MySQL的Connector C++

MySQL提供了C++语言的操作接口，用这个接口可以针对自己的数据库写一个C++的客户端出来，安装的方法请参看官方文档。

这个文章已经把在Visual Studio 2008里如何编写MySQL Connector C++的应用程序进行了详细的说明，此方法是针对MySQL Connector C++的安装包来介绍的。而另一篇文章则介绍了如何从MySQL Connector C++的源码包编译。

这里介绍一下Visual Studio 2005下面，用安装二进制包的方法来使用MySQL Connector C++的方法：

先安装MySQL

记得要把Developer Components – C Include Files / Lib Files选上。当然，你不安装MySQL而只装这个单独的包也行，不过我还是建议在本地装一个MySQL，否则怎么测试呢？远程测试太麻烦了～～

下载与Visual Studio 2005相对应的MySQL Connector C++版本
在Visual Studio 2005里创建一个Win32 Console工程

File->New Project->Visual C++->Win32->Win32 Console Application

注意：”Application Settings”里的”Additional options: Precompiled header”默认是会被选上的，而我们这里，基本上可以不用这个。

正确地配置工程属性

不管是Debug还是Release，都是用下面的方法设置就可以了，主要是把相关的头文件include到工程，再指定相关的动态链接库所在路径。

(1) 打开”project”->”properties”对话框，选择”configuration properties”

把MySQL Connector/C++的安装目录添加到Additional Include Directory里：

Project->Properties
Configuration Properties -> open tree view
C/C++ -> General -> Additional Include Directory

(2) 让编译器能找到MySQL Connector/C++的libraries，只要把MySQL Connector/C++安装目录里的lib/opt目录添加到搜索路径即可：

Linker -> General -> Additional Library Directories

(3) 编译器在编译的时候，让linker去链接MySQL Connector/C++的mysqlcppconn.lib库

把mysqlcppconn.lib添加到这里：

Linker -> Input -> Additional Dependencies

可以试着编译下面的这段最基本的代码：

/*
examples/standalone_example_docs1.cpp
*/

/* Standard C++ includes */
#include

#include


/*
Include directly the different
headers from cppconn/ and mysql_driver.h + mysql_util.h
(and mysql_connection.h). This will reduce your build time!
*/
#include "mysql_connection.h"

#include "cppconn/driver.h"
#include "cppconn/exception.h"
#include "cppconn/resultset.h"
#include "cppconn/statement.h"

using namespace std;

int main(void)
{
    cout << endl;
    cout << "Running 'SELECT 'Hello World!' AS _message'..." << endl;

    try {
        sql::Driver *driver;
        sql::Connection *con;
        sql::Statement *stmt;
        sql::ResultSet *res;

        /* Create a connection */
        driver = get_driver_instance();
        con = driver->connect("tcp://127.0.0.1:3306", "root", "password");
        /* Connect to the MySQL test database */
        con->setSchema("test");

        stmt = con->createStatement();
        res = stmt->executeQuery("SELECT 'Hello World!' AS _message");
        while (res->next()) {
            cout << "\t... MySQL replies: ";
            /* Access column data by alias or column name */
            cout << res->getString("_message") << endl;
            cout << "\t... MySQL says it again: ";
            /* Access column fata by numeric offset, 1 is the first column */
            cout << res->getString(1) << endl;
        }
        delete res;
        delete stmt;
        delete con;

    } catch (sql::SQLException &e) {
        cout << "# ERR: SQLException in " << __FILE__;
        cout << "(" << __FUNCTION__ << ") on line " << __LINE__ << endl;
        cout << "# ERR: " << e.what();
        cout << " (MySQL error code: " << e.getErrorCode();
        cout << ", SQLState: " << e.getSQLState() << " )" << endl;
    }

    cout << endl;

    return EXIT_SUCCESS;
}

如果一切顺序，应该就能连上本地的MySQL进行操作了。

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