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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"
require "active_support/core_ext/string/strip"
module ActiveRecord
module ConnectionAdapters
class AbstractMysqlAdapter < AbstractAdapter
include MySQL::Quoting
include MySQL::ColumnDumper
include MySQL::SchemaStatements
def update_table_definition(table_name, base) # :nodoc:
MySQL::Table.new(table_name, base)
end
##
# :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
self.emulate_booleans = true
NATIVE_DATABASE_TYPES = {
primary_key: "bigint auto_increment PRIMARY KEY",
string: { name: "varchar", limit: 255 },
text: { name: "text", limit: 65535 },
integer: { name: "int", limit: 4 },
float: { name: "float" },
decimal: { name: "decimal" },
datetime: { name: "datetime" },
timestamp: { name: "timestamp" },
time: { name: "time" },
date: { name: "date" },
binary: { name: "blob", limit: 65535 },
boolean: { name: "tinyint", limit: 1 },
json: { name: "json" },
}
class StatementPool < ConnectionAdapters::StatementPool
private def dealloc(stmt)
stmt[:stmt].close
end
end
def initialize(connection, logger, connection_options, config)
super(connection, logger, config)
@statements = StatementPool.new(self.class.type_cast_config_to_integer(config[:statement_limit]))
if version < "5.1.10"
raise "Your version of MySQL (#{full_version.match(/^\d+\.\d+\.\d+/)[0]}) is too old. Active Record supports MySQL >= 5.1.10."
end
end
def version #:nodoc:
@version ||= Version.new(full_version.match(/^\d+\.\d+\.\d+/)[0])
end
def mariadb? # :nodoc:
/mariadb/i.match?(full_version)
end
def supports_bulk_alter? #:nodoc:
true
end
# Returns true, since this connection adapter supports prepared statement
# caching.
def supports_statement_cache?
true
end
def supports_index_sort_order?
!mariadb? && version >= "8.0.1"
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?
if mariadb?
version >= "5.3.0"
else
version >= "5.6.4"
end
end
def supports_virtual_columns?
if mariadb?
version >= "5.2.0"
else
version >= "5.7.5"
end
end
def supports_advisory_locks?
true
end
def get_advisory_lock(lock_name, timeout = 0) # :nodoc:
select_value("SELECT GET_LOCK(#{quote(lock_name)}, #{timeout})") == 1
end
def release_advisory_lock(lock_name) # :nodoc:
select_value("SELECT RELEASE_LOCK(#{quote(lock_name)})") == 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 = select_value("SELECT @@FOREIGN_KEY_CHECKS")
begin
update("SET FOREIGN_KEY_CHECKS = 0")
yield
ensure
update("SET FOREIGN_KEY_CHECKS = #{old}")
end
end
# CONNECTION MANAGEMENT ====================================
# Clears the prepared statements cache.
def clear_cache!
reload_type_map
@statements.clear
end
#--
# DATABASE STATEMENTS ======================================
#++
def explain(arel, binds = [])
sql = "EXPLAIN #{to_sql(arel, binds)}"
start = Time.now
result = exec_query(sql, "EXPLAIN", binds)
elapsed = Time.now - start
MySQL::ExplainPrettyPrinter.new.pp(result, elapsed)
end
# Executes the SQL statement in the context of this connection.
def execute(sql, name = nil)
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
# In the simple case, MySQL allows us to place JOINs directly into the UPDATE
# query. However, this does not allow for LIMIT, OFFSET and ORDER. To support
# these, we must use a subquery.
def join_to_update(update, select, key) # :nodoc:
if select.limit || select.offset || select.orders.any?
super
else
update.table select.source
update.wheres = select.constraints
end
end
def empty_insert_statement_value
"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 utf8.
#
# 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 CHARACTER SET #{quote_table_name(options[:charset] || 'utf8')} COLLATE #{quote_table_name(options[:collation])}"
else
execute "CREATE DATABASE #{quote_table_name(name)} DEFAULT CHARACTER SET #{quote_table_name(options[:charset] || 'utf8')}"
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
select_value "SELECT DATABASE() as db"
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 truncate(table_name, name = nil)
execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name
end
def table_comment(table_name) # :nodoc:
scope = quoted_scope(table_name)
select_value(<<-SQL.strip_heredoc, "SCHEMA")
SELECT table_comment
FROM information_schema.tables
WHERE table_schema = #{scope[:schema]}
AND table_name = #{scope[:name]}
SQL
end
def create_table(table_name, **options) #:nodoc:
super(table_name, options: "ENGINE=InnoDB", **options)
end
def bulk_change_table(table_name, operations) #:nodoc:
sqls = operations.flat_map do |command, args|
table, arguments = args.shift, args
method = :"#{command}_sql"
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
# 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)
column = column_for(table_name, column_name)
change_column table_name, column_name, column.sql_type, default: default
end
def change_column_null(table_name, column_name, null, default = nil) #:nodoc:
column = column_for(table_name, column_name)
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, column.sql_type, null: null
end
def change_column(table_name, column_name, type, options = {}) #:nodoc:
execute("ALTER TABLE #{quote_table_name(table_name)} #{change_column_sql(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_sql(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 = select_all(<<-SQL.strip_heredoc, "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.key_column_usage fk
JOIN information_schema.referential_constraints rc
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.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
# Maps logical Rails types to MySQL-specific data types.
def type_to_sql(type, limit: nil, precision: nil, scale: nil, unsigned: nil, **) # :nodoc:
sql = \
case type.to_s
when "integer"
integer_to_sql(limit)
when "text"
text_to_sql(limit)
when "blob"
binary_to_sql(limit)
when "binary"
if (0..0xfff) === limit
"varbinary(#{limit})"
else
binary_to_sql(limit)
end
else
super
end
sql << " unsigned" if unsigned && type != :primary_key
sql
end
# SHOW VARIABLES LIKE 'name'
def show_variable(name)
select_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)
select_values(<<-SQL.strip_heredoc, "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 case_sensitive_comparison(table, attribute, column, value) # :nodoc:
if column.collation && !column.case_sensitive?
table[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}" }
[super, *order_columns].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
private
def initialize_type_map(m)
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)
m.register_type %r(^json)i, MysqlJson.new
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\((.+)\)/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\((.+)\)/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
def add_index_length(quoted_columns, **options)
if length = options[:length]
case length
when Hash
length = length.symbolize_keys
quoted_columns.each { |name, column| column << "(#{length[name]})" if length[name].present? }
when Integer
quoted_columns.each { |name, column| column << "(#{length})" }
end
end
quoted_columns
end
def add_options_for_index_columns(quoted_columns, **options)
quoted_columns = add_index_length(quoted_columns, options)
super
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_DO_NOT_HAVE_DEFAULT = 1364
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
def translate_exception(exception, message)
case error_number(exception)
when ER_DUP_ENTRY
RecordNotUnique.new(message)
when ER_NO_REFERENCED_ROW_2
InvalidForeignKey.new(message)
when ER_CANNOT_ADD_FOREIGN
mismatched_foreign_key(message)
when ER_CANNOT_CREATE_TABLE
if message.include?("errno: 150")
mismatched_foreign_key(message)
else
super
end
when ER_DATA_TOO_LONG
ValueTooLong.new(message)
when ER_OUT_OF_RANGE
RangeError.new(message)
when ER_NOT_NULL_VIOLATION, ER_DO_NOT_HAVE_DEFAULT
NotNullViolation.new(message)
when ER_LOCK_DEADLOCK
Deadlocked.new(message)
else
super
end
end
def add_column_sql(table_name, column_name, type, options = {})
td = create_table_definition(table_name)
cd = td.new_column_definition(column_name, type, options)
schema_creation.accept(AddColumnDefinition.new(cd))
end
def change_column_sql(table_name, column_name, type, options = {})
column = column_for(table_name, column_name)
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_sql(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 = select_one("SHOW COLUMNS FROM #{quote_table_name(table_name)} LIKE '#{column_name}'", "SCHEMA")["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 remove_column_sql(table_name, column_name, type = nil, options = {})
"DROP #{quote_column_name(column_name)}"
end
def remove_columns_sql(table_name, *column_names)
column_names.map { |column_name| remove_column_sql(table_name, column_name) }
end
def add_index_sql(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_sql(table_name, options = {})
index_name = index_name_for_remove(table_name, options)
"DROP INDEX #{index_name}"
end
def add_timestamps_sql(table_name, options = {})
[add_column_sql(table_name, :created_at, :datetime, options), add_column_sql(table_name, :updated_at, :datetime, options)]
end
def remove_timestamps_sql(table_name, options = {})
[remove_column_sql(table_name, :updated_at), remove_column_sql(table_name, :created_at)]
end
# MySQL is too stupid to create a temporary table for use subquery, so we have
# to give it some prompting in the form of a subsubquery. Ugh!
def subquery_for(key, select)
subsubselect = select.clone
subsubselect.projections = [key]
# Materialize subquery by adding distinct
# to work with MySQL 5.7.6 which sets optimizer_switch='derived_merge=on'
subsubselect.distinct unless select.limit || select.offset || select.orders.any?
subselect = Arel::SelectManager.new(select.engine)
subselect.project Arel.sql(key.name)
subselect.from subsubselect.as("__active_record_temp")
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
# http://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
# http://dev.mysql.com/doc/refman/5.7/en/set-statement.html#id944430
# (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:
select_one("SHOW CREATE TABLE #{quote_table_name(table_name)}")["Create Table"]
end
def arel_visitor
Arel::Visitors::MySQL.new(self)
end
def mismatched_foreign_key(message)
parts = message.scan(/`(\w+)`[ $)]/).flatten
MismatchedForeignKey.new(
self,
message: message,
table: parts[0],
foreign_key: parts[1],
target_table: parts[2],
primary_key: parts[3],
)
end
def integer_to_sql(limit) # :nodoc:
case limit
when 1; "tinyint"
when 2; "smallint"
when 3; "mediumint"
when nil, 4; "int"
when 5..8; "bigint"
else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a decimal with scale 0 instead.")
end
end
def text_to_sql(limit) # :nodoc:
case limit
when 0..0xff; "tinytext"
when nil, 0x100..0xffff; "text"
when 0x10000..0xffffff; "mediumtext"
when 0x1000000..0xffffffff; "longtext"
else raise(ActiveRecordError, "No text type has byte length #{limit}")
end
end
def binary_to_sql(limit) # :nodoc:
case limit
when 0..0xff; "tinyblob"
when nil, 0x100..0xffff; "blob"
when 0x10000..0xffffff; "mediumblob"
when 0x1000000..0xffffffff; "longblob"
else raise(ActiveRecordError, "No binary type has byte length #{limit}")
end
end
class MysqlJson < Type::Internal::AbstractJson # :nodoc:
def changed_in_place?(raw_old_value, new_value)
# Normalization is required because MySQL JSON data format includes
# the space between the elements.
super(serialize(deserialize(raw_old_value)), new_value)
end
end
class MysqlString < Type::String # :nodoc:
def serialize(value)
case value
when true then MySQL::Quoting::QUOTED_TRUE
when false then MySQL::Quoting::QUOTED_FALSE
else super
end
end
private
def cast_value(value)
case value
when true then MySQL::Quoting::QUOTED_TRUE
when false then MySQL::Quoting::QUOTED_FALSE
else super
end
end
end
ActiveRecord::Type.register(:json, MysqlJson, adapter: :mysql2)
ActiveRecord::Type.register(:string, MysqlString, adapter: :mysql2)
ActiveRecord::Type.register(:unsigned_integer, Type::UnsignedInteger, adapter: :mysql2)
end
end
end