【发布时间】：2016-12-30 16:55:32
【问题描述】：
这个问题的变体以前已经被问过很多次了，但是我搜索了我在网上可以找到的所有内容，但仍然没有有效的答案，或者至少没有一个有效的答案。
我正在尝试设置 Code::Blocks 以使用 MySql 连接器，以便让发布的教程 here 运行。据我所知，我已经做了所有事情，但在编译时仍然出现“未定义的引用”错误。我相当肯定这是一个链接错误。
这是我在编译时遇到的错误：
obj\Release\main.o:main.cpp:(.text.startup+0x15e)
undefined reference to _imp__get_driver_instance' error: ld returned 1 exit status
这是我的设置：
操作系统：Windows 7 64 位
IDE: Code::Blocks 16.01
设置->编译器->搜索目录->编译器：
C:\Program Files\MySQL\MySQL Connector C++ 1.1.7\include
C:\Program Files\MySQL\MySQL Connector C++ 1.1.7\include\cppconn
C:\local\boost_1_61_0
设置->编译器->搜索目录->链接器：
C:\Program Files\MySQL\MySQL Connector C++ 1.1.7\lib\opt
设置->编译器->链接器设置->链接库：
C:\Program Files\MySQL\MySQL Connector C++ 1.1.7\lib\opt\mysqlcppconn.lib
C:\Program Files\MySQL\MySQL Connector C++ 1.1.7\lib\opt\mysqlcppconn-static.lib
就像我说的那样，网络上有很多关于这个特定错误的问题，但我没有找到任何适合我的设置的解决方案。我承认我对链接库有点生疏，但我发誓我已经尝试了所有可能的变体，但都没有成功。
代码如下：
/* Standard C++ headers */
#include <iostream>
#include <sstream>
#include <memory>
#include <string>
#include <stdexcept>
#include <stdlib.h>
/* MySQL Connector/C++ specific headers */
#include <driver.h>
#include <connection.h>
#include <statement.h>
#include <prepared_statement.h>
#include <resultset.h>
#include <metadata.h>
#include <resultset_metadata.h>
#include <exception.h>
#include <warning.h>
#define DBHOST "removed"
#define USER "removed"
#define PASSWORD "removed"
#define DATABASE "removed"
#define NUMOFFSET 1
#define COLNAME 1
using namespace std;
using namespace sql;
static void retrieve_data_and_print (ResultSet *rs, int type, int colidx, string colname) {
/* retrieve the row count in the result set */
cout << "\nRetrieved " << rs -> rowsCount() << " row(s)." << endl;
cout << "\nTestColumnName" << endl;
cout << "--------" << endl;
/* fetch the data : retrieve all the rows in the result set */
while (rs->next()) {
if (type == NUMOFFSET) {
cout << rs -> getString(colidx) << endl;
} else if (type == COLNAME) {
cout << rs -> getString(colname) << endl;
} // if-else
} // while
cout << endl;
}
int main(int argc, const char *argv[]) {
Driver *driver;
Connection *con;
Statement *stmt;
ResultSet *res;
PreparedStatement *prep_stmt;
Savepoint *savept;
int updatecount = 0;
/* initiate url, user, password and database variables */
string url(argc >= 2 ? argv[1] : DBHOST);
const string user(argc >= 3 ? argv[2] : USER);
const string password(argc >= 4 ? argv[3] : PASSWORD);
const string database(argc >= 5 ? argv[4] : DATABASE);
try {
driver = get_driver_instance();
/* create a database connection using the Driver */
con = driver -> connect(url, user, password);
/* turn off autocommit */
con -> setAutoCommit(0);
cout << "Database connection\'s autocommit mode = " << con -> getAutoCommit() << endl;
// select database schema
con -> setSchema(database);
// create a statement object
stmt = con -> createStatement();
cout << "Executing Query: \"SELECT * FROM organizations\" ... " << endl;
/* run query */
res = stmt -> executeQuery ("SELECT * FROM organizations");
cout << "Retrieving the result set ..." << endl;
retrieve_data_and_print (res, NUMOFFSET, 1, string("TestColumnName"));
} catch (SQLException &e) {
cout << "ERROR: SQLException in " << __FILE__;
cout << " (" << __func__<< ") on line " << __LINE__ << endl;
cout << "ERROR: " << e.what();
cout << " (MySQL error code: " << e.getErrorCode();
cout << ", SQLState: " << e.getSQLState() << ")" << endl;
if (e.getErrorCode() == 1047) {
/*
Error: 1047 SQLSTATE: 08S01 (ER_UNKNOWN_COM_ERROR)
Message: Unknown command
*/
cout << "\nYour server does not seem to support Prepared Statements at all. ";
cout << "Perhaps MYSQL < 4.1?" << endl;
}
return EXIT_FAILURE;
} catch (std::runtime_error &e) {
cout << "ERROR: runtime_error in " << __FILE__;
cout << " (" << __func__ << ") on line " << __LINE__ << endl;
cout << "ERROR: " << e.what() << endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
【问题讨论】：
标签： c++ mysql windows-7 codeblocks