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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'
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
ConnectionAdapters::MysqlAdapter.new(
Mysql::real_connect(host, username, password, database, port, socket), logger
)
end
end
module ConnectionAdapters
class MysqlAdapter < AbstractAdapter # :nodoc:
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 columns(table_name, name = nil)
sql = "SHOW FIELDS FROM #{table_name}"
result = nil
log(sql, name, @connection) { |connection| result = connection.query(sql) }
columns = []
result.each { |field| columns << Column.new(field[0], field[4], field[1]) }
columns
end
def insert(sql, name = nil, pk = nil, id_value = nil)
execute(sql, name = nil)
return id_value || @connection.insert_id
end
def execute(sql, name = nil)
log(sql, name, @connection) { |connection| connection.query(sql) }
end
alias_method :update, :execute
alias_method :delete, :execute
def begin_db_transaction
begin
execute "BEGIN"
rescue Exception
# Transactions aren't supported
end
end
def commit_db_transaction
begin
execute "COMMIT"
rescue Exception
# Transactions aren't supported
end
end
def rollback_db_transaction
begin
execute "ROLLBACK"
rescue Exception
# Transactions aren't supported
end
end
def quote_column_name(name)
return "`#{name}`"
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 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
private
def select(sql, name = nil)
result = nil
log(sql, name, @connection) { |connection| connection.query_with_result = true; result = connection.query(sql) }
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) }
rows
end
end
end
end
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