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POHow to fix unresolved external symbol due to MySql Connector C++?
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I followed this tutorial <a href="http://blog.ulf-wendel.de/?p=215#hello" rel="noreferrer">http://blog.ulf-wendel.de/?p=215#hello</a>. I tried both on Visual C++ 2008 and Visual C++ 2010. Either static or dynamic, the compiler gave me the same exact error messages: <pre><code>error LNK2001: unresolved external symbol _get_driver_instance </code></pre> Has anyone experience this issue before? Update: + Additional Dependencies: mysqlcppconn.lib + Additional Include Directories: C:\Program Files\MySQL\MySQL Connector C++ 1.0.5\include + Additional Libraries Directories: C:\Program Files\MySQL\MySQL Connector C++ 1.0.5\lib\opt Another Update: Click F12 on get_driver_instance() linked to: <pre><code>class CPPCONN_PUBLIC_FUNC Driver { protected: virtual ~Driver() {} public: // Attempts to make a database connection to the given URL. virtual Connection * connect(const std::string& hostName, const std::string& userName, const std::string& password) = 0; virtual Connection * connect(std::map< std::string, ConnectPropertyVal > & options) = 0; virtual int getMajorVersion() = 0; virtual int getMinorVersion() = 0; virtual int getPatchVersion() = 0; virtual const std::string & getName() = 0; }; } /* namespace sql */ extern "C" { CPPCONN_PUBLIC_FUNC sql::Driver *get_driver_instance(); } </code></pre> Apparently, the function existed, but the linker could not find it. Code snippet: <pre><code>#include <iostream> #include <sstream> #include <memory> #include <string> #include <stdexcept> using namespace std; #include "mysql_connection.h" #include "mysql_driver.h" #include <cppconn/driver.h> #include <cppconn/exception.h> #include <cppconn/resultset.h> #include <cppconn/statement.h> int main() { try { sql::Driver *driver; sql::Connection *conn; sql::Statement *stmt; sql::ResultSet *res; driver = get_driver_instance(); conn = driver->connect( "http://localhost/chandb", "root", "chan" ); stmt = conn->createStatement(); res = stmt->executeQuery( "select * from another" ); while( res->next() ) { cout << "id = " << res->getInt( "Id" ); cout << "id = " << res->getInt( "GoldValue" ); cout << "id = " << res->getString( "Model" ); } delete conn; delete stmt; delete res; std::cout << "This is it"; } catch( sql::SQLException e ) { cout << e.what(); } } </code></pre> Thanks, Chan
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How to fix unresolved external symbol due to MySql Connector C++?
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