Class: MysqlBuilder

Inherits:
QueryBuilder show all
Defined in:
lib/mdlsql/sockets/mysql.rb

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from QueryBuilder

#insert, #select, #update

Constructor Details

#initialize ⇒ MysqlBuilder

Returns a new instance of MysqlBuilder.



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# File 'lib/mdlsql/sockets/mysql.rb', line 25

def initialize
end

Class Method Details

.insert(values = {}) ⇒ Object 



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# File 'lib/mdlsql/sockets/mysql.rb', line 88

def insert(values={})
	# INSERT INTO table (column1, column2) VALUES (v1c1, v1c2), (v2c1, v2c2)
	cols = values[:cols]
	tables = values[:tables]
	where = values[:where]
	vals = values[:values]

	query = String.new
	query = 'INSERT INTO'

	if tables
		tables.each do |tab|
			query << ' ' << tab.name.to_s << ','
			# query << " #{tab.name}"
			# query << " AS #{tab.as}" if tab.as
		end
		query.chop!

	else
		raise "No tables at insert query."
	end

	if cols && cols.count > 0
		query << ' ('
		cols.each do |key,col|
			query << "#{col},"
		end

		query.chop! << ')'
	end

	query << ' VALUES'

	if vals
		vals.each do |row|
			query << ' ('
			row.each do |val|
				query << "'#{val}'" << ','
			end
			query.chop!
			query << '),'
		end
		query.chop!
	else
		raise 'No values to insert.'
	end

	return query
end

.select(values = {}) ⇒ Object 



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# File 'lib/mdlsql/sockets/mysql.rb', line 29

def select(values={})
	cols = values[:cols]
	tables = values[:tables]
	where = values[:where]
	join = values[:join]

	query = String.new
	query = "SELECT"

	# Columns (with alias)
	if cols	
		cols.each do |key,value|
			query << " #{key} AS #{value}" << ','
		end
		query.chop!
	else
		query << " *"
	end
	
	# From (with possible alias)
	if tables
		query << "\nFROM"
		tables.each do |tab|
			query << ' ' << tab.to_mysql << ','
			# query << " #{tab.name}"
			# query << " AS #{tab.as}" if tab.as
		end
		query.chop!

	else
		raise "No table at select query."
	end
	
	# @join, see Join
	if join && join.length > 0
		join.each do |j|
			query << j.to_mysql
			# query << ' ' << value[:type] if value[:type]
			# query << ' ' << value[:table].to_s
			# query << " ON #{value[:cond1]} #{value[:op]} #{value[:cond2]}"
		end
	end
	# @where = Array
	if where && where.length > 0
		query << "\nWHERE"
		# where.each do |dec|
		# 	query << " #{dec}"
		# end
		first = true
		where.each do |wh|
			query << " #{wh.concat}" unless first
			query << " #{wh.cond1} #{wh.op} #{wh.cond2}"
			first = false
		end
	end

	return query
end

.update(values = {}) ⇒ Object 



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# File 'lib/mdlsql/sockets/mysql.rb', line 138

def update(values={})
	# UPDATE example SET age='22' WHERE age='21'

	tables = values[:tables]
	set = values[:values]
	where = values[:where]

	query = String.new()

	if tables
		query << "UPDATE"
		tables.each do |tab|
			query << ' ' << tab.to_mysql << ','
			# query << " #{tab.name}"
			# query << " AS #{tab.as}" if tab.as
		end
		query.chop!

	else
		raise "No table at update query."
	end

	query << "\nSET"

	if set && set.count > 0
		set.each do |key, value|
			query << " #{key} = '#{value}',"
		end
		query.chop!
	else
		raise 'Nothing to be set.'
	end

	if where && where.length > 0
		query << "\nWHERE"
		# where.each do |dec|
		# 	query << " #{dec}"
		# end
		first = true
		where.each do |wh|
			query << " #{wh.concat}" unless first
			query << " #{wh.cond1} #{wh.op} #{wh.cond2}"
			first = false
		end
	end

	return query
end