C++读mysql数据表，遍历结果集然后返回Domain对象的list，一万条记录竟然需要3秒多，应该怎样优化？

Question

这个函数要完成的任务是：
利用mysqlpp查询出结果集，然后遍历每一行记录，生成一个Domain对象，放到list中，最后返回一个Domain对象的list。
在做测试的时候，发现遍历一万条数据竟然需要3秒多……所以请大家帮忙把把脉，看应该如何优化：

完整的while循环，计时：3.338秒
注释掉第10行，计时：1.174秒
注释掉7-11行，计时：1.193秒

代码：

1. Connection* conn = ConnPool::getSingletonPtr()->getConn();
2. Query qr = conn->query(sql);
3. UseResult res = qr.use();

​// 开始计时
4. while(Row row = res.fetch_row()) // 循环10000条记录
5. {
6. Domain obj;
7. for(int i=0; i<row.size(); i++)
8. {
9. // 调用Domain的成员函数，为Domain对象赋值
10. obj.setValue(res.fetch_field(i).name(), row[i]);
11. }
12. objList->push_back(obj);
13.}
// 结束计时

Domain类中定义这么一堆属性：

int procedureNo;
int index;
int employeeNo;
int procCount;
int state;
int procPermission;
int procDeadline;
int advanceAlert;
DateTime procTime; 
int resultFlag;
string comment; 
int flowDirection;
int isHideComment;
int isTrack;
DateTime arriveTime; 
string preNodesJsonStr; 
string nextNodesJsonStr; 
string attachStr; 
string employeeName; 
DateTime employeeBirthDay;

上面第10行用到的成员函数定义如下（之所以用这个函数，是因为数据表中的字段名和Domain类的属性名并不一致）

void Domain::setValue(const char * colName, const Element& ele) 
{ 
if(strcmp(colName,"column010") == 0) 
procedureNo = ele; 
else if(strcmp(colName,"column020") == 0) 
index = ele; 
else if(strcmp(colName,"column030") == 0) 
employeeNo = ele; 
else if(strcmp(colName,"column040") == 0) 
procCount = ele; 
else if(strcmp(colName,"column050") == 0) 
state = ele; 
else if(strcmp(colName,"column060") == 0) 
procPermission = ele; 
else if(strcmp(colName,"column070") == 0) 
procDeadline = ele; 
else if(strcmp(colName,"column080") == 0) 
advanceAlert = ele; 
else if(strcmp(colName,"column090") == 0) 
procTime = ele; 
else if(strcmp(colName,"column100") == 0) 
resultFlag = ele; 
else if(strcmp(colName,"column110") == 0) 
comment = ele; 
else if(strcmp(colName,"column120") == 0) 
flowDirection = ele; 
else if(strcmp(colName,"column130") == 0) 
isHideComment = ele; 
else if(strcmp(colName,"column140") == 0) 
isTrack = ele; 
else if(strcmp(colName,"column150") == 0) 
arriveTime = ele; 
else if(strcmp(colName,"column160") == 0) 
preNodesJsonStr = ele; 
else if(strcmp(colName,"column170") == 0) 
nextNodesJsonStr = ele; 
else if(strcmp(colName,"column180") == 0) 
attachStr = ele; 
else if(strcmp(colName,"column190") == 0) 
employeeName = ele; 
else if(strcmp(colName,"column200") == 0) 
employeeBirthDay = ele;
}

Answer 1

判断太多了，去掉for循环，直接按查询中读取到的字段顺序给对象赋值，这样效率会有不少提高

Answer 2

慢的是各种循环 不是查询

Answer 3

obj.procedureNo = row["column010"];
obj.index = row["column020"];
obj.employeeNo = row["column030"];
obj.procCount = row["column040"];
obj.state = row["column050"];
obj.procPermission = row["column060"];
obj.procDeadline = row["column070"];
obj.advanceAlert = row["column080"];
obj.procTime = row["column090"];
obj.resultFlag = row["column100"];
obj.comment = row["column110"];
obj.flowDirection = row["column120"];
obj.isHideComment = row["column130"];
obj.isTrack = row["column140"];
obj.arriveTime = row["column150"];
obj.preNodesJsonStr = row["column160"];
obj.nextNodesJsonStr = row["column170"];
obj.attachStr = row["column180"];
obj.employeeName = row["column190"];
obj.employeeBirthDay = row["column200"];