before performing single query inserts, else fallback to older version of running multiple queries.
[Vipul A M & Yasuo Honda]
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`Arel::Visitors::VISITORS` was removed at https://github.com/rails/arel/pull/412.
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Extract `arel_visitor` and move up to the abstract adapter
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* Switch to keyword args where we can without breaking compat.
* Use add_table_options! for :options, too.
* Some code polish.
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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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These should allow external code to run blocks of user code to do
"work", at a similar unit size to a web request, without needing to get
intimate with ActionDipatch.
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Remove unused require
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`require 'active_support/core_ext/benchmark'` was added by 4ecdf24.
But currently unused anymore.
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Simply it is sufficient to override `can_perform_case_insensitive_comparison_for?`.
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Arel handles substitution for bind parameters by now.
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used by #add_reference in schema_statements
- Fixes #22916.
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Before:
```
SELECT 1 AS one FROM "topics" WHERE "topics"."title" = 'abc' LIMIT $1 [["LIMIT", 1]]
```
After:
```
SELECT 1 AS one FROM "topics" WHERE "topics"."title" = $1 LIMIT $2 [["title", "abc"], ["LIMIT", 1]]
```
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Follow up to #22642.
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`pool` in args is unused anymore. And `config` is used in all adapters.
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- key was a poor choice of name. A key implies something that will
unlock a lock. The concept is actually more like a 'lock identifier'
- mysql documentation calls this a 'lock name'
- postgres documentation calls it a 'lock_id'
- Updated variable names to reflect the preferred terminology for the database in
question
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- Addresses issue #22092
- Works on Postgres and MySQL
- Uses advisory locks because of two important properties:
1. The can be obtained outside of the context of a transaction
2. They are automatically released when the session ends, so if a
migration process crashed for whatever reason the lock is not left
open perpetually
- Adds get_advisory_lock and release_advisory_lock methods to database
adapters
- Attempting to run a migration while another one is in process will
raise a ConcurrentMigrationError instead of attempting to run in
parallel with undefined behavior. This could be rescued and
the migration could exit cleanly instead. Perhaps as a configuration
option?
Technical Notes
==============
The Migrator uses generate_migrator_advisory_lock_key to build the key
for the lock. In order to be compatible across multiple adapters there
are some constraints on this key.
- Postgres limits us to 64 bit signed integers
- MySQL advisory locks are server-wide so we have to scope to the
database
- To fulfil these requirements we use a Migrator salt (a randomly
chosen signed integer with max length of 31 bits) that identifies
the Rails migration process as the owner of the lock. We multiply
this salt with a CRC32 unsigned integer hash of the database name to
get a signed 64 bit integer that can also be converted to a string
to act as a lock key in MySQL databases.
- It is important for subsequent versions of the Migrator to use the
same salt, otherwise different versions of the Migrator will not see
each other's locks.
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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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The focus of this change is to make the API more accessible.
References to method and classes should be linked to make it easy to
navigate around.
This patch makes exzessiv use of `rdoc-ref:` to provide more readable
docs. This makes it possible to document `ActiveRecord::Base#save` even
though the method is within a separate module
`ActiveRecord::Persistence`. The goal here is to bring the API closer to
the actual code that you would write.
This commit only deals with Active Record. The other gems will be
updated accordingly but in different commits. The pass through Active
Record is not completely finished yet. A follow up commit will change
the spots I haven't yet had the time to update.
/cc @fxn
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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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