### Home Classes Methods

### In Files

- lib/sequel/adapters/mysql2.rb

### Parent

Sequel::Database

### Methods

- ::new
- #_execute
- #connect
- #connection_execute_method
- #database_error_classes
- #database_name
- #disconnect_connection
- #disconnect_error?
- #schema_column_type
- #server_version

### Included Modules

- Sequel::MySQL::DatabaseMethods
- Sequel::MySQL::PreparedStatements::DatabaseMethods

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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# Sequel::Mysql2::Database

Database class for MySQL databases used with Sequel.

### Constants

MYSQL_DATABASE_DISCONNECT_ERRORS

  Mysql::Error messages that indicate the current connection should be disconnected

### Attributes

convert_tinyint_to_bool[RW]

Whether to convert tinyint columns to bool for this database

### Public Class Methods

new(opts={}) click to toggle source

Set the convert_tinyint_to_bool setting based on the default value.

        # File lib/sequel/adapters/mysql2.rb, line 21
    21:       def initialize(opts={})
    22:         super
    23:         self.convert_tinyint_to_bool = Sequel::MySQL.convert_tinyint_to_bool
    24:       end

### Public Instance Methods

connect(server) click to toggle source

Connect to the database. In addition to the usual database options, the following options have effect:

- :auto_is_null - Set to true to use MySQL default behavior of having a filter for an autoincrement column equals NULL to return the last inserted row.

- :charset - Same as :encoding (:encoding takes precendence)

- :config_default_group - The default group to read from the in the MySQL config file.

- :config_local_infile - If provided, sets the Mysql::OPT_LOCAL_INFILE option on the connection with the given value.

- :connect_timeout - Set the timeout in seconds before a connection attempt is abandoned.

- :encoding - Set all the related character sets for this connection (connection, client, database, server, and results).

- :socket - Use a unix socket file instead of connecting via TCP/IP.

- :timeout - Set the timeout in seconds before the server will disconnect this connection (a.k.a. @@wait_timeout).

        # File lib/sequel/adapters/mysql2.rb, line 44
    44:       def connect(server)
    45:         opts = server_opts(server)
    46:         opts[:host] ||= 'localhost'
    47:         opts[:username] ||= opts[:user]
    48:         opts[:flags] = ::Mysql2::Client::FOUND_ROWS if ::Mysql2::Client.const_defined?(:FOUND_ROWS)
    49:         conn = ::Mysql2::Client.new(opts)
    50:
    51:         sqls = []
    52:         # Set encoding a slightly different way after connecting,
    53:         # in case the READ_DEFAULT_GROUP overrode the provided encoding.
    54:         # Doesn't work across implicit reconnects, but Sequel doesn't turn on
    55:         # that feature.
    56:         if encoding = opts[:encoding] || opts[:charset]
    57:           sqls << "SET NAMES #{conn.escape(encoding.to_s)}"
    58:         end
    59:
    60:         # Increase timeout so mysql server doesn't disconnect us.
    61:         # Value used by default is maximum allowed value on Windows.
    62:         sqls << "SET @@wait_timeout = #{opts[:timeout] || 2147483}"
    63:
    64:         # By default, MySQL 'where id is null' selects the last inserted id
    65:         sqls << "SET SQL_AUTO_IS_NULL=0" unless opts[:auto_is_null]
    66:
    67:         sqls.each{|sql| log_yield(sql){conn.query(sql)}}
    68:
    69:         add_prepared_statements_cache(conn)
    70:         conn
    71:       end

server_version(server=nil) click to toggle source

Return the version of the MySQL server two which we are connecting.

        # File lib/sequel/adapters/mysql2.rb, line 74
    74:       def server_version(server=nil)
    75:         @server_version ||= (synchronize(server){|conn| conn.server_info[:id]} || super)
    76:       end

### Private Instance Methods

_execute(conn, sql, opts) click to toggle source

Execute the given SQL on the given connection. If the :type option is :select, yield the result of the query, otherwise yield the connection if a block is given.

        # File lib/sequel/adapters/mysql2.rb, line 83
    83:       def _execute(conn, sql, opts)
    84:         begin
    85:           r = log_yield(sql){conn.query(sql, :symbolize_keys => true, :database_timezone => timezone, :application_timezone => Sequel.application_timezone)}
    86:           if opts[:type] == :select
    87:             yield r if r
    88:           elsif block_given?
    89:             yield conn
    90:           end
    91:         rescue ::Mysql2::Error => e
    92:           raise_error(e)
    93:         end
    94:       end

connection_execute_method() click to toggle source

MySQL connections use the query method to execute SQL without a result

        # File lib/sequel/adapters/mysql2.rb, line 97
    97:       def connection_execute_method
    98:         :query
    99:       end

database_error_classes() click to toggle source

The MySQL adapter main error class is Mysql2::Error

         # File lib/sequel/adapters/mysql2.rb, line 102
    102:       def database_error_classes
    103:         [::Mysql2::Error]
    104:       end

database_name() click to toggle source

The database name when using the native adapter is always stored in the :database option.

         # File lib/sequel/adapters/mysql2.rb, line 112
    112:       def database_name
    113:         @opts[:database]
    114:       end

disconnect_connection(c) click to toggle source

Closes given database connection.

         # File lib/sequel/adapters/mysql2.rb, line 117
    117:       def disconnect_connection(c)
    118:         c.close
    119:       end

disconnect_error?(e, opts) click to toggle source

         # File lib/sequel/adapters/mysql2.rb, line 106
    106:       def disconnect_error?(e, opts)
    107:         super || (e.is_a?(::Mysql2::Error) && MYSQL_DATABASE_DISCONNECT_ERRORS.match(e.message))
    108:       end

schema_column_type(db_type) click to toggle source

Convert tinyint(1) type to boolean if convert_tinyint_to_bool is true

         # File lib/sequel/adapters/mysql2.rb, line 122
    122:       def schema_column_type(db_type)
    123:         convert_tinyint_to_bool && db_type == 'tinyint(1)' ? :boolean : super
    124:       end

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