Class: DbAgile::SequelAdapter::Schema::PhysicalDump

Inherits:
Object
  • Object
show all
Defined in:
lib/dbagile/adapter/sequel/schema/physical_dump.rb

Overview

Loads a schema from an existing database through Sequel

Instance Method Summary collapse

Instance Method Details

#dbtype_to_ruby_type(info) ⇒ Object

Returns the ruby type associated to a given column info



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 10

def dbtype_to_ruby_type(info)
  type = info[:type]
  capitalized = type.to_s.capitalize
  begin
    Kernel.eval(capitalized)
  rescue NameError
    case type
      when :datetime
        Time
      when :boolean
        SByC::TypeSystem::Ruby::Boolean
      else
        Object
    end
  end
end

#load_logical_schema(conn, builder) ⇒ Object 



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 37

def load_logical_schema(conn, builder)
  conn.tables.each{|table|
    load_table_schema(conn, builder, table)
  }
end

#load_physical_schema(conn, builder) ⇒ Object

Loads the physical schema



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 92

def load_physical_schema(conn, builder)
  builder.indexes{
    conn.tables.each{|table|
      conn.indexes(table).each_pair{|name, defn|
        next if defn[:unique]
        builder.index(name, {:relvar => table, :attributes => defn[:columns]})
      }
    }
  }
end

#load_table_constraints(conn, builder, table, primary_key_columns = nil) ⇒ Object

Loads table constraint



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 79

def load_table_constraints(conn, builder, table, primary_key_columns = nil)
  builder.constraints{
    unless primary_key_columns.nil? or primary_key_columns.empty?
      builder.constraint(:pk, {:type => :primary_key, :attributes => primary_key_columns})
    end
    conn.indexes(table).each_pair{|name, defn|
      next unless defn[:unique]
      builder.constraint(name, {:type => :candidate_key, :attributes => defn[:columns]})
    }
  }
end

#load_table_heading(conn, builder, table) ⇒ Object

Loads a table heading. Returns primary key columns



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 52

def load_table_heading(conn, builder, table)
  primary_key_columns = []
  builder.heading{
    columns = conn.schema(table, {:reload => true})
    columns.each do |name, info|
      #puts info.inspect
      
      # find attribute definition
      defn = {:domain    => dbtype_to_ruby_type(info),
              :mandatory => !info[:allow_null] }
      unless info[:ruby_default].nil?
        defn[:default] = info[:ruby_default]
      end
      
      # mark primary key columns
      if primary_key_columns and info[:primary_key]
        primary_key_columns << name 
      end
      
      # build the attribute
      builder.attribute(name, defn)
    end
  }
  primary_key_columns
end

#load_table_schema(conn, builder, table) ⇒ Object

Loads a table schema



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 44

def load_table_schema(conn, builder, table)
  builder.relvar(table){
    primary_key_columns = load_table_heading(conn, builder, table)
    load_table_constraints(conn, builder, table, primary_key_columns)
  }
end

#run(conn, identifier) ⇒ Object

Runs the loading process and returns the schema instance



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# File 'lib/dbagile/adapter/sequel/schema/physical_dump.rb', line 28

def run(conn, identifier)
  builder = DbAgile::Core::Schema::builder
  builder.schema(identifier){
    builder.logical{ load_logical_schema(conn, builder) }
    builder.physical{ load_physical_schema(conn, builder) }
  }
  builder._dump
end