codeigniter DB类(收集)
链接数据库-------$this->load->database();//手动连接数据库//连接多数据库$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