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executable file 282 lines (238 sloc) 9.62 kB
require 'active_record/connection_adapters/abstract_adapter'
require 'parsedate'
module ActiveRecord
class Base
# Establishes a connection to the database that's used by all Active Record objects.
def self.mysql_connection(config) # :nodoc:
unless self.class.const_defined?(:Mysql)
begin
# Only include the MySQL driver if one hasn't already been loaded
require_library_or_gem 'mysql'
rescue LoadError => cannot_require_mysql
# Only use the supplied backup Ruby/MySQL driver if no driver is already in place
begin
require 'active_record/vendor/mysql'
require 'active_record/vendor/mysql411'
rescue LoadError
raise cannot_require_mysql
end
end
end
symbolize_strings_in_hash(config)
host = config[:host]
port = config[:port]
socket = config[:socket]
username = config[:username] ? config[:username].to_s : 'root'
password = config[:password].to_s
if config.has_key?(:database)
database = config[:database]
else
raise ArgumentError, "No database specified. Missing argument: database."
end
mysql = Mysql.init
mysql.ssl_set(config[:sslkey], config[:sslcert], config[:sslca], config[:sslcapath], config[:sslcipher]) if config[:sslkey]
ConnectionAdapters::MysqlAdapter.new(mysql.real_connect(host, username, password, database, port, socket), logger, [host, username, password, database, port, socket])
end
end
module ConnectionAdapters
class MysqlColumn < Column #:nodoc:
private
def simplified_type(field_type)
return :boolean if MysqlAdapter.emulate_booleans && field_type.downcase == "tinyint(1)"
super
end
end
# The MySQL adapter will work with both Ruby/MySQL, which is a Ruby-based MySQL adapter that comes bundled with Active Record, and with
# the faster C-based MySQL/Ruby adapter (available both as a gem and from http://www.tmtm.org/en/mysql/ruby/).
#
# Options:
#
# * <tt>:host</tt> -- Defaults to localhost
# * <tt>:port</tt> -- Defaults to 3306
# * <tt>:socket</tt> -- Defaults to /tmp/mysql.sock
# * <tt>:username</tt> -- Defaults to root
# * <tt>:password</tt> -- Defaults to nothing
# * <tt>:database</tt> -- The name of the database. No default, must be provided.
# * <tt>:sslkey</tt> -- Necessary to use MySQL with an SSL connection
# * <tt>:sslcert</tt> -- Necessary to use MySQL with an SSL connection
# * <tt>:sslcapath</tt> -- Necessary to use MySQL with an SSL connection
# * <tt>:sslcipher</tt> -- Necessary to use MySQL with an SSL connection
#
# By default, the MysqlAdapter will consider all columns of type tinyint(1)
# as boolean. If you wish to disable this emulation (which was the default
# behavior in versions 0.13.1 and earlier) you can add the following line
# to your environment.rb file:
#
# ActiveRecord::ConnectionAdapters::MysqlAdapter.emulate_booleans = false
class MysqlAdapter < AbstractAdapter
@@emulate_booleans = true
cattr_accessor :emulate_booleans
LOST_CONNECTION_ERROR_MESSAGES = [
"Server shutdown in progress",
"Broken pipe",
"Lost connection to MySQL server during query",
"MySQL server has gone away"
]
def supports_migrations?
true
end
def native_database_types
{
:primary_key => "int(11) DEFAULT NULL auto_increment PRIMARY KEY",
:string => { :name => "varchar", :limit => 255 },
:text => { :name => "text" },
:integer => { :name => "int", :limit => 11 },
:float => { :name => "float" },
:datetime => { :name => "datetime" },
:timestamp => { :name => "datetime" },
:time => { :name => "datetime" },
:date => { :name => "date" },
:binary => { :name => "blob" },
:boolean => { :name => "tinyint", :limit => 1 }
}
end
def initialize(connection, logger, connection_options=nil)
super(connection, logger)
@connection_options = connection_options
end
def adapter_name
'MySQL'
end
def select_all(sql, name = nil)
select(sql, name)
end
def select_one(sql, name = nil)
result = select(sql, name)
result.nil? ? nil : result.first
end
def tables(name = nil)
tables = []
execute("SHOW TABLES", name).each { |field| tables << field[0] }
tables
end
def indexes(table_name, name = nil)
indexes = []
current_index = nil
execute("SHOW KEYS FROM #{table_name}", name).each do |row|
if current_index != row[2]
next if row[2] == "PRIMARY" # skip the primary key
current_index = row[2]
indexes << IndexDefinition.new(row[0], row[2], row[1] == "0", [])
end
indexes.last.columns << row[4]
end
indexes
end
def columns(table_name, name = nil)
sql = "SHOW FIELDS FROM #{table_name}"
columns = []
execute(sql, name).each { |field| columns << MysqlColumn.new(field[0], field[4], field[1], field[2] == "YES") }
columns
end
def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
execute(sql, name = nil)
id_value || @connection.insert_id
end
def execute(sql, name = nil, retries = 2)
unless @logger
@connection.query(sql)
else
log(sql, name) { @connection.query(sql) }
end
rescue ActiveRecord::StatementInvalid => exception
if LOST_CONNECTION_ERROR_MESSAGES.any? { |msg| exception.message.split(":").first =~ /^#{msg}/ }
@connection.real_connect(*@connection_options)
unless @logger
@connection.query(sql)
else
@logger.info "Retrying invalid statement with reopened connection"
log(sql, name) { @connection.query(sql) }
end
elsif exception.message.split(":").first =~ /Packets out of order/
raise ActiveRecord::StatementInvalid, "'Packets out of order' error was received from the database. Please update your mysql bindings (gem update mysql) and read http://dev.mysql.com/doc/mysql/en/password-hashing.html for more information."
else
raise
end
end
def update(sql, name = nil)
execute(sql, name)
@connection.affected_rows
end
alias_method :delete, :update
def begin_db_transaction
execute "BEGIN"
rescue Exception
# Transactions aren't supported
end
def commit_db_transaction
execute "COMMIT"
rescue Exception
# Transactions aren't supported
end
def rollback_db_transaction
execute "ROLLBACK"
rescue Exception
# Transactions aren't supported
end
def quoted_true() "1" end
def quoted_false() "0" end
def quote_column_name(name)
"`#{name}`"
end
def quote_string(string)
Mysql::quote(string)
end
def structure_dump
select_all("SHOW TABLES").inject("") do |structure, table|
structure += select_one("SHOW CREATE TABLE #{table.to_a.first.last}")["Create Table"] + ";\n\n"
end
end
def add_limit_offset!(sql, options)
if options[:limit]
if options[:offset].blank?
sql << " LIMIT #{options[:limit]}"
else
sql << " LIMIT #{options[:offset]}, #{options[:limit]}"
end
end
end
def recreate_database(name)
drop_database(name)
create_database(name)
end
def drop_database(name)
execute "DROP DATABASE IF EXISTS #{name}"
end
def create_database(name)
execute "CREATE DATABASE #{name}"
end
def change_column_default(table_name, column_name, default)
current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"]
change_column(table_name, column_name, current_type, { :default => default })
end
def change_column(table_name, column_name, type, options = {})
options[:default] ||= select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Default"]
change_column_sql = "ALTER TABLE #{table_name} CHANGE #{column_name} #{column_name} #{type_to_sql(type, options[:limit])}"
add_column_options!(change_column_sql, options)
execute(change_column_sql)
end
def rename_column(table_name, column_name, new_column_name)
current_type = select_one("SHOW COLUMNS FROM #{table_name} LIKE '#{column_name}'")["Type"]
execute "ALTER TABLE #{table_name} CHANGE #{column_name} #{new_column_name} #{current_type}"
end
def create_table(name, options = {})
super(name, {:options => "ENGINE=InnoDB"}.merge(options))
end
private
def select(sql, name = nil)
@connection.query_with_result = true
result = execute(sql, name)
rows = []
all_fields_initialized = result.fetch_fields.inject({}) { |all_fields, f| all_fields[f.name] = nil; all_fields }
result.each_hash { |row| rows << all_fields_initialized.dup.update(row) }
result.free
rows
end
end
end
end
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