```ruby
Sequel.require 'adapters/shared/mssql'

module Sequel
  module JDBC
    # Database and Dataset instance methods for MSSQL specific
    # support via JDBC.
    module MSSQL
      # Database instance methods for MSSQL databases accessed via JDBC.
      module DatabaseMethods
        include Sequel::MSSQL::DatabaseMethods
        
        # Return instance of Sequel::JDBC::MSSQL::Dataset with the given opts.
        def dataset(opts=nil)
          Sequel::JDBC::MSSQL::Dataset.new(self, opts)
        end
        
        private
        
        # Get the last inserted id using SCOPE_IDENTITY().
        def last_insert_id(conn, opts={})
          stmt = conn.createStatement
          begin
            sql = opts[:prepared] ? 'SELECT @@IDENTITY' : 'SELECT SCOPE_IDENTITY()'
            log_info(sql)
            rs = stmt.executeQuery(sql)
            rs.next
            rs.getInt(1)
          ensure
            stmt.close
          end
        end
      end
      
      # Dataset class for MSSQL datasets accessed via JDBC.
      class Dataset < JDBC::Dataset
        include Sequel::MSSQL::DatasetMethods
      end
    end
  end
end
```

Use generic JDBC schema parsing in MSSQL subadapter, since it handles primary keys
user
```ruby
Sequel.require 'adapters/shared/mssql'

module Sequel
  module JDBC
    class Database
      # Alias the generic JDBC version so it can be called directly later
      alias jdbc_schema_parse_table schema_parse_table
    end
    
    # Database and Dataset instance methods for MSSQL specific
    # support via JDBC.
    module MSSQL
      # Database instance methods for MSSQL databases accessed via JDBC.
      module DatabaseMethods
        include Sequel::MSSQL::DatabaseMethods
        
        # Return instance of Sequel::JDBC::MSSQL::Dataset with the given opts.
        def dataset(opts=nil)
          Sequel::JDBC::MSSQL::Dataset.new(self, opts)
        end
        
        private
        
        # Get the last inserted id using SCOPE_IDENTITY().
        def last_insert_id(conn, opts={})
          stmt = conn.createStatement
          begin
            sql = opts[:prepared] ? 'SELECT @@IDENTITY' : 'SELECT SCOPE_IDENTITY()'
            log_info(sql)
            rs = stmt.executeQuery(sql)
            rs.next
            rs.getInt(1)
          ensure
            stmt.close
          end
        end
        
        # Call the generic JDBC version instead of MSSQL version,
        # since the JDBC version handles primary keys.
        def schema_parse_table(table, opts={})
          jdbc_schema_parse_table(table, opts)
        end
      end
      
      # Dataset class for MSSQL datasets accessed via JDBC.
      class Dataset < JDBC::Dataset
        include Sequel::MSSQL::DatasetMethods
      end
    end
  end
end
```
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