SQLSTATE[HY000]: General error: 5 Out of memory (Needed 1427928 bytes)

FILE: E:\beijinggreen\ThinkPHP\Library\Think\Db\Driver.class.php 　LINE: 169

#0 E:\beijinggreen\ThinkPHP\Library\Think\Db\Driver.class.php(169): PDOStatement->execute()
#1 E:\beijinggreen\ThinkPHP\Library\Think\Db\Driver.class.php(935): Think\Db\Driver->query('SELECT * FROM `...', false)
#2 E:\beijinggreen\ThinkPHP\Library\Think\Model.class.php(579): Think\Db\Driver->select(Array)
#3 E:\beijinggreen\Application\Home\Controller\DonationController.class.php(150): Think\Model->select()
#4 [internal function]: Home\Controller\DonationController->obligation()
#5 E:\beijinggreen\ThinkPHP\Library\Think\App.class.php(164): ReflectionMethod->invoke(Object(Home\Controller\DonationController))
#6 E:\beijinggreen\ThinkPHP\Library\Think\App.class.php(202): Think\App::exec()
#7 E:\beijinggreen\ThinkPHP\Library\Think\Think.class.php(120): Think\App::run()
#8 E:\beijinggreen\ThinkPHP\ThinkPHP.php(97): Think\Think::start()
#9 E:\beijinggreen\index.php(24): require('E:\\beijinggreen...')
#10 {main}