bring the rest of the mysql adapter in, making the mysql2 adapter stand-alone
This commit is contained in:
Brian Lopez
parent
a3bcec4fb4
commit
30f1ff55fc
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@ -1,7 +1,6 @@
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# encoding: utf-8
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require 'mysql2' unless defined? Mysql2
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require 'active_record/connection_adapters/mysql_adapter'
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module ActiveRecord
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class Base
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@ -13,7 +12,26 @@ module ActiveRecord
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end
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module ConnectionAdapters
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class Mysql2Column < MysqlColumn
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class Mysql2Column < Column
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def extract_default(default)
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if sql_type =~ /blob/i || type == :text
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if default.blank?
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return null ? nil : ''
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else
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raise ArgumentError, "#{type} columns cannot have a default value: #{default.inspect}"
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end
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elsif missing_default_forged_as_empty_string?(default)
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nil
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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 has_default?
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return false if sql_type =~ /blob/i || type == :text #mysql forbids defaults on blob and text columns
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super
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end
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# Returns the Ruby class that corresponds to the abstract data type.
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def klass
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case type
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@ -41,21 +59,150 @@ module ActiveRecord
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def type_cast_code(var_name)
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nil
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end
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private
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def simplified_type(field_type)
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return :boolean if Mysql2Adapter.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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class Mysql2Adapter < MysqlAdapter
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PRIMARY = "PRIMARY".freeze
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ADAPTER_NAME = "Mysql2".freeze
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def extract_limit(sql_type)
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case sql_type
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when /blob|text/i
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case sql_type
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when /tiny/i
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255
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when /medium/i
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16777215
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when /long/i
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2147483647 # mysql only allows 2^31-1, not 2^32-1, somewhat inconsistently with the tiny/medium/normal cases
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else
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super # we could return 65535 here, but we leave it undecorated by default
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end
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when /^bigint/i; 8
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when /^int/i; 4
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when /^mediumint/i; 3
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when /^smallint/i; 2
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when /^tinyint/i; 1
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else
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super
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end
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end
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# MySQL misreports NOT NULL column default when none is given.
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# We can't detect this for columns which may have a legitimate ''
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# default (string) but we can for others (integer, datetime, boolean,
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# and the rest).
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#
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# Test whether the column has default '', is not null, and is not
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# a type allowing default ''.
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def missing_default_forged_as_empty_string?(default)
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type != :string && !null && default == ''
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end
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end
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class Mysql2Adapter < AbstractAdapter
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cattr_accessor :emulate_booleans
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self.emulate_booleans = true
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ADAPTER_NAME = 'MySQL'.freeze
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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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QUOTED_TRUE, QUOTED_FALSE = '1'.freeze, '0'.freeze
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NATIVE_DATABASE_TYPES = {
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:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY".freeze,
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:string => { :name => "varchar", :limit => 255 },
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:text => { :name => "text" },
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:integer => { :name => "int", :limit => 4 },
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:float => { :name => "float" },
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:decimal => { :name => "decimal" },
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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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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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@quoted_column_names, @quoted_table_names = {}, {}
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end
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def adapter_name
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ADAPTER_NAME
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end
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def supports_migrations?
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true
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end
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def supports_primary_key?
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true
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end
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def supports_savepoints?
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true
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end
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def native_database_types
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NATIVE_DATABASE_TYPES
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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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elsif value.kind_of?(BigDecimal)
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value.to_s("F")
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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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@quoted_column_names[name] ||= "`#{name}`"
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end
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def quote_table_name(name) #:nodoc:
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@quoted_table_names[name] ||= quote_column_name(name).gsub('.', '`.`')
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end
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def quote_string(string)
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@connection.escape(string)
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end
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def quoted_true
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QUOTED_TRUE
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end
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def quoted_false
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QUOTED_FALSE
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end
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# REFERENTIAL INTEGRITY ====================================
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def disable_referential_integrity(&block) #:nodoc:
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old = select_value("SELECT @@FOREIGN_KEY_CHECKS")
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begin
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update("SET FOREIGN_KEY_CHECKS = 0")
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yield
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ensure
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update("SET FOREIGN_KEY_CHECKS = #{old}")
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end
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end
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# CONNECTION MANAGEMENT ====================================
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def active?
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@ -88,14 +235,127 @@ module ActiveRecord
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select(sql, name)
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end
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# Executes a SQL query and returns a MySQL::Result object. Note that you have to free the Result object after you're done using it.
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def execute(sql, name = nil)
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if name == :skip_logging
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@connection.query(sql)
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else
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log(sql, name) { @connection.query(sql) }
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end
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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(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
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super sql, name
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id_value || @connection.last_id
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end
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alias :create :insert_sql
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def update_sql(sql, name = nil)
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super
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@connection.affected_rows
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end
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def begin_db_transaction
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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
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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
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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 create_savepoint
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execute("SAVEPOINT #{current_savepoint_name}")
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end
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def rollback_to_savepoint
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execute("ROLLBACK TO SAVEPOINT #{current_savepoint_name}")
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end
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def release_savepoint
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execute("RELEASE SAVEPOINT #{current_savepoint_name}")
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end
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def add_limit_offset!(sql, options)
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limit, offset = options[:limit], options[:offset]
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if limit && offset
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sql << " LIMIT #{offset.to_i}, #{sanitize_limit(limit)}"
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elsif limit
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sql << " LIMIT #{sanitize_limit(limit)}"
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elsif offset
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sql << " OFFSET #{offset.to_i}"
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end
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sql
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end
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# SCHEMA STATEMENTS ========================================
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def structure_dump
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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 #{quote_table_name(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, options = {})
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drop_database(name)
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create_database(name, options)
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end
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# Create a new MySQL database with optional <tt>:charset</tt> and <tt>:collation</tt>.
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# Charset defaults to utf8.
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#
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# Example:
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# create_database 'charset_test', :charset => 'latin1', :collation => 'latin1_bin'
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# create_database 'matt_development'
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# create_database 'matt_development', :charset => :big5
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def create_database(name, options = {})
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if options[:collation]
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execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}` COLLATE `#{options[:collation]}`"
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else
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execute "CREATE DATABASE `#{name}` DEFAULT CHARACTER SET `#{options[:charset] || 'utf8'}`"
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end
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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_value 'SELECT DATABASE() as db'
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end
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# Returns the database character set.
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def charset
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show_variable 'character_set_database'
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end
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# Returns the database collation strategy.
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def collation
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show_variable 'collation_database'
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end
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def tables(name = nil)
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tables = []
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execute("SHOW TABLES", name).each(:symbolize_keys => true) do |field|
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@ -104,6 +364,10 @@ module ActiveRecord
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tables
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end
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def drop_table(table_name, options = {})
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super(table_name, options)
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end
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def indexes(table_name, name = nil)
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indexes = []
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current_index = nil
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@ -130,6 +394,89 @@ module ActiveRecord
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columns
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end
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def create_table(table_name, options = {})
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super(table_name, options.reverse_merge(:options => "ENGINE=InnoDB"))
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end
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def rename_table(table_name, new_name)
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execute "RENAME TABLE #{quote_table_name(table_name)} TO #{quote_table_name(new_name)}"
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end
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def add_column(table_name, column_name, type, options = {})
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add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
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add_column_options!(add_column_sql, options)
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add_column_position!(add_column_sql, options)
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execute(add_column_sql)
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end
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def change_column_default(table_name, column_name, default)
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column = column_for(table_name, column_name)
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change_column table_name, column_name, column.sql_type, :default => default
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end
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def change_column_null(table_name, column_name, null, default = nil)
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column = column_for(table_name, column_name)
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unless null || default.nil?
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execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
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end
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change_column table_name, column_name, column.sql_type, :null => null
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end
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def change_column(table_name, column_name, type, options = {})
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column = column_for(table_name, column_name)
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unless options_include_default?(options)
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options[:default] = column.default
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end
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unless options.has_key?(:null)
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options[:null] = column.null
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end
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change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
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add_column_options!(change_column_sql, options)
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add_column_position!(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)
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options = {}
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if column = columns(table_name).find { |c| c.name == column_name.to_s }
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options[:default] = column.default
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options[:null] = column.null
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else
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raise ActiveRecordError, "No such column: #{table_name}.#{column_name}"
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end
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current_type = select_one("SHOW COLUMNS FROM #{quote_table_name(table_name)} LIKE '#{column_name}'")["Type"]
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rename_column_sql = "ALTER TABLE #{quote_table_name(table_name)} CHANGE #{quote_column_name(column_name)} #{quote_column_name(new_column_name)} #{current_type}"
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add_column_options!(rename_column_sql, options)
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execute(rename_column_sql)
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end
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# Maps logical Rails types to MySQL-specific data types.
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def type_to_sql(type, limit = nil, precision = nil, scale = nil)
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return super unless type.to_s == 'integer'
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case limit
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when 1; 'tinyint'
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when 2; 'smallint'
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when 3; 'mediumint'
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when nil, 4, 11; 'int(11)' # compatibility with MySQL default
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when 5..8; 'bigint'
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else raise(ActiveRecordError, "No integer type has byte size #{limit}")
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end
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end
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def add_column_position!(sql, options)
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if options[:first]
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sql << " FIRST"
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elsif options[:after]
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sql << " AFTER #{quote_column_name(options[:after])}"
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end
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end
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def show_variable(name)
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variables = select_all("SHOW VARIABLES LIKE '#{name}'")
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variables.first[:Value] unless variables.empty?
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@ -138,17 +485,55 @@ module ActiveRecord
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def pk_and_sequence_for(table)
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keys = []
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result = execute("describe #{quote_table_name(table)}")
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result.each(:symbolize_keys) do |row|
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result.each(:symbolize_keys => true) do |row|
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keys << row[:Field] if row[:Key] == "PRI"
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end
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keys.length == 1 ? [keys.first, nil] : nil
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end
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# Returns just a table's primary key
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def primary_key(table)
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pk_and_sequence = pk_and_sequence_for(table)
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pk_and_sequence && pk_and_sequence.first
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end
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def case_sensitive_equality_operator
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"= BINARY"
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end
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def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
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where_sql
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end
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protected
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# TODO: implement error_number method on Mysql2::Exception
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def translate_exception(exception, message)
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return super unless exception.respond_to?(:error_number)
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case exception.error_number
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when 1062
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RecordNotUnique.new(message, exception)
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when 1452
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InvalidForeignKey.new(message, exception)
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else
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super
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end
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end
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private
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def connect
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# no-op
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end
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def configure_connection
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encoding = @config[:encoding]
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execute("SET NAMES '#{encoding}'", :skip_logging) if encoding
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# By default, MySQL 'where id is null' selects the last inserted id.
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# Turn this off. http://dev.rubyonrails.org/ticket/6778
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execute("SET SQL_AUTO_IS_NULL=0", :skip_logging)
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end
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def select(sql, name = nil)
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execute(sql, name).to_a
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end
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@ -160,6 +545,13 @@ module ActiveRecord
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def version
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@version ||= @connection.info[:version].scan(/^(\d+)\.(\d+)\.(\d+)/).flatten.map { |v| v.to_i }
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end
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def column_for(table_name, column_name)
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unless column = columns(table_name).find { |c| c.name == column_name.to_s }
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raise "No such column: #{table_name}.#{column_name}"
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end
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column
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end
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end
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end
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end
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