def columns(table_name, name = nil)
return [] if table_name.blank?
table_name = table_name.to_s if table_name.is_a?(Symbol)
table_name = table_name.split('.')[-1] unless table_name.nil?
sql = "SELECT COLUMN_NAME as ColName, COLUMN_DEFAULT as DefaultValue, DATA_TYPE as ColType, IS_NULLABLE As IsNullable, COL_LENGTH('#{table_name}', COLUMN_NAME) as Length, COLUMNPROPERTY(OBJECT_ID('#{table_name}'), COLUMN_NAME, 'IsIdentity') as IsIdentity, NUMERIC_SCALE as Scale FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '#{table_name}'"
result = log(sql, name) { @connection.select_all(sql) }
columns = []
result.each do |field|
default = field[:DefaultValue].to_s.gsub!(/[()\']/,"") =~ /null/ ? nil : field[:DefaultValue]
type = "#{field[:ColType]}(#{field[:Length]})"
is_identity = field[:IsIdentity] == 1
is_nullable = field[:IsNullable] == 'YES'
columns << ColumnWithIdentity.new(field[:ColName], default, type, is_identity, is_nullable, field[:Scale])
end
columns
end