linux mysql api c/c++

/*
vim /etc/vimrc--始具体情况而定
vim 显示行号、c语言高亮、自动缩进等
set nu
set cindent
set autoindent
syntax on

编译前提：
环境：os RH5_x86_64，mysql5
使用rpm包安装好了mysql，如果其他环境请自行设置编译命令；
编译命令：
 g++ $(mysql_config --cflags) $(mysql_config --libs)  mysql.c

mysql官方帮助文档：
http://dev.mysql.com/doc/refman/5.1/en/c-api-functions.html

*/

#include <iostream>
#include "mysql.h"
//pragma comment
using namespace std;

void use_mysql_query(char* const);

int main()
{
	cout<<"---------- 下面开始连接mysql数据库，看仔细了----------"<<endl;
	use_mysql_query("select * from mysql.user");
}

void use_mysql_query(char* const str)
{
	MYSQL *mysql=mysql_init(0);
	mysql=mysql_real_connect(mysql,"localhost","root","","mysql",3306,0,0);	
	int nResult=mysql_query(mysql,str);
	cout<<"查询的返回01: "<<nResult<<endl;
	
	if(nResult!=0)
	{
		cout<<"查询数据库出错!"<<endl;
		exit(1);
	}
	MYSQL_RES *res=mysql_use_result(mysql);

	MYSQL_FIELD *field;
	
	int field_count=res->field_count;
	while((field=mysql_fetch_field(res))!=NULL)
	{
		cout<<"字段："<<field->name<<"介绍开始------------;"<<endl;
		cout<<"名称："<<field->name<<endl;
		cout<<"长度："<<field->length<<endl;
		cout<<"类型："<<field->type<<endl;
		cout<<"字段："<<field->name<<"介绍结束------------;"<<endl;
		cout<<""<<endl;
	}

	MYSQL_ROW row;
	
	while((row=mysql_fetch_row(res))!=NULL)
	{	
		cout<<"============"<<endl;
		for(int i=0;i<field_count;i++)
		{
			cout<<row[i]<<"---------";
		}
	}
	cout<<"开始释放资源，关闭数据库连接-----"<<endl;

	mysql_free_result(res);
   	mysql_close(mysql);

}