| Commit message (Collapse) | Author | Age | Files | Lines |
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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Enforce frozen string in Rubocop
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`test_middleware_caches` is sometimes failed since #29454.
The failure is due to schema statements are affected by query caching.
Bypassing query caching for schema statements to avoid the issue.
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Related #22973, #24708.
`select_all`, `select_one`, `select_value`, and `select_values` method
signature is `(arel, name = nil, binds = [])`.
But `select_rows` is `(sql, name = nil, binds = [])`.
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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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Caused by 007e50d8e5a900547471b6c4ec79d9d217682c5d.
https://github.com/rails/rails/pull/26925 was closed in favor of dcb364e.
But dcb364e is only fixed sqlite3 adapter and still broken mysql2
adapter with `prepared_statements: true` (`exec_stmt_and_free`).
```diff
diff --git a/activerecord/test/config.example.yml b/activerecord/test/config.example.yml
index 58e2d45..7b3c1a6 100644
--- a/activerecord/test/config.example.yml
+++ b/activerecord/test/config.example.yml
@@ -56,9 +56,11 @@ connections:
username: rails
encoding: utf8
collation: utf8_unicode_ci
+ prepared_statements: true
arunit2:
username: rails
encoding: utf8
+ prepared_statements: true
oracle:
arunit:
```
```
% be rake test_mysql2 --verbose
...
Using mysql2
/Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb:90: warning: assigned but unused variable - result
/Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/mysql/database_statements.rb:101:in `block in exec_stmt_and_free': NameError: undefined local variable or method `result' for #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x007fe2c50eb140>: SELECT `ar_internal_metadata`.* FROM `ar_internal_metadata` WHERE `ar_internal_metadata`.`key` = ? LIMIT ? (ActiveRecord::StatementInvalid)
from /Users/kamipo/src/github.com/rails/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:586:in `block in log'
...
```
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A query may wait on a database-level lock, which could lead to a
deadlock between threads.
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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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`insert`, `update`, `delete`, and `exec_query` have a default value
against `name` and `binds`. But `exec_insert`, `exec_update`, and
`exec_delete` not have. It is an inconvenience and inconsistent.
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Because `type_cast` against `binds` always requires
`attr.value_for_database` and this pattern appears frequently.
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Address to https://github.com/rails/rails/commit/5a302bf553af0e6fedfc63299fc5cd6e79599ef3#commitcomment-18288388.
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The implementation from abstract/database_statements.rb seems to work just fine.
And with ActiveRecord::Result now implementing an optimized #first method, the
performance concerns previously addressed in
https://github.com/rails/rails/commit/bf79aa4fc14aeb2646331e767038acf0b77e9e7f
should not be an issue.
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