[英]Crash using a class using mysql lib with wxWidgets
I've been stuck for a while on a problem and can't find a good solution. 我已经在一个问题上停留了一段时间,找不到一个好的解决方案。
I wrote a small class to use the c mysql lib on my project. 我写了一个小类在项目中使用c mysql lib。
I use this class from an other class, the compilation goes well, but when i call it the software crash. 我从另一个班级使用了这个班级,编译进行得很好,但是当我称它为软件崩溃时。
I believe that i'm doing something wrong but I can't find what. 我相信我做错了什么,但我找不到。 Maybe some advanced ppl will know.
也许某些高级的ppl会知道。
Sql class: SQL类:
class MySQL
{
public:
MySQL();
~MySQL();
bool Query(wxString Qu, MYSQL_RES * result);
unsigned int Insert(wxString Table);
bool Update(wxString Table, unsigned int Id, wxString Data);
bool Delete(wxString Table, unsigned int Id);
protected:
private:
void Close(void);
bool Open(void);
MYSQL mysql;
};
Sql function: SQL函数:
bool MySQL::Query(wxString Qu, MYSQL_RES * result)
{
//Qu.mb_str()
if (this->Open()) {
if (!mysql_query(&mysql, "jkjl")) { //<--- I've replaced the Qu var to be sure it wasn't the reason.
if ((result = mysql_store_result(&mysql))) {
this->Close();
}
else {
//throw wxString::Format(wxT("Error: %i, %s"), mysql_errno(&mysql), mysql_error(&mysql));
this->Close();
}
}
else {
//throw wxString::Format(wxT("Error: %i, %s"), mysql_errno(&mysql), mysql_error(&mysql));
this->Close();
}
}
return true;
}
My other class to access to: 我的其他班级获得:
bool cldataproject::Load(std::list<cldataproject*> list_dataproject)
{
MySQL sql;
MYSQL_RES *result = NULL;
MYSQL_ROW row = NULL;
unsigned int pos;
cldataproject * list_project;
wxString req;
req = wxT("SELECT idproject, idclient, name, comment, created_by, created_at, modified_by, modified_at FROM project WHERE isdel=0 ORDER BY name ASC;");
if ((sql.Query(req, result))) // <--- Crash
{
......
Open function: 打开功能:
bool MySQL::Open(void)
{
mysql_init(&mysql);
mysql_options(&mysql,MYSQL_READ_DEFAULT_GROUP,"option");
if(mysql_real_connect(&mysql,MYSQL_HOST,MYSQL_LOGIN,MYSQL_PASS,MYSQL_BASE,0,NULL,0))
{
return true;
}
else {
return false;
}
}
Note: Outside the class, on my main window (wxwidgets) this is working without any problem: 注意:在课外,在我的主窗口(wxwidgets)上,它没有任何问题:
str = wxT("SELECT idclient, name, created_by, created_at, modified_by, modified_at FROM client WHERE isdel=0 ORDER BY name ASC;");
mysql_query(&mysql, str.mb_str());
result = mysql_store_result(&mysql);
Update 更新资料
The goal of the class was to simply use it from the wxWidgets parts without taking care of the convertion. 该类的目标是简单地从wxWidgets部分使用它,而无需进行转换。
I have tried to separate but it doesn't seem that the problem is coming from the wxString
. 我试图分开,但是似乎问题出在
wxString
。
Something really strange I haven't been able to understand is that if I call: 我无法理解的真正奇怪的是,如果我打电话:
MySQL sql;
sql.Query(wxT("blabla"), NULL)
from the constructor of my wxFrame
it doesn't crash. 从我的
wxFrame
的构造函数不会崩溃。 If I do the same on a function on the wxFrame
class, itself called from its constructor, it crashes. 如果我对
wxFrame
类的一个函数(从其构造函数本身调用)执行相同的操作,则会崩溃。
like: 喜欢:
constructor {
Query
}
Ok 好
constructor {
function()
}
fonction {
Query
}
Crash 崩溃
I'm really confused... 我真的很困惑
Why are you mixing wxStrings and MySQL? 为什么要混合wxStrings和MySQL? That doesn't seem like a good idea.
这似乎不是一个好主意。 I would highly suggest just using normal strings everywhere, and separate out the WxWidgets code and the MySQL code completely, so you can figure out what's going wrong properly.
我强烈建议仅在任何地方使用普通字符串,并将WxWidgets代码和MySQL代码完全分开,这样您就可以正确地找出问题所在。
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