Class: ActiveRecord::ConnectionAdapters::Mysql2Adapter

Inherits:
AbstractMysqlAdapter show all
Includes:
ActiveRecord::ConnectionAdapters::MySQL::DatabaseStatements
Defined in:
activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb

Constant Summary collapse

ADAPTER_NAME =
'Mysql2'.freeze

Constants inherited from AbstractMysqlAdapter

AbstractMysqlAdapter::CHARSETS_OF_4BYTES_MAXLEN, AbstractMysqlAdapter::INDEX_TYPES, AbstractMysqlAdapter::INDEX_USINGS, AbstractMysqlAdapter::NATIVE_DATABASE_TYPES

Constants inherited from AbstractAdapter

AbstractAdapter::SIMPLE_INT

Constants included from ActiveSupport::Callbacks

ActiveSupport::Callbacks::CALLBACK_FILTER_TYPES

Instance Attribute Summary

Attributes inherited from AbstractAdapter

#logger, #owner, #pool, #prepared_statements, #schema_cache, #visitor

Attributes included from QueryCache

#query_cache, #query_cache_enabled

Attributes included from DatabaseStatements

#transaction_manager

Instance Method Summary collapse

Methods included from ActiveRecord::ConnectionAdapters::MySQL::DatabaseStatements

#exec_delete, #exec_query, #execute, #select_all, #select_rows

Methods inherited from AbstractMysqlAdapter

#add_index, #add_sql_comment!, #arel_visitor, #begin_db_transaction, #begin_isolated_db_transaction, #bulk_change_table, #case_sensitive_comparison, #change_column, #change_column_default, #change_column_null, #charset, #clear_cache!, #collation, #columns, #columns_for_distinct, #commit_db_transaction, #create_database, #create_table, #current_database, #data_source_exists?, #data_sources, #disable_referential_integrity, #drop_database, #drop_table, #empty_insert_statement_value, #emulate_booleans, #exec_rollback_db_transaction, #execute, #execute_and_free, #explain, #foreign_keys, #get_advisory_lock, #index_algorithms, #indexes, #internal_string_options_for_primary_key, #join_to_update, #mariadb?, #native_database_types, #new_column, #primary_keys, #recreate_database, #release_advisory_lock, #rename_column, #rename_index, #rename_table, #schema_creation, #show_variable, #strict_mode?, #supports_advisory_locks?, #supports_bulk_alter?, #supports_datetime_with_precision?, #supports_explain?, #supports_foreign_keys?, #supports_index_sort_order?, #supports_indexes_in_create?, #supports_migrations?, #supports_primary_key?, #supports_statement_cache?, #supports_transaction_isolation?, #supports_views?, #table_comment, #table_exists?, #table_options, #tables, #truncate, #type_to_sql, #update_table_definition, #valid_type?, #version, #view_exists?, #views

Methods included from ActiveRecord::ConnectionAdapters::MySQL::ColumnDumper

#column_spec_for_primary_key, #migration_keys, #prepare_column_options

Methods included from ActiveRecord::ConnectionAdapters::MySQL::Quoting

#quote_column_name, #quote_table_name, #quoted_date, #quoted_false, #quoted_true, #unquoted_false, #unquoted_true

Methods inherited from AbstractAdapter

#adapter_name, #arel_visitor, #case_insensitive_comparison, #case_sensitive_comparison, #clear_cache!, #close, #collector, #column_name_for_operation, #combine_bind_parameters, #disable_extension, #disable_referential_integrity, #enable_extension, #expire, #extensions, #get_advisory_lock, #index_algorithms, #lease, #lookup_cast_type, #new_column, #prefetch_primary_key?, #raw_connection, #release_advisory_lock, #requires_reloading?, #schema_creation, #steal!, #supports_advisory_locks?, #supports_bulk_alter?, #supports_datetime_with_precision?, #supports_ddl_transactions?, #supports_explain?, #supports_expression_index?, #supports_extensions?, #supports_index_sort_order?, #supports_migrations?, #supports_multi_insert?, #supports_partial_index?, #supports_primary_key?, #supports_transaction_isolation?, #supports_views?, type_cast_config_to_boolean, type_cast_config_to_integer, #type_map, #unprepared_statement, #valid_type?, #verify!

Methods included from Savepoints

#create_savepoint, #current_savepoint_name, #exec_rollback_to_savepoint, #release_savepoint

Methods included from ColumnDumper

#column_spec, #column_spec_for_primary_key, #migration_keys, #prepare_column_options

Methods included from QueryCache

#cache, #clear_query_cache, dirties_query_cache, #disable_query_cache!, #enable_query_cache!, included, #select_all, #uncached

Methods included from DatabaseLimits

#allowed_index_name_length, #column_name_length, #columns_per_multicolumn_index, #columns_per_table, #in_clause_length, #index_name_length, #indexes_per_table, #joins_per_query, #sql_query_length, #table_alias_length, #table_name_length

Methods included from Quoting

#fetch_type_metadata, #lookup_cast_type_from_column, #prepare_binds_for_database, #quote, #quote_column_name, #quote_default_expression, #quote_table_name, #quote_table_name_for_assignment, #quoted_date, #quoted_false, #quoted_time, #quoted_true, #type_cast, #type_cast_from_column, #unquoted_false, #unquoted_true

Methods included from DatabaseStatements

#add_transaction_record, #begin_db_transaction, #begin_isolated_db_transaction, #cacheable_query, #commit_db_transaction, #default_sequence_name, #delete, #empty_insert_statement_value, #exec_delete, #exec_insert, #exec_query, #exec_rollback_db_transaction, #exec_update, #execute, #insert, #insert_fixture, #join_to_update, #reset_sequence!, #reset_transaction, #rollback_db_transaction, #rollback_to_savepoint, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #supports_statement_cache?, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #transaction_state, #truncate, #update

Methods included from SchemaStatements

#add_column, #add_foreign_key, #add_index, #add_index_options, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_column, #change_column_comment, #change_column_default, #change_column_null, #change_table, #change_table_comment, #column_exists?, #columns, #columns_for_distinct, #create_join_table, #create_table, #data_source_exists?, #data_sources, #drop_join_table, #drop_table, #dump_schema_information, #foreign_key_column_for, #foreign_key_exists?, #foreign_key_for, #foreign_key_for!, #foreign_key_options, #foreign_keys, #index_exists?, #index_name, #index_name_exists?, #initialize_internal_metadata_table, #initialize_schema_migrations_table, #insert_versions_sql, #internal_string_options_for_primary_key, #native_database_types, #options_include_default?, #primary_key, #remove_column, #remove_columns, #remove_foreign_key, #remove_index, #remove_reference, #remove_timestamps, #rename_column, #rename_index, #rename_table, #table_alias_for, #table_comment, #table_exists?, #table_options, #tables, #type_to_sql, #update_table_definition, #view_exists?, #views

Methods included from ActiveSupport::Callbacks

#run_callbacks

Methods included from ActiveSupport::Concern

#append_features, #class_methods, extended, #included

Constructor Details

#initialize(connection, logger, connection_options, config) ⇒ Mysql2Adapter

Returns a new instance of Mysql2Adapter.


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 42

def initialize(connection, logger, connection_options, config)
  super
  @prepared_statements = false unless config.key?(:prepared_statements)
  configure_connection
end

Instance Method Details

#active?Boolean

– CONNECTION MANAGEMENT ==================================== ++

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 92

def active?
  @connection.ping
end

#disconnect!Object

Disconnects from the database if already connected. Otherwise, this method does nothing.


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 105

def disconnect!
  super
  @connection.close
end

#each_hash(result) ⇒ Object

HELPER METHODS ===========================================


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 66

def each_hash(result) # :nodoc:
  if block_given?
    result.each(:as => :hash, :symbolize_keys => true) do |row|
      yield row
    end
  else
    to_enum(:each_hash, result)
  end
end

#error_number(exception) ⇒ Object


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 76

def error_number(exception)
  exception.error_number if exception.respond_to?(:error_number)
end

#quote_string(string) ⇒ Object

– QUOTING ================================================== ++


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 84

def quote_string(string)
  @connection.escape(string)
end

#reconnect!Object Also known as: reset!


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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 96

def reconnect!
  super
  disconnect!
  connect
end

#supports_comments?Boolean

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 52

def supports_comments?
  true
end

#supports_comments_in_create?Boolean

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 56

def supports_comments_in_create?
  true
end

#supports_json?Boolean

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 48

def supports_json?
  !mariadb? && version >= '5.7.8'
end

#supports_savepoints?Boolean

Returns:

  • (Boolean)

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# File 'activerecord/lib/active_record/connection_adapters/mysql2_adapter.rb', line 60

def supports_savepoints?
  true
end