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The examples in this article describe common functions for CI framework AR database operations. Share it with everyone for your reference, the details are as follows:
1. Query table records
$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. Add table records
$this->db->insert();
3. Change table records
$this->db->set(); $this->db->update();
4. Delete table records
$this->db->delete();
5. Clear table records
$this->db->empty_table(); $this->db->truncate();
6. Cache part
$this->db->start_cache() $this->db->stop_cache() $this->db->flush_cache()
7. Result set
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. Auxiliary query function
$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
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