系统发生错误

:(

1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'and deleted_at is null ) LIMIT 1' at line 1 [ SQL语句 ] : SELECT `content` FROM `bjl_page` WHERE ( nav_id= and deleted_at is null ) LIMIT 1

错误位置

FILE: C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Db\Driver.class.php  LINE: 350

TRACE

#0 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Db\Driver.class.php(350): E('1064:You have a...')
#1 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Db\Driver.class.php(180): Think\Db\Driver->error()
#2 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Db\Driver.class.php(946): Think\Db\Driver->query('SELECT `content...', false)
#3 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Model.class.php(970): Think\Db\Driver->select(Array)
#4 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\Application\Home\Controller\PageController.class.php(26): Think\Model->getField('content')
#5 [internal function]: Home\Controller\PageController->index()
#6 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\App.class.php(173): ReflectionMethod->invoke(Object(Home\Controller\PageController))
#7 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\App.class.php(110): Think\App::invokeAction(Object(Home\Controller\PageController), 'index')
#8 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\App.class.php(204): Think\App::exec()
#9 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\Library\Think\Think.class.php(120): Think\App::run()
#10 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\ThinkPHP\ThinkPHP.php(98): Think\Think::start()
#11 C:\HwsHostMaster\wwwroot\baijule_eev24g\web\index.php(16): require('C:\\HwsHostMaste...')
#12 {main}