 | | | Query object seg. faults on destruction...(ignore earlier posts please) | Query object seg. faults on destruction...(ignore earlier posts please) 2007-11-25 - By Graham Reitz
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With the code (below) the Query object segmentation faults on its
destructor call. Any help would be greatly appreciated. I am quite
stuck. The same code appears to compile and run and a Windows XP
machine using VS2005. I am pretty sure it worked on Mac OS X 10.4.x
(Tiger) but not certain.
kindly,
graham
OS:
Mac OS X 10.5.1 (Leopard)
Linker flags :
-lz /usr/local/mysql/lib/mysql/libmysqlclient_r.a -lmysqlpp
Other notes:
mysql_client was built from scratch, although I get the same error
with the prebuilt libraries.
Output:
Attempting to connect to the database...connected to the database
Query created: select client_id from clients where client_user_name
='tacadmin' and client_password ='tacadmin123'
Segmentation fault
Backtrace:
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0xfffffffc
0x92b7f6e1 in __gnu_cxx::__exchange_and_add ()
(gdb) backtrace
#0 0x92b7f6e1 in __gnu_cxx::__exchange_and_add ()
#1 0x92b6f070 in std::string::_Rep::_M_dispose ()
#2 0x92b704ab in std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::~basic_string ()
#3 0x00002ca8 in std::basic_stringbuf<char, std::char_traits<char>,
std::allocator<char> >::~basic_stringbuf (this=0xbffff794) at iosfwd:71
#4 0x00002d13 in std::basic_stringbuf<char, std::char_traits<char>,
std::allocator<char> >::~basic_stringbuf (this=0xbffff794) at iosfwd:71
#5 0x00004351 in mysqlpp::Query::~Query (this=0xbffff6f8) at query.h:
131
#6 0x00001c2f in main (argc=1, argv=0xbffff8d4) at /Users/grahamreitz/
Development/mysqlpp_test/main.cpp:54
Code:
#include <iostream>
#include <string>
#include <mysql++.h>
using namespace std;
using namespace mysqlpp;
int main (int argc, char * const argv[])
{
string database_name = "db_rev_4";
string ip_address = "x.x.x.x";
string username = "username";
string password = "password";
string error_msg;
try
{
Result client_id_result;
cout << "Attempting to connect to the database...";
Connection m_connection(database_name.c_str(),
ip_address.c_str(),
username.c_str(),
password.c_str(),
3306,
false,
15);
cout << "connected to the database" << endl;
Query client_id_query = m_connection.query();
client_id_query <<
"select client_id from clients where client_user_name ="
<< quote_only << username << " and client_password ="
<< quote_only << password;
cout << "Query created: ";
cout << client_id_query.preview() << endl;
m_connection.close();
}
catch (exception &e)
{
cout << "exception occurred..." << endl;
error_msg = e.what();
cout << error_msg;
}
catch (...)
{
error_msg = "Unknown exception";
cout << error_msg << endl;
}
return 0;
}
Also if the Query code is commented out the output is as follows. It
goes away if I comment out the Result object.
Attempting to connect to the database...connected to the database
mysqlpp_test(7767) malloc: *** error for object 0x18a198: Non-aligned
pointer being freed
*** set a breakpoint in malloc_error_break to debug
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