ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

Methods

charset
check_constraints
collation
create_database
current_database
drop_table
emulate_booleans
execute
foreign_keys
index_algorithms
native_database_types
new
recreate_database
rename_index
rename_table
show_variable
strict_mode?
supports_advisory_locks?
supports_bulk_alter?
supports_check_constraints?
supports_common_table_expressions?
supports_datetime_with_precision?
supports_explain?
supports_expression_index?
supports_foreign_keys?
supports_index_sort_order?
supports_indexes_in_create?
supports_insert_on_duplicate_skip?
supports_insert_on_duplicate_update?
supports_optimizer_hints?
supports_transaction_isolation?
supports_views?
supports_virtual_columns?

Constants

ER_CANNOT_ADD_FOREIGN	=	1215

ER_CANNOT_CREATE_TABLE	=	1005

ER_DATA_TOO_LONG	=	1406

ER_DB_CREATE_EXISTS	=	1007
	See dev.mysql.com/doc/mysql-errors/en/server-error-reference.html
ER_DO_NOT_HAVE_DEFAULT	=	1364

ER_DUP_ENTRY	=	1062

ER_FILSORT_ABORT	=	1028

ER_FK_INCOMPATIBLE_COLUMNS	=	3780

ER_LOCK_DEADLOCK	=	1213

ER_LOCK_WAIT_TIMEOUT	=	1205

ER_NOT_NULL_VIOLATION	=	1048

ER_NO_REFERENCED_ROW	=	1216

ER_NO_REFERENCED_ROW_2	=	1452

ER_OUT_OF_RANGE	=	1264

ER_QUERY_INTERRUPTED	=	1317

ER_QUERY_TIMEOUT	=	3024

ER_ROW_IS_REFERENCED	=	1217

ER_ROW_IS_REFERENCED_2	=	1451

NATIVE_DATABASE_TYPES	=	{ primary_key: "bigint auto_increment PRIMARY KEY", string: { name: "varchar", limit: 255 }, text: { name: "text" }, integer: { name: "int", limit: 4 }, bigint: { name: "bigint" }, 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" }, }

TYPE_MAP	=	Type::TypeMap.new.tap { \|m\| initialize_type_map(m) }

TYPE_MAP_WITH_BOOLEAN	=	Type::TypeMap.new(TYPE_MAP).tap do \|m\| m.register_type %r(^tinyint\(1\))i, Type::Boolean.new end

Class Public methods

emulate_booleans

By default, the Mysql2Adapter will consider all columns of type tinyint(1) 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

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 27
class_attribute :emulate_booleans, default: true

new(connection, logger, connection_options, config)

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 54
def initialize(connection, logger, connection_options, config)
  super(connection, logger, config)
end

Instance Public methods

charset()

Returns the database character set.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 269
def charset
  show_variable "character_set_database"
end

check_constraints(table_name)

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 413
      def check_constraints(table_name)
        if supports_check_constraints?
          scope = quoted_scope(table_name)

          sql = <<~SQL
            SELECT cc.constraint_name AS 'name',
                  cc.check_clause AS 'expression'
            FROM information_schema.check_constraints cc
            JOIN information_schema.table_constraints tc
            USING (constraint_schema, constraint_name)
            WHERE tc.table_schema = #{scope[:schema]}
              AND tc.table_name = #{scope[:name]}
              AND cc.constraint_schema = #{scope[:schema]}
          SQL
          sql += " AND cc.table_name = #{scope[:name]}" if mariadb?

          chk_info = exec_query(sql, "SCHEMA")

          chk_info.map do |row|
            options = {
              name: row["name"]
            }
            expression = row["expression"]
            expression = expression[1..-2] if expression.start_with?("(") && expression.end_with?(")")
            expression = strip_whitespace_characters(expression)
            CheckConstraintDefinition.new(table_name, expression, options)
          end
        else
          raise NotImplementedError
        end
      end

collation()

Returns the database collation strategy.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 274
def collation
  show_variable "collation_database"
end

create_database(name, options = {})

Create a new MySQL database with optional :charset and :collation. Charset defaults to utf8mb4.

Example:

create_database 'charset_test', charset: 'latin1', collation: 'latin1_bin'
create_database 'matt_development'
create_database 'matt_development', charset: :big5

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 244
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

current_database()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 264
def current_database
  query_value("SELECT database()", "SCHEMA")
end

drop_table(table_name, **options)

Drops a table from the database.

:force: Set to :cascade to drop dependent objects as well. Defaults to false.
:if_exists: Set to true to only drop the table if it exists. Defaults to false.
:temporary: 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.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 321
def drop_table(table_name, **options)
  schema_cache.clear_data_source_cache!(table_name.to_s)
  execute "DROP#{' TEMPORARY' if options[:temporary]} TABLE#{' IF EXISTS' if options[:if_exists]} #{quote_table_name(table_name)}#{' CASCADE' if options[:force] == :cascade}"
end

execute(sql, name = nil, async: false)

Executes the SQL statement in the context of this connection.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 194
def execute(sql, name = nil, async: false)
  raw_execute(sql, name, async: async)
end

foreign_keys(table_name)

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 377
      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: unquote_identifier(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, unquote_identifier(row["to_table"]), options)
        end
      end

index_algorithms()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 153
def index_algorithms
  {
    default: "ALGORITHM = DEFAULT",
    copy:    "ALGORITHM = COPY",
    inplace: "ALGORITHM = INPLACE",
    instant: "ALGORITHM = INSTANT",
  }
end

native_database_types()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 149
def native_database_types
  NATIVE_DATABASE_TYPES
end

recreate_database(name, options = {})

Drops the database specified on the name attribute and creates it again using the provided options.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 230
def recreate_database(name, options = {})
  drop_database(name)
  sql = create_database(name, options)
  reconnect!
  sql
end

rename_index(table_name, old_name, new_name)

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 326
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

rename_table(table_name, new_name)

Renames a table.

Example:

rename_table('octopuses', 'octopi')

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 299
def rename_table(table_name, new_name)
  schema_cache.clear_data_source_cache!(table_name.to_s)
  schema_cache.clear_data_source_cache!(new_name.to_s)
  execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
  rename_table_indexes(table_name, new_name)
end

show_variable(name)

SHOW VARIABLES LIKE ‘name’

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 475
def show_variable(name)
  query_value("SELECT @@#{name}", "SCHEMA")
rescue ActiveRecord::StatementInvalid
  nil
end

strict_mode?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 526
def strict_mode?
  self.class.type_cast_config_to_boolean(@config.fetch(:strict, true))
end

supports_advisory_locks?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 129
def supports_advisory_locks?
  true
end

supports_bulk_alter?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 68
def supports_bulk_alter?
  true
end

supports_check_constraints?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 96
def supports_check_constraints?
  if mariadb?
    database_version >= "10.2.1"
  else
    database_version >= "8.0.16"
  end
end

supports_common_table_expressions?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 121
def supports_common_table_expressions?
  if mariadb?
    database_version >= "10.2.1"
  else
    database_version >= "8.0.1"
  end
end

supports_datetime_with_precision?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 108
def supports_datetime_with_precision?
  mariadb? || database_version >= "5.6.4"
end

supports_explain?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 84
def supports_explain?
  true
end

supports_expression_index?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 76
def supports_expression_index?
  !mariadb? && database_version >= "8.0.13"
end

supports_foreign_keys?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 92
def supports_foreign_keys?
  true
end

supports_index_sort_order?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 72
def supports_index_sort_order?
  !mariadb? && database_version >= "8.0.1"
end

supports_indexes_in_create?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 88
def supports_indexes_in_create?
  true
end

supports_insert_on_duplicate_skip?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 133
def supports_insert_on_duplicate_skip?
  true
end

supports_insert_on_duplicate_update?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 137
def supports_insert_on_duplicate_update?
  true
end

supports_optimizer_hints?()

See dev.mysql.com/doc/refman/en/optimizer-hints.html for more details.

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 117
def supports_optimizer_hints?
  !mariadb? && database_version >= "5.7.7"
end

supports_transaction_isolation?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 80
def supports_transaction_isolation?
  true
end

supports_views?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 104
def supports_views?
  true
end

supports_virtual_columns?()

Source:

# File activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb, line 112
def supports_virtual_columns?
  mariadb? || database_version >= "5.7.5"
end

ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter < ActiveRecord::ConnectionAdapters::AbstractAdapter

Methods

Constants

Class Public methods

emulate_booleans

new(connection, logger, connection_options, config)

Instance Public methods

charset()

check_constraints(table_name)

collation()

create_database(name, options = {})

current_database()

drop_table(table_name, **options)

execute(sql, name = nil, async: false)

foreign_keys(table_name)

index_algorithms()

native_database_types()

recreate_database(name, options = {})

rename_index(table_name, old_name, new_name)

rename_table(table_name, new_name)

show_variable(name)

strict_mode?()

supports_advisory_locks?()

supports_bulk_alter?()

supports_check_constraints?()

supports_common_table_expressions?()

supports_datetime_with_precision?()

supports_explain?()

supports_expression_index?()

supports_foreign_keys?()

supports_index_sort_order?()

supports_indexes_in_create?()

supports_insert_on_duplicate_skip?()

supports_insert_on_duplicate_update?()

supports_optimizer_hints?()

supports_transaction_isolation?()

supports_views?()

supports_virtual_columns?()