mysql2/lib/sequel/adapters/mysql2.rb

239 lines
8.5 KiB
Ruby

require 'mysql2' unless defined? Mysql2
Sequel.require %w'shared/mysql utils/stored_procedures', 'adapters'
module Sequel
# Module for holding all MySQL-related classes and modules for Sequel.
module Mysql2
# Mapping of type numbers to conversion procs
MYSQL_TYPES = {}
MYSQL2_LITERAL_PROC = lambda{|v| v}
# Use only a single proc for each type to save on memory
MYSQL_TYPE_PROCS = {
[0, 246] => MYSQL2_LITERAL_PROC, # decimal
[1] => lambda{|v| convert_tinyint_to_bool ? v != 0 : v}, # tinyint
[2, 3, 8, 9, 13, 247, 248] => MYSQL2_LITERAL_PROC, # integer
[4, 5] => MYSQL2_LITERAL_PROC, # float
[10, 14] => MYSQL2_LITERAL_PROC, # date
[7, 12] => MYSQL2_LITERAL_PROC, # datetime
[11] => MYSQL2_LITERAL_PROC, # time
[249, 250, 251, 252] => lambda{|v| Sequel::SQL::Blob.new(v)} # blob
}
MYSQL_TYPE_PROCS.each do |k,v|
k.each{|n| MYSQL_TYPES[n] = v}
end
@convert_invalid_date_time = false
@convert_tinyint_to_bool = true
class << self
# By default, Sequel raises an exception if in invalid date or time is used.
# However, if this is set to nil or :nil, the adapter treats dates
# like 0000-00-00 and times like 838:00:00 as nil values. If set to :string,
# it returns the strings as is.
attr_accessor :convert_invalid_date_time
# Sequel converts the column type tinyint(1) to a boolean by default when
# using the native MySQL adapter. You can turn off the conversion by setting
# this to false.
attr_accessor :convert_tinyint_to_bool
end
# Database class for MySQL databases used with Sequel.
class Database < Sequel::Database
include Sequel::MySQL::DatabaseMethods
# Mysql::Error messages that indicate the current connection should be disconnected
MYSQL_DATABASE_DISCONNECT_ERRORS = /\A(Commands out of sync; you can't run this command now|Can't connect to local MySQL server through socket|MySQL server has gone away)/
set_adapter_scheme :mysql2
# Support stored procedures on MySQL
def call_sproc(name, opts={}, &block)
args = opts[:args] || []
execute("CALL #{name}#{args.empty? ? '()' : literal(args)}", opts.merge(:sproc=>false), &block)
end
# 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)
# * :compress - Set to false to not compress results from the server
# * :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.
# * :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.
def connect(server)
opts = server_opts(server)
conn = ::Mysql2::Client.new({
:host => opts[:host] || 'localhost',
:username => opts[:user],
:password => opts[:password],
:database => opts[:database],
:port => opts[:port],
:socket => opts[:socket]
})
# increase timeout so mysql server doesn't disconnect us
conn.query("set @@wait_timeout = #{opts[:timeout] || 2592000}")
# By default, MySQL 'where id is null' selects the last inserted id
conn.query("set SQL_AUTO_IS_NULL=0") unless opts[:auto_is_null]
conn
end
# Returns instance of Sequel::MySQL::Dataset with the given options.
def dataset(opts = nil)
Mysql2::Dataset.new(self, opts)
end
# Executes the given SQL using an available connection, yielding the
# connection if the block is given.
def execute(sql, opts={}, &block)
if opts[:sproc]
call_sproc(sql, opts, &block)
else
synchronize(opts[:server]){|conn| _execute(conn, sql, opts, &block)}
end
end
# Return the version of the MySQL server two which we are connecting.
def server_version(server=nil)
@server_version ||= (synchronize(server){|conn| conn.info[:id]})
end
private
# 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.
def _execute(conn, sql, opts)
begin
# r = log_yield(sql){conn.query(sql)}
r = conn.query(sql)
if opts[:type] == :select
yield r if r
elsif block_given?
yield conn
end
rescue ::Mysql2::Error => e
raise_error(e, :disconnect=>MYSQL_DATABASE_DISCONNECT_ERRORS.match(e.message))
end
end
# MySQL connections use the query method to execute SQL without a result
def connection_execute_method
:query
end
# The MySQL adapter main error class is Mysql::Error
def database_error_classes
[::Mysql2::Error]
end
# The database name when using the native adapter is always stored in
# the :database option.
def database_name
@opts[:database]
end
# Closes given database connection.
def disconnect_connection(c)
c.close
end
# Convert tinyint(1) type to boolean if convert_tinyint_to_bool is true
def schema_column_type(db_type)
Sequel::Mysql2.convert_tinyint_to_bool && db_type == 'tinyint(1)' ? :boolean : super
end
end
# Dataset class for MySQL datasets accessed via the native driver.
class Dataset < Sequel::Dataset
include Sequel::MySQL::DatasetMethods
include StoredProcedures
# Methods for MySQL stored procedures using the native driver.
module StoredProcedureMethods
include Sequel::Dataset::StoredProcedureMethods
private
# Execute the database stored procedure with the stored arguments.
def execute(sql, opts={}, &block)
super(@sproc_name, {:args=>@sproc_args, :sproc=>true}.merge(opts), &block)
end
# Same as execute, explicit due to intricacies of alias and super.
def execute_dui(sql, opts={}, &block)
super(@sproc_name, {:args=>@sproc_args, :sproc=>true}.merge(opts), &block)
end
end
# Delete rows matching this dataset
def delete
execute_dui(delete_sql){|c| return c.affected_rows}
end
# Yield all rows matching this dataset. If the dataset is set to
# split multiple statements, yield arrays of hashes one per statement
# instead of yielding results for all statements as hashes.
def fetch_rows(sql, &block)
execute(sql) do |r|
r.each(:symbolize_keys => true, &block)
end
self
end
# Don't allow graphing a dataset that splits multiple statements
def graph(*)
raise(Error, "Can't graph a dataset that splits multiple result sets") if opts[:split_multiple_result_sets]
super
end
# Insert a new value into this dataset
def insert(*values)
execute_dui(insert_sql(*values)){|c| return c.last_id}
end
# Replace (update or insert) the matching row.
def replace(*args)
execute_dui(replace_sql(*args)){|c| return c.last_id}
end
# Update the matching rows.
def update(values={})
execute_dui(update_sql(values)){|c| return c.affected_rows}
end
private
# Set the :type option to :select if it hasn't been set.
def execute(sql, opts={}, &block)
super(sql, {:type=>:select}.merge(opts), &block)
end
# Set the :type option to :dui if it hasn't been set.
def execute_dui(sql, opts={}, &block)
super(sql, {:type=>:dui}.merge(opts), &block)
end
# Handle correct quoting of strings using ::Mysql2#escape.
def literal_string(v)
db.synchronize{|c| "'#{c.escape(v)}'"}
end
end
end
end