CodeIgniter 数据库操作--连接

1、在application -> config --> database.php中配置数据库

 

    这是默认的

 

$active_group = 'default'; $active_record = TRUE; $db['default']['hostname'] = 'localhost'; $db['default']['username'] = 'root'; $db['default']['password'] = ''; $db['default']['database'] = 'mlshome'; $db['default']['dbdriver'] = 'mysql'; $db['default']['dbprefix'] = ''; $db['default']['pconnect'] = TRUE; $db['default']['db_debug'] = TRUE; $db['default']['cache_on'] = FALSE; $db['default']['cachedir'] = ''; $db['default']['char_set'] = 'utf8'; $db['default']['dbcollat'] = 'utf8_general_ci'; $db['default']['swap_pre'] = ''; $db['default']['autoinit'] = TRUE; $db['default']['stricton'] = FALSE;

 

$this->load->database();   //连接数据库 $query = $this->db->query('select names,auther from books');  //查询数据库

        if ($query->num_rows() > 0)  //判断是否有查询结果         {             foreach($query->result() as $row) //取对象

             {

                    echo $row->names;

                    echo $row->auther;

              }

//或者

 

foreach ($query->result_array() as $row)  //取组 {    echo $row['title'];    echo $row['name'];    echo $row['body']; }

       }

 

//$this->db->reconnect();    //重新连接数据库 $this->db->close();        //关闭数

 

 

其它一些函数

 

$query->row(); //取第一行数据返回一个对象

$query->row(5); //取第5 行返回一个对象

 

$query->row_array(); //取第一行数据成数组

$query->row_array(5); //取第五行返回一个数组