本文实例讲述了CodeIgniter针对数据库的连接、配置及使用方法。分享给大家供大家参考，具体如下：
1. 数据库：
create database test;create table users(id int not null,name varchar(10),pwd varchar(10),email varchar(20))insert into users values(1,'shunping','shunping','aa@163.com');insert into users values(2,'shunping2','shunping2','bb@163.com');
2. 我用的是Postgreql
在/CodeIgniter/system/application/config/database.php文件中配置数据库参数：
$active_group = "default";$db['default']['hostname'] = "localhost";$db['default']['username'] = "postgres";$db['default']['password'] = "admin";$db['default']['database'] = "test";$db['default']['dbdriver'] = "postgre";$db['default']['dbprefix'] = "";$db['default']['active_r'] = TRUE;$db['default']['pconnect'] = FALSE;$db['default']['db_debug'] = TRUE;$db['default']['cache_on'] = FALSE;$db['default']['cachedir'] = "";$db['default']['port'] = "5432";
在/CodeIgniter/system/application/controllers目录下测试文件db1.php内容如下：
<?phpclass Db1 extends Controller{ function index(){ $this->load->database(); $query=$this->db->query("select name,pwd,email from users"); foreach ($query->result() as $row) {//返回对象数组 echo $row->name; echo $row->pwd; echo $row->email."<br>"; } echo "Total Result==".$query->num_rows(); }}?> 打开浏览器敲入地址：
http://localhost:8888/index.php/MyController/db1
ok搞定！
我想大家肯定也遇到过连不上数据库的问题，我花费了好些精力才解决这个问题，现在告诉大家，希望对大家学习CodeIgniter这个优秀的PHP框架有所帮助。
