本文实例讲述了CI框架AR数据库操作常用函数。分享给大家供大家参考，具体如下：
1、查询表记录
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$this->db->select(); //选择查询的字段$this->db->select_max();$this->db->select_min();$this->db->select_avg();$this->db->select_sum();$this->db->from(); //选择表名$this->db->join();$this->db->get(); //得到查询结果$this->db->get_where();$this->db->where();$this->db->or_where();$this->db->where_in();$this->db->or_where_in();$this->db->where_not_in();$this->db->or_where_not_in();$this->db->like();$this->db->or_like();$this->db->not_like();$this->db->or_not_like();$this->db->group_by();$this->db->distinct();$this->db->having();$this->db->or_having();$this->db->order_by();$this->db->limit();$this->db->count_all_results(); |
2、增加表记录
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$this->db->insert(); |
3、更改表记录
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$this->db->set();$this->db->update(); |
4、删除表记录
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$this->db->delete(); |
5、清空表记录
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$this->db->empty_table();$this->db->truncate(); |
6、缓存部分
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$this->db->start_cache()$this->db->stop_cache()$this->db->flush_cache() |
7、结果结果集
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result() //返回对象数组result_array() //返回二维数组row() //返回一个对象row_array() //返回一维数组num_rows() //返回查询的行数num_fields() //返回查询结果的字段数free_result() //释放查询所占的资源内存 |
8、辅助查询函数
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$this->db->insert_id() //获取刚刚插入的id$this->db->affected_rows() //修改或插入影响的行数$this->db->count_all(); //统计记录的总条数 这一函数加入where条件无效$this->db->last_query(); //最后一条执行的sql语句//注意以下两个函数仅返回sql语句 不执行sql语句$data = array('name' => $name, 'email' => $email, 'url' => $url);$str = $this->db->insert_string('table_name', $data);$data = array('name' => $name, 'email' => $email, 'url' => $url);$where = "author_id = 1 AND status = 'active'";$str = $this->db->update_string('table_name', $data, $where); //返回正确格式的更新字符串 |
希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。
