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