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我有C++代碼來連接並用mysql:CPP-mysql的未定義的引用「的功能」錯誤
#include <iostream>
#include <mysql/mysql.h>
using namespace std;
MYSQL *connection, mysql;
MYSQL_RES *result;
MYSQL_ROW row;
int query_state;
int main() {
mysql_init(&mysql);
connection = mysql_real_connect(&mysql,"localhost","root","pass","cpp_data",0,0,0);
if (connection == NULL) {
cout << mysql_error(&mysql) << endl;
return 1;
}
return 0;
}
當我編譯,我得到test.cpp:(.text+0x11): undefined reference to 'mysql_init'
和mysql_real_connect
和mysql_error
同樣的錯誤。
我已經試過gcc -o test -L/usr/lib/mysql -lmysqlclient test.cpp
,但這給我以下錯誤:
test.cpp:(.text+0x7a): undefined reference to `std::cout'
test.cpp:(.text+0x7f): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
test.cpp:(.text+0x87): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' etc.
我檢查mysql.h
和mysql_real_connect
的定義是:
MYSQL * STDCALL mysql_real_connect(MYSQL *mysql, const char *host,
const char *user,
const char *passwd,
const char *db,
unsigned int port,
const char *unix_socket,
unsigned long clientflag);
我沒有問題,當我做不使用這些mysql函數。是否有另一個選擇來解決這個問題?
so g ++ -o test -L/usr/lib/mysql -lmysqlclient test.cpp實際上是解決這個問題的方法嗎? – 2012-01-15 13:02:53
對於未定義的符號,是的。 (儘管你應該在'test.cpp'後面加上'-lmysqlclient'作爲該行的結尾。) – Mat 2012-01-15 13:03:45