358 lines
11 KiB
Ruby
358 lines
11 KiB
Ruby
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require 'active_record/connection_adapters/abstract_adapter'
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module ActiveRecord
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class Base
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# Establishes a connection to the database that's used by all Active Record objects.
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def self.mysql_connection(config) # :nodoc:
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# Only include the MySQL driver if one hasn't already been loaded
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unless defined? Mysql
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begin
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require_library_or_gem 'mysql'
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rescue LoadError => cannot_require_mysql
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# Only use the supplied backup Ruby/MySQL driver if no driver is already in place
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begin
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require 'active_record/vendor/mysql'
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rescue LoadError
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raise cannot_require_mysql
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end
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end
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end
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config = config.symbolize_keys
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host = config[:host]
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port = config[:port]
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socket = config[:socket]
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username = config[:username] ? config[:username].to_s : 'root'
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password = config[:password].to_s
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if config.has_key?(:database)
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database = config[:database]
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else
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raise ArgumentError, "No database specified. Missing argument: database."
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end
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mysql = Mysql.init
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mysql.ssl_set(config[:sslkey], config[:sslcert], config[:sslca], config[:sslcapath], config[:sslcipher]) if config[:sslkey]
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ConnectionAdapters::MysqlAdapter.new(mysql, logger, [host, username, password, database, port, socket], config)
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end
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end
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module ConnectionAdapters
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class MysqlColumn < Column #:nodoc:
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private
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def simplified_type(field_type)
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return :boolean if MysqlAdapter.emulate_booleans && field_type.downcase.index("tinyint(1)")
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return :string if field_type =~ /enum/i
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super
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end
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end
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# The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with
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# the faster C-based MySQL/Ruby adapter (available both as a gem and from http://www.tmtm.org/en/mysql/ruby/).
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#
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# Options:
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#
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# * <tt>:host</tt> -- Defaults to localhost
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# * <tt>:port</tt> -- Defaults to 3306
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# * <tt>:socket</tt> -- Defaults to /tmp/mysql.sock
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# * <tt>:username</tt> -- Defaults to root
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# * <tt>:password</tt> -- Defaults to nothing
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# * <tt>:database</tt> -- The name of the database. No default, must be provided.
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# * <tt>:sslkey</tt> -- Necessary to use MySQL with an SSL connection
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# * <tt>:sslcert</tt> -- Necessary to use MySQL with an SSL connection
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# * <tt>:sslcapath</tt> -- Necessary to use MySQL with an SSL connection
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# * <tt>:sslcipher</tt> -- Necessary to use MySQL with an SSL connection
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#
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# By default, the MysqlAdapter will consider all columns of type tinyint(1)
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# as boolean. If you wish to disable this emulation (which was the default
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# behavior in versions 0.13.1 and earlier) you can add the following line
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# to your environment.rb file:
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#
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# ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans = false
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class MysqlAdapter < AbstractAdapter
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@@emulate_booleans = true
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cattr_accessor :emulate_booleans
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LOST_CONNECTION_ERROR_MESSAGES = [
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"Server shutdown in progress",
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"Broken pipe",
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"Lost connection to MySQL server during query",
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"MySQL server has gone away"
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]
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def initialize(connection, logger, connection_options, config)
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super(connection, logger)
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@connection_options, @config = connection_options, config
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@null_values_in_each_hash = Mysql.const_defined?(:VERSION)
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connect
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end
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def adapter_name #:nodoc:
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'MySQL'
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end
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def supports_migrations? #:nodoc:
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true
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end
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def native_database_types #:nodoc
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{
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:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY",
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:string => { :name => "varchar", :limit => 255 },
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:text => { :name => "text" },
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:integer => { :name => "int", :limit => 11 },
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:float => { :name => "float" },
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:datetime => { :name => "datetime" },
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:timestamp => { :name => "datetime" },
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:time => { :name => "time" },
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:date => { :name => "date" },
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:binary => { :name => "blob" },
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:boolean => { :name => "tinyint", :limit => 1 }
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}
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end
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# QUOTING ==================================================
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def quote(value, column = nil)
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if value.kind_of?(String) && column && column.type == :binary && column.class.respond_to?(:string_to_binary)
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s = column.class.string_to_binary(value).unpack("H*")[0]
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"x'#{s}'"
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else
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super
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end
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end
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def quote_column_name(name) #:nodoc:
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"`#{name}`"
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end
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def quote_string(string) #:nodoc:
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@connection.quote(string)
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end
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def quoted_true
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"1"
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end
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def quoted_false
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"0"
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end
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# CONNECTION MANAGEMENT ====================================
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def active?
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if @connection.respond_to?(:stat)
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@connection.stat
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else
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@connection.query 'select 1'
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end
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# mysql-ruby doesn't raise an exception when stat fails.
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if @connection.respond_to?(:errno)
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@connection.errno.zero?
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else
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true
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end
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rescue Mysql::Error
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false
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end
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def reconnect!
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disconnect!
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connect
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end
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def disconnect!
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@connection.close rescue nil
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end
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# DATABASE STATEMENTS ======================================
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def select_all(sql, name = nil) #:nodoc:
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select(sql, name)
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end
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def select_one(sql, name = nil) #:nodoc:
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result = select(sql, name)
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result.nil? ? nil : result.first
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end
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def execute(sql, name = nil, retries = 2) #:nodoc:
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log(sql, name) { @connection.query(sql) }
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rescue ActiveRecord::StatementInvalid => exception
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if exception.message.split(":").first =~ /Packets out of order/
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raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem install mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information. If you're on Windows, use the Instant Rails installer to get the updated mysql bindings."
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else
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raise
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end
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end
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def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil) #:nodoc:
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execute(sql, name = nil)
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id_value || @connection.insert_id
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end
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def update(sql, name = nil) #:nodoc:
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execute(sql, name)
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@connection.affected_rows
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end
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alias_method :delete, :update #:nodoc:
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def begin_db_transaction #:nodoc:
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execute "BEGIN"
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rescue Exception
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# Transactions aren't supported
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end
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def commit_db_transaction #:nodoc:
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execute "COMMIT"
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rescue Exception
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# Transactions aren't supported
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end
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def rollback_db_transaction #:nodoc:
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execute "ROLLBACK"
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rescue Exception
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# Transactions aren't supported
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end
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def add_limit_offset!(sql, options) #:nodoc
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if limit = options[:limit]
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unless offset = options[:offset]
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sql << " LIMIT #{limit}"
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else
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sql << " LIMIT #{offset}, #{limit}"
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end
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end
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end
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# SCHEMA STATEMENTS ========================================
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def structure_dump #:nodoc:
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if supports_views?
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sql = "SHOW FULL TABLES WHERE Table_type = 'BASE TABLE'"
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else
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sql = "SHOW TABLES"
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end
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select_all(sql).inject("") do |structure, table|
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table.delete('Table_type')
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structure += select_one("SHOW CREATE TABLE #{table.to_a.first.last}")["Create Table"] + ";\n\n"
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end
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end
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def recreate_database(name) #:nodoc:
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drop_database(name)
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create_database(name)
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end
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def create_database(name) #:nodoc:
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execute "CREATE DATABASE `#{name}`"
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end
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def drop_database(name) #:nodoc:
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execute "DROP DATABASE IF EXISTS `#{name}`"
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end
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def current_database
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select_one("SELECT DATABASE() as db")["db"]
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end
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def tables(name = nil) #:nodoc:
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tables = []
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execute("SHOW TABLES", name).each { |field| tables << field[0] }
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tables
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end
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def indexes(table_name, name = nil)#:nodoc:
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indexes = []
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current_index = nil
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execute("SHOW KEYS FROM #{table_name}", name).each do |row|
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if current_index != row[2]
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next if row[2] == "PRIMARY" # skip the primary key
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current_index = row[2]
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indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", [])
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end
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indexes.last.columns << row[4]
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end
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indexes
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end
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def columns(table_name, name = nil)#:nodoc:
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sql = "SHOW FIELDS FROM #{table_name}"
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columns = []
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execute(sql, name).each { |field| columns << MysqlColumn.new(field[0], field[4], field[1], field[2] == "YES") }
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columns
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end
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def create_table(name, options = {}) #:nodoc:
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super(name, {:options => "ENGINE=InnoDB"}.merge(options))
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end
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def rename_table(name, new_name)
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execute "RENAME TABLE #{name} TO #{new_name}"
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end
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def change_column_default(table_name, column_name, default) #:nodoc:
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current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"]
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change_column(table_name, column_name, current_type, { :default => default })
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end
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def change_column(table_name, column_name, type, options = {}) #:nodoc:
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options[:default] ||= select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Default"]
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change_column_sql = "ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{type_to_sql(type, options[:limit])}"
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add_column_options!(change_column_sql, options)
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execute(change_column_sql)
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end
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def rename_column(table_name, column_name, new_column_name) #:nodoc:
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current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"]
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execute "ALTER TABLE #{table_name} CHANGE #{column_name} #{new_column_name} #{current_type}"
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end
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private
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def connect
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encoding = @config[:encoding]
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if encoding
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@connection.options(Mysql::SET_CHARSET_NAME, encoding) rescue nil
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end
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@connection.real_connect(*@connection_options)
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execute("SET NAMES '#{encoding}'") if encoding
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end
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def select(sql, name = nil)
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@connection.query_with_result = true
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result = execute(sql, name)
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rows = []
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if @null_values_in_each_hash
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result.each_hash { |row| rows << row }
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else
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all_fields = result.fetch_fields.inject({}) { |fields, f| fields[f.name] = nil; fields }
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result.each_hash { |row| rows << all_fields.dup.update(row) }
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end
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result.free
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rows
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end
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def supports_views?
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version[0] >= 5
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end
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def version
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@version ||= @connection.server_info.scan(/^(\d+)\.(\d+)\.(\d+)/).flatten.map { |v| v.to_i }
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end
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end
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end
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end
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