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# frozen_string_literal: true
require "active_record/connection_adapters/abstract_adapter"
require "active_record/connection_adapters/statement_pool"
require "active_record/connection_adapters/mysql/column"
require "active_record/connection_adapters/mysql/explain_pretty_printer"
require "active_record/connection_adapters/mysql/quoting"
require "active_record/connection_adapters/mysql/schema_creation"
require "active_record/connection_adapters/mysql/schema_definitions"
require "active_record/connection_adapters/mysql/schema_dumper"
require "active_record/connection_adapters/mysql/schema_statements"
require "active_record/connection_adapters/mysql/type_metadata"
module ActiveRecord
module ConnectionAdapters
class AbstractMysqlAdapter < AbstractAdapter
include MySQL::Quoting
include MySQL::SchemaStatements
##
# :singleton-method:
# By default, the Mysql2Adapter will consider all columns of type <tt>tinyint(1)</tt>
# as boolean. If you wish to disable this emulation you can add the following line
# to your application.rb file:
#
# ActiveRecord::ConnectionAdapters::Mysql2Adapter.emulate_booleans = false
class_attribute :emulate_booleans, default: true
NATIVE_DATABASE_TYPES = {
primary_key: "bigint auto_increment PRIMARY KEY",
string: { name: "varchar", limit: 255 },
text: { name: "text" },
integer: { name: "int", limit: 4 },
float: { name: "float", limit: 24 },
decimal: { name: "decimal" },
datetime: { name: "datetime" },
timestamp: { name: "timestamp" },
time: { name: "time" },
date: { name: "date" },
binary: { name: "blob" },
blob: { name: "blob" },
boolean: { name: "tinyint", limit: 1 },
json: { name: "json" },
}
class StatementPool < ConnectionAdapters::StatementPool # :nodoc:
private
def dealloc(stmt)
stmt.close
end
end
def initialize(connection, logger, connection_options, config)
super(connection, logger, config)
end
def version #:nodoc:
@version ||= Version.new(version_string)
end
def mariadb? # :nodoc:
/mariadb/i.match?(full_version)
end
def supports_bulk_alter? #:nodoc:
true
end
def supports_index_sort_order?
!mariadb? && version >= "8.0.1"
end
def supports_expression_index?
!mariadb? && version >= "8.0.13"
end
def supports_transaction_isolation?
true
end
def supports_explain?
true
end
def supports_indexes_in_create?
true
end
def supports_foreign_keys?
true
end
def supports_views?
true
end
def supports_datetime_with_precision?
mariadb? || version >= "5.6.4"
end
def supports_virtual_columns?
mariadb? || version >= "5.7.5"
end
# See https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html for more details.
def supports_optimizer_hints?
!mariadb? && version >= "5.7.7"
end
def supports_advisory_locks?
true
end
def supports_insert_on_duplicate_skip?
true
end
def supports_insert_on_duplicate_update?
true
end
def get_advisory_lock(lock_name, timeout = 0) # :nodoc:
query_value("SELECT GET_LOCK(#{quote(lock_name.to_s)}, #{timeout})") == 1
end
def release_advisory_lock(lock_name) # :nodoc:
query_value("SELECT RELEASE_LOCK(#{quote(lock_name.to_s)})") == 1
end
def native_database_types
NATIVE_DATABASE_TYPES
end
def index_algorithms
{ default: +"ALGORITHM = DEFAULT", copy: +"ALGORITHM = COPY", inplace: +"ALGORITHM = INPLACE" }
end
# HELPER METHODS ===========================================
# The two drivers have slightly different ways of yielding hashes of results, so
# this method must be implemented to provide a uniform interface.
def each_hash(result) # :nodoc:
raise NotImplementedError
end
# Must return the MySQL error number from the exception, if the exception has an
# error number.
def error_number(exception) # :nodoc:
raise NotImplementedError
end
# REFERENTIAL INTEGRITY ====================================
def disable_referential_integrity #:nodoc:
old = query_value("SELECT @@FOREIGN_KEY_CHECKS")
begin
update("SET FOREIGN_KEY_CHECKS = 0")
yield
ensure
update("SET FOREIGN_KEY_CHECKS = #{old}")
end
end
# CONNECTION MANAGEMENT ====================================
def clear_cache! # :nodoc:
reload_type_map
super
end
#--
# DATABASE STATEMENTS ======================================
#++
def explain(arel, binds = [])
sql = "EXPLAIN #{to_sql(arel, binds)}"
start = Concurrent.monotonic_time
result = exec_query(sql, "EXPLAIN", binds)
elapsed = Concurrent.monotonic_time - start
MySQL::ExplainPrettyPrinter.new.pp(result, elapsed)
end
# Executes the SQL statement in the context of this connection.
def execute(sql, name = nil)
materialize_transactions
log(sql, name) do
ActiveSupport::Dependencies.interlock.permit_concurrent_loads do
@connection.query(sql)
end
end
end
# Mysql2Adapter doesn't have to free a result after using it, but we use this method
# to write stuff in an abstract way without concerning ourselves about whether it
# needs to be explicitly freed or not.
def execute_and_free(sql, name = nil) # :nodoc:
yield execute(sql, name)
end
def begin_db_transaction
execute "BEGIN"
end
def begin_isolated_db_transaction(isolation)
execute "SET TRANSACTION ISOLATION LEVEL #{transaction_isolation_levels.fetch(isolation)}"
begin_db_transaction
end
def commit_db_transaction #:nodoc:
execute "COMMIT"
end
def exec_rollback_db_transaction #:nodoc:
execute "ROLLBACK"
end
def empty_insert_statement_value(primary_key = nil)
"VALUES ()"
end
# SCHEMA STATEMENTS ========================================
# Drops the database specified on the +name+ attribute
# and creates it again using the provided +options+.
def recreate_database(name, options = {})
drop_database(name)
sql = create_database(name, options)
reconnect!
sql
end
# Create a new MySQL database with optional <tt>:charset</tt> and <tt>:collation</tt>.
# Charset defaults to utf8mb4.
#
# Example:
# create_database 'charset_test', charset: 'latin1', collation: 'latin1_bin'
# create_database 'matt_development'
# create_database 'matt_development', charset: :big5
def create_database(name, options = {})
if options[:collation]
execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT COLLATE #{quote_table_name(options[:collation])}"
elsif options[:charset]
execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT CHARACTER SET #{quote_table_name(options[:charset])}"
elsif row_format_dynamic_by_default?
execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT CHARACTER SET `utf8mb4`"
else
raise "Configure a supported :charset and ensure innodb_large_prefix is enabled to support indexes on varchar(255) string columns."
end
end
# Drops a MySQL database.
#
# Example:
# drop_database('sebastian_development')
def drop_database(name) #:nodoc:
execute "DROP DATABASE IF EXISTS #{quote_table_name(name)}"
end
def current_database
query_value("SELECT database()", "SCHEMA")
end
# Returns the database character set.
def charset
show_variable "character_set_database"
end
# Returns the database collation strategy.
def collation
show_variable "collation_database"
end
def table_comment(table_name) # :nodoc:
scope = quoted_scope(table_name)
query_value(<<~SQL, "SCHEMA").presence
SELECT table_comment
FROM information_schema.tables
WHERE table_schema = #{scope[:schema]}
AND table_name = #{scope[:name]}
SQL
end
def bulk_change_table(table_name, operations) #:nodoc:
sqls = operations.flat_map do |command, args|
table, arguments = args.shift, args
method = :"#{command}_for_alter"
if respond_to?(method, true)
send(method, table, *arguments)
else
raise "Unknown method called : #{method}(#{arguments.inspect})"
end
end.join(", ")
execute("ALTER TABLE #{quote_table_name(table_name)} #{sqls}")
end
def change_table_comment(table_name, comment) #:nodoc:
comment = "" if comment.nil?
execute("ALTER TABLE #{quote_table_name(table_name)} COMMENT #{quote(comment)}")
end
# Renames a table.
#
# Example:
# rename_table('octopuses', 'octopi')
def rename_table(table_name, new_name)
execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
rename_table_indexes(table_name, new_name)
end
# Drops a table from the database.
#
# [<tt>:force</tt>]
# Set to +:cascade+ to drop dependent objects as well.
# Defaults to false.
# [<tt>:if_exists</tt>]
# Set to +true+ to only drop the table if it exists.
# Defaults to false.
# [<tt>:temporary</tt>]
# Set to +true+ to drop temporary table.
# Defaults to false.
#
# Although this command ignores most +options+ and the block if one is given,
# it can be helpful to provide these in a migration's +change+ method so it can be reverted.
# In that case, +options+ and the block will be used by create_table.
def drop_table(table_name, options = {})
execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
end
def rename_index(table_name, old_name, new_name)
if supports_rename_index?
validate_index_length!(table_name, new_name)
execute "ALTER TABLE #{quote_table_name(table_name)} RENAME INDEX #{quote_table_name(old_name)} TO #{quote_table_name(new_name)}"
else
super
end
end
def change_column_default(table_name, column_name, default_or_changes) #:nodoc:
default = extract_new_default_value(default_or_changes)
change_column table_name, column_name, nil, default: default
end
def change_column_null(table_name, column_name, null, default = nil) #:nodoc:
unless null || default.nil?
execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
end
change_column table_name, column_name, nil, null: null
end
def change_column_comment(table_name, column_name, comment) #:nodoc:
change_column table_name, column_name, nil, comment: comment
end
def change_column(table_name, column_name, type, options = {}) #:nodoc:
execute("ALTER TABLE #{quote_table_name(table_name)} #{change_column_for_alter(table_name, column_name, type, options)}")
end
def rename_column(table_name, column_name, new_column_name) #:nodoc:
execute("ALTER TABLE #{quote_table_name(table_name)} #{rename_column_for_alter(table_name, column_name, new_column_name)}")
rename_column_indexes(table_name, column_name, new_column_name)
end
def add_index(table_name, column_name, options = {}) #:nodoc:
index_name, index_type, index_columns, _, index_algorithm, index_using, comment = add_index_options(table_name, column_name, options)
sql = +"CREATE #{index_type} INDEX #{quote_column_name(index_name)} #{index_using} ON #{quote_table_name(table_name)} (#{index_columns}) #{index_algorithm}"
execute add_sql_comment!(sql, comment)
end
def add_sql_comment!(sql, comment) # :nodoc:
sql << " COMMENT #{quote(comment)}" if comment.present?
sql
end
def foreign_keys(table_name)
raise ArgumentError unless table_name.present?
scope = quoted_scope(table_name)
fk_info = exec_query(<<~SQL, "SCHEMA")
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 = #{scope[:schema]}
AND fk.table_name = #{scope[:name]}
AND rc.constraint_schema = #{scope[:schema]}
AND rc.table_name = #{scope[:name]}
SQL
fk_info.map do |row|
options = {
column: row["column"],
name: row["name"],
primary_key: row["primary_key"]
}
options[:on_update] = extract_foreign_key_action(row["on_update"])
options[:on_delete] = extract_foreign_key_action(row["on_delete"])
ForeignKeyDefinition.new(table_name, row["to_table"], options)
end
end
def table_options(table_name) # :nodoc:
table_options = {}
create_table_info = create_table_info(table_name)
# strip create_definitions and partition_options
raw_table_options = create_table_info.sub(/\A.*\n\) /m, "").sub(/\n\/\*!.*\*\/\n\z/m, "").strip
# strip AUTO_INCREMENT
raw_table_options.sub!(/(ENGINE=\w+)(?: AUTO_INCREMENT=\d+)/, '\1')
table_options[:options] = raw_table_options
# strip COMMENT
if raw_table_options.sub!(/ COMMENT='.+'/, "")
table_options[:comment] = table_comment(table_name)
end
table_options
end
# SHOW VARIABLES LIKE 'name'
def show_variable(name)
query_value("SELECT @@#{name}", "SCHEMA")
rescue ActiveRecord::StatementInvalid
nil
end
def primary_keys(table_name) # :nodoc:
raise ArgumentError unless table_name.present?
scope = quoted_scope(table_name)
query_values(<<~SQL, "SCHEMA")
SELECT column_name
FROM information_schema.key_column_usage
WHERE constraint_name = 'PRIMARY'
AND table_schema = #{scope[:schema]}
AND table_name = #{scope[:name]}
ORDER BY ordinal_position
SQL
end
def default_uniqueness_comparison(attribute, value, klass) # :nodoc:
column = column_for_attribute(attribute)
if column.collation && !column.case_sensitive? && !value.nil?
ActiveSupport::Deprecation.warn(<<~MSG.squish)
Uniqueness validator will no longer enforce case sensitive comparison in Rails 6.1.
To continue case sensitive comparison on the :#{attribute.name} attribute in #{klass} model,
pass `case_sensitive: true` option explicitly to the uniqueness validator.
MSG
attribute.eq(Arel::Nodes::Bin.new(value))
else
super
end
end
def case_sensitive_comparison(attribute, value) # :nodoc:
column = column_for_attribute(attribute)
if column.collation && !column.case_sensitive?
attribute.eq(Arel::Nodes::Bin.new(value))
else
super
end
end
def can_perform_case_insensitive_comparison_for?(column)
column.case_sensitive?
end
private :can_perform_case_insensitive_comparison_for?
# In MySQL 5.7.5 and up, ONLY_FULL_GROUP_BY affects handling of queries that use
# DISTINCT and ORDER BY. It requires the ORDER BY columns in the select list for
# distinct queries, and requires that the ORDER BY include the distinct column.
# See https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html
def columns_for_distinct(columns, orders) # :nodoc:
order_columns = orders.reject(&:blank?).map { |s|
# Convert Arel node to string
s = s.to_sql unless s.is_a?(String)
# Remove any ASC/DESC modifiers
s.gsub(/\s+(?:ASC|DESC)\b/i, "")
}.reject(&:blank?).map.with_index { |column, i| "#{column} AS alias_#{i}" }
(order_columns << super).join(", ")
end
def strict_mode?
self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
end
def default_index_type?(index) # :nodoc:
index.using == :btree || super
end
def build_insert_sql(insert) # :nodoc:
sql = +"INSERT #{insert.into} #{insert.values_list}"
if insert.skip_duplicates?
any_column = quote_column_name(insert.model.columns.first.name)
sql << " ON DUPLICATE KEY UPDATE #{any_column}=#{any_column}"
elsif insert.update_duplicates?
sql << " ON DUPLICATE KEY UPDATE "
sql << insert.updatable_columns.map { |column| "#{column}=VALUES(#{column})" }.join(",")
end
sql
end
private
def check_version
if version < "5.5.8"
raise "Your version of MySQL (#{version_string}) is too old. Active Record supports MySQL >= 5.5.8."
end
end
def initialize_type_map(m = type_map)
super
register_class_with_limit m, %r(char)i, MysqlString
m.register_type %r(tinytext)i, Type::Text.new(limit: 2**8 - 1)
m.register_type %r(tinyblob)i, Type::Binary.new(limit: 2**8 - 1)
m.register_type %r(text)i, Type::Text.new(limit: 2**16 - 1)
m.register_type %r(blob)i, Type::Binary.new(limit: 2**16 - 1)
m.register_type %r(mediumtext)i, Type::Text.new(limit: 2**24 - 1)
m.register_type %r(mediumblob)i, Type::Binary.new(limit: 2**24 - 1)
m.register_type %r(longtext)i, Type::Text.new(limit: 2**32 - 1)
m.register_type %r(longblob)i, Type::Binary.new(limit: 2**32 - 1)
m.register_type %r(^float)i, Type::Float.new(limit: 24)
m.register_type %r(^double)i, Type::Float.new(limit: 53)
register_integer_type m, %r(^bigint)i, limit: 8
register_integer_type m, %r(^int)i, limit: 4
register_integer_type m, %r(^mediumint)i, limit: 3
register_integer_type m, %r(^smallint)i, limit: 2
register_integer_type m, %r(^tinyint)i, limit: 1
m.register_type %r(^tinyint\(1\))i, Type::Boolean.new if emulate_booleans
m.alias_type %r(year)i, "integer"
m.alias_type %r(bit)i, "binary"
m.register_type(%r(enum)i) do |sql_type|
limit = sql_type[/^enum\s*\((.+)\)/i, 1]
.split(",").map { |enum| enum.strip.length - 2 }.max
MysqlString.new(limit: limit)
end
m.register_type(%r(^set)i) do |sql_type|
limit = sql_type[/^set\s*\((.+)\)/i, 1]
.split(",").map { |set| set.strip.length - 1 }.sum - 1
MysqlString.new(limit: limit)
end
end
def register_integer_type(mapping, key, options)
mapping.register_type(key) do |sql_type|
if /\bunsigned\b/.match?(sql_type)
Type::UnsignedInteger.new(options)
else
Type::Integer.new(options)
end
end
end
def extract_precision(sql_type)
if /\A(?:date)?time(?:stamp)?\b/.match?(sql_type)
super || 0
else
super
end
end
# See https://dev.mysql.com/doc/refman/5.7/en/error-messages-server.html
ER_DUP_ENTRY = 1062
ER_NOT_NULL_VIOLATION = 1048
ER_NO_REFERENCED_ROW = 1216
ER_ROW_IS_REFERENCED = 1217
ER_DO_NOT_HAVE_DEFAULT = 1364
ER_ROW_IS_REFERENCED_2 = 1451
ER_NO_REFERENCED_ROW_2 = 1452
ER_DATA_TOO_LONG = 1406
ER_OUT_OF_RANGE = 1264
ER_LOCK_DEADLOCK = 1213
ER_CANNOT_ADD_FOREIGN = 1215
ER_CANNOT_CREATE_TABLE = 1005
ER_LOCK_WAIT_TIMEOUT = 1205
ER_QUERY_INTERRUPTED = 1317
ER_QUERY_TIMEOUT = 3024
ER_FK_INCOMPATIBLE_COLUMNS = 3780
def translate_exception(exception, message:, sql:, binds:)
case error_number(exception)
when ER_DUP_ENTRY
RecordNotUnique.new(message, sql: sql, binds: binds)
when ER_NO_REFERENCED_ROW, ER_ROW_IS_REFERENCED, ER_ROW_IS_REFERENCED_2, ER_NO_REFERENCED_ROW_2
InvalidForeignKey.new(message, sql: sql, binds: binds)
when ER_CANNOT_ADD_FOREIGN, ER_FK_INCOMPATIBLE_COLUMNS
mismatched_foreign_key(message, sql: sql, binds: binds)
when ER_CANNOT_CREATE_TABLE
if message.include?("errno: 150")
mismatched_foreign_key(message, sql: sql, binds: binds)
else
super
end
when ER_DATA_TOO_LONG
ValueTooLong.new(message, sql: sql, binds: binds)
when ER_OUT_OF_RANGE
RangeError.new(message, sql: sql, binds: binds)
when ER_NOT_NULL_VIOLATION, ER_DO_NOT_HAVE_DEFAULT
NotNullViolation.new(message, sql: sql, binds: binds)
when ER_LOCK_DEADLOCK
Deadlocked.new(message, sql: sql, binds: binds)
when ER_LOCK_WAIT_TIMEOUT
LockWaitTimeout.new(message, sql: sql, binds: binds)
when ER_QUERY_TIMEOUT
StatementTimeout.new(message, sql: sql, binds: binds)
when ER_QUERY_INTERRUPTED
QueryCanceled.new(message, sql: sql, binds: binds)
else
super
end
end
def change_column_for_alter(table_name, column_name, type, options = {})
column = column_for(table_name, column_name)
type ||= column.sql_type
unless options.key?(:default)
options[:default] = column.default
end
unless options.key?(:null)
options[:null] = column.null
end
unless options.key?(:comment)
options[:comment] = column.comment
end
td = create_table_definition(table_name)
cd = td.new_column_definition(column.name, type, options)
schema_creation.accept(ChangeColumnDefinition.new(cd, column.name))
end
def rename_column_for_alter(table_name, column_name, new_column_name)
column = column_for(table_name, column_name)
options = {
default: column.default,
null: column.null,
auto_increment: column.auto_increment?
}
current_type = exec_query("SHOW COLUMNS FROM #{quote_table_name(table_name)} LIKE #{quote(column_name)}", "SCHEMA").first["Type"]
td = create_table_definition(table_name)
cd = td.new_column_definition(new_column_name, current_type, options)
schema_creation.accept(ChangeColumnDefinition.new(cd, column.name))
end
def add_index_for_alter(table_name, column_name, options = {})
index_name, index_type, index_columns, _, index_algorithm, index_using = add_index_options(table_name, column_name, options)
index_algorithm[0, 0] = ", " if index_algorithm.present?
"ADD #{index_type} INDEX #{quote_column_name(index_name)} #{index_using} (#{index_columns})#{index_algorithm}"
end
def remove_index_for_alter(table_name, options = {})
index_name = index_name_for_remove(table_name, options)
"DROP INDEX #{quote_column_name(index_name)}"
end
def add_timestamps_for_alter(table_name, options = {})
options[:null] = false if options[:null].nil?
if !options.key?(:precision) && supports_datetime_with_precision?
options[:precision] = 6
end
[add_column_for_alter(table_name, :created_at, :datetime, options), add_column_for_alter(table_name, :updated_at, :datetime, options)]
end
def remove_timestamps_for_alter(table_name, options = {})
[remove_column_for_alter(table_name, :updated_at), remove_column_for_alter(table_name, :created_at)]
end
def supports_rename_index?
mariadb? ? false : version >= "5.7.6"
end
def configure_connection
variables = @config.fetch(:variables, {}).stringify_keys
# By default, MySQL 'where id is null' selects the last inserted id; Turn this off.
variables["sql_auto_is_null"] = 0
# Increase timeout so the server doesn't disconnect us.
wait_timeout = self.class.type_cast_config_to_integer(@config[:wait_timeout])
wait_timeout = 2147483 unless wait_timeout.is_a?(Integer)
variables["wait_timeout"] = wait_timeout
defaults = [":default", :default].to_set
# Make MySQL reject illegal values rather than truncating or blanking them, see
# https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sqlmode_strict_all_tables
# If the user has provided another value for sql_mode, don't replace it.
if sql_mode = variables.delete("sql_mode")
sql_mode = quote(sql_mode)
elsif !defaults.include?(strict_mode?)
if strict_mode?
sql_mode = "CONCAT(@@sql_mode, ',STRICT_ALL_TABLES')"
else
sql_mode = "REPLACE(@@sql_mode, 'STRICT_TRANS_TABLES', '')"
sql_mode = "REPLACE(#{sql_mode}, 'STRICT_ALL_TABLES', '')"
sql_mode = "REPLACE(#{sql_mode}, 'TRADITIONAL', '')"
end
sql_mode = "CONCAT(#{sql_mode}, ',NO_AUTO_VALUE_ON_ZERO')"
end
sql_mode_assignment = "@@SESSION.sql_mode = #{sql_mode}, " if sql_mode
# NAMES does not have an equals sign, see
# https://dev.mysql.com/doc/refman/5.7/en/set-names.html
# (trailing comma because variable_assignments will always have content)
if @config[:encoding]
encoding = +"NAMES #{@config[:encoding]}"
encoding << " COLLATE #{@config[:collation]}" if @config[:collation]
encoding << ", "
end
# Gather up all of the SET variables...
variable_assignments = variables.map do |k, v|
if defaults.include?(v)
"@@SESSION.#{k} = DEFAULT" # Sets the value to the global or compile default
elsif !v.nil?
"@@SESSION.#{k} = #{quote(v)}"
end
# or else nil; compact to clear nils out
end.compact.join(", ")
# ...and send them all in one query
execute "SET #{encoding} #{sql_mode_assignment} #{variable_assignments}"
end
def column_definitions(table_name) # :nodoc:
execute_and_free("SHOW FULL FIELDS FROM #{quote_table_name(table_name)}", "SCHEMA") do |result|
each_hash(result)
end
end
def create_table_info(table_name) # :nodoc:
exec_query("SHOW CREATE TABLE #{quote_table_name(table_name)}", "SCHEMA").first["Create Table"]
end
def arel_visitor
Arel::Visitors::MySQL.new(self)
end
def build_statement_pool
StatementPool.new(self.class.type_cast_config_to_integer(@config[:statement_limit]))
end
def mismatched_foreign_key(message, sql:, binds:)
match = %r/
(?:CREATE|ALTER)\s+TABLE\s*(?:`?\w+`?\.)?`?(?<table>\w+)`?.+?
FOREIGN\s+KEY\s*\(`?(?<foreign_key>\w+)`?\)\s*
REFERENCES\s*(`?(?<target_table>\w+)`?)\s*\(`?(?<primary_key>\w+)`?\)
/xmi.match(sql)
options = {
message: message,
sql: sql,
binds: binds,
}
if match
options[:table] = match[:table]
options[:foreign_key] = match[:foreign_key]
options[:target_table] = match[:target_table]
options[:primary_key] = match[:primary_key]
options[:primary_key_column] = column_for(match[:target_table], match[:primary_key])
end
MismatchedForeignKey.new(options)
end
def version_string
full_version.match(/^(?:5\.5\.5-)?(\d+\.\d+\.\d+)/)[1]
end
class MysqlString < Type::String # :nodoc:
def serialize(value)
case value
when true then "1"
when false then "0"
else super
end
end
private
def cast_value(value)
case value
when true then "1"
when false then "0"
else super
end
end
end
ActiveRecord::Type.register(:string, MysqlString, adapter: :mysql2)
ActiveRecord::Type.register(:unsigned_integer, Type::UnsignedInteger, adapter: :mysql2)
end
end
end
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