class Sequel::ADO::Database
Constants
- CommandTimeout
- Provider
Attributes
Public Instance Methods
In addition to the usual database options, the following options have an effect:
- :command_timeout
-
Sets the time in seconds to wait while attempting to execute a command before cancelling the attempt and generating an error. Specifically, it sets the
ADO
CommandTimeout
property. - :driver
-
The driver to use in the
ADO
connection string. If not provided, a default of “SQL Server” is used. - :conn_string
-
The full
ADO
connection string. If this is provided, the usual options are ignored. - :provider
-
Sets the
Provider
of thisADO
connection (for example, “SQLOLEDB”). If you don't specify a provider, the default one used by WIN32OLE has major problems, such as creating a new native database connection for every query, which breaks things such as temporary tables.
Pay special attention to the :provider option, as without specifying a provider, many things will be broken. The SQLNCLI10 provider appears to work well if you are connecting to Microsoft SQL
Server, but it is not the default as that is not always available and would break backwards compatability.
# File lib/sequel/adapters/ado.rb 112 def connect(server) 113 opts = server_opts(server) 114 s = opts[:conn_string] || "driver=#{opts[:driver]};server=#{opts[:host]};database=#{opts[:database]}#{";uid=#{opts[:user]};pwd=#{opts[:password]}" if opts[:user]}" 115 handle = WIN32OLE.new('ADODB.Connection') 116 handle.CommandTimeout = opts[:command_timeout] if opts[:command_timeout] 117 handle.Provider = opts[:provider] if opts[:provider] 118 handle.Open(s) 119 handle 120 end
# File lib/sequel/adapters/ado.rb 122 def disconnect_connection(conn) 123 conn.Close 124 rescue WIN32OLERuntimeError 125 nil 126 end
# File lib/sequel/adapters/ado.rb 159 def execute(sql, opts=OPTS) 160 synchronize(opts[:server]) do |conn| 161 begin 162 r = log_connection_yield(sql, conn){conn.Execute(sql)} 163 begin 164 yield r if block_given? 165 ensure 166 begin 167 r.close 168 rescue ::WIN32OLERuntimeError 169 end 170 end 171 rescue ::WIN32OLERuntimeError => e 172 raise_error(e) 173 end 174 end 175 nil 176 end
Just execute so it doesn't attempt to return the number of rows modified.
# File lib/sequel/adapters/ado.rb 134 def execute_ddl(sql, opts=OPTS) 135 execute(sql, opts) 136 end
Use pass by reference in WIN32OLE to get the number of affected rows, unless is a provider is in use (since some providers don't seem to return the number of affected rows, but the default provider appears to).
Sequel::Database#execute_dui
# File lib/sequel/adapters/ado.rb 147 def execute_dui(sql, opts=OPTS) 148 return super if opts[:provider] 149 synchronize(opts[:server]) do |conn| 150 begin 151 log_connection_yield(sql, conn){conn.Execute(sql, 1)} 152 WIN32OLE::ARGV[1] 153 rescue ::WIN32OLERuntimeError => e 154 raise_error(e) 155 end 156 end 157 end
Just execute so it doesn't attempt to return the number of rows modified.
# File lib/sequel/adapters/ado.rb 139 def execute_insert(sql, opts=OPTS) 140 execute(sql, opts) 141 end
Sequel::Database#freeze
# File lib/sequel/adapters/ado.rb 128 def freeze 129 @conversion_procs.freeze 130 super 131 end
Private Instance Methods
Sequel::Database#adapter_initialize
# File lib/sequel/adapters/ado.rb 180 def adapter_initialize 181 case @opts[:conn_string] 182 when /Microsoft\.(Jet|ACE)\.OLEDB/io 183 require_relative 'ado/access' 184 extend Sequel::ADO::Access::DatabaseMethods 185 self.dataset_class = ADO::Access::Dataset 186 else 187 @opts[:driver] ||= 'SQL Server' 188 case @opts[:driver] 189 when 'SQL Server' 190 require_relative 'ado/mssql' 191 extend Sequel::ADO::MSSQL::DatabaseMethods 192 self.dataset_class = ADO::MSSQL::Dataset 193 set_mssql_unicode_strings 194 end 195 end 196 197 @conversion_procs = CONVERSION_PROCS.dup 198 199 super 200 end
The ADO
adapter's default provider doesn't support transactions, since it creates a new native connection for each query. So Sequel
only attempts to use transactions if an explicit :provider is given.
Sequel::Database#begin_transaction
# File lib/sequel/adapters/ado.rb 209 def begin_transaction(conn, opts=OPTS) 210 super if @opts[:provider] 211 end
Sequel::Database#commit_transaction
# File lib/sequel/adapters/ado.rb 213 def commit_transaction(conn, opts=OPTS) 214 super if @opts[:provider] 215 end
# File lib/sequel/adapters/ado.rb 217 def database_error_classes 218 [::WIN32OLERuntimeError] 219 end
# File lib/sequel/adapters/ado.rb 202 def dataset_class_default 203 Dataset 204 end
Sequel::Database#disconnect_error?
# File lib/sequel/adapters/ado.rb 221 def disconnect_error?(e, opts) 222 super || (e.is_a?(::WIN32OLERuntimeError) && e.message =~ /Communication link failure/) 223 end
Sequel::Database#rollback_transaction
# File lib/sequel/adapters/ado.rb 225 def rollback_transaction(conn, opts=OPTS) 226 super if @opts[:provider] 227 end