C/C++使用MySQL

　　一直找不到关于C/C++连接Mysql数据库的详细api书籍和网站，刷了下网页，找到一篇Linux 下C/C++连接数据库的博客，留着以后自己用。

　　首先需要编译、安装MySQL，安装完成后，将MySQL目录中的lib目录添加到环境变量中。新建C/C  工程，把$MYSQL_ROOT/include添加到编译环境的包含路径下面。在编译选项中，增加$MYSQL_ROOT/lib目录。在Link选项中增加-lmysqlclient（已经把lib目录增加到系统环境变量中），或者直接引用libmysqlclient.so文件。

不多说了，直接上代码，注释都很详细。
/*    
* MySQLManager.h    
*    
*    Created on: Feb 18, 2009    
*            Author: Steven Wee    
*/    

#ifndef MYSQLMANAGER_H_    
#define MYSQLMANAGER_H_    

#include "../Common/CheckStringTools.h"    

#include < mysql.h>    

#include < string>    
#include < iostream>    
#include < vector>    

#include < string.h>    

using namespace std;    

class MySQLManager    
{    
public:    
        /*    
         * Init MySQL    
         * @param hosts:         Host IP address    

         * @param userName:        Login UserName    
         * @param password:        Login Password    
         * @param dbName:        Database Name    
         * @param port:                Host listen port number    
         */    
        MySQLManager(std::string hosts, std::string userName, std::string password, std::string dbName, unsigned int port);    
        ~MySQLManager();    
        void initConnection();    
        /*    
         * Making query from database    
         * @param mysql:        MySQL Object    
         * @param sql:                Running SQL command    
         */    
        bool runSQLCommand(std::string sql);    
        /**    
         * Destroy MySQL object    
         * @param mysql                MySQL object    
         */    
        void destroyConnection();    
        bool getConnectionStatus();    
        vector<  vector< string> > getResult();    
protected:    
        void setUserName(std::string userName);    
        void setHosts(std::string hosts);    
        void setPassword(std::string password);    
        void setDBName(std::string dbName);    
        void setPort(unsigned int port);    
private:    
        bool IsConnected;    
        vector<  vector< string> > resultList;    
        MYSQL mySQLClient;    
        unsigned int DEFAULTPORT;    
        char * HOSTS;    
        char * USERNAME;    
        char * PASSWORD;    
        char * DBNAME;    
};    

#endif /* MYSQLMANAGER_H_ */ 

/*    
* MySQLManager.cpp    
*    
*    Created on: Feb 18, 2009    
*            Author: Steven Wee    
*/    
#include "MySQLManager.h"    

MySQLManager::MySQLManager(string hosts, string userName, string password, string dbName, unsigned int port)    

{    
        IsConnected = false;    
        this ->setHosts(hosts);            //    设置主机IP地址    
        this ->setUserName(userName);            //    设置登录用户名    
        this ->setPassword(password);            //    设置登录密码    
        this ->setDBName(dbName);            //    设置数据库名    
        this ->setPort(port);            //    设置端口号    
}    

MySQLManager::~MySQLManager()    
{    
        this ->destroyConnection();    
}    

void MySQLManager::setDBName(string dbName)    
{    
        if ( dbName.empty() )    
        {//        用户没有指定数据库名    
                std::cout < <  "DBName is null! Used default value: mysql" < <  std::endl;    
                this ->DBNAME = new char[5];    
                strcpy(this ->DBNAME, "mysql");    
        }    
        else    
        {    
                this ->DBNAME = new char[dbName.length()];    
                strcpy(this ->DBNAME, dbName.c_str());    
        }    
}    

void MySQLManager::setHosts(string hosts)    
{    
        if ( hosts.empty() )    
        {//    用户没有指定数据库IP地址    
                std::cout < <  "Hosts is null! Used default value: localhost" < <  std::endl;    
                this ->HOSTS = new char[9];    
                strcpy(this ->HOSTS, "localhost");    
        }    
        else    
        {    
                this ->HOSTS = new char[hosts.length()];    
                strcpy(this ->HOSTS, hosts.c_str());    
        }    
}    

void MySQLManager::setPassword(string password)    
{//    用户没有指定密码    
        if ( password.empty() )    
        {    

                std::cout < <  "Password is null! Used default value: " < <  std::endl;    
                this ->PASSWORD = new char[1];    
                strcpy(this ->PASSWORD, "");    
        }    
        else    
        {    
                this ->PASSWORD = new char[password.length()];    
                strcpy(this ->PASSWORD, password.c_str());    
        }    
}    

void MySQLManager::setPort(unsigned int port)    
{//    用户没有指定端口号，使用默认端口号    
        if ( port )    
        {    
                std::cout < <  "Port number is null! Used default value: 0" < <  std::endl;    
                this ->DEFAULTPORT = 0;    
        }    
        else    
        {    
                this ->DEFAULTPORT = port;    
        }    
}    

void MySQLManager::setUserName(string userName)    
{//    用户没有指定登录用户名    
        if ( userName.empty() )    
        {    
                std::cout < <  "UserName is null! Used default value: root" < <  std::endl;    
                this ->USERNAME = new char[4];    
                strcpy(this ->USERNAME, "root");    
        }    
        else    
        {    
                this ->USERNAME = new char[userName.length()];    
                strcpy(this ->USERNAME, userName.c_str());    
        }    
}    

void MySQLManager::initConnection()    
{    
        if ( IsConnected )    
        {//    已经连接到服务器    
                std::cout < <  "Is connected to server!" < < std::endl;    
                return;    
        }    
        mysql_init(&mySQLClient);//    初始化相关对象    
        if ( !mysql_real_connect( &mySQLClient, HOSTS, USERNAME, PASSWORD, DBNAME, DEFAULTPORT, NULL, 0) )    

        {//    连接到服务器    
                std::cout < <  "Error connection to database: %s
" < <  mysql_error(&mySQLClient) < <  std::endl;    
        }    
        IsConnected = true;//    修改连接标识    
}    

bool MySQLManager::runSQLCommand(string sql)    
{    
        if ( !IsConnected )    
        {//    没有连接到服务器    
                std::cout < <  "Not connect to database!" < <  std::endl;    
                return false;    
        }    
        if ( sql.empty() )    
        {//    SQL语句为空    
                std::cout < <  "SQL is null!" < <  std::endl;    
                return false;    
        }    

        MYSQL_RES *res;    
        MYSQL_ROW row;    

        unsigned int i,j = 0;    

        StringTools stringTools;    
        sql = stringTools.filterString(sql);    

        i = mysql_real_query(&mySQLClient,sql.c_str(),(unsigned int)strlen(sql.c_str()));//    执行查询    
        if ( i )    
        {    
                std::cout < <  "Error query from database: %s
" < <  mysql_error(&mySQLClient) < <  std::endl;    
                return false;    
        }    
        res = mysql_store_result(&mySQLClient);    
        vector< string> objectValue;    
        while( (row = mysql_fetch_row(res)) )    
        {//    遍历结果集    
                objectValue.clear();    
                for ( j = 0 ; j <  mysql_num_fields(res) ; j   )    
                {    
                        objectValue.push_back(row[j]);    
                }    
                this ->resultList.push_back(objectValue);    
        }    
        mysql_free_result(res);         //free result after you get the result    



        return true;    
}    

vector<  vector< string> > MySQLManager::getResult()    
{    
        return resultList;    
}    

void MySQLManager::destroyConnection()    
{    
        mysql_close(&mySQLClient);    
        this ->IsConnected = false;    
}    

bool MySQLManager::getConnectionStatus()    
{    
        return IsConnected;    
} 

来自：http://club.topsage.com/forum.php?mod=viewthread&tid=2129419