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网站首页如何调用总的hits，就是每个内容页的阅读量总和
{php $ci->db->select_sum('hits');$row = $this->db->get('1_news')->row_array; echo $row['hits'];}
Type: Error
Message: Call to a member function get() on null
Filename: /www/wwwroot/cache/templates/templates.pc.default.home.right.html.cache.php
Line Number: 21
Backtrace:
File: /www/wwwroot/cache/templates/templates.pc.default.home.index.html.cache.phpLine: 45Function: include
File: /www/wwwroot/diy/dayrui/libraries/Template.phpLine: 234Function: include
File: /www/wwwroot/diy/branch/fqb/D_Common.phpLine: 3006Function: display
File: /www/wwwroot/diy/dayrui/controllers/Home.phpLine: 15Function: _indexc
File: /www/wwwroot/diy/Init.phpLine: 72Function: require
File: /www/wwwroot/index.phpLine: 49Function: require
{php $ci->db->select_sum('hits');$row = $ci->db->get('1_news')->row_array; echo $row['hits'];}
{php $ci->db->select_sum('hits');$row = $this->db->get('1_news')->row_array; echo $row['hits'];}随便写的，效率不高，需要优化一下An uncaught Exception was encountered
Type: Error
Message: Call to a member function get() on null
Filename: /www/wwwroot/cache/templates/templates.pc.default.home.right.html.cache.php
Line Number: 21
Backtrace:
File: /www/wwwroot/cache/templates/templates.pc.default.home.index.html.cache.php
Line: 45
Function: include
File: /www/wwwroot/diy/dayrui/libraries/Template.php
Line: 234
Function: include
File: /www/wwwroot/diy/branch/fqb/D_Common.php
Line: 3006
Function: display
File: /www/wwwroot/diy/dayrui/controllers/Home.php
Line: 15
Function: _indexc
File: /www/wwwroot/diy/Init.php
Line: 72
Function: require
File: /www/wwwroot/index.php
Line: 49
Function: require
{php $ci->db->select_sum('hits');$row = $ci->db->get('1_news')->row_array; echo $row['hits'];}数据不显示了。。