Class: DrbRelationBuilder

Inherits:
Object
  • Object
show all
Includes:
DRbUndumped, Eprint
Defined in:
lib/DrbDB/DrbRelationBuilder.rb

Overview

this file is part of manqod manqod is distributed under the CDDL licence the owner of manqod is Dobai-Pataky Balint([email protected])

Constant Summary

Constants included from Eprint

Eprint::TERM_COLOUR

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Eprint

#ecode, #edebug, #eerror, #eeval, #eexception, #efatal, #einfo, #eprint, #ewarn, #getBinding, #report_mail

Constructor Details

#initialize(drbdb, my_id) ⇒ DrbRelationBuilder

Returns a new instance of DrbRelationBuilder.



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# File 'lib/DrbDB/DrbRelationBuilder.rb', line 9

def initialize(drbdb,my_id)
  @my_id=my_id.to_i
  @drbdb=drbdb
  @title="Relation Builder"
  @relations=Hash.new
  @tables=Hash.new

end

Instance Attribute Details

#moditem ⇒ Object (readonly)

Returns the value of attribute moditem.



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# File 'lib/DrbDB/DrbRelationBuilder.rb', line 17

def moditem
  @moditem
end

Instance Method Details

#mod_type ⇒ Object 



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# File 'lib/DrbDB/DrbRelationBuilder.rb', line 121

def mod_type
  "relation_builder"
end

#to_s ⇒ Object 



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# File 'lib/DrbDB/DrbRelationBuilder.rb', line 125

def to_s
  "#{@drbdb}.RelationBuilder"
end

#update(table = nil, relation = nil) ⇒ Object 



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# File 'lib/DrbDB/DrbRelationBuilder.rb', line 19

def update(table=nil,relation=nil)
  #specify one table or one relation or nothing

  #clear related relations
  if table.nil? && relation.nil?
    @relations.clear
  else
    #reload table related relations
    @relations.delete_if{|key,val|
      val["src_table"] == table || val["dst_table"] == table
    } if table
    #reload specified relation
    @relations.delete(relation) if relation
  end
  #clear related tables
  if relation.nil?
    if table.nil?
      @tables.clear
    else
      @tables.delete_if{|key,val|
        val["name"] == table
      }
    end
  end
  
  #load table or talbes
  if relation.nil?
    @drbdb.rows("select * from tables " + (table ? "where name='#{table}'" : "") ).each{|row|
      @tables[row["name"]]={
        "id" => row["id"],
        "name" => row["name"],
        "rbx" => row["rbx"].to_f,
        "rby" => row["rby"].to_f
      }
      #indexes
      begin
        @tables[row["name"]]["indexes"]=Array.new
        @drbdb.client.rows("show indexes from #{row['name']}").each{|index|
          @tables[row["name"]]["indexes"].push({
            "name"=>index["Key_name"],
            "unique"=>index["Non_unique"]=="0", 
            "field"=>index["Column_name"]
          }
          )
        }
      rescue => err
        eerror(err)
      end

      #is view?
      is_view=false
      begin
        @drbdb.client.fields("show create table `#{row['name']}`").each{|f| is_view=true if f["name"].include?("View")}
        @tables[row["name"]]["view"]=is_view
      rescue => err
        eerror(err)
      end
      
      #fields
      @tables[row["name"]]["fields"]=Hash.new
      begin
        @drbdb.client.rows("show fields from #{row['name']}").each{|field|
          fi=field.rehash
          if f=field["Type"].index("(")
            fi["Size"]=field["Type"][f+1 .. field["Type"].index(")") -1]
            fi["Type"]=field["Type"][0 .. f-1]
          end
          @tables[row["name"]]["fields"][field["Field"]]=fi
        }
      rescue => err
        eerror(err)
      end

    }
  end
  
  #relations
  if table.nil?
    @drbdb.rows("select * from relations "  + (relation ? "where id='#{relation}'" : "") ).each{|row|
      @relations[row["id"]]={
        "id" => row["id"],
        "src_table" => row["src_table"],
        "src_field" => row["src_field"],
        "dst_table" => row["dst_table"],
        "dst_field" => row["dst_field"],
        "rel_name" => row['rel_name'],
        "rel_type" => row["rel_type"],
        "rbx" => row["rbx"].to_f,
        "rby" => row["rby"].to_f,
        "rel_custom" => row['rel_custom']
      }
    }
  end

  #store in the cache
  @drbdb.cache.set("tables",@tables)
  einfo("#{@tables.size} tables")
  @drbdb.cache.set("relations",@relations)
  einfo("#{@relations.size} relations")
  self
end