Class: Og::MysqlAdapter

Inherits:
Adapter show all
Defined in:
lib/og/adapters/mysql.rb

Overview

The MySQL adapter. This adapter communicates with an MySQL rdbms. For extra documentation see lib/og/adapter.rb

Instance Attribute Summary

Attributes inherited from Adapter

#typemap

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Adapter

#create_fields, encode, #eval_og_insert, #eval_og_read, #eval_og_update, for_name, join_table, parse_date, parse_timestamp, #props_for_insert, table

Constructor Details

#initialize ⇒ MysqlAdapter

Returns a new instance of MysqlAdapter.



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# File 'lib/og/adapters/mysql.rb', line 19

def initialize
	super
	@typemap.update({TrueClass => 'tinyint'})
end

Class Method Details

.date(date) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 34

def self.date(date)
	return nil unless date
	return "#{date.year}-#{date.month}-#{date.mday}" 
end

.escape(str) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 24

def self.escape(str)
	return nil unless str
	return Mysql.quote(str)
end

.timestamp(time = Time.now) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 29

def self.timestamp(time = Time.now)
	return nil unless time
	return time.strftime("%Y%m%d%H%M%S")
end

Instance Method Details

#calc_field_index(klass, db) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 104

def calc_field_index(klass, db)
	res = db.query "SELECT * FROM #{klass::DBTABLE} LIMIT 1"
	meta = db.managed_classes[klass]

	for idx in (0...res.num_fields)
		meta.field_index[res.fetch_field.name] = idx
	end

ensure
	res.free if res
end

#create_db(database, user = nil, password = nil) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 75

def create_db(database, user = nil, password = nil)
	`mysqladmin -f --user=#{user} --password=#{password} create #{database}`
	super
end

#create_table(klass, db) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 116

def create_table(klass, db)
	conn = db.get_connection

	fields = create_fields(klass)

	sql = "CREATE TABLE #{klass::DBTABLE} (#{fields.join(', ')}"
	
	conn.store.query_with_result = true 

	# Create table constrains
	
	if klass.__meta and constrains = klass.__meta[:sql_constrain]
		sql << ", #{constrains.join(', ')}"
	end
	
	sql << ');'
	
	begin
		conn.store.query(sql)
		Logger.info "Created table '#{klass::DBTABLE}'."
	rescue => ex
		if ex.errno == 1050 # table already exists.
			Logger.debug "Table already exists" if $DBG
			return 
		else
			raise
		end
	end
	
	# Create indices
	
	if klass.__meta and indices = klass.__meta[:sql_index] 
		for data in indices
			idx, options = *data
			idx = idx.to_s
			pre_sql, post_sql = options[:pre], options[:post]
			idxname = idx.gsub(/ /, "").gsub(/,/, "_").gsub(/\(.*\)/, "")
			conn.store.query("CREATE #{pre_sql} INDEX #{klass::DBTABLE}_#{idxname}_idx #{post_sql} ON #{klass::DBTABLE} (#{idx})")
		end
	end

	# Create join tables if needed. Join tables are used in
	# 'many_to_many' relations.
	
	if klass.__meta and joins = klass.__meta[:sql_join] 
		for data in joins
			# the class to join to and some options.
			join_class, options = *data
			
			# gmosx: dont use DBTABLE here, perhaps the join class
			# is not managed yet.
			join_table = "#{self.class.join_table(klass, join_class)}"
			join_src = "#{self.class.encode(klass)}_oid"
			join_dst = "#{self.class.encode(join_class)}_oid"
			begin
				conn.store.query("CREATE TABLE #{join_table} ( key1 integer NOT NULL, key2 integer NOT NULL )")
				conn.store.query("CREATE INDEX #{join_table}_key1_idx ON #{join_table} (key1)")
				conn.store.query("CREATE INDEX #{join_table}_key2_idx ON #{join_table} (key2)")
			rescue => ex
				if ex.errno == 1050 # table already exists.
					Logger.debug "Join table already exists" if $DBG
				else
					raise
				end
			end
		end
	end		
	
ensure
	db.put_connection
end

#drop_db(database, user = nil, password = nil) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 80

def drop_db(database, user = nil, password = nil)
	`mysqladmin -f --user=#{user} --password=#{password} drop #{database}`
	super
end

#eval_og_oid(klass) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 188

def eval_og_oid(klass)
	klass.class_eval %{
		prop_accessor :oid, Fixnum, :sql => 'integer AUTO_INCREMENT PRIMARY KEY'
	}
end

#insert_code(klass, db, pre_cb, post_cb) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 85

def insert_code(klass, db, pre_cb, post_cb)
	props = props_for_insert(klass)
	values = props.collect { |p| write_prop(p) }.join(',') 
	
	sql = "INSERT INTO #{klass::DBTABLE} (#{props.collect {|p| p.name}.join(',')}) VALUES (#{values})"

	%{
		#{pre_cb}
		conn.store.query_with_result = false
		conn.store.query "#{sql}"
		@oid = conn.store.insert_id()
		#{post_cb}
	}
end

#new_connection(db) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 100

def new_connection(db)
	return Og::MysqlConnection.new(db)
end

#read_prop(p, idx) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 57

def read_prop(p, idx)
	if p.klass.ancestors.include?(Integer)
		return "res[#{idx}].to_i"
	elsif p.klass.ancestors.include?(Float)
		return "res[#{idx}].to_f"
	elsif p.klass.ancestors.include?(String)
		return "res[#{idx}]"
	elsif p.klass.ancestors.include?(Time)
		return "#{self.class}.parse_timestamp(res[#{idx}])"
	elsif p.klass.ancestors.include?(Date)
		return "#{self.class}.parse_date(res[#{idx}])"
	elsif p.klass.ancestors.include?(TrueClass)
		return "('0' != res[#{idx}])"
	else 
		return "YAML::load(res[#{idx}])"
	end				
end

#write_prop(p) ⇒ Object 



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# File 'lib/og/adapters/mysql.rb', line 39

def write_prop(p)
	if p.klass.ancestors.include?(Integer)
		return "#\{@#{p.symbol} || 'NULL'\}"
	elsif p.klass.ancestors.include?(Float)
		return "#\{@#{p.symbol} || 'NULL'\}"		
	elsif p.klass.ancestors.include?(String)
		return "'#\{#{self.class}.escape(@#{p.symbol})\}'"
	elsif p.klass.ancestors.include?(Time)
		return %|#\{@#{p.symbol} ? "'#\{#{self.class}.timestamp(@#{p.symbol})\}'" : 'NULL'\}|
	elsif p.klass.ancestors.include?(Date)
		return %|#\{@#{p.symbol} ? "'#\{#{self.class}.date(@#{p.symbol})\}'" : 'NULL'\}|
	elsif p.klass.ancestors.include?(TrueClass)
		return "#\{@#{p.symbol} ? 1 : 0 \}"
	else 
		return %|#\{@#{p.symbol} ? "'#\{#{self.class}.escape(@#{p.symbol}.to_yaml)\}'" : "''"\}|
	end
end