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 this ADO 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, line 105 def connect(server) opts = server_opts(server) s = opts[:conn_string] || "driver=#{opts[:driver]};server=#{opts[:host]};database=#{opts[:database]}#{";uid=#{opts[:user]};pwd=#{opts[:password]}" if opts[:user]}" handle = WIN32OLE.new('ADODB.Connection') handle.CommandTimeout = opts[:command_timeout] if opts[:command_timeout] handle.Provider = opts[:provider] if opts[:provider] handle.Open(s) handle end
# File lib/sequel/adapters/ado.rb, line 115 def disconnect_connection(conn) conn.Close rescue WIN32OLERuntimeError nil end
# File lib/sequel/adapters/ado.rb, line 152 def execute(sql, opts=OPTS) synchronize(opts[:server]) do |conn| begin r = log_connection_yield(sql, conn){conn.Execute(sql)} begin yield r if block_given? ensure begin r.close rescue ::WIN32OLERuntimeError end end rescue ::WIN32OLERuntimeError => e raise_error(e) end end nil end
Just execute so it doesn't attempt to return the number of rows modified.
# File lib/sequel/adapters/ado.rb, line 127 def execute_ddl(sql, opts=OPTS) execute(sql, opts) 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).
# File lib/sequel/adapters/ado.rb, line 140 def execute_dui(sql, opts=OPTS) return super if opts[:provider] synchronize(opts[:server]) do |conn| begin log_connection_yield(sql, conn){conn.Execute(sql, 1)} WIN32OLE::ARGV[1] rescue ::WIN32OLERuntimeError => e raise_error(e) end end end
Just execute so it doesn't attempt to return the number of rows modified.
# File lib/sequel/adapters/ado.rb, line 132 def execute_insert(sql, opts=OPTS) execute(sql, opts) end
# File lib/sequel/adapters/ado.rb, line 121 def freeze @conversion_procs.freeze super end
Private Instance Methods
# File lib/sequel/adapters/ado.rb, line 173 def adapter_initialize case @opts[:conn_string] when /Microsoft\.(Jet|ACE)\.OLEDB/io require_relative 'ado/access' extend Sequel::ADO::Access::DatabaseMethods self.dataset_class = ADO::Access::Dataset else @opts[:driver] ||= 'SQL Server' case @opts[:driver] when 'SQL Server' require_relative 'ado/mssql' extend Sequel::ADO::MSSQL::DatabaseMethods self.dataset_class = ADO::MSSQL::Dataset set_mssql_unicode_strings end end @conversion_procs = CONVERSION_PROCS.dup super 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.
# File lib/sequel/adapters/ado.rb, line 202 def begin_transaction(conn, opts=OPTS) super if @opts[:provider] end
# File lib/sequel/adapters/ado.rb, line 206 def commit_transaction(conn, opts=OPTS) super if @opts[:provider] end
# File lib/sequel/adapters/ado.rb, line 210 def database_error_classes [::WIN32OLERuntimeError] end
# File lib/sequel/adapters/ado.rb, line 195 def dataset_class_default Dataset end
# File lib/sequel/adapters/ado.rb, line 214 def disconnect_error?(e, opts) super || (e.is_a?(::WIN32OLERuntimeError) && e.message =~ /Communication link failure/) end
# File lib/sequel/adapters/ado.rb, line 218 def rollback_transaction(conn, opts=OPTS) super if @opts[:provider] end