linux下使用c++语言对mysql数据库操作

#include "DBAccess.h"
#include <iostream>

//using namespace std;
DBAccess::DBAccess()
{
}
DBAccess::~DBAccess()
{

}
bool DBAccess::MysqlConnect()
{
mysql_init(&mysql);
if(mysql_real_connect(&mysql,"localhost","root","123456","DBTroFish",3306,NULL,0))//参数：主机localhost，用户名root，密码root，数据库DBTroFish
{
return true;
}
else
{
return false;
}
}
bool DBAccess::ExecuteSQL(std::string sql)//对数据的增删改操作
{
if(!MysqlConnect())
{
cout<<"连接失败！"<<mysql_error(&mysql)<<endl;//做测试用的
mysql_close(&mysql);//有效解决too many connection
return false;
//exit(1);//整个程序退出
}
if(mysql_query(&mysql,sql.c_str()))//返回值：0表示正常，非0表示发生了错误
{
cout<<"此操作有误！"<<mysql_error(&mysql)<<endl;
mysql_close(&mysql);
return false;
}
if(mysql_affected_rows(&mysql)>0)//返回值：>0表示影响的行数，=0表示无结果，=-1表示错误
{
mysql_close(&mysql);
return true;
}
else
{
mysql_close(&mysql);
return false;
}
}
MYSQL_RES* DBAccess::GetDataSet(std::string sql)//多行数据查询操作
{
MysqlConnect();
if(mysql_query(&mysql,sql.c_str()))
{
cout<<"此查询有误! 错误号为:"<<mysql_errno(&mysql)<<" 原因:"<<mysql_error(&mysql)<<endl;
}
result=mysql_store_result(&mysql);
mysql_close(&mysql);
//mysql_free_result(result);//要在使用后才调用此方法，不然内存会不断增长直至程序结束
return result;
}
MYSQL_ROW DBAccess::GetRow(std::string sql)//单行数据查询操作
{
result=GetDataSet(sql);
if(mysql_num_rows(result))
{
row=mysql_fetch_row(result);
mysql_free_result(result);//解决内存不断增长问题
return row;
}
else
{
return NULL;
}
}
string DBAccess::IntToString(int a)
{
char t[20];
sprintf(t,"%d",a);
return t;
}

#include <iostream>
#include <string.h>
#include <stdio.h>
#include <iostream>
#include <mysql/mysql.h>
#include "DBAccess.h"

#include <stdlib.h>
using namespace std;
int main()
{
if (1)
{
DBAccess myDBAccess;
string sql;
sql
= "insert into tblCoinDetail(CoinTime,Bet,BeginCredit,dEndCredit,GiftFlag)values('2011-02-42 1:1:1','1',5041,115,1)";
if (myDBAccess.ExecuteSQL(sql))
cout << "操作成功" << endl;
else
cout << "操作失败" << endl;
}
else
{
DBAccess myDBAccess;
MYSQL_ROW row;
string
sql =
"select date(CoinTime),sum(BeginCredit),sum(EndCredit),sum(BeginCredit-EndCredit) from tblCoinDetail group by CoinTime";
MYSQL_RES *result;
result = myDBAccess.GetDataSet(sql);
if(result!=NULL)// if (mysql_num_rows(result))//判断是否为空
{
while ((row = mysql_fetch_row(result)))
{
if(row[0]==NULL)//解决空地址问题
{
row[0]=(char*)"2011-01-01";
}
if(row[2]==NULL)
{
row[2]=(char*)"0";
}
fprintf(stdout, "%s|/t%s|/t%s|/t%s/n", row[0], row[1],row[2], row[3]);
}
} }
}