------- $this->load->database();//手动连接数据库 //连接多数据库 $db1 = $this->load->database('group_one', true); $db2 = $this->load->database('group_two', true); 查询
------- //参数绑定形式 $sql = select * from some_table where id = ? and status = ? and author = ?; $this->db->query($sql, array(3, 'live', 'rick')); //多结果标准查询 $query = $this->db->query($sql); //自定义 $query = $this->db->get('tablename'); //便捷形式，相当于:select * from tablename $query = $this->db->get('tablename', 10, 20); // 相当于: select * from tablename limit 20, 10 $query->result() //对象形式 $query->result_array() //数组形式 $query->num_rows() //总条数 $query->num_fields() //字段数 //单结果标准查询 $row = $query->row(); //对象形式 $row = $query->row_array(); //数组形式 插入 ------- $data = array( 'title' => $title, 'name' => $name ); $this->db->insert('tablename', $data); //便捷插入 $this->db->insert_string('tablename', $data); //便捷插入 $this->db->insert_id() //刚插入的id $this->db->affected_rows() //影响的行数(update,insert) 更新
------- $data = array( 'name' => $name, 'email' => $email ); $where = id = 1; $this->db->update('tablename', $data); $this->db->update_string('tablename', $data, $where); 删除
------- $array = array( 'name' => $name, 'title' => $title ); $this->db->delete('tablename', $array); // produces: // delete from tablename where name = '$name' and title = '$title' $this->db->truncate('tablename'); //清空表 // produce: truncate tablename （where）
------- $array = array( 'name' => $name, 'title' => $title ); $this->db->where($array); // produces: where name = '$name' and title = '$title' ----------------------------------------------------- $this->db->count_all('tablename'); //表中记录总行数 ----------------------------------------------------- $query->free_result() //释放资源
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