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Follow up of #31177.
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albertoalmagro/remove-default-mysql-engine-from-ar-5-2
Remove default ENGINE=InnoDB for Mysql2 adapter
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Before this commit ENGINE=InnoDB was added by default to Mysql2 adapter
+create_table+ if no +options+ option was provided. This default ENGINE
was lost as soon as something was passed in at +options+ option, making
its goal and propagation inconsistent, as the programmer needed to
remember including ENGINE=InnoDB when something was passed in.
This commit removes default ENGINE as its use isn't needed anymore for
current MySQL and MariaDB versions. It adds compatibility support and
tests to ensure that default ENGINE is still present for migrations
with version 5.1 and before. It also ensures we still dump the ENGINE
option to +schema.rb+ in order to avoid inconsistencies.
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Otherwise it will occur syntax error if primary key is a reserved word.
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Use CONSTRAINT_SCHEMA key for information_schema.referential_constraints.
See https://dev.mysql.com/doc/refman/5.7/en/information-schema-optimization.html.
```
> EXPLAIN SELECT fk.referenced_table_name AS 'to_table', fk.referenced_column_name AS 'primary_key', fk.column_name AS 'column', fk.constraint_name AS 'name', rc.update_rule AS 'on_update', rc.delete_rule AS 'on_delete' FROM information_schema.referential_constraints rc JOIN information_schema.key_column_usage fk USING (constraint_schema, constraint_name) WHERE fk.referenced_column_name IS NOT NULL AND fk.table_schema = 'activerecord_unittest' AND fk.table_name = 'fk_test_has_pk' AND rc.constraint_schema = 'activerecord_unittest' AND rc.table_name = 'fk_test_has_pk'\G
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: rc
partitions: NULL
type: ALL
possible_keys: NULL
key: CONSTRAINT_SCHEMA,TABLE_NAME
key_len: NULL
ref: NULL
rows: NULL
filtered: NULL
Extra: Using where; Open_full_table; Scanned 0 databases
*************************** 2. row ***************************
id: 1
select_type: SIMPLE
table: fk
partitions: NULL
type: ALL
possible_keys: NULL
key: TABLE_SCHEMA,TABLE_NAME
key_len: NULL
ref: NULL
rows: NULL
filtered: NULL
Extra: Using where; Open_full_table; Scanned 0 databases; Using join buffer (Block Nested Loop)
2 rows in set, 1 warning (0.00 sec)
```
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`options_for_index_columns`
And placed `add_options_for_index_columns` in `schema_statements.rb`
consistently to ease to find related code.
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Extract sql fragment generators from PostgreSQL adapter
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statement due to user request (#31235)
This changes `StatementTimeout` to `QueryCanceled` for PostgreSQL.
In MySQL, errno 1317 (`ER_QUERY_INTERRUPTED`) is only used when the
query is manually cancelled.
But in PostgreSQL, `QUERY_CANCELED` error code (57014) which is used
`StatementTimeout` is also used when the both case. And, we can not tell
which reason happened.
So I decided to introduce new error class `QueryCanceled` closer to the
error code name.
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Since #31129, new error class `StatementTimeout` has been added.
`TransactionTimeout` is caused by the timeout shorter than
`StatementTimeout`, but its name is too generic. I think that it should
be a name that understands the difference with `StatementTimeout`.
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Add :nodoc: to activerecord [ci skip]
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timeout exceeded (#31129)
We are sometimes using The MAX_EXECUTION_TIME hint for MySQL depending
on the situation. It will prevent catastrophic performance down by wrong
performing queries.
The new error class `StatementTimeout` will make to be easier to handle
that case.
https://dev.mysql.com/doc/refman/5.7/en/optimizer-hints.html#optimizer-hints-execution-time
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This basically reverts 9d4f79d3d394edb74fa2192e5d9ad7b09ce50c6d
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`change_column_{default,null,comment}` in mysql2 adapter are passing
`column.sql_type` as `type` to `change_column` to intend keeping
previous type. But `column_for` requires extra query, so use passing
`nil` to `type` explicitly in the internal for the purpose.
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Refactor `SchemaDumper` to make it possible to adapter specific customization
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Currently `SchemaDumper` is only customizable for column options. But
3rd party connection adapters (oracle-enhanced etc) need to customizable
for table or index dumping also. To make it possible, I introduced
adapter specific `SchemaDumper` classes for that.
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Add TransactionTimeout for MySQL error code 1205
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Because `to_sql` is public API. I introduced `to_sql_and_binds` internal
API to return SQL and binds.
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For less duplicated code.
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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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A common source of bugs and code bloat within Active Record has been the
need for us to maintain the list of bind values separately from the AST
they're associated with. This makes any sort of AST manipulation
incredibly difficult, as any time we want to potentially insert or
remove an AST node, we need to traverse the entire tree to find where
the associated bind parameters are.
With this change, the bind parameters now live on the AST directly.
Active Record does not need to know or care about them until the final
AST traversal for SQL construction. Rather than returning just the SQL,
the Arel collector will now return both the SQL and the bind parameters.
At this point the connection adapter will have all the values that it
had before.
A bit of this code is janky and something I'd like to refactor later. In
particular, I don't like how we're handling associations in the
predicate builder, the special casing of `StatementCache::Substitute` in
`QueryAttribute`, or generally how we're handling bind value replacement
in the statement cache when prepared statements are disabled.
This also mostly reverts #26378, as it moved all the code into a
location that I wanted to delete.
/cc @metaskills @yahonda, this change will affect the adapters
Fixes #29766.
Fixes #29804.
Fixes #26541.
Close #28539.
Close #24769.
Close #26468.
Close #26202.
There are probably other issues/PRs that can be closed because of this
commit, but that's all I could find on the first few pages.
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Use `TRUE` and `FALSE` boolean literals for MySQL
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Since #29699, abstract boolean serialization has been changed to use
`TRUE` and `FALSE` literals. MySQL also support the literals.
So we can use the abstract boolean serialization even for MySQL.
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Make `type_map` to private because it is only used in the connection adapter
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`type_map` is an internal API and it is only used in the connection
adapter. And also, some type map initializer methods requires passed
`type_map`, but those instances already has `type_map` in itself.
So we don't need explicit passing `type_map` to the initializers.
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Currently `version` method always returns `5.5.5` because the
`full_version` is `5.5.5-10.x.y-MariaDB...` since MariaDB 10.x.
It should be ignored if the prefix is `5.5.5-`.
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We already have database agnostic `Type::Json` since #29220.
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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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Make ActiveSupport frozen-string-literal friendly.
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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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Because identifiers in SQL could include a single quote.
Related #24950, #26784.
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Improves the performance from O(n) to O(1).
Previously it would require 50 queries to
insert 50 fixtures. Now it takes only one query.
Disabled on sqlite which doesn't support multiple inserts.
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