diff --git a/app/models/cdao/base.rb b/app/models/cdao/base.rb
new file mode 100644
index 0000000..bfa859b
--- /dev/null
+++ b/app/models/cdao/base.rb
@@ -0,0 +1,9 @@
+class Cdao::Base < ActiveRecord::Base
+  self.abstract_class = true
+
+  establish_connection Cdao::DatabaseConnector.database_config
+
+  def self.table_name_prefix
+    "cdao_"
+  end
+end
diff --git a/app/models/cdao/database_connector.rb b/app/models/cdao/database_connector.rb
new file mode 100644
index 0000000..5b60dbf
--- /dev/null
+++ b/app/models/cdao/database_connector.rb
@@ -0,0 +1,30 @@
+module Cdao
+  module DatabaseConnector
+    class << self
+      attr_writer :config, :config_path
+
+      def database_config
+        config["database"]
+      end
+
+      def config
+        @config ||=
+          if File.exist?(config_path)
+            File.open(config_path) do |file|
+              YAML.safe_load(ERB.new(file.read).result)[::Rails.env]
+            end
+          else
+            {}
+          end
+      end
+
+      def config_path
+        @config_path ||= File.join(::Rails.root, "config", "database.cdao.yml")
+      end
+
+      def reset
+        @config = nil
+      end
+    end
+  end
+end
diff --git a/app/models/cdao/jurisprudence.rb b/app/models/cdao/jurisprudence.rb
new file mode 100644
index 0000000..590f770
--- /dev/null
+++ b/app/models/cdao/jurisprudence.rb
@@ -0,0 +1,3 @@
+class Cdao::Jurisprudence < Cdao::Base
+  self.table_name = "jurisprudences"
+end
diff --git a/app/models/cdao/library.rb b/app/models/cdao/library.rb
new file mode 100644
index 0000000..d1a4b2e
--- /dev/null
+++ b/app/models/cdao/library.rb
@@ -0,0 +1,5 @@
+class Cdao::Library < Cdao::Base
+  default_scope { where(id: Cdao::Library.find_by(key: "JurisprudenceEncyclopedia").try(:id)) }
+
+  self.table_name = "producttitles"
+end
diff --git a/app/models/cdao/library_subject.rb b/app/models/cdao/library_subject.rb
new file mode 100644
index 0000000..3cd63b8
--- /dev/null
+++ b/app/models/cdao/library_subject.rb
@@ -0,0 +1,28 @@
+class Cdao::LibrarySubject < Cdao::Base
+  acts_as_list column: :rank, scope: %i[library_id subject_parent_id]
+
+  belongs_to :library, optional: false
+  delegate :name, :rank, to: :library, prefix: true
+
+  belongs_to :subject, optional: false
+
+  validates :library_id, uniqueness: { scope: %i[subject_id] }
+
+  after_save do
+    update_column :subject_parent_id, subject.parent_id # rubocop:disable Rails/SkipsModelValidations
+  end
+
+  def self.import
+    Subject.find_each do |subject|
+      subject.library_subjects.where(library_id: subject.library_id).first_or_create
+    end
+  end
+
+  def self.import_rank_from_subjects
+    Subject.find_each do |subject|
+      subject.library_subjects.each do |subject_library|
+        subject_library.update(rank: subject.rank)
+      end
+    end
+  end
+end
diff --git a/app/models/cdao/subject.rb b/app/models/cdao/subject.rb
new file mode 100644
index 0000000..b739703
--- /dev/null
+++ b/app/models/cdao/subject.rb
@@ -0,0 +1,47 @@
+class Cdao::Subject < Cdao::Base
+  default_scope { joins(:library_subjects)
+                  .where(cdao_library_subjects: { library_id: [Cdao::Library.find_by(key: "JurisprudenceEncyclopedia").try(:id)] }) }
+
+  has_ancestry
+
+  has_many :library_subjects, dependent: :restrict_with_error
+  accepts_nested_attributes_for :library_subjects, allow_destroy: true
+
+  has_many :libraries, through: :library_subjects
+  alias_attribute :producttitles, :libraries
+
+  validates :name, presence: true
+  validates :name, uniqueness: { scope: %i[ancestry] }
+
+  scope :byproduct, lambda { |id|
+    joins(:library_subjects).where(library_subjects: { library_id:  id })
+  }
+  scope :for_lib, lambda { |*ids|
+    product_key = ids.shift
+    where(arel_table[:id].in(ids).or(arel_table[:library_id].eq(product_key)))
+  }
+
+  scope :with_parent, -> { where(arel_table[:ancestry].not_eq nil) }
+
+  state_machine initial: :published do
+    event :publish do
+      transition from: :activated, to: :published
+    end
+
+    event :unpublish do
+      transition from: :published, to: :activated
+    end
+  end
+
+  def lineage_name
+    path.map(&:name).join("; ")
+  end
+
+  def name_with_product_names
+    product_names = libraries.map(&:name).reject(&:blank?).join(", ")
+
+    return name if product_names.blank?
+
+    [name, "(#{product_names})"].join(" ")
+  end
+end
diff --git a/config/database.cdao.yml b/config/database.cdao.yml
new file mode 100644
index 0000000..764daea
--- /dev/null
+++ b/config/database.cdao.yml
@@ -0,0 +1,25 @@
+development:
+  database: 
+    adapter: <%= ENV["DB_ADAPTER"] || "postgresql" %>
+    url: <%= ENV["DATABASE_URL_CDAO"] %>
+    pool: <%= ENV["DB_POOL"] || ENV['MAX_THREADS'] || 5 %>
+    prepared_statements: false
+    advisory_locks: false
+    variables:
+      statement_timeout: 10s
+
+test:
+  database: 
+    adapter: <%= ENV["DB_ADAPTER"] || "postgresql" %>
+    url: <%= ENV["DATABASE_URL_CDAO"] %>
+    pool: <%= ENV["DB_POOL"] || ENV['MAX_THREADS'] || 5 %>
+
+production:
+  database: 
+    adapter: <%= ENV["DB_ADAPTER"] || "postgresql" %>
+    url: <%= ENV["DATABASE_URL_CDAO"] %>
+    pool: <%= ENV["DB_POOL"] || ENV['MAX_THREADS'] || 5 %>
+    prepared_statements: false
+    advisory_locks: false
+    variables:
+      statement_timeout: 10s