[Rails3] Sync abstract adapter directory structure - DatabaseLimits

Author: metaskills

activerecord-sqlserver-adapter.gemspec

@@ -21,7 +21,8 @@ Gem::Specification.new do |s|
     "lib/activerecord-sqlserver-adapter.rb",
     "lib/active_record/connection_adapters/sqlserver_adapter.rb",
     "lib/active_record/connection_adapters/sqlserver_adapter/core_ext/active_record.rb",
-    "lib/active_record/connection_adapters/sqlserver_adapter/core_ext/odbc.rb" ]
+    "lib/active_record/connection_adapters/sqlserver_adapter/core_ext/odbc.rb",
+    "lib/active_record/connection_adapters/sqlserver_adapter/database_limits.rb" ]
   s.test_files = [
     "test/cases/aaaa_create_tables_test_sqlserver.rb",
     "test/cases/adapter_test_sqlserver.rb",

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -1,6 +1,8 @@
 require 'active_record'
 require 'active_record/connection_adapters/abstract_adapter'
 require 'active_record/connection_adapters/sqlserver_adapter/core_ext/active_record'
+require 'active_record/connection_adapters/sqlserver_adapter/database_limits'
+require 'active_support/core_ext/kernel/requires'
 require 'base64'
 
 module ActiveRecord
@@ -13,7 +15,6 @@ def self.sqlserver_connection(config) #:nodoc:
       mode = config[:mode].to_s.downcase.underscore.to_sym
       case mode
       when :odbc
-        require 'active_support/core_ext/kernel/requires'
         require_library_or_gem 'odbc' unless defined?(ODBC)
         require 'active_record/connection_adapters/sqlserver_adapter/core_ext/odbc'
         raise ArgumentError, 'Missing :dsn configuration.' unless config.has_key?(:dsn)
@@ -159,17 +160,10 @@ def simplified_datetime
 
     end #SQLServerColumn
 
-    # In ODBC mode, the adapter requires Ruby ODBC and requires that you specify 
-    # a :dsn option. Ruby ODBC is available at http://www.ch-werner.de/rubyodbc/
-    #
-    # Options:
-    #
-    # * <tt>:username</tt>      -- Defaults to sa.
-    # * <tt>:password</tt>      -- Defaults to blank string.
-    # * <tt>:dsn</tt>           -- An ODBC DSN. (required)
-    # 
     class SQLServerAdapter < AbstractAdapter
 
+      include SqlserverAdapter::DatabaseLimits
+      
       ADAPTER_NAME                = 'SQLServer'.freeze
       VERSION                     = '3.0.0.beta1'.freeze
       DATABASE_VERSION_REGEXP     = /Microsoft SQL Server\s+(\d{4})/
@@ -568,10 +562,6 @@ def native_database_types
         }
       end
 
-      def table_alias_length
-        128
-      end
-      
       def tables(name = nil)
         info_schema_query do
           select_values "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_NAME <> 'dtproperties'"

lib/active_record/connection_adapters/sqlserver_adapter/database_limits.rb

@@ -0,0 +1,49 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module SqlserverAdapter
+      module DatabaseLimits
+        
+        def table_alias_length
+          128
+        end
+
+        def column_name_length
+          128
+        end
+
+        def table_name_length
+          128
+        end
+
+        def index_name_length
+          128
+        end
+
+        def columns_per_table
+          1024
+        end
+
+        def indexes_per_table
+          sqlserver_2000? ? 249 : 999
+        end
+
+        def columns_per_multicolumn_index
+          16
+        end
+
+        def in_clause_length
+          65536
+        end
+
+        def sql_query_length
+          65536 * 4096
+        end
+
+        def joins_per_query
+          256
+        end
+        
+      end
+    end
+  end
+end