CodeIgniter 數據庫操作--連接

1、在application -> config --> database.php中配置數據庫

 

    這是默認的

 

$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();   //連接數據庫

$query = $this->db->query('select names,auther from books');  //查詢數據庫

        if ($query->num_rows() > 0)  //判斷是否有查詢結果
        {
            foreach($query->result() as $row) //取對象

             {

                    echo $row->names;

                    echo $row->auther;

              }

//或者

 

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

       }

 

//$this->db->reconnect();    //重新連接數據庫

$this->db->close();        //關閉數

 

 

其它一些函數

 

$query->row(); //取第一行數據返回一個對象

$query->row(5); //取第5 行返回一個對象

 

$query->row_array(); //取第一行數據成數組

$query->row_array(5); //取第五行返回一個數組